注：日常学习记录贴，下面描述的有误解的话请指出，大家一同学习。

因为我公司现在用的是postgresql数据库，所以我也用postgresql进行测试

一、前言

1.Spring boot 会默认读取src/main/resource路径下的application.properties（或者application.yml）文件的内容，一般自定义的配置文件也位于此目录之下。

2配置文件会自动加载，意思就是将文件读取到Spring容器之中，更确切的说就是将各个配置项装载到Spring上下文容器之中供随时取用。

　　application.properties配置文件是在SpringBoot项目启动的时候被自动加载的，其内部的相关设置会自动覆盖SpringBoot默认的对应设置项，所以的配置项均会保存到Spring容器之中。

二、数据库

1.创建db:springbootDemo

2.创建schema:db_user

3.创建表和数据

CREATE TABLE "db_user"."t_user" (
"id" varchar(32) COLLATE "default" NOT NULL,
"name" varchar(255) COLLATE "default",
"password" varchar(255) COLLATE "default",
CONSTRAINT "t_user_pkey" PRIMARY KEY ("id")
)
WITH (OIDS=FALSE);

INSERT INTO "db_user"."t_user" VALUES ('1', 'admin', '123456');
INSERT INTO "db_user"."t_user" VALUES ('2', 'admin2', 'admin212');

三、项目结构

1.application.properties

#设置Tomcat端口，默认8080
server.port=8080
#设置项目ContextPath
server.context-path=/
#设置Tomcat编码
server.tomcat.uri-encoding=UTF-8
#设置视图解析器路径
spring.mvc.view.prefix=/webapp/views/
#设置视图解析器后缀
spring.mvc.view.suffix=.jsp
#开发时关闭缓存,不然没法看到实时页面
spring.thymeleaf.cache=false

#数据库配置
spring.datasource.driver-class-name=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://[你的ip]:5432/springbootDemo?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&currentSchema=db_user
spring.datasource.username=[用户名]
spring.datasource.password=[密码]

#连接池配置
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
#连接等待超时时间
spring.datasource.maxWait=60000
#配置隔多久进行一次检测(检测可以关闭的空闲连接)
spring.datasource.timeBetweenEvictionRunsMillis=60000
#配置连接在池中的最小生存时间
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

#配置.xml文件路径
mybatis.config-locations=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:/com/yang/springbootDemo/mapper/*.xml
#配置模型路径
mybatis.type-aliases-package=com.yang.springbootDemo.model

2.mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
   <settings>
       <setting name="callSettersOnNulls" value="true"/>

       <setting name="cacheEnabled" value="true"/>

       <setting name="lazyLoadingEnabled" value="true"/>

       <setting name="aggressiveLazyLoading" value="true"/>

       <setting name="multipleResultSetsEnabled" value="true"/>

       <setting name="useColumnLabel" value="true"/>

       <setting name="useGeneratedKeys" value="false"/>

       <setting name="autoMappingBehavior" value="PARTIAL"/>

       <setting name="defaultExecutorType" value="SIMPLE"/>

       <setting name="mapUnderscoreToCamelCase" value="true"/>

<setting name="localCacheScope" value="SESSION"/>

<setting name="jdbcTypeForNull" value="NULL"/>

   </settings>

   <typeAliases>
       <typeAlias alias="Integer" type="java.lang.Integer" />
       <typeAlias alias="Long" type="java.lang.Long" />
       <typeAlias alias="HashMap" type="java.util.HashMap" />
       <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
       <typeAlias alias="ArrayList" type="java.util.ArrayList" />
       <typeAlias alias="LinkedList" type="java.util.LinkedList" />
   </typeAliases>
</configuration>

3、ApplicationMain.java 启动类

package com.yang.springbootDemo.controller;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.support.SpringBootServletInitializer;

/**
* spring boot启动类
* @author liuyang
*
* 2018年8月3日下午4:15:20
*/
@SpringBootApplication
@MapperScan("com.yang.springbootDemo.dao")
public class ApplicationMain extends SpringBootServletInitializer{

public static void main(String[] args) throws Exception {
SpringApplication.run(ApplicationMain.class, args);
}

}

4、UserController.java

package com.yang.springbootDemo.controller;

import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.yang.springbootDemo.dao.UserMapper;
import com.yang.springbootDemo.entity.UserEntity;

@Controller
@SpringBootApplication
@RequestMapping("user/")
public class UserController {

@Autowired
   private UserMapper userMapper;

   @RequestMapping("getUser")
   @ResponseBody
   public Object getUser(String name){
       UserEntity user =null;
       if(StringUtils.isNotBlank(name)){
           user = userMapper.getUser(name);
       }
       return user;
   }
}

5、UserMapper.java

package com.yang.springbootDemo.dao;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

import com.yang.springbootDemo.entity.UserEntity;

@Mapper
public interface UserMapper {

UserEntity getUser(@Param("name") String name);
}

6、UserEntity.java

package com.yang.springbootDemo.entity;

public class UserEntity {
private String name;
private String password;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}
}

7、userMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.yang.springbootDemo.dao.UserMapper">

<select id="getUser" parameterType="string" resultType="com.yang.springbootDemo.entity.UserEntity">
select name,password from t_user
where name = #{name}
</select>

</mapper>

8、pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.yang</groupId>
   <artifactId>springbootDemo</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>war</packaging>

<parent>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-parent</artifactId>
       <version>1.5.6.RELEASE</version>
   </parent>
   <dependencies>

<dependency>
           <groupId>postgresql</groupId>
           <artifactId>postgresql</artifactId>
           <version>9.4.1207-atlassian-hosted</version>
       </dependency>

<dependency>
           <groupId>org.mybatis.spring.boot</groupId>
           <artifactId>mybatis-spring-boot-starter</artifactId>
           <version>1.3.0</version>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-thymeleaf</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-test</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-jdbc</artifactId>
           <exclusions>
               <exclusion>
                   <groupId>org.apache.tomcat</groupId>
                   <artifactId>tomcat-jdbc</artifactId>
               </exclusion>
           </exclusions>
       </dependency>

<dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-web</artifactId>
           
           <exclusions>
               <exclusion>
                   <groupId>org.springframework.boot</groupId>
                   <artifactId>spring-boot-starter-tomcat</artifactId>
               </exclusion>
           </exclusions>
       </dependency>

<dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-devtools</artifactId>
           <optional>true</optional>
           <scope>true</scope>
       </dependency>

<dependency>
           <groupId>javax.servlet</groupId>
           <artifactId>javax.servlet-api</artifactId>
           <version>3.1.0</version>
           <scope>provided</scope>
       </dependency>

<dependency>
           <groupId>com.fasterxml.jackson.core</groupId>
           <artifactId>jackson-core</artifactId>
       </dependency>
       <dependency>
           <groupId>com.fasterxml.jackson.core</groupId>
           <artifactId>jackson-databind</artifactId>
       </dependency>
       <dependency>
           <groupId>com.fasterxml.jackson.datatype</groupId>
           <artifactId>jackson-datatype-joda</artifactId>
       </dependency>
       <dependency>
           <groupId>com.fasterxml.jackson.module</groupId>
           <artifactId>jackson-module-parameter-names</artifactId>
       </dependency>
       
       <dependency>
           <groupId>com.github.pagehelper</groupId>
           <artifactId>pagehelper-spring-boot-starter</artifactId>
           <version>1.1.2</version>
       </dependency>
       
       <dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>druid-spring-boot-starter</artifactId>
           <version>1.1.0</version>
       </dependency>
       <dependency>
           <groupId>commons-lang</groupId>
           <artifactId>commons-lang</artifactId>
           <version>2.3</version>
       </dependency>

</dependencies>

<build>
       <finalName>bootDemo</finalName>

<plugins>
           <plugin>
               <artifactId>maven-compiler-plugin</artifactId>
               <configuration>
                   <source>1.8</source>
                   <target>1.8</target>
               </configuration>
           </plugin>
           <plugin>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-maven-plugin</artifactId>
               <configuration>
                   
                   <fork>true</fork>
               </configuration>
           </plugin>
       </plugins>
   </build>
</project>

四、tomcat启动

五、调用接口

转载于:https://www.cnblogs.com/telwanggs/p/10786302.html

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