Struts2 json plugin实战2

最新推荐文章于 2017-08-08 16:13:47 发布

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最新推荐文章于 2017-08-08 16:13:47 发布

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本文介绍如何在 Struts2 框架中使用 JSON 插件实现数据交互。从添加依赖、创建 Action 类及 User 类，到配置 Spring 和 Struts2，最后通过 JSP 测试 JSON 数据返回。

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1. 首先是在struts2的工程里添加struts2-json-plugin.xxx.jar库，如果是使用的maven，添加以下dependency

<dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-json-plugin</artifactId> <version>2.1.8.1</version> </dependency>

2. 创建Action类和一个用到的User类

Action类内容

import com.opensymphony.xwork2.Action; import java.util.ArrayList; import java.util.LinkedHashMap; import java.util.List; import java.util.Map; public class JSONExample2 { private List<User> userList = new ArrayList<User>(); private Map<String, User> userMap = new LinkedHashMap<String, User>(); public String getMyUserList() { for (int i = 0; i < 3; i++) { User user = new User("id_" + i, "username_" + i, "password_" + i, "desc_" + i); userList.add(user); } return Action.SUCCESS; } public String getMyUserMap() { for (int i = 0; i < 3; i++) { User user = new User("id_" + i, "username_" + i, "password_" + i, "desc_" + i); userMap.put(user.getId(), user); } return Action.SUCCESS; } public List<User> getUserList() { return userList; } public void setUserList(List<User> userList) { this.userList = userList; } public Map<String, User> getUserMap() { return userMap; } public void setUserMap(Map<String, User> userMap) { this.userMap = userMap; } }

User类内容

import java.io.Serializable; public class User implements Serializable { private static final long serialVersionUID = 1L; private String id; private String username; private String password; private String description; public User() { } public User(String id, String username, String password, String description) { this.id = id; this.username = username; this.password = password; this.description = description; } public String getId() { return id; } public void setId(String 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 getDescription() { return description; } public void setDescription(String description) { this.description = description; } }

3. Spring配置文件

<?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:aop="http://www.springframework.org/schema/aop" xmlns:lang="http://www.springframework.org/schema/lang" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd" default-lazy-init="true"> <bean id="jsonExample2" class="JSONExample2" scope="prototype"/> </beans>

4. Struts2配置文件

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <include file="struts-default.xml" /> <package name="json" namespace="/json" extends="struts-default" > <result-types> <result-type name="json" class="org.apache.struts2.json.JSONResult"/> </result-types> <interceptors> <interceptor name="json" class="org.apache.struts2.json.JSONInterceptor"/> </interceptors> <action name="getMyUserList" class="jsonExample2" method="getMyUserList"> <result type="json"> <param name="root">userList</param> </result> </action> <action name="getMyUserMap" class="jsonExample2" method="getMyUserMap"> <result type="json"> <param name="root">userMap</param> </result> </action> </package> </struts>

5. 新建一个jsp文件json.jsp用来做测试

<html> <head> <title></title> <mce:script type="text/javascript" src="http://www.google.com/jsapi?key=helloworld" mce_src="http://www.google.com/jsapi?key=helloworld"></mce:script> <mce:script type="text/javascript"></mce:script> </head> <body style="margin: 20px;" mce_style="margin: 20px;"> <h3>json test</h3> <ul> <li><a href="#" mce_href="#" onclick="getMyUserList()">getMyUserList</a></li> <li><a href="#" mce_href="#" onclick="getMyUserMap()">getMyUserMap</a></li> </ul> </body> </html>

6. 启动web容器测试，可以使用Tomcat或者maven自带的jetty，然后访问

http://localhost:8080/json/json.jsp

此时可以点击页面上的两个链接来测试结果。

参考：https://cwiki.apache.org/confluence/display/WW/JSON%20Plugin