Struts2 json plugin实战2

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"><!--
            google.load("jquery", "1.4.1");
             
            function getMyUserList() {
                var url = 'json/getMyUserList.action';
                var params = {
                };
                jQuery.post(url, params, function(data) {
                    var s = "";
                    for (var idx = 0; idx < data.length; idx++) {
                        s += "user["+idx+"].id=" + data[idx].id + "/n";
                    }
                    alert(s);
                }, 'json');
            }
            function getMyUserMap() {
                var url = 'json/getMyUserMap.action';
                var params = {
                };
                jQuery.post(url, params, function(data) {
                    var s = "";
                    for (var o in data) {
                        s += "user.id=" + data[o].id + ",";
                        s += "user.username=" + data[o].username + "/n";
                    }
                    alert(s);
                }, 'json');
            }
         
// --></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。

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