SpringMVC实现查询功能

1 web.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://java.sun.com/xml/ns/javaee"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     id="WebApp_ID" version="2.5">

     <!-- 配置HiddenHttpMethodFilter:把POST 请求转为DELETE/PUT 请求 -->
     <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>

     <!-- The front controller of this Spring Web application, responsible for handling all application requests -->
     <servlet>
         <servlet-name>springDispatcherServlet</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>classpath:springmvc.xml</param-value>
         </init-param>
         <load-on-startup>1</load-on-startup>
     </servlet>

     <!-- Map all requests to the DispatcherServlet for handling -->
     <servlet-mapping>
         <servlet-name>springDispatcherServlet</servlet-name>
         <url-pattern>/</url-pattern>
     </servlet-mapping>
 </web-app>

2 springmvc.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:c="http://www.springframework.org/schema/c"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xmlns:context="http://www.springframework.org/schema/context"
     xmlns:mvc="http://www.springframework.org/schema/mvc"
     xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
         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-4.1.xsd">

     <!-- 配置自动扫描的包 -->
     <context:component-scan base-package="com.springmvc"></context:component-scan>

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

     <!-- 处理静态资源 -->
     <mvc:default-servlet-handler/>
     <mvc:annotation-driven></mvc:annotation-driven>

 </beans>

3 实体类com.springmvc.crud.entities

 package com.springmvc.crud.entities;

 import java.util.Date;

 public class Employee {

     private Integer id;
     private String lastName;
     private String email;
     //1 male, 0 female
     private Integer gender;

     private Date birth;
     private Float salary;

     public Integer getId() {
         return id;
     }

     public void setId(Integer id) {
         this.id = id;
     }

     public String getLastName() {
         return lastName;
     }

     public void setLastName(String lastName) {
         this.lastName = lastName;
     }

     public String getEmail() {
         return email;
     }

     public void setEmail(String email) {
         this.email = email;
     }

     public Integer getGender() {
         return gender;
     }

     public void setGender(Integer gender) {
         this.gender = gender;
     }

     public Date getBirth() {
         return birth;
     }

     public void setBirth(Date birth) {
         this.birth = birth;
     }

     public Float getSalary() {
         return salary;
     }

     public void setSalary(Float salary) {
         this.salary = salary;
     }

     @Override
     public String toString() {
         return "Employee [id=" + id + ", lastName=" + lastName + ", email="
                 + email + ", gender=" + gender
                 + ", birth=" + birth + ", salary=" + salary + "]";
     }

     public Employee(Integer id, String lastName, String email, Integer gender) {
         super();
         this.id = id;
         this.lastName = lastName;
         this.email = email;
         this.gender = gender;
     }

     public Employee() {
     }
 }

4 com.springmvc.crud.dao

 package com.springmvc.crud.dao;

 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Repository;

 import com.springmvc.crud.entities.Employee;

 @Repository
 public class EmployeeDao {

     private static Map<Integer,Employee> employees=null;

     /*@Autowired
     private DepartmentDao departmentDao;*/

     static{
         employees = new HashMap<Integer, Employee>();

         employees.put(1001, new Employee(1001, "E-AA", "aa@163.com", 1));
         employees.put(1002, new Employee(1002, "E-BB", "bb@163.com", 1));
         employees.put(1003, new Employee(1003, "E-CC", "cc@163.com", 0));
         employees.put(1004, new Employee(1004, "E-DD", "dd@163.com", 0));
         employees.put(1005, new Employee(1005, "E-EE", "ee@163.com", 1));
     }

     private static Integer initId=1006;

     public void save(Employee employee){
         if(employee.getId()==null){
             employee.setId(initId++);
         }
         //employee.setDepartment(departmentDao.getDepartment(employee.getDepartment().getId()));
         employees.put(employee.getId(), employee);
     }

     public Collection<Employee> getAll(){
         return employees.values();
     }
     public Employee get(Integer id){
         return employees.get(id);
     }

     public void delete(Integer id ){
         employees.remove(id);
     }

 }

5  控制器 com.springmvc.crud.handler

 package com.springmvc.crud.handler;

 import java.util.Map;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;

 import com.springmvc.crud.dao.EmployeeDao;

 @Controller
 public class EmployeeHandler {

     @Autowired
     private EmployeeDao employeeDao;

     @RequestMapping("/listAll")
     public String list(Map<String,Object> map){
         map.put("employees",employeeDao.getAll());
         return "list";
     }
 }

6 WEB-INF/views/list.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
 <!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>Insert title here</title>
 </head>
 <body>
     <table border="1" cellpadding="10" cellspacing="0">

         <tr>
             <th>ID</th>
             <th>LastName</th>
             <th>Email</th>
             <th>Gender</th>
         </tr>

         <c:forEach items="${requestScope.employees }" var="emp">
             <tr>
                 <td>${emp.id }</td>
                 <td>${emp.lastName }</td>
                 <td>${emp.email }</td>
                 <td>${emp.gender==0? 'male' : 'female' }</td>
             </tr>
         </c:forEach>
     </table>
 </body>
 </html>