Struts2 json plugin实战1

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.Calendar; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.struts2.json.annotations.JSON; public class JSONExample1 { private int[] ints = {10, 20}; private List<User> userList = new ArrayList<User>(); private Map<String, User> userMap = new HashMap<String, User>(); private Date date = Calendar.getInstance().getTime(); private String customName = "custom"; private String field1 = "field1"; //'transient' fields are not serialized private transient String field2 = "field2"; //fields without getter method are not serialized private String field3; public String execute() { for (int i = 0; i < 2; i++) { User user = new User("id_" + i, "username_" + i, "password_" + i, "desc_" + i); userList.add(user); userMap.put(user.getId(), user); } return Action.SUCCESS; } public int[] getInts() { return ints; } public void setInts(int[] ints) { this.ints = ints; } 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; } public Date getDate() { return date; } public void setDate(Date date) { this.date = date; } public String getField1() { return field1; } public void setField1(String field1) { this.field1 = field1; } public String getField2() { return field2; } public void setField2(String field2) { this.field2 = field2; } @JSON(name = "newCustomName") public String getCustomName() { return this.customName; } }  

 

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="jsonExample1" class="JSONExample1" 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="jsonExample1" class="jsonExample1"> <result type="json"/> </action> </package> </struts> 

 

5. 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/jsonExample1.action

  此时可以看到页面上会输出json格式的字符串。

 

注：这里可以安装一个Firefox的JSONView扩展，此时如果请求的页面输出是json的话就会以比较好的格式显示，对于chrome浏览器来说也有相类似的插件可以使用。