初学SpringBoot,只浅在的学了,所以内容比较简单,代码可能比较多,因为现在我注重于用还没有研究其底层,所以看完本文章每一章节理解后,能自己敲一遍,明白其流程,实现功能便可,文中若有纰漏望指出ψ(*`ー´)ψ

文章目录

  • 一、Spring Boot返回JSON
  • 二、Spring Boot的热部署
  • 三、Spring Boot资源文件属性配置
    • 1、资源文件中的属性配置与映射到实体类
    • 2、SpringBoot资源文件配置server
    • 3、资源文件中配置tomcat相关属性
  • 四、Spring Boot整合模板引擎
    • 1、SpringBoot整合freemarker
    • 2、SpringBoot整合thymeleaf
  • 五、Spring Boot配置全局的异常捕获
    • 1、页面跳转形式
    • 2、ajax形式
    • 3、统一返回异常的形式
  • 六、Spring Boot整合redis
  • 七、Spring Boot整合定时任务task
  • 八、springboot整合异步任务以及使用场景
  • 九、Spring Boot中如何使用拦截器
  • 十、Spring Boot整合MyBatis
    • 1、使用generatorConfig生成mapper以及pojo,实现反序列化操作
    • 2、实现基于mybatis的CRUD功能

相关文章:
Spring
MyBatis
SpringMVC
Spring Boot入门就是这么简单

一、Spring Boot返回JSON

SpringBoot返回字符串的方式也是有两种,一种是通过@ResponseBody 和@RequestMapping(value = “/request/data”, method = RequestMethod.POST, produces = “application/json;charset=UTF-8”) 中的produces = “application/json;charset=UTF-8” 来设定返回的数据类型是json,utf-8编码,第二种方式,是通过response的方式,直接写到客户端对象。在Springboot中,推荐使用注解的方式。

简单示例:
User.java(生成相应的get、set):

public class User {private String name;private String password;private Integer age;private Date birthday;private String desc;
}

未使用JSON时:
UserContoller.java:

//@Controller
@RestController         //@RestController  =  @Controller +  @ResponseBody
@RequestMapping("/User")
public class UserContoller {@RequestMapping("/getUser")
//    @ResponseBodypublic static User getUser() {User user = new User();user.setName("小宝贝~~~");user.setAge(520);user.setBirthday(new Date());user.setPassword("1314");user.setDesc(null);return user;}
}

运行后:

当是 JSON时:
IMoocJSONResult.java:

import java.util.List;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;/**** @Title: LeeJSONResult.java* @Package com.lee.utils* @Description: 自定义响应数据结构*               这个类是提供给门户,ios,安卓,微信商城用的*               门户接受此类数据后需要使用本类的方法转换成对于的数据类型格式(类,或者list)*              其他自行处理*                 200:表示成功*                500:表示错误,错误信息在msg字段中*                 501:bean验证错误,不管多少个错误都以map形式返回*                502:拦截器拦截到用户token出错*                 555:异常抛出信息* Copyright: Copyright (c) 2016* Company:Nathan.Lee.Salvatore*/
public class IMoocJSONResult {// 定义jackson对象private static final ObjectMapper MAPPER = new ObjectMapper();// 响应业务状态private Integer status;// 响应消息private String msg;// 响应中的数据private Object data;private String ok; // 不使用public static IMoocJSONResult build(Integer status, String msg, Object data) {return new IMoocJSONResult(status, msg, data);}public static IMoocJSONResult ok(Object data) {return new IMoocJSONResult(data);}public static IMoocJSONResult ok() {return new IMoocJSONResult(null);}public static IMoocJSONResult errorMsg(String msg) {return new IMoocJSONResult(500, msg, null);}public static IMoocJSONResult errorMap(Object data) {return new IMoocJSONResult(501, "error", data);}public static IMoocJSONResult errorTokenMsg(String msg) {return new IMoocJSONResult(502, msg, null);}public static IMoocJSONResult errorException(String msg) {return new IMoocJSONResult(555, msg, null);}public IMoocJSONResult() {}//    public static LeeJSONResult build(Integer status, String msg) {
//        return new LeeJSONResult(status, msg, null);
//    }public IMoocJSONResult(Integer status, String msg, Object data) {this.status = status;this.msg = msg;this.data = data;}public IMoocJSONResult(Object data) {this.status = 200;this.msg = "OK";this.data = data;}public Boolean isOK() {return this.status == 200;}public Integer getStatus() {return status;}public void setStatus(Integer status) {this.status = status;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public Object getData() {return data;}public void setData(Object data) {this.data = data;}/**** @Description: 将json结果集转化为LeeJSONResult对象*              需要转换的对象是一个类* @param jsonData* @param clazz* @return** @author leechenxiang* @date 2016年4月22日 下午8:34:58*/public static IMoocJSONResult formatToPojo(String jsonData, Class<?> clazz) {try {if (clazz == null) {return MAPPER.readValue(jsonData, IMoocJSONResult.class);}JsonNode jsonNode = MAPPER.readTree(jsonData);JsonNode data = jsonNode.get("data");Object obj = null;if (clazz != null) {if (data.isObject()) {obj = MAPPER.readValue(data.traverse(), clazz);} else if (data.isTextual()) {obj = MAPPER.readValue(data.asText(), clazz);}}return build(jsonNode.get("status").intValue(), jsonNode.get("msg").asText(), obj);} catch (Exception e) {return null;}}/**** @Description: 没有object对象的转化* @param json* @return** @author leechenxiang* @date 2016年4月22日 下午8:35:21*/public static IMoocJSONResult format(String json) {try {return MAPPER.readValue(json, IMoocJSONResult.class);} catch (Exception e) {e.printStackTrace();}return null;}/**** @Description: Object是集合转化*                 需要转换的对象是一个list*/public static IMoocJSONResult formatToList(String jsonData, Class<?> clazz) {try {JsonNode jsonNode = MAPPER.readTree(jsonData);JsonNode data = jsonNode.get("data");Object obj = null;if (data.isArray() && data.size() > 0) {obj = MAPPER.readValue(data.traverse(),MAPPER.getTypeFactory().constructCollectionType(List.class, clazz));}return build(jsonNode.get("status").intValue(), jsonNode.get("msg").asText(), obj);} catch (Exception e) {return null;}}public String getOk() {return ok;}public void setOk(String ok) {this.ok = ok;}
}

UserContoller.java:

    @RequestMapping("/getUserJson")
//  @ResponseBodypublic IMoocJSONResult getUserJson() {User u = new User();u.setName("小宝贝~~~");u.setAge(520);u.setBirthday(new Date());u.setPassword("1314");u.setDesc("cute baby");return IMoocJSONResult.ok(u);}

运行后:

是否发现些许不同,多了一些东西呢。

Jackson的基本演绎法
User.java(生成相应的get、set):

public class User {private String name;@JsonIgnore         //忽略显示private String password;private Integer age;//格式化时间,其中locale为zh,代表中国@JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss a", locale = "zh", timezone = "GMT+8")private Date birthday;@JsonInclude(JsonInclude.Include.NON_NULL)    //值为null不显示private String desc;
}

运行后:

二、Spring Boot的热部署

什么是热部署
所谓的热部署:比如项目的热部署,就是在应用程序在不停止的情况下,实现新的部署(或者说:每次修改代码就得将项目重启,重新部署,对于一些大型应用来说,重启需要花费大量的时间成本,而且重启的过程很不爽(•́へ•́╬))

springboot有五种热部署:

1、模板热部署
2、使用调试模式Debug实现热部署
3、Spring Loaded
4、JRebel
5、spring-boot-devtools(此篇主介绍这个)

简单介绍:
1、模板热部署
在 Spring Boot 中,模板引擎的页面默认是开启缓存的,如果修改了页面的内容,则刷新页面是得不到修改后的页面的,因此我们可以在application.properties中关闭模版引擎的缓存,如下:
Thymeleaf的配置:

spring.thymeleaf.cache=false

FreeMarker的配置:

spring.freemarker.cache=false

Groovy的配置:

spring.groovy.template.cache=false

Velocity的配置:

spring.velocity.cache=false

2、使用调试模式Debug实现热部署
此种方式为最简单最快速的一种热部署方式,运行系统时使用Debug模式,无需装任何插件即可,但是无发对配置文件,方法名称改变,增加类及方法进行热部署,使用范围有限。

3、Spring Loaded
此种方式与Debug模式类似,适用范围有限,但是不依赖于Debug模式启动,通过Spring Loaded库文件启动,即可在正常模式下进行实时热部署。此种需要在 run confrgration 中进行配置。

4、JRebel
Jrebel是Java开发最好的热部署工具,对 Spring Boot 提供了极佳的支持,JRebel为收费软件,试用期14天。,可直接通过插件安装。

5、spring-boot-devtools
在 Spring Boot 项目中添加 spring-boot-devtools依赖即可实现页面和代码的热部署。

实现原理:
spring-boot-devtools 是一个为开发者服务的一个模块,其中最重要的功能就是自动应用代码更改到最新的App上面去。原理是在发现代码有更改之后,重新启动应用,但是速度比手动停止后再启动还要更快,更快指的不是节省出来的手工操作的时间。
其深层原理是使用了两个ClassLoader,一个Classloader加载那些不会改变的类(第三方Jar包),另一个ClassLoader加载会更改的类,称为 restart ClassLoader ,这样在有代码更改的时候,原来的restart ClassLoader 被丢弃,重新创建一个restart ClassLoader,由于需要加载的类相比较少,所以实现了较快的重启时间(5秒以内)
pom.xml:

<!--热部署--><!--devtools可以实现页面热部署(即页面修改后会立即生效,这个可以直接在application.properties文件配置spring.thymeleaf.cache=false来实现)--><!--实现类文件热部署(类文件修改后不会立即生效),实现对属性文件的热部署--><!--即devtools会监听classpath下的文件变动,并且会立即重启应用(发生在保存时机),注意:因为其采用的虚拟机机制,该项重启是很快的--><!--(1)base calssloader (Base类加载器) : 加载不改变的Class, 例如:第三方提供的jar包--><!--(2)restart classloader(Restart类加载器):加载正在开发的Class--><!--为什么重启很快,因为重启的时候只加载了在开发的Class,没有重新加载第三方的jar包--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><!--optional=true,依赖不会传递,该项目依赖devtools;之后依赖boot项目的项目如果想要使用devtools,需要重新引入--><optional>true</optional></dependency>

application.properties:

#关闭缓存,即时刷新
#spring.freemarker.cache=false
spring.thymeleaf.cache=true
#热部署生效
spring.devtools.restart.enabled=true
#设置重启的目录,添加那个目录的文件需要restart
spring.devtools.restart.additional-paths=src/main/java
#为mybatis设置,生产环境可删除
#restart.include.mapper=/mapper-[\w-\.]+jar
#restart.include.pagehelper=/pagehelper-[\w-\.]+jar
#排除那个目录的文件不需要restart
#spring.devtools.restart.exclude=static/,public/
#classpath目录下的WEB-INF文件夹内容修改不重启
#spring.devtools.restart.exclude=WEB-INF/**

修改类–>保存:应用会重启
修改配置文件–>保存:应用会重启
修改页面–>保存:应用不会重启,但会重新加载,页面会刷新

其原理:

  1. devtools会监听classpath下的文件变动,并且会立即重启应用(发生在保存时机),注意:因为其采用的虚拟机机制,该项重启是很快的。
  2. devtools可以实现页面热部署(即页面修改后会立即生效,这个可以直接在application.properties文件中配置spring.thymeleaf.cache=false来实现(这里注意不同的模板配置不一样)

三、Spring Boot资源文件属性配置

1、资源文件中的属性配置与映射到实体类

首先先引入依赖:

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency>

通过属性配置,也可映射到实体类中
resource.properties:

com.baby.opensource.name=cute_baby
com.baby.opensource.website=www.love.com
com.baby.opensource.language=java

编写实体类Resource.java(get、set):

//加载注入properties文件,映射到实体类
@Configuration          //表示是会引用资源文件的类
@ConfigurationProperties(prefix="com.baby.opensource")     //指定资源文件的前缀
@PropertySource(value="classpath:resource.properties")      //指定资源文件的位置
public class Resource {private String name;private String website;private String language;
}

运行测试HelloContoller.java:

@RestController
public class HelloContoller {@Autowiredprivate Resource resource;@RequestMapping("/hello")public Object hello() {return "hello springboot~~";}@RequestMapping("/getResource")public IMoocJSONResult getResource() {Resource bean = new Resource();BeanUtils.copyProperties(resource, bean);return IMoocJSONResult.ok(bean);}
}

2、SpringBoot资源文件配置server

通过server配置的资源文件,可改变访问要求
application.properties:

##############################################################################
#
#Server 服务端相关配置
#
##############################################################################
#配置api端口号
server.port=8088
#配置context-path,一般来说这个配置在正式发布的时候不配置
server.servlet.context-path=/Ibaby
#错误页,指定发生错误时,跳转的URL-->BasicErrorController
#server.error.path=/error
#session最大超时时间分钟),默认为30分钟
server.server.session-timeout=60
#该服务绑定IP地址,启动服务器时如本机不是该IP地址则抛出异常启动失败,
#只有特殊需求的情况下才配置,具体根据各自的业务来设置
#server.address=192.168.2.109

访问后:

当我把server.address=192.168.2.109注释解开 ,运行后:
注: IP是自己电脑的,可在命令行输入ipconfig查看(若IP不是自己电脑的,控制台会报错)

3、资源文件中配置tomcat相关属性

了解一下:
application.properties:

#############################################################################
# Server - tomcat 相关常用配置
#############################################################################
# tomac最大线程数,默认为200
# server.tomcat.max-threads=250
# tomcat的URL编码
server.tomcat.uri-encoding=UTF-8
#存放Tomcat的日志,Dump等文件的临时文件夹,默认为系统的tmp文件夹
#(如:E:\Users\......)
#server.tomcat.basedir=F:\springboot-tomcat-tmp
#打开Tomcat的Access日志,并可以设置日志格式的方法
#server.tomcat.access-log-enabled=true
#server.tomcat.access-log-pattern=
#accesslog目录,默认在basedir/logs
#server.tomcat.accesslog.directory=
#日志文件目录
#logging.path=E:/springboot-tomcat-tmp
#日志文件名称,默认为spring.log
#logging.file=myapp.log

四、Spring Boot整合模板引擎

1、SpringBoot整合freemarker

先添加依赖:
pom.xml:

<!--引入freemarker模板依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-freemarker</artifactId></dependency>

application.properties:

################################################################################
#freemarker 静态资源配置
################################################################################
# 是否允许HttpServletRequest属性覆盖(隐藏)控制器生成的同名模型属性。
spring.freemarker.allow-request-override=false
# 是否允许HttpSession属性覆盖(隐藏)控制器生成的同名模型属性。
spring.freemarker.allow-session-override=false
# 是否启用模板缓存。
spring.freemarker.cache=false
# 模板编码。
spring.freemarker.charset=UTF-8
# 是否检查模板位置是否存在。
spring.freemarker.check-template-location=true
# Content-Type value.
spring.freemarker.content-type=text/html
# 是否启用freemarker
spring.freemarker.enabled=true
# 设定所有request的属性在merge到模板的时候,是否要都添加到model中.
spring.freemarker.expose-request-attributes=false
# 是否在merge模板的时候,将HttpSession属性都添加到model中
spring.freemarker.expose-session-attributes=false
# 设定是否以springMacroRequestContext的形式暴露RequestContext给Spring’s macro library使用
spring.freemarker.expose-spring-macro-helpers=true
# 是否优先从文件系统加载template,以支持热加载,默认为true
spring.freemarker.prefer-file-system-access=true
# 设定模板的后缀.
spring.freemarker.suffix=.ftl
# 设定模板的加载路径,多个以逗号分隔,默认:
spring.freemarker.template-loader-path=classpath:/templates/
# 设定FreeMarker keys.
spring.freemarker.settings.template_update_delay=0
spring.freemarker.settings.default_encoding=UTF-8
spring.freemarker.settings.classic_compatible=true

FreemarkerController.java:

@Controller
@RequestMapping("ftl")
public class FreemarkerController {@Autowiredprivate Resource resource;@RequestMapping("/index")public String index(ModelMap map) {map.addAttribute("resource", resource);return "freemarker/index";}@RequestMapping("center")public String center() {return "freemarker/center/center";}
}

页面:
templates/freemarker/center/center.ftl:

<!DOCTYPE html>
<html>
<head lang="en"><meta charset="UTF-8" /><title></title>
</head>
<body>
FreeMarker模板引擎
<h1>center page</h1>
</body>
</html>

templates/freemarker/infex.ftl:

<!DOCTYPE html>
<html>
<head lang="en"><meta charset="UTF-8" /><title></title>
</head>
<body>
FreeMarker模板引擎
<h1>${resource.name}</h1>
<h1>${resource.website}</h1>
<h1>${resource.language}</h1>
</body>
</html>

简单运行一下:

index.ftl会获取resource.properties里的值:

2、SpringBoot整合thymeleaf

Thymeleaf 是一个跟 Velocity、FreeMarker 类似的模板引擎,它可以完全替代 JSP 。相较与其他的模板引擎,它有如下三个极吸引人的特点:

1.Thymeleaf 在有网络和无网络的环境下皆可运行,即它可以让美工在浏览器查看页面的静态效果,也可以让程序员在服务器查看带数据的动态页面效果。这是由于它支持 html 原型,然后在 html 标签里增加额外的属性来达到模板+数据的展示方式。浏览器解释 html 时会忽略未定义的标签属性,所以 thymeleaf 的模板可以静态地运行;当有数据返回到页面时,Thymeleaf 标签会动态地替换掉静态内容,使页面动态显示。

2.Thymeleaf 开箱即用的特性。它提供标准和spring标准两种方言,可以直接套用模板实现JSTL、 OGNL表达式效果,避免每天套模板、该jstl、改标签的困扰。同时开发人员也可以扩展和创建自定义的方言。

3.Thymeleaf 提供spring标准方言和一个与 SpringMVC 完美集成的可选模块,可以快速的实现表单绑定、属性编辑器、国际化等功能。

首先先引入依赖:
pom.xml:

<!--引入thymeleaf 模板依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-thymeleaf</artifactId></dependency>

配置文件:application.properties:

###################################################################
#thymeleaf 静态资源配置
###################################################################
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.suffix=.html
spring.thymeleaf.mode=HTML5
spring.thymeleaf.encoding=UTF-8
spring.thymeleaf.servlet.content-type=text/html
#关闭缓存,即时刷新,上线生产环境需求改为true
spring.thymeleaf.cache=false

控制器ThymeleafController.java:

@Controller
@RequestMapping("th")
public class ThymeleafController {@RequestMapping("/index")public String index(ModelMap map) {map.addAttribute("name", "thymeleaf-cute-baby");return "thymeleaf/index";}@RequestMapping("templates/freemarker/center")public String center() {return "thymeleaf/center/center";}
}

页面:
templates/thymeleaf/index.html:

<!DOCTYPE html>
<html xmlns:th="http://www.w3.org/1999/xhtml">
<head lang="en"><meta charset="UTF-8" /><title></title>
</head>
<body>
Thymeleaf模板引擎
<h1 th:text="${name}">Hello World~~~~~~~</h1>
</body>
</html>

templates/thymeleaf/center/center.html:

<!DOCTYPE html>
<html>
<head lang="en"><meta charset="UTF-8" /><title></title>
</head>
<body>
Thymeleaf模板引擎
<h1>center page</h1>
</body>
</html>

运行结果:

thymeleaf常用标签的使用方法

基本使用方式-----------------------------------------------------------------------对象引用方式
时间类型转换-----------------------------------------------------------------------text与utext
URL-----------------------------------------------------------------------------------引入静态资源文件js/css
条件判断th:if------------------------------------------------------------------------th:unless与th:if
循环th:each-------------------------------------------------------------------------text与utext
th:switch与th:case

渲染概念:根据标签里设置的属性进行页面的显示(例如input标签的value就可以进行显示文字)。

一、基本使用方式:标签里使用th:text="${}",这种形式可以获取到后端传过来的数据,其中th:后面可以是标签里的属性,像th:id,th:name,th:value等。

二、对象引用类型:不使用对象.属性这种方式,外边嵌套一层div,然后th:object= “$ {传过来的对象名}” ,然后$符号替换成*号即可。

三、时间类型转换:默认是Date类型显示,可以通过在#dates.format(传过来的日期参数,日期的格式)。如图

四、text与utext的比较:如果th:后面是text,那么它会把传过来的内容原样的显示出来。而utext它会解析这个数据如果是html里的样式及标签,则自动转换成相应样式。


五、URL的方式:thymeleaf的url方式,th:href="@{地址}",它也支持普通的方式。如图

六、引入静态资源文件js/css:thymeleaf要引入静态文件,需要在application.properties中进行设置。如图,也就是说该项目如果使用静态文件会到static中去找。

#设定静态文件路径,js、css等
spring.mvc.static-path-pattern=/static/**

如下方式进行引入和url的方式相差不多

<script th:src="@{/static/js/test.js}"></script>

thymeleaf支持的form表单绑定url形式,如图,其中th:field可以自动解析为id=“”,name=“”,value=“”,不推荐使用,可读性不好,普通的方式也支持。

七、条件判断th:if——>和el表达式使用相同,大于gt,大于等于ge,小于lt,小于等于le,如果条件不满足则该标签不起作用。

判断的常用使用场景:列表标签,默认的选择和eq比较相等的。如图,eq写在外面也可以。

八、th:unless与th:if——>与if作用相反的。
九、th:switch与th:case——> #{roles.manager}相当于资源文件的使用,前提是进行资源文件的配置

application.properties:

##############################################################
#配置i18n资源文件,供thymeleaf读取
##############################################################
spring.messages.basename=i18n/messages
spring.messages.cache-seconds=3600
spring.messages.encoding=UTF-8

resources/i18n/messages.properties:

############################################################
#用户自定义权限
############################################################
#普通管理员
roles.manager=manager
roles.superadmin=superadmin


输入的是superadmin,结果对应为:

十、th:each——> 循环的作用,userList为传过来的集合,而person相当于jstl中的每一个变量。

测试源码ThymeleafController.java:

   @RequestMapping("test")public String test(ModelMap map) {User u = new User();u.setName("superadmin");u.setAge(10);u.setPassword("123465");u.setBirthday(new Date());u.setDesc("<font color='green'><b>hello imooc</b></font>");map.addAttribute("user", u);User u1 = new User();u1.setAge(19);u1.setName("imooc");u1.setPassword("123456");u1.setBirthday(new Date());User u2 = new User();u2.setAge(17);u2.setName("LeeCX");u2.setPassword("123456");u2.setBirthday(new Date());List<User> userList = new ArrayList<>();userList.add(u);userList.add(u1);userList.add(u2);map.addAttribute("userList", userList);return "thymeleaf/test";}

五、Spring Boot配置全局的异常捕获

主要讲解三种异常捕获形式:

页面跳转异常
ajax异常
统一返回异常的形式

浏览器请求,会得到SpringBoot默认的异常页面:

1、页面跳转形式

引用前面所用到的IMoocJSONResult.java;

错误处理类:
IMoocExceptionHandler.java:

@ControllerAdvice
public class IMoocExceptionHandler {public static final String IMOOC_ERROR_VIEW = "error";@ExceptionHandler(value = Exception.class)    //指定拦截的异常public Object errorHandler(HttpServletRequest reqest,HttpServletResponse response, Exception e) throws Exception {e.printStackTrace();     //打印异常信息ModelAndView mav = new ModelAndView();mav.addObject("exception", e);mav.addObject("url", reqest.getRequestURL());       //发生异常的路径mav.setViewName(IMOOC_ERROR_VIEW);     //指定发生异常之后跳转页面return mav;}
}

@ControllerAdvice标注,可以将其理解为增强型控制器
@ExceptionHandler标注用于指定需要拦截的异常。其余的代码没有需要过多解释的,目的就是在系统中发生了指定的异常时,进行捕获,并返回指定的异常处理路径。

异常测试类
ErrorController.java:

@Controller
@RequestMapping("err")
public class ErrorController {@RequestMapping("/error")public String error() {int a = 1 / 0;return "thymeleaf/error";}
}

页面error.html:

<!DOCTYPE html>
<html xmlns:th="http://www.w3.org/1999/xhtml">
<head lang="en"><meta charset="UTF-8" /><title>捕获全局异常</title>
</head>
<body>
<h1 style="color: red">发生错误:</h1>
<div th:text="${url}"></div>
<div th:text="${exception.message}"></div>
</body>
</html>

运行后页面:

得到了这样的结果,当然这个只是一个测试页面,并不美观。正式环境中当然会有专业的美工和前端来设计报错页面。
控制台:

2、ajax形式

如果出现ajax异常而不捕获的话,就会一直loading,用户体验更加不好。所以ajax请求也需要处理。
ajax形式错误处理类:
IMoocAjaxExceptionHandler.java:

@RestControllerAdvice
public class IMoocAjaxExceptionHandler {@ExceptionHandler(value = Exception.class)public IMoocJSONResult defaultErrorHandler(HttpServletRequest req,Exception e) throws Exception {e.printStackTrace();return IMoocJSONResult.errorException(e.getMessage());}
}

页面:
ajaxerror.html:

<!DOCTYPE html >
<html xmlns:th="http://www.springframework.org/schema/mvc">
<head lang="en"><meta charset="UTF-8" /><title></title><script th:src="@{/static/js/jquery.min.js}"></script></head>
<body><h1>测试ajax错误异常</h1><script th:src="@{/static/js/ajaxerror.js}"></script>
</body>
</html>

static/js/jquery.min.js:

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a.$===n&&(a.$=oc),b&&a.jQuery===n&&(a.jQuery=nc),n},b||(a.jQuery=a.$=n),n});

static/js/ajaxerror.js:

$.ajax({url: "/err/getAjaxerror",type: "POST",async: false,success: function(data) {debugger;if(data.status == 200 && data.msg == "OK") {alert("success");} else {alert("发生异常:" + data.msg);}},error: function (response, ajaxOptions, thrownError) {debugger;alert("error");}
});

异常测试类
ErrorController.java:

//跳转到发生ajax异常页面
@RequestMapping("/ajaxerror")public String ajaxerror() {return "thymeleaf/ajaxerror";}//发生ajax异常
@RequestMapping("/getAjaxerror")@ResponseBodypublic IMoocJSONResult getAjaxerror() {int a = 1 / 0;return IMoocJSONResult.ok();}

运行访问后:


3、统一返回异常的形式

Web异常处理和ajax异常处理结合使用:

步骤: 只需要在后端进行一个判断,判断该请求是否是ajax请求,如果是那么则以ajax异常方式处理,如果是web形式则以web异常处理形式处理即可。
错误处理类:
IMoocExceptionHandler.java:

@ControllerAdvice
public class IMoocExceptionHandler {public static final String IMOOC_ERROR_VIEW = "error";@ExceptionHandler(value = Exception.class)public Object errorHandler(HttpServletRequest reqest,HttpServletResponse response, Exception e) throws Exception {e.printStackTrace();if (isAjax(reqest)) { //调用判断是否ajax请求return IMoocJSONResult.errorException(e.getMessage());} else {ModelAndView mav = new ModelAndView();mav.addObject("exception", e);mav.addObject("url", reqest.getRequestURL());       //发生异常的路径mav.setViewName(IMOOC_ERROR_VIEW);     //指定发生异常之后跳转页面return mav;}}/**判断是否是ajax请求*/public static boolean isAjax(HttpServletRequest httpRequest){return  (httpRequest.getHeader("X-Requested-With") != null&& "XMLHttpRequest".equals( httpRequest.getHeader("X-Requested-With").toString()) );}
}

具体的程序执行过程可以通过断点配和debug调试来了解。

六、Spring Boot整合redis

Redis 安装包
Redis 可视化管理工具

可视化管理工具要收费,所以使用redis就没有用了,如果你有破解版,希望可以帮助我这个穷穷的小白

下载好redis后
打开命令行,进入到当前解压后的目录,输入启动命令:

redis-server redis.windows.conf


提示信息的意思是:

Redis 当前的版本号为 3.2.100
端口是 6379
进程 ID,也就是 PID 为 12636
Redis 官方地址为:http://redis.io

启动后,Redis 的解压目录下有一个名叫 redis-cli.exe 的文件,这是 Redis 自带的一个客户端工具,可以用来连接之前我们启动好的 Redis 服务。双击启动它。

点击进入后,便可以进行关键字的操作
以上便是启动redis和打开的操作,下面便是简单springboot整合redis.

先引入pom.xml依赖:

<!-- 引入 redis 依赖 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency>

添加application.properties配置信息:

##################################################################################
#REDIS 配置
##################################################################################
#Redis数据库索引(默认0)
spring.redis.database=1
#Redis服务器地址
spring.redis.host=192.168.2.109
#Redis服务器连接端口
spring.redis.port=6379
#Redis服务器连接密码(默认为空)
spring.redis.password=
#连接池最大连接数(使用负值表示没有限制)
spring.redis.jedis.pool.max-active=1000
#连接池最大堵塞等待时间(使用负值表示没有限制)
spring.redis.jedis.pool.max-wait=-1
#连接池中最大空闲连接
spring.redis.jedis.pool.max-idle=10
#连接池中的最小空闲连接
spring.redis.jedis.pool.min-idle=2
#连接超时时间(毫秒)
spring.redis.timeout=0

RedisController.java:

@RestController
@RequestMapping("redis")
public class RedisController {@Autowiredprivate StringRedisTemplate strRedis;@RequestMapping("/test")public IMoocJSONResult test() {strRedis.opsForValue().set("cute-baby", "hello redis~~~~~~");return IMoocJSONResult.ok(strRedis.opsForValue().get("cute-baby"));}
}

运行后:

在可视化管理工具可查看对应的值。
当我加入个user对象
RedisController.java:

SysUser user = new SysUser();user.setId("520");user.setUsername("cxlk");user.setPassword("1314");user.setIsDelete(0);user.setRegistTime(new Date());strRedis.opsForValue().set("json:user", JsonUtils.objectToJson(user));SysUser jsonUser = JsonUtils.jsonToPojo(strRedis.opsForValue().get("json:user"), SysUser.class);return IMoocJSONResult.ok(jsonUser);

其结果:

通过上面的操作可以发现其实挺麻烦的每次操作都需要经过strRedis.opsForValue()来,下面便引用redis工具类,创建一部分工具若需其他可补充:
RedisOperator.java:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;@Component
public class RedisOperator {//  @Autowired
//    private RedisTemplate<String, Object> redisTemplate;@Autowiredprivate StringRedisTemplate redisTemplate;// Key(键),简单的key-value操作/*** 实现命令:TTL key,以秒为单位,返回给定 key的剩余生存时间(TTL, time to live)。** @param key* @return*/public long ttl(String key) {return redisTemplate.getExpire(key);}/*** 实现命令:expire 设置过期时间,单位秒** @param key* @return*/public void expire(String key, long timeout) {redisTemplate.expire(key, timeout, TimeUnit.SECONDS);}/*** 实现命令:INCR key,增加key一次** @param key* @return*/public long incr(String key, long delta) {return redisTemplate.opsForValue().increment(key, delta);}/*** 实现命令:KEYS pattern,查找所有符合给定模式 pattern的 key*/public Set<String> keys(String pattern) {return redisTemplate.keys(pattern);}/*** 实现命令:DEL key,删除一个key** @param key*/public void del(String key) {redisTemplate.delete(key);}// String(字符串)/*** 实现命令:SET key value,设置一个key-value(将字符串值 value关联到 key)** @param key* @param value*/public void set(String key, String value) {redisTemplate.opsForValue().set(key, value);}/*** 实现命令:SET key value EX seconds,设置key-value和超时时间(秒)** @param key* @param value* @param timeout*            (以秒为单位)*/public void set(String key, String value, long timeout) {redisTemplate.opsForValue().set(key, value, timeout, TimeUnit.SECONDS);}/*** 实现命令:GET key,返回 key所关联的字符串值。** @param key* @return value*/public String get(String key) {return (String)redisTemplate.opsForValue().get(key);}// Hash(哈希表)/*** 实现命令:HSET key field value,将哈希表 key中的域 field的值设为 value** @param key* @param field* @param value*/public void hset(String key, String field, Object value) {redisTemplate.opsForHash().put(key, field, value);}/*** 实现命令:HGET key field,返回哈希表 key中给定域 field的值** @param key* @param field* @return*/public String hget(String key, String field) {return (String) redisTemplate.opsForHash().get(key, field);}/*** 实现命令:HDEL key field [field ...],删除哈希表 key 中的一个或多个指定域,不存在的域将被忽略。** @param key* @param fields*/public void hdel(String key, Object... fields) {redisTemplate.opsForHash().delete(key, fields);}/*** 实现命令:HGETALL key,返回哈希表 key中,所有的域和值。** @param key* @return*/public Map<Object, Object> hgetall(String key) {return redisTemplate.opsForHash().entries(key);}// List(列表)/*** 实现命令:LPUSH key value,将一个值 value插入到列表 key的表头** @param key* @param value* @return 执行 LPUSH命令后,列表的长度。*/public long lpush(String key, String value) {return redisTemplate.opsForList().leftPush(key, value);}/*** 实现命令:LPOP key,移除并返回列表 key的头元素。** @param key* @return 列表key的头元素。*/public String lpop(String key) {return (String)redisTemplate.opsForList().leftPop(key);}/*** 实现命令:RPUSH key value,将一个值 value插入到列表 key的表尾(最右边)。** @param key* @param value* @return 执行 LPUSH命令后,列表的长度。*/public long rpush(String key, String value) {return redisTemplate.opsForList().rightPush(key, value);}}

来测试一下其效果:
RedisController.java:

@Autowired
private RedisOperator redis;@RequestMapping("/getJsonList")
public IMoocJSONResult getJsonList() {User user = new User();user.setAge(20);user.setName("猪头");user.setPassword("1214");user.setBirthday(new Date());User u1 = new User();u1.setAge(21);u1.setName("小可爱");u1.setPassword("0321");u1.setBirthday(new Date());User u2 = new User();u2.setAge(2020);u2.setName("love");u2.setPassword("61");u2.setBirthday(new Date());List<User> userList = new ArrayList<>();userList.add(user);userList.add(u1);userList.add(u2);redis.set("json:info:userlist", JsonUtils.objectToJson(userList), 2000);String userListJson = redis.get("json:info:userlist");List<User> userListBorn = JsonUtils.jsonToList(userListJson, User.class);return IMoocJSONResult.ok(userListBorn);
}

运行后访问:

添加结果可在redis可视化管理工具查看。

七、Spring Boot整合定时任务task

定时任务quarzt、task,据了解比较常用的是整合quartz,不过居然学到这个整合task那就先了解一下吧,日后有机会在了解quarzt

具体操作:
① 使用注解@EnableScheduling开启定时任务,会自动扫描
ImoocApplication.java:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;import tk.mybatis.spring.annotation.MapperScan;@SpringBootApplication
//扫描 mybatis mapper 包路径
@MapperScan(basePackages = "com.cxlk.myspringboot.mapper")
//扫描 所有需要的包, 包含一些自用的工具类包 所在的路径
@ComponentScan(basePackages= {"com.cxlk.myspringboot", "org.n3r.idworker"})
//开启定时任务
@EnableScheduling
//开启异步调用方法
@EnableAsync
public class ImoocApplication {public static void main(String[] args) {SpringApplication.run(ImoocApplication.class, args);}
}

② 定义@Component作为组件被容器扫描
TestTask.java:

import java.text.SimpleDateFormat;
import java.util.Date;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;@Component
public class TestTask {private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");// 定义每过3秒执行任务@Scheduled(fixedRate = 3000)public void reportCurrentTime() {System.out.println("现在时间:" + dateFormat.format(new Date()));}
}

启动服务器:

定时表达式还有一种,现在的是 @Scheduled(fixedRate = 3000),还有的是cron。
③ 定时任务表达式cron(在线cron表达式生成器地址)

其中Scheduled不支持年的格式。
我定义了一个10秒开始50停的格式,运行查看


复制其Cron的表达式

粘贴到代码里:

@Scheduled(cron = “10-50 * * * * ?”)

启动服务器后观察,可以发现,定时任务只在10~50的区间才进行;
关于springboot整合定时任务task就到这里,其他的定时格式若有兴趣可自行生成摸索。

八、springboot整合异步任务以及使用场景

1、springboot异步执行程序

①注解@EnableAsync开启异步,会自动扫描

@SpringBootApplication
//扫描 mybatis mapper 包路径
@MapperScan(basePackages = "com.cxlk.myspringboot.mapper")
//扫描 所有需要的包, 包含一些自用的工具类包 所在的路径
@ComponentScan(basePackages= {"com.cxlk.myspringboot", "org.n3r.idworker"})
//开启定时任务
@EnableScheduling
//开启异步调用方法
@EnableAsync
public class ImoocApplication {public static void main(String[] args) {SpringApplication.run(ImoocApplication.class, args);}
}

② 定义@Component @Async作为组件被容器扫描执行

@Component
public class AsyncTask {@Asyncpublic Future<Boolean> doTask11() throws Exception {long start = System.currentTimeMillis();Thread.sleep(1000);long end = System.currentTimeMillis();System.out.println("任务1耗时:" + (end - start) + "毫秒");return new AsyncResult<>(true);}@Asyncpublic Future<Boolean> doTask22() throws Exception {long start = System.currentTimeMillis();Thread.sleep(600);long end = System.currentTimeMillis();System.out.println("任务2耗时:" + (end - start) + "毫秒");return new AsyncResult<>(true);}@Asyncpublic Future<Boolean> doTask33() throws Exception {long start = System.currentTimeMillis();Thread.sleep(400);long end = System.currentTimeMillis();System.out.println("任务3耗时:" + (end - start) + "毫秒");return new AsyncResult<>(true);}
}

③异步任务调用,进行测试:

@RestController
@RequestMapping("tasks")
public class DoTask {@Autowiredprivate AsyncTask asyncTask;@RequestMapping("test1")public String test1() throws Exception {long start = System.currentTimeMillis();Future<Boolean> a = asyncTask.doTask11();Future<Boolean> b = asyncTask.doTask22();Future<Boolean> c = asyncTask.doTask33();//死循环,执行完任务后,才跳出while (!a.isDone() || !b.isDone() || !c.isDone()) {if (a.isDone() && b.isDone() && c.isDone()) {break;}}long end = System.currentTimeMillis();String times = "任务全部完成,总耗时:" + (end - start) + "毫秒";System.out.println(times);return times;}
}

启动服务器,访问:


可以发现三个任务同时进行最后算的总时是最长的任务时间,这就体现了异步的强大之处;但也会发现最长的任务不是1秒吗,为什么会多出6毫秒?那是因为在测试代码里多了一个循环
若把@Async注解注释掉,所运行的任务总时长为:1000+600+400+循环

2、异步使用场景:发送短信、发送邮件、App消息推送、节省运维凌晨发布任务时间提供效率。

九、Spring Boot中如何使用拦截器

SpringBoot中拦截器的使用场景:

日志、登陆验证、权限等都会用到拦截器.

springboot中的拦截器与springmvc的拦截器是差不多的,只是配置上有所区别。
1、SpringBoot拦截器的使用

① 使用注解@Configuration配置拦截器

② 继承WebMvcConfigurerAdapter(不过我了解到WebMvcConfigurerAdapter已经被废弃了,现在取代它用的是implements WebMvcConfigurer)

③ 重写addInterceptors添加需要的拦截器地址
WebMvcConfigurer.java:

import com.cxlk.myspringboot.pojo.contoller.interceptor.OneInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;@Configuration
public class WebMvcConfigurer extends WebMvcConfigurerAdapter {@Overridepublic void addInterceptors(InterceptorRegistry registry) {/*** 拦截器按照顺序执行*/registry.addInterceptor(new OneInterceptor()).addPathPatterns("/hello/**");super.addInterceptors(registry);}
}

2、实现HandlerInterceptor的拦截器
OneInterceptor implements.java:

public class OneInterceptor implements HandlerInterceptor {/*** 在请求处理之前进行调用(Controller方法调用之前)*/@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object object) throws Exception {System.out.println("被hello拦截,放行...");return true;/*if (true) {returnErrorResponse(response, IMoocJSONResult.errorMsg("被hello拦截..."));}return false;*/}/*** 请求处理之后进行调用,但是在视图被渲染之前(Controller方法调用之后)*/@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response,Object object, ModelAndView mv)throws Exception {// TODO Auto-generated method stub}/*** 在整个请求结束之后被调用,也就是在DispatcherServlet 渲染了对应的视图之后执行* (主要是用于进行资源清理工作)*/@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response,Object object, Exception ex)throws Exception {// TODO Auto-generated method stub}public void returnErrorResponse(HttpServletResponse response, IMoocJSONResult result)throws IOException, UnsupportedEncodingException {OutputStream out=null;try{response.setCharacterEncoding("utf-8");response.setContentType("text/json");out = response.getOutputStream();out.write(JsonUtils.objectToJson(result).getBytes("utf-8"));out.flush();} finally{if(out!=null){out.close();}}}
}

启动服务器,访问一开始的hello时:


学到这里就突然冒出了一个疑问,拦截器与过滤器的区别?何时用拦截器?何时用过滤器?
过滤器和拦截器的区别:

①拦截器是基于java的反射机制的,而过滤器是基于函数回调。
②拦截器不依赖与servlet容器,过滤器依赖与servlet容器。
③拦截器只能对action请求起作用,而过滤器则可以对几乎所有的请求起作用。
④拦截器可以访问action上下文、值栈里的对象,而过滤器不能访问。
⑤在action的生命周期中,拦截器可以多次被调用,而过滤器只能在容器初始化时被调用一次。
⑥拦截器可以获取IOC容器中的各个bean,而过滤器就不行,这点很重要,在拦截器里注入一个service,可以调用业务逻辑。
⑦拦截器需要在Spring配置文件中配置,过滤器只需要在web.xml中配置

什么时候使用拦截器?什么时候使用过滤器?

如果是非spring项目,那么拦截器不能用,只能使用过滤器。
如果是处理controller前后,既可以使用拦截器也可以使用过滤器。
如果是处理dispaterServlet前后,只能使用过滤器。

这个资料写得也挺好:

十、Spring Boot整合MyBatis

1、使用generatorConfig生成mapper以及pojo,实现反序列化操作

使用generatorConfig生成mapper以及pojo(SpringBoot官方提供了一套方法,这里使用一种更简洁的方式)

步骤1: 首先,需要引入一些依赖,有Mybatis、Mapper、Pagehelper,此外还需要引入数据源(这里使用阿里的druid)、mysql等等。
pom.xml:

<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.0</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.41</version></dependency><!--mybatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.1</version></dependency><!--mapper--><dependency><groupId>tk.mybatis</groupId><artifactId>mapper-spring-boot-starter</artifactId><version>1.2.4</version></dependency><!--pagehelper--><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.2.3</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.9</version></dependency><dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.2</version><scope>compile</scope><optional>true</optional></dependency>

步骤2:如果想使用devtools热部署,还需要在application.properties中引入如下两段代码(部署到生产环境中就不用添加了)。
把之前写的注释解开下面这两个
application.properties:

restart.include.mapper=/mapper-[\w-\.]+jar
restart.include.pagehelper=/pagehelper-[\w-\.]+jar

步骤3:集成Mybatis Generator(这里不使用这种方式,使用更为简洁的方式)
这里的generateConfig.xml文件和SpringBoot官方提供的文件相似,需要注意的是这里使用Mybatis3Simple生成mapper的文件,这中方式比较简洁。

这里使用一个插件MyMapper来做的。

这里是数据库配置信息。

生成pojo的包在如下图进行配置。

生成mapper的包在如下图进行配置。

映射类放置在如图中的位置。

最后设置逆向生成table的名字放置在如图,一般这个名称设置为数据库中对应的表名,这样运行程序时,就会自动逆向生成。

这是上面所使用的类,来逆向生成,这里需要指定逆向生成的文件,在根目录下的generateConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfigurationPUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN""http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"><generatorConfiguration><context id="MysqlContext" targetRuntime="MyBatis3Simple" defaultModelType="flat"><property name="beginningDelimiter" value="`"/><property name="endingDelimiter" value="`"/><plugin type="tk.mybatis.mapper.generator.MapperPlugin"><property name="mappers" value="com.cxlk.myspringboot.util.MyMapper"/></plugin><jdbcConnection driverClass="com.mysql.jdbc.Driver"connectionURL="jdbc:mysql://localhost:3306/leecx"userId="root"password="1214"></jdbcConnection><!-- 对于生成的pojo所在包 --><javaModelGenerator targetPackage="com.cxlk.myspringboot.pojo" targetProject="src/main/java"/><!-- 对于生成的mapper所在目录 --><sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/><!-- 配置mapper对应的java映射 --><javaClientGenerator targetPackage="com.cxlk.myspringboot.mapper" targetProject="src/main/java"type="XMLMAPPER"/><table tableName="sys_user"></table></context>
</generatorConfiguration>

运行下面的主方法就会反序列化生成。
GeneratorDisplay.java:

public class GeneratorDisplay {public void generator() throws Exception{List<String> warnings = new ArrayList<String>();boolean overwrite = true;//指定 逆向工程配置文件File configFile = new File("E:/Users/pc/IdeaProjects/myspringboot/generatorConfig.xml");ConfigurationParser cp = new ConfigurationParser(warnings);Configuration config = cp.parseConfiguration(configFile);DefaultShellCallback callback = new DefaultShellCallback(overwrite);MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,callback, warnings);myBatisGenerator.generate(null);}public static void main(String[] args) throws Exception {try {GeneratorDisplay generatorSqlmap = new GeneratorDisplay();generatorSqlmap.generator();} catch (Exception e) {e.printStackTrace();}}
}

启动:它首先会找到那张表,再找到表中的字段,再逆向生成实体类和mapper文件。
运行GeneratorDisplay.java后,生成了对应自己设计的数据库类和接口、SysUserMapper.xml。
自己设计的表:

如下,逆向生成的实体类,实体类中的注释就是数据库中的注释。
SysUser.java(get和set):

@Table(name = "sys_user")
public class SysUser {@Idprivate Integer id;private String name;private Integer age;private Integer password;}

步骤4:application.properties配置,其中mybatis的pojo类定义在tk.mybatis.springboot.model下,mapper文件在mapper文件夹下。还有通用Mapper配置,它是一个有效类,并且可以设置它的方言。这里还涉及分页的配置,分页使用的方言也是mysql
application.properties:

###################################################################
#mybatis配置
###################################################################
#mybatis
mybatis.type-aliases-package=com.cxlk.myspringboot.pojo
mybatis.mapper-locations=classpath:mapper/*.xml
#通用mapper配置
#mappers 多个接口时逗号隔开
mapper.mappers=com.cxlk.myspringboot.util.MyMapper
mapper.not-empty=false
mapper.identity=MYSQL
#分页插件配置
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql

步骤5:配置数据源
application.properties:

####################################################################################
#配置数据源相关 使用阿里巴巴的druid数据源
####################################################################################
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/leecx
spring.datasource.username=root
spring.datasource.password=1214
spring.datasource.druid.initial-size=1
spring.datasource.druid.min-idle=1
spring.datasource.druid.max-active=20
spring.datasource.druid.test-on-borrow=true
spring.datasource.druid.stat-view-servlet.allow=true

MyMapper.java

/*** 继承自己的MyMapper*/
public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {//TODO//FIXME 特别注意,该接口不能被扫描到,否则会出错
}

以上便是有关反序列化的操作。

2、实现基于mybatis的CRUD功能

由于本小白在慕课网学习的springboot开发常用技术的章节视频里教师讲的有很多准备好的代码,那些准备好的代码我不清楚是什么东西他也没怎么讲解,我听得懵懵懂懂,所以就自己去写了一个关于SpringBoot的CRUD的用户登录系统。
SpringBoot+Mybatis实现用户账号CRUD系统+前后端交互(含源码)

以上便是有关SpringBoot常用的开发技术,希望对你有帮助(σ゚∀゚)σ…:*☆哎哟不错哦

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