SpringMVC結合REST實現入門級的CRUD

jopen 11年前發布 | 60K 次閱讀 SpringMVC Spring MVC Web框架
這是一個WebProject，用到的是spring-framework-3.1.1.RELEASE
首先是web.xml（最終應用訪問地址為http://IP:port/contextPath/user/add）
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee 
    ;
  <servlet>
        <servlet-name>user</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>user</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

<filter>
    <filter-name>SpringCharacterEncodingFilter</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>
</filter>
<filter-mapping>
    <filter-name>SpringCharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

</web-app></pre>

然后是SpringMVC的配置文件user-servlet.xml


<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans 
                        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
                        http://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
                        http://www.springframework.org/schema/context 
                        ;
    <context:component-scan base-package="com.jadyer"/>

<mvc:annotation-driven/>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <property name="suffix" value=".jsp"/>
</bean>

</beans></pre>

用來添加用戶信息的//WEB-INF//jsp/user/add.jsp</strong></span>  


<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="form" uri=";
<%-- 這里并沒有指定action=""，說明表單是提交給自己的，說白了就是"哪來的回哪兒去 --%>
<form:form method="POST" modelAttribute="user">
    username: <form:input path="username"/><br/>
    nickname: <form:input path="nickname"/><br/>
    password: <form:password path="password"/><br/>
    yourmail: <form:input path="email"/><br/>
    <input type="submit" value="添加新用戶"/>
</form:form></pre>

用來列出所有用戶信息的//WEB-INF//jsp/user/list.jsp</strong></span>  


<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:forEach items="${users}" var="user">
    ${user.value.username}----${user.value.nickname}----${user.value.password}----${user.value.email}
        <a href="<%=request.getContextPath()%>/user/${user.value.username}">查看</a>
        <a href="<%=request.getContextPath()%>/user/${user.value.username}/update">編輯</a>
        <a href="<%=request.getContextPath()%>/user/${user.value.username}/delete">刪除</a>
    <br/>
</c:forEach>
<br/>
<a href="<%=request.getContextPath()%>/user/add">繼續添加用戶</a>


用來顯示單個用戶信息的//WEB-INF//jsp/user/show.jsp</strong></span>  


<%@ page language="java" pageEncoding="UTF-8"%>
${user.username}----${user.nickname}----${user.password}----${user.email}
<br/>
<br/>
<a href="<%=request.getContextPath()%>/user/add">繼續添加用戶</a>


用來更新單個用戶信息的//WEB-INF//jsp/user/update.jsp</strong></span>  


<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<form:form method="POST" modelAttribute="user">
    username: <form:input path="username"/><br/>
    nickname: <form:input path="nickname"/><br/>
    password: <form:password path="password"/><br/>
    yourmail: <form:input path="email"/><br/>
    <input type="submit" value="更新用戶信息"/>
</form:form>


下面是用戶的實體類User.java</strong></span>  


package com.jadyer.model;
/**

User
@author http://blog.csdn.net/jadyer
@create May 12, 2012 1:24:43 AM
*/
public class User {
 private String username;
 private String nickname;
 private String password;
 private String email;
public User() {}
 public User(String username, String nickname, String password, String email) {

 this.username = username;
 this.nickname = nickname;
 this.password = password;
 this.email = email;

}
public String getUsername() {

 return username;

}
 public void setUsername(String username) {

 this.username = username;

}
 public String getNickname() {

 return nickname;

}
 public void setNickname(String nickname) {

 this.nickname = nickname;

}
 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;

}
}</pre>

最后是核心的UserController.java</strong></span>
package com.jadyer.controller;


import java.util.HashMap;
import java.util.Map;
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 com.jadyer.model.User;
/**

UserController
@author http://blog.csdn.net/jadyer
@create May 12, 2012 1:26:21 AM
*/
@Controller
@RequestMapping("/user")
public class UserController {
 private final static Map<String,User> users = new HashMap<String,User>();
//模擬數據源,構造初始數據
 public UserController(){

 users.put("張起靈", new User("張起靈", "悶油瓶", "02200059", "menyouping@yeah.net"));
 users.put("李尋歡", new User("李尋歡", "李探花", "08866659", "lixunhuan@gulong.cn"));
 users.put("拓拔野", new User("拓拔野", "搜神記", "05577759", "tuobaye@manhuang.cc"));
 users.put("孫悟空", new User("孫悟空", "美猴王", "03311159", "sunhouzi@xiyouji.zh"));

}
/**

添加新用戶
@see 訪問/user/add時，GET請求就執行addUser(Model model)方法，POST請求就執行addUser(User user)方法
*/
@RequestMapping(value="/add", method=RequestMethod.GET)
public String addUser(Model model){
 //這里要傳給前臺一個空對象，否則會報告java.lang.IllegalStateException異常
 //異常信息為Neither BindingResult nor plain target object for bean name 'user' available as request attribute
 //并且傳過去的key值要與前臺modelAttribute屬性值相同，即model.addAttribute("user", new User());
 //我們也可以寫成下面這種方式，此時SpringMVC會自動把對象名轉換為小寫值作為key，即User-->user
 model.addAttribute(new User());
 return "user/add";
}
@RequestMapping(value="/add", method=RequestMethod.POST)
public String addUser(User user){ //這里參數中的user就應該與add.jsp中的modelAttribute="user"一致了
 users.put(user.getUsername(), user);
 return "redirect:/user/list";
}
/**

列出所有用戶信息
*/
@RequestMapping("/list")
public String list(Model model){
 model.addAttribute("users", users);
 return "user/list";
}
/**

查詢用戶信息
@see 訪問該方法的路徑就應該是"/user/具體的用戶名"
@see 這里value="/{username}"的寫法，需要格外注意一下，它是一個路徑變量，此時用來接收前臺的一個資源
@see 這時value="/{username}"就會到方法參數中找@PathVariable String username，并將路徑變量值傳給username參數
*/
@RequestMapping(value="/{myname}", method=RequestMethod.GET)
public String show(@PathVariable String myname, Model model){
 model.addAttribute(users.get(myname));
 return "user/show";
}
/**

編輯用戶信息
@see 訪問該方法的路徑就應該是"/user/具體的用戶名/update"
*/
@RequestMapping(value="/{myname}/update", method=RequestMethod.GET)
public String update(@PathVariable String myname, Model model){
 model.addAttribute(users.get(myname));
 return "user/update";
}
@RequestMapping(value="/{myname}/update", method=RequestMethod.POST)
public String update(User user){
 users.put(user.getUsername(), user);
 return "redirect:/user/list"; //也可以retun "forward:/user/list",此時瀏覽器地址欄會有不同
}
/**

刪除用戶信息
*/
@RequestMapping(value="/{myname}/delete", method=RequestMethod.GET)
public String delete(@PathVariable String myname){
 users.remove(myname);
 return "redirect:/user/list"; //刪除完成后顯示當前存在的所有用戶信息
}
}</pre>來自：http://blog.csdn.net/jadyer/article/details/7574659
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SpringMVC Spring MVC Web框架
SpringMVC結合REST實現入門級的CRUD

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