SpringMVC学习六

SpringMVC_RESTRUL_CRUD_显示所有员工信息

截图：

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>    
  
  
  <!-- 
          配置org.springframework.web.filter.HiddenHttpMethodFilter:可以把POST请求转为DELETE或POST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>
               <!-- 过滤所有请求 -->
               <url-pattern>/*</url-pattern>
   </filter-mapping>
   
   <!-- 配置DispatcherServlet -->
  
          <servlet>
              <servlet-name>springDispatcherServlet</servlet-name>
              <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
              <!-- 配置 DispatcherServlet的一个初始化参数:配置SpringMvc 配置文件的位置和名称-->
                   <init-param>
                      <param-name>contextConfigLocation</param-name>
                      <param-value>classpath:springmvc.xml</param-value>
              </init-param>
               <init-param>
                      <param-name>encoding</param-name>
                      <param-value>UTF-8</param-value>
              </init-param>
          <!-- 设置启动 -->
          <load-on-startup>1</load-on-startup>
          </servlet>
          
          <servlet-mapping>
          <!-- 请求处理 -->
              <servlet-name>springDispatcherServlet</servlet-name>
              <!-- /:应答所有请求 -->
              <url-pattern>/</url-pattern>
          </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 
         xmlns:aop="http://www.springframework.org/schema/aop"
 
       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" 
 
       xmlns:p="http://www.springframework.org/schema/p"
       
       xmlns:tx="http://www.springframework.org/schema/tx"
 
  xsi:schemaLocation="
 
              http://www.springframework.org/schema/beans    
 
                 http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
     
              http://www.springframework.org/schema/tx      
 
              http://www.springframework.org/schema/tx/spring-mvc-4.0.xsd
 
               http://www.springframework.org/schema/context
 
               http://www.springframework.org/schema/context/spring-context-4.0.xsd
               
               http://www.springframework.org/schema/mvc
               
               http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
 
               http://www.springframework.org/schema/aop
 
             http://www.springframework.org/schema/aop/spring-aop-4.0.xsd">
             
             <!-- 配置自定义扫描包 -->
             <context:component-scan base-package="como.springmvc.handlers"></context:component-scan>
             
           <!-- 配置视图解析器：如何把handler方法返回值解析为实际的物理视图 -->
           <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
           <!-- spring中加入jstl标签库 -->
           <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>
                       <!-- 前缀 -->
                       <property name="prefix" value="/WEB-INF/views/"></property>
                       <!-- 后缀 -->
                       <property name="suffix" value=".jsp"></property>
           </bean>
           </bean> 
           </beans>
 

实体类：

Department.java

package como.springmvc.handlers.entity;

public class Department {
        private int id;
        private String departementName;
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getDepartementName() {
            return departementName;
        }
        public void setDepartementName(String departementName) {
            this.departementName = departementName;
        }
        public Department(int id, String departementName) {
            super();
            this.id = id;
            this.departementName = departementName;
        }
        public Department() {
            super();
        }
        
        
}

Employee.java

package como.springmvc.handlers.entity;

public class Employee {
        private int id;
        private String lastName;
        private String email;
        private int gender;
        private Department department;
        public int getId() {
            return id;
        }
        public void setId(int 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 int getGender() {
            return gender;
        }
        public void setGender(int gender) {
            this.gender = gender;
        }
        public Department getDepartment() {
            return department;
        }
        public void setDepartment(Department department) {
            this.department = department;
        }
        public Employee(int id, String lastName, String email, int gender,
                Department department) {
            super();
            this.id = id;
            this.lastName = lastName;
            this.email = email;
            this.gender = gender;
            this.department = department;
        }
        public Employee() {
            super();
        }
        
        
         
        
}

Dao层代码：

DepartmentDao.java

package como.springmvc.handlers.dao;

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

import org.springframework.stereotype.Repository;

import como.springmvc.handlers.entity.Department;

@Repository//@Repository用于标注数据访问组件，即DAO组件
public class DepartmentDao {
        private static Map<Integer,Department> departments = null;
        
        static{//静态数据，服务器重启恢复原始状态
            departments = new HashMap<Integer,Department>();
            departments.put(101, new Department(101,"D-AA"));
            departments.put(102, new Department(102,"D-BB"));
            departments.put(103, new Department(103,"D-CC"));
            departments.put(104, new Department(104,"D-DD"));
            departments.put(105, new Department(105,"D-EE"));
        }
        //获取全部的departments
        public Collection<Department> getDepartments(){
            return departments.values();
        }
        
        //获取指定id的department
        public Department getDepartment(Integer id){
            return departments.get(id);
        }
}

Employee.java

package como.springmvc.handlers.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 como.springmvc.handlers.entity.Department;
import como.springmvc.handlers.entity.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@123",1, new Department(101, "D-AA")));
            employees.put(1002, new Employee(1002,"E-BB","bb@123",0, new Department(102, "D-BB")));
            employees.put(1003, new Employee(1003,"E-CC","cc@123",1, new Department(103, "D-CC")));
            employees.put(1004, new Employee(1004,"E-DD","dd@123",1, new Department(104, "D-DD")));
            employees.put(1005, new Employee(1005,"E-EE","ee@123",0, new Department(105, "D-EE")));
        }
        
        public Collection<Employee> getAll(){
            return employees.values();
        }
       
        
}

视图层代码：

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>

</title>

  </head>
  
  <body>
    <a href="emps">list all Employees</a>
  </body>
</html>

list.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'list.jsp' starting page</title>
     

  </head>
  
  <body>
    <c:if test="${empty requestScope.employees }">
    no information
    </c:if>
    
    <c:if test="${!empty requestScope.employees }">
    <table border="1" cellpadding="10" cellspacing="0">
            <tr>
            <th>ID</th>
            <th>LastName</th>
            <th>Email</th>
            <th>Gender</th>
            <th>Department</th> 
            <th>Edit</th>
            <th>Delete</th>
            </tr>
            <c:forEach items="${requestScope.employees }" var="emp">
                    <tr>
                        <td>${emp.id}</td>
                        <td>${emp.lastName}</td>
                        <td>${emp.email}</td>
                        <td>${emp.gender==0?'female':'male'}</td>
                        <td>${emp.department.departementName}</td>
                        <td><a href="">Edit</a></td>
                        <td><a href="">Delete</a></td>
                       
                    </tr>
            
            </c:forEach>
    </table>
    </c:if>
  </body>
</html>