maven工程中,spring mvc @ResponseBody的使用

1.配置web.xml文件(确保已经导入了spring中的jar包)

<?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">
    <display-name>springmvc</display-name>
    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <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>/*</url-pattern>
    </filter-mapping>

</web-app>

2.注意到上面的橙红色代码：

<servlet-name>spring</servlet-name>
在默认情况下我们还需要一个 "xxx-servlet.xml" 文件，"xxx"就是<servlet-name>标签中的spring，所以我们需要的文件为(在WEB-INF文件夹下)：spring-servlet.xml

3.spring-servlet.xml的配置如下：

<?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:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:mvc="http://www.springframework.org/schema/mvc"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
    <!-- 自动扫描的包名,我的是com.lxw.controller -->
    <context:component-scan base-package="com.lxw.controller" ></context:component-scan>
    <!-- 默认的注解映射的支持 -->
    <mvc:annotation-driven />
</beans> 

4.在pom.xml中加入如下依赖：

<dependency> 
<groupId>org.codehaus.jackson</groupId> 
<artifactId>jackson-core-asl</artifactId> 
<version>1.8.5</version> 
</dependency> 
<dependency> 
<groupId>org.codehaus.jackson</groupId> 
<artifactId>jackson-mapper-asl</artifactId> 
<version>1.8.5</version> 
</dependency> 

 

5.Java代码：

 1 package com.lxw.controller;
 2 
 3 import java.util.LinkedList;
 4 import java.util.List;
 5 
 6 import org.springframework.stereotype.Controller;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import org.springframework.web.bind.annotation.ResponseBody;
 9 
10 @Controller
11 public class ResponseBodyAnnotation {
12     @RequestMapping(value="/topics/json")
13     @ResponseBody
14     public List<Topic> getTextString(){
15         System.out.println("Annotation response");
16         LinkedList<Topic> topics = new LinkedList<Topic>();
17         topics.add(new Topic("a"));
18         topics.add(new Topic("b"));
19         topics.add(new Topic("c"));
20         topics.add(new Topic("d"));
21         topics.add(new Topic("e"));
22         return topics;
23     }
24     class Topic{
25         private String id;
26         public String getId() {
27             return id;
28         }
29 
30         public void setId(String id) {
31             this.id = id;
32         }
33 
34         public int getFlag() {
35             return flag;
36         }
37 
38         public void setFlag(int flag) {
39             this.flag = flag;
40         }
41 
42         private int flag = 0;
43 
44         public Topic(String id) {
45             this.id = id;
46         }
47 
48         @Override
49         public boolean equals(Object obj) {
50             return this.id.equals(((Topic) obj).getId());
51         }
52     }
53 }

View Code

 

6.运行！然后在浏览器中输入："http://localhost:port/projectname/topics/json" , port为端口号,projectname为项目名称.

7.运行过程中如果出现406错误,则可能是没导入json的jar包.http://pan.baidu.com/s/1gdqwNUb(该链接如果失效,请另想办法).