基于SpringMVC的Restful风格的CRUD操作

Restful风格 是一种比较流行的软件架构风格和开发方式。
源码下载地址：
**链接：**https://pan.baidu.com/s/1plbpUpeQt4-LANVoAPlvKQ
提取码：zhro

使用须知：
首先我是用了maven做的，我的链接里面也有两个项目，分别是maven的和springmvc的，如果是在springmvc下用的话也差不多。

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源码操作步骤（简述）：

（1）首先运行项目，显示一个起始界面。

（2）在地址栏输入设置的url地址list进行界面跳转，显示后台设置的数据。

（3）点击id为1003的删除按钮，删除数据。（F5刷新）

（4）点击添加按钮跳转到添加数据的界面，输入相应数据保存数据。


（5）点击id为1001的修改按钮，跳转到修改界面，修改它的数据。

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源码分析：

它的基本思路就是定义javabean存储数据，在dao层做相关crud操作，在controller那里调用方法去执行它，list界面做了一个根据id提交表单，在controller有相应的url跳转，add界面和edit界面类似，获取数据保存到绘画中去再读取出来，主要注意的就是url的路径。
我们学习的过程中肯定会遇到许多问题，培养自学能力和有一颗想进步的心是非常重要的。
结构目录：

（1）首先肯定要做一个pojo类来存数据，就是一个普通的javabean。
User.java

package com.qfedu.springmvc.pojo;

public class User {
	private Integer id;
	private String username;
	private String password;
	private String email;
	private Integer age;
	private Address address;
	public User() {
		super();
		// TODO Auto-generated constructor stub
	}
	
	
	public User(Integer id, String username, String password, String email, Integer age, Address address) {
		super();
		this.id = id;
		this.username = username;
		this.password = password;
		this.email = email;
		this.age = age;
		this.address = address;
	}



	public Integer getId() {
		return id;
	}

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

	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public Address getAddress() {
		return address;
	}
	public void setAddress(Address address) {
		this.address = address;
	}

	@Override
	public String toString() {
		return "User [id=" + id + ", username=" + username + ", password=" + password + ", email=" + email + ", age="
				+ age + ", address=" + address + "]";
	}
}

Address.java

package com.qfedu.springmvc.pojo;

public class Address {
	
	private Integer id;
	private String province;
	private String city;
	
	
	public Address(Integer id, String province, String city) {
		super();
		this.id = id;
		this.province = province;
		this.city = city;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getProvince() {
		return province;
	}
	public void setProvince(String province) {
		this.province = province;
	}
	public String getCity() {
		return city;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public Address() {
		super();
		// TODO Auto-generated constructor stub
	}
	@Override
	public String toString() {
		return "Address [id=" + id + ", province=" + province + ", city=" + city + "]";
	}
}

（2）配置dao层
这里采用静态方式事先存一些数据进去，因为没有使用数据库，全部存在绘画里。并调用一些系统的方法来为crud操作做准备。

package com.qfedu.springmvc.dao;

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

import org.springframework.stereotype.Repository;

import com.qfedu.springmvc.pojo.Address;
import com.qfedu.springmvc.pojo.User;


@Repository
public class Userdao {
	private static Map<Integer,User> users=null;
	
	static {
		users=new HashMap<Integer, User>();
		
		users.put(1001,new User(1001,"l1","123","[email protected]",13,new Address(1,"广西","南宁")));
		users.put(1002,new User(1002,"l2","123","[email protected]",14,new Address(2,"广东","广州")));
		users.put(1003,new User(1003,"l3","123","[email protected]",15,new Address(3,"贵州","贵阳")));
	}
	
	private static Integer intId=1004;
	
	public void save(User user) {
		if(user.getId()==null) {
			user.setId(intId++);
		}
		users.put(user.getId(), user);
	}
	
	public Collection<User> getAll(){
		return users.values();
	}
	
	public User get(Integer id) {
		return users.get(id);
	}
	
	public void delete(Integer id) {
		users.remove(id);
	}
	
}

（3）配置Controller，没有定义servlet，直接在这里一起操作了。

package com.qfedu.springmvc.controller;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
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.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;

import com.qfedu.springmvc.dao.Userdao;
import com.qfedu.springmvc.pojo.Address;
import com.qfedu.springmvc.pojo.User;

@Controller
//把存入user的值放进session中，规定存进去的值是String类型
@SessionAttributes(value = {"user"},types = {String.class})
public class UserController {
	
	@Autowired
	private Userdao userDao;
	
	///////////////////////////////////////////////////
	
	
	@RequestMapping(value = "/list",method = RequestMethod.GET)
	public String list(Model m) {
		Collection<User> mo=userDao.getAll();
		m.addAttribute("mo", mo);
		return "user/list";
	}
	
	@RequestMapping(value = "/{id}",method =RequestMethod.DELETE)
	public String delete(@PathVariable(value="id") Integer id) {
		System.out.println("delete" + id);
		userDao.delete(id);
		return "redirect:/list";
	}
	
	@RequestMapping(value = "/add",method =RequestMethod.GET)
	public String add() {
		System.out.println("add");
		return "user/add";
	}
	
	@RequestMapping(value = "/",method =RequestMethod.POST)
	public String save1(User user) {
		System.out.println("save1");
		userDao.save(user);
		return "redirect:/list";
	}
	
	@RequestMapping(value = "/{id}",method =RequestMethod.GET)
	public String edit10(@PathVariable(value="id") Integer id,Model c) {
		System.out.println("edit");
		User user= userDao.get(id);
		c.addAttribute("user", user);
		return "user/edit";
	}
	
	@RequestMapping(value = "/{id}",method =RequestMethod.PUT)
	public String update(@PathVariable(value="id") Integer id,User user) {
		System.out.println("update");
		user.setId(id);
		userDao.save(user);
		return "redirect:/list";
	}
}

（4）几个显示数据的jsp页面（忽略home.jsp）
list,jsp

<%@page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>用户列表</h1>
<a href="add">添加</a>
<table border="1">
	<tr>
		<td>id</td>
		<td>姓名</td>
		<td>年龄</td>
		<td>省份</td>
		<td>城市</td>
		<td>操作</td>
	</tr>
	<c:forEach items="${mo}" var="user">
	<tr>
		<td>${user.id}</td>
		<td>${user.username}</td>
		<td>${user.age}</td>
		<td>${user.address.province}</td>
		<td>${user.address.city}</td>
		<td>
		<a href="javascript:void(0)" onclick="deteteById(${user.id})">删除</a>
		<a href="${user.id}">修改</a>
		</td>
	</tr>
	</c:forEach>
</table>



<form action="1" method="post" id="d1">
	<input type="text" name="_method" value="DELETE"/>
	<button>DELETE提交</button>
</form>
<form action="1" method="post" id="d2">
	<input type="text" name="_method" value="PUT"/>
	<button>PUT提交</button>
</form>

<script>
function deteteById(id){
	var form=document.getElementById('d1');
	form.action = id;
	document.getElementById('d1').submit();
}
function updateById(id){
	var form=document.getElementById('d2');
	form.action = id;
	document.getElementById('d2').submit();
}
</script>
</body>
</html>

add.jsp

<%@page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/" method="post">
<label for="">用户名:  <input type="text" name="username" value="${user.username}" /></label><br />
<label for="">密码:  <input type="password" name="password" value="${user.password}"/></label><br />
<label for="">邮箱:  <input type="text" name="email" value="${user.email}"/></label><br />

<!-- value="${sessionScope.user.age} 从session中取出数据 -->
<label for="">年龄:  <input type="text" name="age" value="${sessionScope.user.age}"/></label><br />

<label for="">省份:  <input type="text" name="address.province" value="${user.address.province}"/></label><br />
<label for="">城市:  <input type="text" name="address.city" value="${user.address.city}"/></label><br />
<button>保存</button>
</form>
</body>
</html>

edit.jsp

<%@page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/${user.id}" method="post">
<input type="hidden" name="_method" value="PUT"/>
<!--<input type="hidden" name="id" value="${user.id }"/>-->

<label for="">用户名:  <input type="text" name="username" value="${user.username}" /></label><br />
<label for="">密码:  <input type="password" name="password" value="${user.password}"/></label><br />
<label for="">邮箱:  <input type="text" name="email" value="${user.email}"/></label><br />

<!-- value="${sessionScope.user.age} 从session中取出数据 -->
<label for="">年龄:  <input type="text" name="age" value="${sessionScope.user.age}"/></label><br />

<label for="">省份:  <input type="text" name="address.province" value="${user.address.province}"/></label><br />
<label for="">城市:  <input type="text" name="address.city" value="${user.address.city}"/></label><br />
<button>保存</button>
</form>
</body>
</html>

（5）其他的一些基本配置文件
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" version="2.5">
  <display-name>springmvc-04-mvc</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
    <servlet>
  <servlet-name>springMVC</servlet-name>
  <!-- 请求触发器 -->
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <init-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:springMVC-servlet.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup><!-- 提前启动 -->
  </servlet>
  
  <servlet-mapping>
    <servlet-name>springMVC</servlet-name>
    <url-pattern>/</url-pattern>
    <!-- 或*.action -->
  </servlet-mapping>
  
  <!-- 解决springMVC的post乱码 -->
  <filter>  
        <filter-name>encodingFilter</filter-name>  
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
        <init-param>  
            <param-name>encoding</param-name>  
            <param-value>UTF-8</param-value>  
        </init-param>  
        <init-param>  
            <param-name>forceEncoding</param-name>  
            <param-value>true</param-value>  
        </init-param>  
    </filter>  
    <filter-mapping>  
        <filter-name>encodingFilter</filter-name>  
        <url-pattern>/*  
    
    
    
        
        HiddenHttpMethodFilter
        org.springframework.web.filter.HiddenHttpMethodFilter
    
    
        HiddenHttpMethodFilter
        
        /*
    

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.qfedu</groupId>
  <artifactId>springmvc-04-mvc</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  
  
  <dependencies>
  <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
  <version>5.1.5.RELEASE</version>
  </dependency>
  
  <!-- 引入标签库 -->
  <dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
  
  
  
  <!-- 引入servlet-api和jsp-api -->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.0.1</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.2</version>
    <scope>provided</scope>
</dependency>

  </dependencies>
  <build>
  <plugins>
    <!-- java编译插件 -->
		<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.7.0</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
			
			  <!-- tomcat插件 -->
			  <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <configuration>
                    <port>8001</port>
                    <path>/mvc</path>
                </configuration>
            </plugin>
  </plugins>
  </build>
</project>

springMVC-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       
       xsi:schemaLocation="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.xsd">
        
       <!--  配置controller层路径扫描  com.qfedu.springmvc.controller  -->
       <context:component-scan base-package="com.qfedu.springmvc.controller"></context:component-scan>
       
       <!--  扫描dao -->
       <context:component-scan base-package="com.qfedu.springmvc.dao"></context:component-scan>
       
       
       <!-- 视图解析器 -->
       <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/" />
        <!-- 后缀 -->
        <property name="suffix" value=".jsp" />
       </bean>
</beans>