SpringMVC(三十) 实例：SpringMVC_RESTRUL_CRUD_显示所有员工信息
Step by step to create a springMVC demo.
1. 创建一个dynamic web 工程。
2. 添加需要的jar文件,如下图：
3. 配置web.xml：配置dispatcher servlet; 配置hiddenhttpmethod
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<?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_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>Curd</display-name> <!-- 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> <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></web-app> |
4. 创建SpringMVC.xml，创建Spring Bean Configuration file. 选中bean, context, mvc命名空间。
5. 编辑springmvc.xml文件。配置context:component-scan 和 InternalResourceViewResolver
<?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:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.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-4.3.xsd">
<!-- autoScanComponent -->
<context:component-scan base-package="com.atguigu.springmvc"></context:component-scan>
<!-- 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>
</beans>
6.其它文件结构图如下：
7. 创建index.jsp文件。内容如下：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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>
<a href="listAllEmployees">list all employees</a>
</body>
</html>
8. 创建entity和service Dao。entity定义了对象结构。service dao定义了对象业务操作行为，如创建，查询和删除。
Department类：
package com.atguigu.springmvc.entities;
public class Department {
private Integer id;
private String departmentName;
public Department(Integer id, String departmentName) {
super();
this.id = id;
this.departmentName = departmentName;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getDepartmentName() {
return departmentName;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
}
Employee类：
package com.atguigu.springmvc.entities;
import java.util.Date;
public class Employee {
private Integer id;
private String lastname;
private String email;
private Integer gender;
private Department department;
private Date birth;
private Float salary;
public Employee(Integer id, String lastname, String email, Integer gender, Department department, Date birth,
Float salary) {
super();
this.id = id;
this.lastname = lastname;
this.email = email;
this.gender = gender;
this.department = department;
this.birth = birth;
this.salary = 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 Department getDepartment() {
return department;
}
public void setDepartment(Department department) {
this.department = department;
}
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;
}
}
9. Dao类 demo代码如下：
DepartmentDao:
package com.atguigu.springmvc.dao;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Repository;
import com.atguigu.springmvc.entities.Department;
@Repository
public class DepartmentDao {
private static Map<Integer, Department> departments = null;
static{
departments = new HashMap<>();
departments.put(101, new Department(101,"D-AA"));
departments.put(102, new Department(101,"D-AA"));
departments.put(103, new Department(101,"D-AA"));
departments.put(104, new Department(101,"D-AA"));
departments.put(105, new Department(101,"D-AA"));
}
public Collection<Department> getDepartment(Integer id) {
System.out.println(departments.values().getClass());
System.out.println(departments.values());
return departments.values();
}
}
EmployeeDao:
package com.atguigu.springmvc.dao;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.atguigu.springmvc.entities.Department;
import com.atguigu.springmvc.entities.Employee;
@Repository
public class EmployeeDao {
private static Map<Integer, Employee> employess = null;
@Autowired
private DepartmentDao departmentDao;
static{
employess = new HashMap<>();
employess.put(1001, new Employee(1001,"E-AA", "aa@163.com", 1, new Department(101, "D-AA"), new Date(), (float) 123));
employess.put(1002, new Employee(1002,"E-AA", "aa@163.com", 1, new Department(102, "D-AA"), new Date(), (float) 124));
employess.put(1003, new Employee(1003,"E-AA", "aa@163.com", 1, new Department(103, "D-AA"), new Date(), (float) 125));
employess.put(1004, new Employee(1004,"E-AA", "aa@163.com", 1, new Department(104, "D-AA"), new Date(), (float) 126));
employess.put(1005, new Employee(1005,"E-AA", "aa@163.com", 1, new Department(105, "D-AA"), new Date(), (float) 127));
}
public Collection<Employee> getAll() {
return employess.values();
}
}
10. 通过Controller控制listAllEmployees action的视图返回，在该controller方法中，把所有的employess对象通过一个集合的方式传到视图中，视图可以通过获取该session attribute，从而获取相关数据。
package com.atguigu.springmvc.handlers;
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.atguigu.springmvc.dao.EmployeeDao;
@Controller
public class ListEmployees {
@Autowired
private EmployeeDao employeeDao;
@RequestMapping("listAllEmployees")
public String listAllEmployees(Map<String,Object> map) {
map.put("employees",employeeDao.getAll());
return "list";
}
}
11. 上面代码使返回视图为list.jsp。
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ 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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>hello world</h1>
<c:if test="${empty requestScope.employees }">
<h1>no employee</h1>
</c:if>
<c:if test="${!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.departmentName }</td>
<td><a href="">Edit</a></td>
<td><a href="">Delete</a></td>
</tr>
</c:forEach>
</table>
</c:if>
</body>
</html>
12. 完成以上代码后，可以执行测试。
https://github.com/godmaybelieve
