sssp-springmvc+spring+spring-data-jpa增删改查

环境：IDE：eclipse、jdk1.7、mysql5.7、maven

项目结构图

上面目录结构你可以自己创建

搭建框架

首先加入maven依赖包以及相关插件

<dependencies>
        <!-- spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>
        <!-- hibernate相关 -->
        <dependency>
            <groupId>antlr</groupId>
            <artifactId>antlr</artifactId>
            <version>2.7.7</version>
        </dependency>
        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.0.6.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.1-api</artifactId>
            <version>1.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate.common</groupId>
            <artifactId>hibernate-commons-annotations</artifactId>
            <version>5.0.1.Final</version>
        </dependency>
        <dependency>
            <groupId>org.jboss</groupId>
            <artifactId>jandex</artifactId>
            <version>2.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.18.1-GA</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.logging</groupId>
            <artifactId>jboss-logging</artifactId>
            <version>3.3.0.Final</version>
        </dependency>
        <!-- jpa相关 -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.0.6.Final</version>
        </dependency>
        <dependency>
            <groupId>javax.transaction</groupId>
            <artifactId>jta</artifactId>
            <version>1.1</version>
        </dependency>
        
        <!-- ehcache缓存 -->
        <dependency>
            <groupId>net.sf.ehcache</groupId>
            <artifactId>ehcache-core</artifactId>
            <version>2.4.3</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-ehcache</artifactId>
            <version>5.0.6.Final</version>
        </dependency>
        <!-- springdata -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-commons</artifactId>
            <version>1.6.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>1.4.2.RELEASE</version>
        </dependency>
        <!-- common相关 -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.1</version>
        </dependency>
        <!-- 日志 -->
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.9.1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.1</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.21</version>
            <scope>test</scope>
        </dependency>
        <!-- MySQL -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-c3p0</artifactId>
            <version>5.0.6.Final</version>
        </dependency>

        <!-- servlet -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.2.1</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
        <!-- 分页插件 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.45</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.1</version>
                <configuration>
                    <!-- <source>1.8</source> -->
                    <encoding>utf-8</encoding>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <uriEncoding>UTF-8</uriEncoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

注意：1.上面的spring-data-commons和spring-data-jpa版本问题，不然会出现莫名其妙的错误。

　　　2.我这里使用的是tomcat7-maven-plugin插件

jar包引入完之后，下边我们开始从web.xml配置

web.xml

<!-- 配置spring监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- 加载application配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <!-- 配置字符编码过滤器 -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- 解决懒加载问题 -->
  <filter>
      <filter-name>openEntityManagerInViewFilter</filter-name>
      <filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
  </filter>
  <filter-mapping>
      <filter-name>openEntityManagerInViewFilter</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- 配置restfull风格 -->
  <filter>
      <filter-name>hiddenHttpMethodFilter</filter-name>
      <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
  </filter>
  <filter-mapping>
      <filter-name>hiddenHttpMethodFilter</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- 配置前端控制器 -->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 加载配置springmvc配置文件 -->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

注意：上面的配置就多一个懒加载，这个是为了解决spring-data-jpa懒加载异常的。

接下来开始配置springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context" 
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
        <!-- 扫描注解的包 -->
        <context:component-scan base-package="com.jiangfx.controller"/>
        <!-- 开启注解 -->
        <mvc:annotation-driven/>
        <!--静态资源访问-->
        <mvc:default-servlet-handler/>

        <!-- 配置视图解析器 -->
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/"></property>
            <property name="suffix" value=".jsp"></property>
        </bean>    
</beans>

然后配置applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/data/jpa 
        http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- 扫描注解的包 -->
    <context:component-scan base-package="com.jiangfx.service"/>
    <!-- 配置数据库 -->
    <!-- 加载配置文件 -->
    <context:property-placeholder location="classpath*:db.properties" />
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${db.driverClassName}" />
        <property name="jdbcUrl" value="${db.url}" />
        <property name="user" value="${db.username}" />
        <property name="password" value="${db.password}" />
    </bean>                 
    <!-- 2.配置jpa的entityManagerFactory -->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <!-- 指定Entity实体类包路径 -->
        <property name="packagesToScan" value="com.jiangfx.entity"></property>
        <!-- 指定Jpa持久化实现厂商类 -->
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean>
        </property>
        <!-- jpa属性 -->
        <property name="jpaProperties">
            <props>
                <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
                <prop key="hibernate.format_sql">true</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>
                <!-- 二级缓存 -->
                <prop key="hibernate.cache.use_second_level_cache">true</prop>
                <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop>
                <!-- <prop key="hibernate.cache.use_query_cache">true</prop> -->
            </props>
        </property>
        <!-- <property name="sharedCacheMode" value="ENABLE_SELETIVE"></property> -->
    </bean>
    
    <!-- 3.配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"></property>
    </bean>  
    <tx:annotation-driven transaction-manager="transactionManager"/>
    
    <!-- 配置springdata -->
    <jpa:repositories base-package="com.jiangfx.repository" entity-manager-factory-ref="entityManagerFactory"></jpa:repositories>
    
    
</beans>

注意：上面要引入jpa的命名空间

上面数据库配置文件db.properties

db.driverClassName=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/springdatajpa?charcterEncoding=utf-8
db.username=root
db.password=

现在框架搭建完成，下面开始着手完成增删改查功能。

controller

EmpController

package com.jiangfx.controller;

import java.util.Date;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.jiangfx.entity.Dept;
import com.jiangfx.entity.Emp;
import com.jiangfx.service.DeptService;
import com.jiangfx.service.EmpService;
import com.jiangfx.service.impl.EmpServiceImpl;


@Controller
public class EmpController {

    //注入empservice
    @Autowired
    private EmpService empService;
    //注入deptService
    @Autowired
    private DeptService deptService;
    
    /**
     * 查询：直接使用分页查询，这都是接口定义好的方法。不需要我们在写，方便。
     */
    @RequestMapping(value="/list",method=RequestMethod.GET)
    public String list(ModelMap map,@RequestParam(defaultValue="1",required=false,value="pageNo") Integer pageNo){
        Page<Emp> page = empService.getPage(pageNo, 3);
        map.put("page", page);
        return "emp";
    }
    
    /**
     * 跳转到添加页面
     */
    @RequestMapping(value="saveEmpPage",method=RequestMethod.GET)
    public String savePage(ModelMap map){
        List<Dept> depts = deptService.getListDepts();
        map.addAttribute("depts", depts);
        return "saveEmpPage";
    }

    /**
     * 添加：ajax异步校验用户名是否存在
     */
    @RequestMapping(value="/checkName",method=RequestMethod.POST)
    @ResponseBody
    public String checkName(String ename){
        Emp emp = empService.getByName(ename);
        System.out.println(emp);
        if(emp != null){
            return "1";
        }else{
            return "0";
        }
    }
    
    /**
     * 添加
     */
    @RequestMapping(value="/saveEmp",method=RequestMethod.POST)
    public String save(Emp emp){
        emp.setTime(new Date());
        empService.save(emp);
        return "redirect:/list";
    }
    /**
     * 根据id查询
     */
    @RequestMapping(value="/getById",method=RequestMethod.GET)
    public void getById(Integer eid){
        Emp emp = empService.getById(eid);
    }
    /**
     * 跳转到修改页面
     */
    @RequestMapping("/updatePage")
    public String updatePage(Integer eid,ModelMap map){
        //先查询
        Emp emp = empService.getById(eid);
        map.addAttribute("emp", emp);
        return "updatePage";
    }
    /**
     * 修改
     */
    @RequestMapping(value="/update",method=RequestMethod.POST)
    public String update(Emp emp,ModelMap map){
        empService.update(emp);
        /*List<Dept> depts = deptService.getListDepts();
        map.addAttribute("depts", depts);*/
        return "redirect:/list";
    }
    /**
     * 删除
     */
    @RequestMapping(value="/deleteEmp",method=RequestMethod.GET)
    public String deleteEmp(Integer eid){
        empService.deleteEmp(eid);
        return "redirect:/list";
    }
}

serviceImpl

EmpServiceImpl

package com.jiangfx.controller;

import java.util.Date;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.jiangfx.entity.Dept;
import com.jiangfx.entity.Emp;
import com.jiangfx.service.DeptService;
import com.jiangfx.service.EmpService;
import com.jiangfx.service.impl.EmpServiceImpl;


@Controller
public class EmpController {

    //注入empservice
    @Autowired
    private EmpService empService;
    //注入deptService
    @Autowired
    private DeptService deptService;
    
    /**
     * 查询：直接使用分页查询，这都是接口定义好的方法。不需要我们在写，方便。
     */
    @RequestMapping(value="/list",method=RequestMethod.GET)
    public String list(ModelMap map,@RequestParam(defaultValue="1",required=false,value="pageNo") Integer pageNo){
        Page<Emp> page = empService.getPage(pageNo, 3);
        map.put("page", page);
        return "emp";
    }
    
    /**
     * 跳转到添加页面
     */
    @RequestMapping(value="saveEmpPage",method=RequestMethod.GET)
    public String savePage(ModelMap map){
        List<Dept> depts = deptService.getListDepts();
        map.addAttribute("depts", depts);
        return "saveEmpPage";
    }

    /**
     * 添加：ajax异步校验用户名是否存在
     */
    @RequestMapping(value="/checkName",method=RequestMethod.POST)
    @ResponseBody
    public String checkName(String ename){
        Emp emp = empService.getByName(ename);
        System.out.println(emp);
        if(emp != null){
            return "1";
        }else{
            return "0";
        }
    }
    
    /**
     * 添加
     */
    @RequestMapping(value="/saveEmp",method=RequestMethod.POST)
    public String save(Emp emp){
        emp.setTime(new Date());
        empService.save(emp);
        return "redirect:/list";
    }
    /**
     * 根据id查询
     */
    @RequestMapping(value="/getById",method=RequestMethod.GET)
    public void getById(Integer eid){
        Emp emp = empService.getById(eid);
    }
    /**
     * 跳转到修改页面
     */
    @RequestMapping("/updatePage")
    public String updatePage(Integer eid,ModelMap map){
        //先查询
        Emp emp = empService.getById(eid);
        map.addAttribute("emp", emp);
        return "updatePage";
    }
    /**
     * 修改
     */
    @RequestMapping(value="/update",method=RequestMethod.POST)
    public String update(Emp emp,ModelMap map){
        empService.update(emp);
        /*List<Dept> depts = deptService.getListDepts();
        map.addAttribute("depts", depts);*/
        return "redirect:/list";
    }
    /**
     * 删除
     */
    @RequestMapping(value="/deleteEmp",method=RequestMethod.GET)
    public String deleteEmp(Integer eid){
        empService.deleteEmp(eid);
        return "redirect:/list";
    }
}

EmpService

package com.jiangfx.service;

import org.springframework.data.domain.Page;

import com.jiangfx.entity.Emp;

public interface EmpService {
    Page<Emp> getPage(Integer pageNo, Integer pageSize);

    /**
     * 校验用户名是否存在
     * @param ename
     * @return
     */
    Emp getByName(String ename);

    /**
     * 添加用户
     * @param emp
     */
    void save(Emp emp);

    /**
     * 根据id查询
     * @param eid
     * @return
     */
    Emp getById(Integer eid);

    /**
     * 修改
     * @param emp
     */
    void update(Emp emp);

    /**
     * 删除
     * @param emp
     */
    void deleteEmp(Integer eid);
}

repository

package com.jiangfx.repository;

import org.hibernate.annotations.UpdateTimestamp;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;

import com.jiangfx.entity.Emp;

public interface EmpRepository extends JpaRepository<Emp, Integer> {

    /**
     * 根据用户名查询
     * @param ename
     * @return
     */
    @Query("from Emp where ename= :ename")
    Emp getname(@Param("ename") String ename);
    
    /**
     * 分页查询，添加,修改：不需要定义方法，直接调用父接口中的save()方法
     */
    
    /**
     * 删除：也可以不定义方法，和上面一样，可以直接电涌父接口中的方法
     * @return 
     */
    /*@Modifying
    @Query("delete from Emp where eid= :eid")
    void delete(@Param("eid") Integer eid);*/
    
    
}

实体类entity

package com.jiangfx.entity;


import java.io.Serializable;
import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import org.hibernate.annotations.UpdateTimestamp;
import org.springframework.format.annotation.DateTimeFormat;

@Table(name="emp")
@Entity
public class Emp implements Serializable {

    private static final long serialVersionUID = 1L;
    private Integer eid;
    private String ename;
    private String eage;
    @DateTimeFormat(pattern="yyyy-MM-dd")
    private Date time;
    private Dept dept;
    
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Id
    public Integer getEid() {
        return eid;
    }
    public void setEid(Integer eid) {
        this.eid = eid;
    }
    public String getEname() {
        return ename;
    }
    public void setEname(String ename) {
        this.ename = ename;
    }
    public String getEage() {
        return eage;
    }
    public void setEage(String eage) {
        this.eage = eage;
    }
    @Temporal(TemporalType.TIMESTAMP)
    public Date getTime() {
        return time;
    }
    public void setTime(Date time) {
        this.time = time;
    }
    
    @JoinColumn(name="did")
    @ManyToOne(fetch=FetchType.LAZY)
    public Dept getDept() {
        return dept;
    }
    public void setDept(Dept dept) {
        this.dept = dept;
    }
    @Override
    public String toString() {
        return "Emp [eid=" + eid + ", ename=" + ename + ", eage=" + eage + ", time=" + time + ", dept=" + dept + "]";
    }
}

下面是一些jsp页面

emp.jsp显示分页查询员工列表

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<!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=UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css"/>
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js" ></script>
<title>员工</title>
</head>
<body>
    <div class="container">
        <table class="table table-hover table-bordered">
          <tr>
            <th>ID</th>
            <th>姓名</th>
            <th>年龄</th>
            <th>创建时间</th>
            <th>部门</th>
            <th colspan="3">操作</th>
          </tr>
          <c:forEach items="${page.content}" var="emp">
          <tr>
            <td>${emp.eid}</td>
            <td>${emp.ename}</td>
            <td>${emp.eage}</td>
            <td>
                <fmt:formatDate value="${emp.time}" pattern="yyyy-MM-dd"/>
            </td>
            <td>${emp.dept.dname}</td>
            <td>
                <a href="${pageContext.request.contextPath }/saveEmpPage">添加</a>
            </td>
             <td><a href="${pageContext.request.contextPath }/deleteEmp?eid=${emp.eid}">删除</a> </td>
             <td><a href="${pageContext.request.contextPath }/updatePage?eid=${emp.eid}">修改</a> </td>
          </tr>
          </c:forEach>
        </table>
        <p>共${page.totalPages}页</p>
        <p>当前第${page.number+1}页</p>
        <a href="list?pageNo=${page.number+1}">上一页</a>
        <a href="list?pageNo=${page.number+1-1}">上一页</a>
        <a href="list?pageNo=${page.number+1+1}">下一页</a>
    </div>
    <!-- 模态框（Modal） -->
    <%-- <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                    <h4 class="modal-title" id="myModalLabel">模态框（Modal）标题</h4>
                </div>
                <div class="modal-body">
                    <form>
                      <div class="form-group">
                        <label for="exampleInputEmail1">姓名</label>
                        <input type="text" name="ename" class="form-control" id="exampleInputEmail1" placeholder="姓名">
                      </div>
                      <div class="form-group">
                        <label for="exampleInputPassword1">年龄</label>
                        <input type="text" name="eage" class="form-control" id="exampleInputPassword1" placeholder="年龄">
                      </div>
                      <label for="exampleInputEmail1">部门</label>
                      <select class="form-control" name="dept.did">
                            <c:forEach items="${depts }" var="dept">
                                <option value="${dept.did }">${dept.dname }</option>
                            </c:forEach>    
                        </select>
                    </form>
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
                    <button type="button" class="btn btn-primary">提交更改</button>
                </div>
            </div>
        </div> 
    </div>--%>
  </body>
</html>

添加员工信息页面

saveEmpPage.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!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=UTF-8">
<title>添加员工页面</title>
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script type="text/javascript">
    $(function(){
        $("#name").change(function(){
            var name = $("this").val();
            var args = {"ename":name,"date":new Date()};
            $.ajax({
                url:"${pageContext.request.contextPath}/checkName",
                type:"post",
                data:args,
                success:function(result){
                    if(result=="0"){
                        alert("用户名可用")
                    }else {
                        alert("用户名不可用")
                    }
                }
            });
        });
    });
</script>
</head>
<body>
    <form action="${pageContext.request.contextPath }/saveEmp" method="post">
        姓名<input type="text" id="name" name="ename">
        年龄<input type="text" name="eage">
        部门<select class="form-control" name="dept.did">
                <c:forEach items="${depts }" var="dept">
                    <option value="${dept.did }">${dept.dname }</option>
                </c:forEach>    
            </select>
            <input type="submit" value="提交">
    </form>
</body>
</html>

修改员工信息页面

updatePage.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!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=UTF-8">
<title>修改页面</title>
</head>
<body>
    <form action="${pageContext.request.contextPath }/update" method="post">
        <input type="hidden" name="eid" value="${emp.eid }">
        姓名<input type="text" name="ename" value="${emp.ename }">
        年龄<input type="text" name="eage" value="${emp.eage }">
        部门<%-- <select class="form-control" name="dept.did">
                <c:forEach items="${depts }" var="dept">
                    <option value="${dept.did }">${dept.dname }</option>
                </c:forEach>    
            </select> --%>
            <input type="submit" value="提交">
    </form>
</body>
</html>

首页index.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=UTF-8">
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<title>Insert title here</title>
</head>
<body>
　　<a href="${pageContext.request.contextPath }/list">员工查询</a>
　　<a href="${pageContext.request.contextPath }/getlist">部门查询</a>
</body>
</html>

最后附上数据库信息

-- ----------------------------
-- Table structure for dept
-- ----------------------------
DROP TABLE IF EXISTS `dept`;
CREATE TABLE `dept` (
  `did` int(11) NOT NULL,
  `dname` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`did`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of dept
-- ----------------------------
INSERT INTO `dept` VALUES ('1', '研发');
INSERT INTO `dept` VALUES ('2', '测试');
INSERT INTO `dept` VALUES ('3', '销售');

-- ----------------------------
-- Table structure for emp
-- ----------------------------
DROP TABLE IF EXISTS `emp`;
CREATE TABLE `emp` (
  `eid` int(11) NOT NULL AUTO_INCREMENT,
  `ename` varchar(255) DEFAULT NULL,
  `eage` varchar(255) DEFAULT NULL,
  `time` datetime DEFAULT NULL,
  `did` int(11) DEFAULT NULL,
  PRIMARY KEY (`eid`),
  KEY `FKjq3nwkl52kinwb7t6l8f9ljtv` (`did`),
  CONSTRAINT `FKjq3nwkl52kinwb7t6l8f9ljtv` FOREIGN KEY (`did`) REFERENCES `dept` (`did`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of emp
-- ----------------------------
INSERT INTO `emp` VALUES ('1', '钱七', '21', '2018-04-23 22:57:07', '3');
INSERT INTO `emp` VALUES ('2', '曹操', '45', '2018-04-23 22:57:23', '3');
INSERT INTO `emp` VALUES ('3', '张三', '25', '2018-04-24 16:06:59', '1');
INSERT INTO `emp` VALUES ('4', '李四', '26', '2018-04-25 10:49:24', '2');
INSERT INTO `emp` VALUES ('5', '王五', '35', '2018-04-25 10:49:39', '2');
INSERT INTO `emp` VALUES ('6', '赵六', '30', '2018-04-25 10:50:15', '1');