纯Java配置SpringMvc整合Spring-Data-JPA

包结构

​

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

​

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