SpringMVC-7 RESTful CRUD

最新推荐文章于 2023-10-19 08:40:53 发布

原创最新推荐文章于 2023-10-19 08:40:53 发布 · 368 阅读

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本文介绍了一个基于Spring MVC的RESTful风格CRUD操作实例，详细展示了Department和Employee两个实体类的增删改查功能实现过程。

　　RESTful风格CRUD操作的具体实现代码下载地址：http://download.youkuaiyun.com/download/bingbeichen/9795651。

1. 具体需求

　　这里写图片描述

2. 代码结构

　　这里写图片描述

3. 具体实现

　　DepartmentDao.java：

package com.qiaobc.springmvc.dao;

import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

import org.springframework.stereotype.Repository;

import com.qiaobc.springmvc.domain.Department;

@Repository
public class DepartmentDao {

    private static Map<Integer, Department> depts = null;

    static {
        depts = new LinkedHashMap<Integer, Department>();

        depts.put(101, new Department(101, "dept-101"));
        depts.put(102, new Department(102, "dept-102"));
        depts.put(103, new Department(103, "dept-103"));
    }

    public Collection<Department> getDepartments(){
        return depts.values();
    }

    public Department getDepartment(Integer deptId) {
        return depts.get(deptId);
    }

}

　　EmployeeDao.java：

package com.qiaobc.springmvc.dao;

import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

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

import com.qiaobc.springmvc.domain.Department;
import com.qiaobc.springmvc.domain.Employee;

@Repository
public class EmployeeDao {

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

    static {
        emps = new LinkedHashMap<Integer, Employee>();

        emps.put(1001, new Employee(1001, "qiaobc1001", "qiaobc1001@163.com", "1", new Department(101, "dept-101")));
        emps.put(1002, new Employee(1002, "qiaobc1002", "qiaobc1002@163.com", "0", new Department(102, "dept-102")));
        emps.put(1003, new Employee(1003, "qiaobc1003", "qiaobc1003@163.com", "1", new Department(103, "dept-103")));
        emps.put(1004, new Employee(1004, "qiaobc1004", "qiaobc1004@163.com", "0", new Department(102, "dept-102")));
        emps.put(1005, new Employee(1005, "qiaobc1005", "qiaobc1005@163.com", "1", new Department(101, "dept-101")));
    }

    public Collection<Employee> getEmployees() {
        return emps.values();
    }

    private static Integer initId = 1006;

    @Autowired
    private DepartmentDao departmentDao;

    public void save(Employee employee) {
        if(employee.getId() == null) {
            employee.setId(initId++);
        }

        employee.setDept(departmentDao.getDepartment(employee.getDept().getDeptId()));
        emps.put(employee.getId(), employee);
    }

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

    public Employee get(Integer id) {
        return emps.get(id);
    }

}

　　Department.java：

package com.qiaobc.springmvc.domain;

public class Department {

    private Integer deptId;

    private String deptName;

    public Integer getDeptId() {
        return deptId;
    }

    public void setDeptId(Integer deptId) {
        this.deptId = deptId;
    }

    public String getDeptName() {
        return deptName;
    }

    public void setDeptName(String deptName) {
        this.deptName = deptName;
    }

    public Department(Integer deptId, String deptName) {
        super();
        this.deptId = deptId;
        this.deptName = deptName;
    }

    public Department() {
        super();
    }

    @Override
    public String toString() {
        return "Department [deptId=" + deptId + ", deptName=" + deptName + "]";
    }

}

　　Employee.java：

package com.qiaobc.springmvc.domain;

public class Employee {

    private Integer id;

    private String name;

    private String email;

    private String gender;

    private Department dept;

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

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

    public String getGender() {
        return gender;
    }

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

    public Department getDept() {
        return dept;
    }

    public void setDept(Department dept) {
        this.dept = dept;
    }

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

    public Employee() {
        super();
    }

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

}

　　EmployeeHandler.java：

package com.qiaobc.springmvc.handler;

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.qiaobc.springmvc.dao.DepartmentDao;
import com.qiaobc.springmvc.dao.EmployeeDao;
import com.qiaobc.springmvc.domain.Employee;

@Controller
public class EmployeeHandler {

    @Autowired
    private EmployeeDao employeeDao;

    @Autowired
    private DepartmentDao departmentDao;

    @RequestMapping(value="/emps", method=RequestMethod.GET)
    public String list(Map<String, Object> map) {
        map.put("employees", employeeDao.getEmployees());
        return "emp-list";
    }

    @RequestMapping(value="/emp", method=RequestMethod.GET)
    public String input(Map<String, Object> map) {
        map.put("employee", new Employee());
        map.put("departments", departmentDao.getDepartments());
        return "emp-edit";
    }

    @RequestMapping(value="/emp", method=RequestMethod.POST)
    public String save(Employee employee) {
        System.out.println(employee);
        employeeDao.save(employee);
        return "redirect:/emps";
    }

    @RequestMapping(value="/emp/{id}", method=RequestMethod.DELETE)
    public String delete(@PathVariable("id") Integer id) {
        employeeDao.delete(id);
        return "redirect:/emps";
    }

    @RequestMapping(value="/emp/{id}", method=RequestMethod.GET)
    public String input(Map<String, Object> map, @PathVariable(value="id") Integer id) {
        map.put("employee", employeeDao.get(id));
        map.put("departments", departmentDao.getDepartments());
        return "emp-edit";
    }

    @ModelAttribute
    public void getEmployee(@RequestParam(value="id", required=false) Integer id, Map<String, Object> map) {
        if(id != null) {
            map.put("employee", employeeDao.get(id));
        }
    }

    @RequestMapping(value="/emp", method=RequestMethod.PUT)
    public String update(Employee employee) {
        System.out.println(employee);
        employeeDao.save(employee);
        return "redirect:/emps";
    }

}

　　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: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-4.0.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-4.0.xsd">

    <!-- 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>

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

    <mvc:default-servlet-handler/>
    <mvc:annotation-driven></mvc:annotation-driven>

</beans>

　　emp-edit.jsp：

<%@page import="java.util.HashMap"%>
<%@page import="java.util.Map"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ 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>

    <!-- 
        SpringMVC的form标签可以更快速地开发表单页面，并实现表单的回显
        注意：
            可以通过modelAttribute属性指定所绑定的模型属性
            若未指定该属性，则默认从request域对象中获取名为command的表单Bean对象，若不存在则报错！
     -->
    <form:form action="${pageContext.request.contextPath }/emp" method="post" modelAttribute="employee">
        <!-- path属性对应HTML表单标签的name属性值 -->
        <c:if test="${!empty id }">
            <form:hidden path="id"/>
            <input type="hidden" name="_method" value="PUT">
            Name:<form:input path="name" disabled="true"/>
        </c:if>
        <c:if test="${empty id }">
            Name:<form:input path="name"/>
        </c:if>
        <br><br>

        Email:<form:input path="email"/><br><br>
        <%
            Map<String, String> genders = new HashMap<String, String>();
            genders.put("1", "Male");
            genders.put("0", "Female");
            request.setAttribute("genders", genders);
        %>
        Gender:<form:radiobuttons path="gender" items="${genders }"/><br><br>
        Department:<form:select path="dept.deptId" items="${departments }" 
            itemLabel="deptName" itemValue="deptId" ></form:select><br><br>
        <input type="submit" name="submit">
    </form:form>

</body>
</html>

　　emp-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>

<!-- 
    关于SpringMVC处理静态资源的问题：
        1). DispatcherServlet的请求映射配置为“/”，即SpringMVC将捕获WEB容器的所有请求
        2). 静态资源的请求如scripts/jquery-1.7.2.js会被捕获，会因找不到对应处理器将导致错误
        3). 而优雅的REST风格的资源URL不希望带.do等后缀，即不能使用“/*.do”
    解决办法:
        1). 在SpringMVC配置文件中，配置<mvc:default-servlet-handler/>
        2). 且需要配置<mvc:annotation-driven></mvc:annotation-driven>
 -->
<script type="text/javascript" src="scripts/jquery-1.7.2.js"></script>
<script type="text/javascript">
    $(function() {
        $(".delete").click(function(){
            var href = $(this).attr("href");
            $("form").attr("action", href).submit();
            return false;
        });
    });
</script>

<body>

    <form action="" method="post">
        <input type="hidden" name="_method" value="DELETE">
    </form>

    <c:if test="${empty requestScope.employees }">
        对不起，暂没有员工信息！
    </c:if>
    <c:if test="${!empty requestScope.employees }">
        <table border="1" cellpadding="10" cellspacing="0">
            <tr>
                <th>ID</th>
                <th>NAME</th>
                <th>EMAIL</th>
                <th>GENDER</th>
                <th>DEPARTMENT</th>
                <th>DELETE</th>
                <th>EDIT</th>
            </tr>
            <c:forEach items="${requestScope.employees }" var="emp">
                <tr>
                    <td>${emp.id }</td>
                    <td>${emp.name }</td>
                    <td>${emp.email }</td>
                    <td>${emp.gender == "1" ? "Female" : "Male" }</td>
                    <td>${emp.dept.deptName }</td>
                    <td><a href="emp/${emp.id }" class="delete">Delete</a></td>
                    <td><a href="emp/${emp.id }">Edit</a></td>
                </tr>
            </c:forEach>
        </table>
    </c:if>

</body>
</html>

　　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SpringMVC所需要的DispatcherServlet -->
    <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>

    <!-- 配置可以拦截的请求对象 -->
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 配置HiddenHttpMethodFilter：将POST请求转换为DELETE或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>

</web-app>

　　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">
<title>Insert title here</title>
</head>
<body>

    <!-- 显示所有员工信息的请求：HTTP GET -->
    <a href="emps">List All Employees!</a>
    <br><br>

    <!-- 添加新的员工信息的请求：HTTP GET -->
    <a href="emp">Add New Employee!</a>
    <br><br>

</body>
</html>