springboot之jpa支持

相关pom依赖：

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

　　application.yml配置

spring:
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

自动建表相关代码

package com.lingerqi.springboot03.entity;

import lombok.Data;

import javax.persistence.*;

/**
 * @author xyls
 * @blog name & blog address 027@0030
 * @create  2019-11-30 16:42
 */
@Data
@Entity
@Table(name = "t_springboot_book_1")
public class Book {
    @Id
    @GeneratedValue
    private Integer bid;
    @Column(length = 100)
    private String bname;
    @Column
    private float price;

}

jpa值增删改查

* 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

*/

public interface JpaDao extends JpaRepository<Book, Integer> {

}

controller层

@Autowired
    private JpaDao 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 jpaDao.findById(bid).get();
    }

    @RequestMapping("/getAll")
    public List<Book> getAll(){
        return jpaDao.findAll();
    }

　　　　

新增：

jpa值复杂查询

 *  要使用高级查询必须继承
 * org.springframework.data.jpa.repository.JpaSpecificationExecutor<T>接口
 */
public interface JpaDao extends JpaRepository<Book, Integer>, JpaSpecificationExecutor<Book> {
}

controller层

　

@RequestMapping("/getCondition")
    public  List<Book> getCondition(Book book){
        return jpaDao.findAll(new Specification<Book>() {
            @Override
            public Predicate toPredicate(Root<Book> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                Predicate predicate = criteriaBuilder.conjunction();
                if(book != null){
                    if(null != book.getBname() && !"".equals(book.getBname())){
                        predicate.getExpressions().add(criteriaBuilder.like(root.get("bname"),"%"+book.getBname()+"%"));
                    }
                }
                return predicate;
            }
        });
    }

SpringBoot+bootstarp界面版增删改查及图片上传

pom：

<mysql.version>5.1.44</mysql.version>
<version>${mysql.version}</version>

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.10</version>
</dependency>
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aspects</artifactId>
</dependency>

application.yml文件配置

　

server:
  port: 80
  servlet:
    context-path: /

spring:
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  datasource:
    #1.JDBC
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
    username: root
    password: 123
    druid:
      initial-size: 5
      min-idle: 5
      max-active: 20
      max-wait: 60000
      time-between-eviction-runs-millis: 60000
      min-evictable-idle-time-millis: 30000
      validation-query: SELECT 1 FROM DUAL
      test-while-idle: true
      test-on-borrow: true
      test-on-return: false
      pool-prepared-statements: true
      max-pool-prepared-statement-per-connection-size: 20
      filter:
        stat:
          merge-sql: true
          slow-sql-millis: 5000
      web-stat-filter:
        enabled: true
        url-pattern: /*
        exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
        session-stat-enable: true
        session-stat-max-count: 100
      stat-view-servlet:
        enabled: true
        url-pattern: /druid/*
        reset-enable: true
        login-username: root
        login-password: 123
        allow: 127.0.0.1
        #deny: 192.168.1.100
  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: 20MB
      max-request-size: 60MB

Springbootapplication.java:

@EnableTransactionManagement
@SpringBootApplication

　　

上传文件映射配置类MyWebAppConfigurer.java

package com.lingerqi.springboot03.config;

/**
 * @author xyls
 * @blog name & blog address 027@0030
 * @create  2019-12-01 11:10
 */

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

/**
 * 资源映射路径
 */
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurationSupport {
    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("/uploadImages/**").addResourceLocations("file:E:/temp/");
        super.addResourceHandlers(registry);
    }
}　　

后台代码

StringUtils

package com.lingerqi.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) {
	}
}

　

PageUtil

package com.lingerqi.springboot03.utils;

import java.util.Map;
import java.util.Set;

/**
 * @author xyls
 * @blog name & blog address 027@0030
 * @create  2019-12-01 11:10
 *
 * 基于bootstrap3生成分页代码
 */
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();
    }
}

dao层

package com.lingerqi.springboot03.repository;

import com.lingerqi.springboot03.entity.Teacher;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

/**
 * @author xyls
 * @blog name & blog address 027@0030
 * @create  2019-11-30 16:42
 *
 * 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> {
}

controler层

package com.lingerqi.springboot03.controller;

import com.lingerqi.springboot03.entity.Teacher;
import com.lingerqi.springboot03.service.TeacherService;
import com.lingerqi.springboot03.utils.PageBean;
import com.lingerqi.springboot03.utils.PageUtil;
import com.lingerqi.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;

/**
 * @author xyls
 * @blog name & blog address 027@0030
 * @create  2019-12-01 11:57
 */
@Controller
@RequestMapping("/teacher")
public class TeacherController {
    @Autowired
    private 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 = "E://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 = "E://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";
    }
}

页面层

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>

案例结果截图