springboot之jpa支持

创建一个sprigboot项目

application.yml文件配置

server:port: 8080servlet:context-path: /spring:jpa:hibernate:ddl-auto: updateshow-sql: truedatasource:#1.JDBCtype: com.alibaba.druid.pool.DruidDataSourcedriver-class-name: com.mysql.jdbc.Driverurl: jdbc:mysql://localhost:3306/tb_226?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTCusername: rootpassword: 123druid:initial-size: 5min-idle: 5max-active: 20max-wait: 60000time-between-eviction-runs-millis: 60000min-evictable-idle-time-millis: 30000validation-query: SELECT 1 FROM DUALtest-while-idle: truetest-on-borrow: truetest-on-return: falsepool-prepared-statements: truemax-pool-prepared-statement-per-connection-size: 20filter:stat:merge-sql: trueslow-sql-millis: 5000web-stat-filter:enabled: trueurl-pattern: /*exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"session-stat-enable: truesession-stat-max-count: 100stat-view-servlet:enabled: trueurl-pattern: /druid/*reset-enable: truelogin-username: adminlogin-password: adminallow: 192.168.213.129#deny: 192.168.1.100

自动建表相关代码
jpa能根据实体类自动创建数据库表格
实体类 Book

package com.hc.springboot03.entity;import lombok.Data;import javax.persistence.*;/*** @author胡聪* @site www.hc.com* @company 公司* @create  2019-11-30 16:24*/
@Data
@Table(name = "t_hc_book")
@Entity
public class Book {//    设置表主键@Id
//    设置自增长@GeneratedValueprivate Integer bid;
//    设置列长度@Column(length = 100)private String bname;@Columnprivate Float price;
}

看看数据库

jpa值增删改查

package com.hc.springboot03.repository;import com.hc.springboot03.entity.Book;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;/*** @author胡聪* @site www.hc.com* @company 公司* @create  2019-11-30 16:44* * 只要继承JpaRepository，通常所用的增删查改方法都有*  *  第一个参数：操作的实体类*  *  第二个参数：实体类对应数据表的主键*/
@Repository
public interface BookRepository extends JpaRepository <Book, Integer>{
}

controller层

package com.hc.springboot03.controller;import com.hc.springboot03.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;/*** @author胡聪* @site www.hc.com* @company 公司* @create  2019-11-30 16:46*/
@RestController
@RequestMapping("/book")
public class BookController {@Autowiredprivate JpaRepository jpaDao;@RequestMapping("/add")public String add(Book book){jpaDao.save(book);return "success";}@RequestMapping("/edit")public String edit(Book book){jpaDao.save(book);return "success";}@RequestMapping("/del")public String del(Book book){jpaDao.delete(book);return "success";}@RequestMapping("/getOne")public Book getOne(Integer bid){
//        会出现懒加载问题：org.hibernate.LazyInitializationException: could not initialize proxy - no Session
//        return jpaDao.getOne(bid);return (Book) jpaDao.findById(bid).get();}@RequestMapping("/getAll")public List<Book> getAll(){return jpaDao.findAll();}
}

Springboot+boot strap界面版之增删改查及图片上传
pom依赖

<dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.1</version></dependency>

application.yml文件配置

spring:thymeleaf:cache: false# 解决图片上传大小限制问题，也可采取配置类servlet:multipart:max-file-size: 20MBmax-request-size: 60MB

上传文件映射配置类MyWebAppConfigurer.java

package com.hc.springboot03.config;import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;/*** @author胡聪* @site www.hc.com* @company 公司* @create  2019-11-30 18:20‘** 资源映射路径*/
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurationSupport {@Overrideprotected void addResourceHandlers(ResourceHandlerRegistry registry) {registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");registry.addResourceHandler("/uploadImages/**").addResourceLocations("file:D:/temp/");super.addResourceHandlers(registry);}
}

后台代码
StringUtils

package com.hc.springboot03.utils;import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;public class StringUtils {// 私有的构造方法，保护此类不能在外部实例化private StringUtils() {}/*** 如果字符串等于null或去空格后等于""，则返回true，否则返回false* * @param s* @return*/public static boolean isBlank(String s) {boolean b = false;if (null == s || s.trim().equals("")) {b = true;}return b;}/*** 如果字符串不等于null或去空格后不等于""，则返回true，否则返回false* * @param s* @return*/public static boolean isNotBlank(String s) {return !isBlank(s);}/*** set集合转string* @param hasPerms* @return*/public static String SetToString(Set hasPerms){return  Arrays.toString(hasPerms.toArray()).replaceAll(" ", "").replace("[", "").replace("]", "");}/*** 转换成模糊查询所需参数* @param before* @return*/public static String toLikeStr(String before){return isBlank(before) ? null : "%"+before+"%";}/***    将图片的服务器访问地址转换为真实存放地址* @param imgpath   图片访问地址（http://localhost:8080/uploadImage/2019/01/26/20190126000000.jpg）* @param serverDir    uploadImage* @param realDir    E:/temp/* @return*/public static String serverPath2realPath(String imgpath, String serverDir, String realDir) {imgpath = imgpath.substring(imgpath.indexOf(serverDir));return imgpath.replace(serverDir,realDir);}/*** 过滤掉集合里的空格* @param list* @return*/public static List<String> filterWhite(List<String> list){List<String> resultList=new ArrayList<String>();for(String l:list){if(isNotBlank(l)){resultList.add(l);}}return resultList;}/*** 从html中提取纯文本* @param strHtml* @return*/public static String html2Text(String strHtml) {String txtcontent = strHtml.replaceAll("</?[^>]+>", ""); //剔出<html>的标签txtcontent = txtcontent.replaceAll("<a>\\s*|\t|\r|\n</a>", "");//去除字符串中的空格,回车,换行符,制表符return txtcontent;}public static void main(String[] args) {}
}

PageBean

package com.hc.springboot03.utils;import javax.servlet.http.HttpServletRequest;
import java.util.Map;public class PageBean {private int page = 1;// 页码private int rows = 3;// 页大小private int total = 0;// 总记录数private boolean pagination = true;// 是否分页//   保存上次查询的参数private Map<String, String[]> paramMap;
//  保存上次查询的urlprivate String url;public void setRequest(HttpServletRequest request) {String page = request.getParameter("page");String rows = request.getParameter("offset");String pagination = request.getParameter("pagination");this.setPage(page);this.setRows(rows);this.setPagination(pagination);this.setUrl(request.getRequestURL().toString());this.setParamMap(request.getParameterMap());}public PageBean() {super();}public Map<String, String[]> getParamMap() {return paramMap;}public void setParamMap(Map<String, String[]> paramMap) {this.paramMap = paramMap;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public int getPage() {return page;}public void setPage(int page) {this.page = page;}public void setPage(String page) {if(StringUtils.isNotBlank(page)) {this.page = Integer.parseInt(page);}}public int getRows() {return rows;}public void setRows(String rows) {if(StringUtils.isNotBlank(rows)) {this.rows = Integer.parseInt(rows);}}public int getTotal() {return total;}public void setTotal(int total) {this.total = total;}public void setTotal(String total) {if(StringUtils.isNotBlank(total)) {this.total = Integer.parseInt(total);}}public boolean isPagination() {return pagination;}public void setPagination(boolean pagination) {this.pagination = pagination;}public void setPagination(String pagination) {if(StringUtils.isNotBlank(pagination) && "false".equals(pagination)) {this.pagination = Boolean.parseBoolean(pagination);}}/*** 最大页* @return*/public int getMaxPage() {int max = this.total/this.rows;if(this.total % this.rows !=0) {max ++ ;}return max;}/*** 下一页* @return*/public int getNextPage() {int nextPage = this.page + 1;if(nextPage > this.getMaxPage()) {nextPage = this.getMaxPage();}return nextPage;}/*** 上一页* @return*/public int getPreviousPage() {int previousPage = this.page -1;if(previousPage < 1) {previousPage = 1;}return previousPage;}/*** 获得起始记录的下标* * @return*/public int getStartIndex() {return (this.page - 1) * this.rows;}@Overridepublic String toString() {return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";}
}

PageUtil

package com.hc.springboot03.utils;import java.util.Map;
import java.util.Set;public class PageUtil {public static String createPageCode(PageBean pageBean) {StringBuffer sb = new StringBuffer();/** 拼接向后台提交数据的form表单*     注意：拼接的form表单中的page参数是变化的，所以不需要保留上一次请求的值*/sb.append("<form id='pageBeanForm' action='"+pageBean.getUrl()+"' method='post'>");sb.append("<input type='hidden' name='page'>");Map<String, String[]> parameterMap = pageBean.getParamMap();if(parameterMap != null && parameterMap.size() > 0) {Set<Map.Entry<String, String[]>> entrySet = parameterMap.entrySet();for (Map.Entry<String, String[]> entry : entrySet) {if(!"page".equals(entry.getKey())) {String[] values = entry.getValue();for (String val : values) {sb.append("<input type='hidden' name='"+entry.getKey()+"' value='"+val+"'>");}}}}sb.append("</form>");if(pageBean.getTotal()==0){return "未查询到数据";}else{sb.append("<li><a href='javascript:gotoPage(1)'>首页</a></li>");if(pageBean.getPage()>1){sb.append("<li><a href='javascript:gotoPage("+pageBean.getPreviousPage()+")'>上一页</a></li>");}else{sb.append("<li class='disabled'><a href='javascript:gotoPage(1)'>上一页</a></li>");}for(int i=pageBean.getPage()-1;i<=pageBean.getPage()+1;i++){if(i<1||i>pageBean.getMaxPage()){continue;}if(i==pageBean.getPage()){sb.append("<li class='active'><a href='#'>"+i+"</a></li>");}else{sb.append("<li><a href='javascript:gotoPage("+i+")'>"+i+"</a></li>");}}if(pageBean.getPage()<pageBean.getMaxPage()){sb.append("<li><a href='javascript:gotoPage("+pageBean.getNextPage()+")'>下一页</a></li>");}else{sb.append("<li class='disabled'><a href='javascript:gotoPage("+pageBean.getMaxPage()+")'>下一页</a></li>");}sb.append("<li><a href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a></li>");}/** 给分页条添加与后台交互的js代码*/sb.append("<script type='text/javascript'>");sb.append("     function gotoPage(page) {");sb.append("           document.getElementById('pageBeanForm').page.value = page;");sb.append("           document.getElementById('pageBeanForm').submit();");sb.append("     }");sb.append("       function skipPage() {");sb.append("           var page = document.getElementById('skipPage').value;");sb.append("            if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>"+pageBean.getMaxPage()+"){");sb.append("             alert('请输入1~N的数字');");sb.append("               return;");sb.append("         }");sb.append("           gotoPage(page);");sb.append("     }");sb.append("</script>");return sb.toString();}
}

实体类entity

package com.hc.springboot03.entity;import lombok.ToString;import javax.persistence.*;@Entity
@Table(name = "t_springboot_teacher")
@ToString
public class Teacher {@Id@GeneratedValueprivate Integer tid;@Column(length = 16)private String tname;@Column(length = 4)private String sex;@Column(length = 100)private String description;@Column(length = 200)private String imagePath;public Integer getTid() {return tid;}public void setTid(Integer tid) {this.tid = tid;}public String getTname() {return tname;}public void setTname(String tname) {this.tname = tname;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getDescription() {return description;}public void setDescription(String description) {this.description = description;}public String getImagePath() {return imagePath;}public void setImagePath(String imagePath) {this.imagePath = imagePath;}
}

dao层

package com.hc.springboot03.repository;import com.hc.springboot03.entity.Teacher;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;/**** 只要继承JpaRepository，通常所用的增删查改方法都有*  第一个参数：操作的实体类*  第二个参数：实体类对应数据表的主键**  要使用高级查询必须继承* org.springframework.data.jpa.repository.JpaSpecificationExecutor<T>接口*/
public interface TeacherDao extends JpaRepository<Teacher, Integer>, JpaSpecificationExecutor<Teacher> {
}

service层

package com.hc.springboot03.service.impl;import com.hc.springboot03.entity.Teacher;
import com.hc.springboot03.repository.TeacherDao;
import com.hc.springboot03.service.TeacherService;
import com.hc.springboot03.utils.PageBean;
import com.hc.springboot03.utils.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;@Service
public class TeacherServiceImpl implements TeacherService {@Autowiredprivate TeacherDao teacherDao;@Overridepublic Teacher save(Teacher teacher) {return teacherDao.save(teacher);}@Overridepublic void deleteById(Integer id) {teacherDao.deleteById(id);}@Overridepublic Teacher findById(Integer id) {return teacherDao.findById(id).get();}@Overridepublic Page<Teacher> listPager(Teacher teacher, PageBean pageBean) {
//        jpa的Pageable分页是从0页码开始Pageable pageable = PageRequest.of(pageBean.getPage()-1, pageBean.getRows());return teacherDao.findAll(new Specification<Teacher>() {@Overridepublic Predicate toPredicate(Root<Teacher> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {Predicate predicate = criteriaBuilder.conjunction();if(teacher != null){if(StringUtils.isNotBlank(teacher.getTname())){predicate.getExpressions().add(criteriaBuilder.like(root.get("tname"),"%"+teacher.getTname()+"%"));}}return predicate;}},pageable);}
}

controler层

package com.hc.springboot03.controller;import com.hc.springboot03.entity.Teacher;
import com.hc.springboot03.service.TeacherService;
import com.hc.springboot03.utils.PageBean;
import com.hc.springboot03.utils.PageUtil;
import com.hc.springboot03.utils.StringUtils;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;@Controller
@RequestMapping("/teacher")
public class TeacherController {@Autowiredprivate TeacherService teacherService;@RequestMapping("/listPager")public ModelAndView list(Teacher teacher, HttpServletRequest request){PageBean pageBean = new PageBean();pageBean.setRequest(request);ModelAndView modelAndView = new ModelAndView();Page<Teacher> teachers = teacherService.listPager(teacher, pageBean);modelAndView.addObject("teachers",teachers.getContent());pageBean.setTotal(teachers.getTotalElements()+"");modelAndView.addObject("pageCode", PageUtil.createPageCode(pageBean)/*.replaceAll("<","<").replaceAll("&gt:",">")*/);modelAndView.setViewName("list");return modelAndView;}@RequestMapping("/toEdit")public ModelAndView toEdit(Teacher teacher){ModelAndView modelAndView = new ModelAndView();modelAndView.setViewName("edit");modelAndView.addObject("sexArr",new String[]{"男","女"});if(!(teacher.getTid() == null || "".equals(teacher.getTid()))) {Teacher t = teacherService.findById(teacher.getTid());modelAndView.addObject("teacher", t);}return modelAndView;}@RequestMapping("/add")public String add(Teacher teacher, MultipartFile image){try {String diskPath = "D://temp/"+image.getOriginalFilename();String serverPath = "/uploadImages/"+image.getOriginalFilename();if(StringUtils.isNotBlank(image.getOriginalFilename())){FileUtils.copyInputStreamToFile(image.getInputStream(),new File(diskPath));teacher.setImagePath(serverPath);}teacherService.save(teacher);} catch (IOException e) {e.printStackTrace();}return "redirect:/teacher/listPager";}@RequestMapping("/edit")public String edit(Teacher teacher, MultipartFile image){String diskPath = "D://temp/"+image.getOriginalFilename();String serverPath = "/uploadImages/"+image.getOriginalFilename();if(StringUtils.isNotBlank(image.getOriginalFilename())){try {FileUtils.copyInputStreamToFile(image.getInputStream(),new File(diskPath));teacher.setImagePath(serverPath);} catch (IOException e) {e.printStackTrace();}}teacherService.save(teacher);return "redirect:/teacher/listPager";}@RequestMapping("/del/{bid}")public String del(@PathVariable(value = "bid") Integer bid){teacherService.deleteById(bid);return "redirect:/teacher/listPager";}
}

list.html

<!DOCTYPE html>
<html lang="en">
<html xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>书籍列表</title><script type="text/javascript" th:src="@{/static/js/xxx.js}"></script><link rel="stylesheet" th:href="@{/static/js/bootstrap3/css/bootstrap.min.css}"><link rel="stylesheet" th:href="@{/static/js/bootstrap3/css/bootstrap-theme.min.css}"><script type="text/javascript" th:src="@{/static/js/bootstrap3/js/jquery-1.11.2.min.js}"></script><script type="text/javascript" th:src="@{/static/js/bootstrap3/js/bootstrap.min.js}"></script>
</head>
<body>
<form th:action="@{/teacher/listPager}" method="post">书籍名称： <input type="text" name="tname" /><input type="submit" value="提交"/>
</form>
<a th:href="@{/teacher/toEdit}">新增</a>
<table border="1px" width="600px"><thead><tr><td>ID</td><td>头像</td><td>姓名</td><td>性别</td><td>简介</td><td>操作</td></tr></thead><tbody><tr th:each="teacher : ${teachers}"><td th:text="${teacher.tid}"></td><td><img style="width: 60px;height: 60px;" id="imgshow" th:src="${teacher.imagePath}" th:alt="${teacher.tname}"/></td><!--<td th:text="${teacher.imagePath}"></td>--><td th:text="${teacher.tname}"></td><td th:text="${teacher.sex}"></td><td th:text="${teacher.description}"></td><td><a th:href="@{'/teacher/del/'+${teacher.tid}}">删除</a><a th:href="@{'/teacher/toEdit?tid='+${teacher.tid}}">修改</a></td></tr></tbody>
</table><nav><ul class="pagination pagination-sm" th:utext="${pageCode}"></ul><!--<ul class="pagination pagination-sm">--><!--<form id='pageBeanForm' action='http://localhost:8080/springboot/teacher/listPager' method='post'><input type='hidden' name='page'></form>--><!--<li><a href='javascript:gotoPage(1)'>首页</a></li>--><!--<li class='disabled'><a href='javascript:gotoPage(1)'>上一页</a></li>--><!--<li class='active'><a href='#'>1</a></li>--><!--<li><a href='javascript:gotoPage(2)'>2</a></li>--><!--<li><a href='javascript:gotoPage(2)'>下一页</a></li>--><!--<li><a href='javascript:gotoPage(4)'>尾页</a></li>--><!--<script type='text/javascript'> function gotoPage(page) {   document.getElementById('pageBeanForm').page.value = page; document.getElementById('pageBeanForm').submit();   }   function skipPage() {   var page = document.getElementById('skipPage').value;    if(!page || isNaN(page) || parseInt(page)<1 || parseInt(page)>4){ alert('请输入1~N的数字');   return; }   gotoPage(page); }</script>--><!--</ul>-->
</nav>
</body>
</html>

edit.html

<!DOCTYPE html>
<html lang="en">
<html xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>用户编辑界面</title><script type="text/javascript">function preShow() {}</script>
</head>
<body><form th:action="@{${teacher.tid} ? '/teacher/edit' : '/teacher/add'}" method="post" enctype="multipart/form-data"><input type="hidden" name="tid" th:value="${teacher.tid}" /><input type="hidden" name="imagePath" th:value="${teacher.imagePath}" /><img id="imgshow" src="" alt=""/><input type="file" name="image" onchange="preShow();"></br>教员名称： <input type="text" name="tname" th:value="${teacher.tname}" /></br>教员描述： <input type="text" name="description" th:value="${teacher.description}" /></br>单选回显<input type="radio" name="sex"th:each ="s:${sexArr}"th:value="${s}"th:text ="${s}"th:attr ="checked=${s == teacher.sex}"><input type="submit" value="提交"/>
</form></body>
</html>

最终结果：

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springboot之jpa支持

springboot之jpa支持

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