纯Java配置SpringMvc整合Spring-Data-JPA

柔光的暖阳◎ 2022-05-30 06:25 190阅读 0赞

包结构

![70][]

**WebInitializer.java**

package com.niugang;
    import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
    
    /**
     * 相当于web.xml
     * AbstractAnnotationConfigDispatcherServletInitializer 源码里面有解释
     * 这个是注解形式注册
     * DispatcherServlet容器
     * @author niugang
     *
    
     */
    
    public class WebInitializer  extends AbstractAnnotationConfigDispatcherServletInitializer {
        /**
         * 源码里面与对此方法的解释 配置applicationContext
         */
    @Override
    protected Class<?>[] getRootConfigClasses() {//指定上下文配置类
    
    return  new Class<?>[]{RootConfig.class};
    }
    @Override
    protected Class<?>[] getServletConfigClasses() {//指定sprinfgmvc配置类
    return new Class<?>[]{SpringMVCconfig.class} ;
    }
    @Override
    protected String[] getServletMappings() { 
    
    return new String[]{"/"}; //将DispatcherServlet请求映射的/上
    }
    
    }

**SpringMVCconfig.java**

package com.niugang;
    import javax.servlet.ServletContext;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
    import org.springframework.web.servlet.config.annotation.EnableWebMvc;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;
    import org.springframework.web.servlet.view.freemarker.FreeMarkerView;
    import org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver;
    import freemarker.cache.WebappTemplateLoader;
    
    
    /**
     * 
     * @author niugang springmvc java配置文件
     */
    @Configuration // 说明此类为配置文件类
    @EnableWebMvc // 开启springmvc
    @ComponentScan("com.niugang") // 组件扫描
    
    public class SpringMVCconfig extends WebMvcConfigurerAdapter {
    
    /**
    * freemaker作为视图解析器
    * 
    * @return
    */
    @Bean
    public FreeMarkerViewResolver viewResolver() {
    FreeMarkerViewResolver resolver = new FreeMarkerViewResolver();
    resolver.setContentType("text/html;charset=utf-8");
    /*
    * 如果注释 resolver.setPrefix("/WEB-INF/views/");
    * 下面config需要tplCfg.setTemplateLoader(new
    * WebappTemplateLoader(servletContext,"/WEB-INF/views/"));
    */
    resolver.setPrefix("/WEB-INF/views/");
    resolver.setSuffix(".html");
    resolver.setViewClass(FreeMarkerView.class);
    return resolver;
    
    }
    
     /**
         * 配置freemarker
         * @param servletContext
         * @return
         */
    @Bean
    public FreeMarkerConfigurer freeMarkerConfigurer(ServletContext servletContext) {
    FreeMarkerConfigurer freeMarkerConfigurer = new FreeMarkerConfigurer();
    @SuppressWarnings("deprecation")
    freemarker.template.Configuration tplCfg = new freemarker.template.Configuration();
    tplCfg.setDefaultEncoding("UTF-8");
    tplCfg.setTemplateLoader(new WebappTemplateLoader(servletContext));
    freeMarkerConfigurer.setConfiguration(tplCfg);
    return freeMarkerConfigurer;
    }
    
    
    /**
    * 配置静态资源的处理 对静态资源的请求转发到容器缺省的servlet，而不使用DispatcherServlet
    */
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
    configurer.enable();
    }
    
    }

**RootConfig.java**

package com.niugang;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.context.annotation.ComponentScan.Filter;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.FilterType;
    import org.springframework.context.annotation.Import;
    import org.springframework.web.servlet.config.annotation.EnableWebMvc;
    /**
     * 上下文配置
     * @author niugang
     *
     */
    @Configuration
    @ComponentScan(basePackages={"con.niugang"}, 
        excludeFilters={
            @Filter(type=FilterType.ANNOTATION, value=EnableWebMvc.class)
        }
    )
    //在上下文中引入jdbc配置文件
    @Import({JdbcConfig.class,JPAConfig.class,TransactionalConfig.class})
    public class RootConfig {
    
    }

**TransactionalConfig.java**

package com.niugang;
    import javax.persistence.EntityManagerFactory;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.orm.jpa.JpaTransactionManager;
    import org.springframework.transaction.PlatformTransactionManager;
    import org.springframework.transaction.annotation.EnableTransactionManagement;
    
    
    /**
     * 事务配置文件
     * 
     * @author niugang
     *
     */
    @Configuration
    @EnableTransactionManagement
    /*
     * 事务具体配置可以参考 @EnableTransactionManagement里面源码的配置
     */
    public class TransactionalConfig {
    
    @Bean
    public PlatformTransactionManager transactionManager(EntityManagerFactory localContainerEntityManagerFactoryBean) {
    
    JpaTransactionManager txManager = new JpaTransactionManager();
    txManager.setEntityManagerFactory(localContainerEntityManagerFactoryBean);
    return txManager;
    }
    
    }

**JPAConfig.java**

package com.niugang;
    import javax.persistence.EntityManagerFactory;
    import javax.sql.DataSource;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
    import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
    import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
    
    
    @Configuration
    @EnableJpaRepositories
    public class JPAConfig {
    
    
    @Bean
    
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
    
            // 设置是否生成DDL被已经被初始化后,创建/更新所有相关表
    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    
    
    // vendorAdapter.setGenerateDdl(true);
    LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
    factory.setJpaVendorAdapter(vendorAdapter);
    // 扫描实体类所在包的
    factory.setPackagesToScan("com.niugang.entity");
    // factory.setEntityManagerFactoryInterface(EntityManagerFactory.class);
    factory.setDataSource(dataSource);
    
    return factory;
    }
    
    
    }

**JdbcConfig.java**

package com.niugang;
    import javax.sql.DataSource;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.PropertySource;
    import org.springframework.core.env.Environment;
    import org.springframework.jdbc.datasource.DriverManagerDataSource;
    /**
     * jdbc配置文件
     * @author niugang
     *
     */
    @Configuration
    /*
     * 
     * @PropertySource注解如何使用，源码里面有例子
     * 即从配置文件中如何获取获取值，源码里面也有解释
     *
     */
    @PropertySource("classpath:jdbc.properties") 
    
    public class JdbcConfig {
    
     @Autowired
    private Environment env;
    /**
    * 配置数据源
    * @return
    */
    @Bean
    public DataSource  dataSource(){
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setUrl(env.getProperty("url"));
    dataSource.setDriverClassName(env.getProperty("driverName"));
    dataSource.setUsername(env.getProperty("datausername"));
            dataSource.setPassword(env.getProperty("password"));
    return dataSource;
    }
    
    }

**entity**

package com.niugang.entity;
    
    
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.Table;
    
    //javax.persistence.Entity
    @Entity
    @Table(name="user")
    public class User {
    /**
    *mysql 自定生成主键
    *指示持久性提供者必须分配使用数据库标识列的实体的主键
    */
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)  
    @Column(name="id" ,insertable=false,updatable=false)
    
    private Integer id;
    
           /**
    * @Column中的name默认和字段名相同
    */
    @Column(name = "name")
    private String name;
    @Column(name = "age")
    private Integer age;
    @Column(name = "phone")
    private String phone;
    @Column(name = "password")
    private String password;
    
    
    public String getPassword() {
    return password;
    }
    
    
    public void setPassword(String password) {
    this.password = password;
    }
    
    
    public Integer getId() {
    return id;
    }
    
    
    public void setId(Integer id) {
    this.id = id;
    }
    
    
    public String getName() {
    return name;
    }
    
    
    public void setName(String name) {
    this.name = name;
    }
    
    
    public Integer getAge() {
    return age;
    }
    
    
    public void setAge(Integer age) {
    this.age = age;
    }
    
    
    public String getPhone() {
    return phone;
    }
    
    
    public void setPhone(String phone) {
    this.phone = phone;
    }
    
    
    }

**dao**

package com.niugang.dao;
    import org.springframework.data.jpa.repository.JpaRepository;
    import org.springframework.stereotype.Repository;
    import com.niugang.entity.User;
    /**
     * JpaRepository springboot已经自动配置了，也已经注入数据源了
     * @author niugang
     *
     */
    @Repository
    public interface UserDao extends JpaRepository<User,Integer> {
    
    
     
    
    
    }

**service**

package com.niugang.service;
    
    
    import java.util.List;
    import javax.annotation.Resource;
    import javax.transaction.Transactional;
    import org.springframework.data.domain.Page;
    import org.springframework.data.domain.PageRequest;
    import org.springframework.data.domain.Sort;
    import org.springframework.data.domain.Sort.Direction;
    import org.springframework.data.domain.Sort.Order;
    import org.springframework.stereotype.Service;
    import com.niugang.dao.UserDao;
    import com.niugang.entity.User;
    
    
    @Service
    public class UserService {
    @Resource
    private UserDao userDao;
    
    
    /**
    * 查询全部
    * 
    * @return
    */
    public List<User> queryList() {
    return userDao.findAll();
    
    }
    
        /**
    * 保存
    * 
    * @param user
    */
    @Transactional
    public void save(User user) {
    userDao.save(user);
    throw new RuntimeException("添加数据错误");
    
    
    }
    /**
    * 添加对象集合
    * @param users
    */
    public void save(Iterable<User> users) {
    userDao.save(users);
    
    
    }
    
    
    /**
    * 根据id查询
    * 
    * @param id
    * @return
    */
    public User get(int id) {
    return userDao.getOne(id);
    
    }
    
         /**
    * 删除
    * 
    * @param id
    */
    public void delete(int id) {
    userDao.delete(id);
    }
    /**
    * page分页查询
    * @return
    */
    public Page<User> queryForPage(Integer page) {
    /**
    * PageRequest page起始页从0开始
    */
    PageRequest pageRequest = null;
    if (page== null) {
    pageRequest = new PageRequest(0, 4);
    } else {
    pageRequest = new PageRequest((page-1), 4);
    }
         
    Page<User> findAll = userDao.findAll(pageRequest);
    return findAll;
    }
    
    /**
    * 不分页排序查询
    * @return
    */
    public List<User> queryForSort(){
    Order idOrder = new Order(Direction.DESC, "id"); 
    /*List<Order> orders =new ArrayList<Order>();
    orders.add(idOrder);*/
    return userDao.findAll(new Sort(idOrder));
    }
    }

**controller**

package com.niugang.controller;
    import java.util.List;
    import javax.annotation.Resource;
    import org.apache.commons.lang.StringUtils;
    import org.springframework.data.domain.Page;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.ModelMap;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import com.niugang.entity.User;
    import com.niugang.service.UserService;
    
    /**
     * 
     * @author niugang spring boot helloWrold
     */
    @Controller
    public class IndexController {
    @Resource
    private UserService userService;
    
    @RequestMapping(value = "/")
    public String toIndex(){
    return "redirect:index";
    
    }
    
    /**
    * 跳转到登录页面
    * 
    * @param map
    * @return
    */
    @RequestMapping(value = "/login", method = RequestMethod.GET)
    public String toLogin(ModelMap map) {
    return "login";
    }
    
    
    /**
    * 登录信息校验
    * 
    * @param map
    * @return
    */
    @RequestMapping(value = "/login", method = RequestMethod.POST)
    public String login(ModelMap map, String name,String password) {
    
    
    if (StringUtils.isNotBlank(name)&& !name.equals("admin") && StringUtils.isNotBlank(password)
    && !password.equals("123456")) {
    map.put("errorMessage", "用户名或密码错误");
    return "login";
    }
    
    
    return "redirect:index";
    }
    
    
    /**
    * 跳转到index页面
    * 
    * @return
    */
    @RequestMapping(value = "/index")
    public String index(ModelMap map) {
    List<User> list = userService.queryList();
    map.put("users", list);
    return "index";
    
    }
    
        /**
    * 详情页面
    * @param id
    * @param map
    * @return
    */
    @RequestMapping(value = "/detail/{id}")
    public String detail(@PathVariable(value="id") Integer id,ModelMap map){
    User user = userService.get(id);
    map.put("user", user);
    return "detail";
    }
    /**
    * 删除
    * @param id
    * @return
    */
    @RequestMapping(value = "/delete/{id}")
    public String delete(@PathVariable(value="id") Integer id){
    userService.delete(id);
    return "redirect:/index";
    }
    /**
    * 跳转到添加页面
    * @param map
    * @return
    
    */
    
          @RequestMapping(value = "/save",method = RequestMethod.GET)
    public String toSave(ModelMap map) {
    return "add";
    }
    /**
    * 保存添加信息
    * @param user
    * @return
    */
    @RequestMapping(value = "/save",method = RequestMethod.POST)
    public String save(User user,ModelMap map){
    if(StringUtils.isBlank(user.getName())){
    map.put("error", "用户名不能为空");
    return "add";
    }
    if(user.getAge()==null){
    map.put("error", "非法年龄");
    return "add";
    }
    if(StringUtils.isBlank(user.getPhone())){
    map.put("error", "手机号不能为空");
    return "add";
    }
    user.setPassword("123456");
    userService.save(user);
    return "redirect:/index";
    }
    @RequestMapping(value = "/indexPage")
    public String indexPage(ModelMap map,Integer page) {
    Page<User> queryForPage = userService.queryForPage(page);
    
    map.put("page", queryForPage);
    return "index";
    }
    
    }

**index.html**

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    <style type="text/css">
    table {
    border-collapse: collapse;
    margin: 0 auto;
    }
    
    
    table, td, th {
    border: 1px solid black;
    padding: 15px;
    }
    </style>
    </head>
    
    <body>
    
     <input type="button" value="添加" onclick="add();">
          <a href="indexPage">分页查询</a>
    <table>
    <thead>
    <tr>
    <th>用户名</th>
    <th>年龄</th>
    <th>电话</th>
    <th>操作</th>
    </tr>
    
    
    </thead>
    <tbody>
    <#if users??> <#list users as user>
    <tr>
    <td>${user.name}</td>
    <td>${user.age}</td>
    <td>${user.phone}</td>
    <td><a href="javascript:void(0)" onclick="edit('${user.id}')" >编辑</a>
    <a href="javascript:void(0)" onclick="del('${user.id}')">删除</a>
    <a href="javascript:void(0)" onclick="detail('${user.id}')">详情</a>
    </td>
    </tr>
    </#list> </#if>
    
       <#if page??> 
       <#list page.content as user>
    <tr>
    <td>${user.name}</td>
    <td>${user.age}</td>
    <td>${user.phone}</td>
    <td><a href="javascript:void(0)" onclick="edit('${user.id}')" >编辑</a>
    <a href="javascript:void(0)" onclick="del('${user.id}')">删除</a>
    <a href="javascript:void(0)" onclick="detail('${user.id}')">详情</a>
    </td>
    
    </tr>
    
                           </#list> 
    <tr>
         <td>总页数</td><td>${page.totalPages}</td>
         <td>当前页面</td><td>${page.number+1}</td>
         <td>总记录数</td><td>${page.totalElements}</td>
    </tr>
    <tr>
      <td>
        <#if  (page.totalPages gt page.number+1)>
               <a href="indexPage?page=${page.number+2}">下一页</a>
                <#if (page.number !=0)>
                  <a href="indexPage?page=${page.number}">上一页</a>
                </#if>
        </#if>
          <#if  (page.totalPages lt page.number+2)>
               <a href="indexPage?page=${page.number}">上一页</a>
        </#if>
      </td>
    </tr>
    </#if>
    
    
    </tbody>
    
    </table>
    
    <script type="text/javascript">
    function edit(id){
    alert(id);
    }
    function del(id){
              var flag=confirm("你确定要删除此选项吗");
              if(flag==true){
                   window.location.href="delete/"+id;
              }
    }
    function detail(id){
    window.location.href="detail/"+id;
    }
    function add(){
    window.location.href="save";
    }
    
    
     </script>
    </body>
    </html>

**detail.html**

<!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <title>Document</title>
    </head>
    <body>
      <h2>详情页面</h2>
      用户名：<input type="text" readonly value="${user.name!''}">
      年龄：<input type="text" readonly value="${user.age!''}">
      电话：<input type="text" readonly value="${user.phone!''}">
    </body>
    </html>

**add.html**

<!DOCTYPE html>
    <html lang="en">
    <head>
    <meta charset="UTF-8">
    <title>Document</title>
    </head>
    <body>
      <h2>添加</h2>
          <#if error??> 
             ${error}
           </#if>
       <form action="save" method='post'>
               用户名:<input type="text" name="name"><p>
                年龄:<input type="text" name="age"><p>
                手机号:<input type="text" name="phone"><p>
                <input type="submit" value="提交">
            </form>
    </body>
    
    </html>

**error.jsp**

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>
    </head>
    <body>
        ${errorMsg}
        <a href="javascript:history.back(-1)">返回</a>
    </body>
    
    </html>

运行结果

![70 1][]

![70 2][]

**微信公众号** ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25pdWdhbmcwOTIw_size_16_color_FFFFFF_t_70][]

。

[70]: /images/20220530/413df2526b0945df85510dda3faf21a5.png
[70 1]: /images/20220530/dc7bfc3e53144defb1fa1f54c451113f.png
[70 2]: /images/20220530/ba8b491919054a3ca3d50fec549e2858.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L25pdWdhbmcwOTIw_size_16_color_FFFFFF_t_70]: /images/20220530/08f986f05b74435d94d968978cbab0a2.png