SpringMVC(三十) 实例：SpringMVC_RESTRUL_CRUD

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

<?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>

<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。

巴特西

SpringMVC(三十) 实例：SpringMVC_RESTRUL_CRUD_显示所有员工信息

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