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 serializedprivate transient String field2 = "field2";//fields without getter method are not serializedprivate 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。