Gson操作

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本文主要总结对json的操作

用到struts2和gson2个包。

action为

package action;import java.util.ArrayList;import java.util.List;import javax.servlet.http.HttpServletResponse;import model.User;import org.apache.struts2.ServletActionContext;import com.google.gson.Gson;import com.google.gson.JsonElement;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class ListAction extends ActionSupport {private static final long serialVersionUID = 7514100921793771035L;private String name;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String execute() {return null;}public String Gson() throws Exception {HttpServletResponse response = (HttpServletResponse) ActionContext.getContext().get(ServletActionContext.HTTP_RESPONSE);response.setContentType("text/html;charset=UTF-8");User u1 = new User(1,"李文","aaa");User u2 = new User(2,"李二","eee");User u3 = new User(3,"李三","33a");User u4 = new User(4,"王四","bbb");List<User> list = new ArrayList<User> ();String newName = new String(name.getBytes("ISO-8859-1"),"UTF-8");System.out.println(name+"--"+age+"--"+newName+"--");list.add(u1);list.add(u2);list.add(u3);list.add(u4);Gson gson = new Gson();JsonElement element = gson.toJsonTree(list);String json = gson.toJson(element);response.getWriter().print(json);System.out.println(json);return null;}}

struts.xml为：

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"><struts><constant name="struts.devMode" value="true" /><constant name="struts.i18n.encoding" value="UTF-8" /><package name="myDemo" extends="struts-default" namespace="/"><action name="lists" class="action.ListAction" method="Gson"></action><action name="*"><result>/{1}.jsp</result></action></package></struts>

jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>My JSP 'index.jsp' starting page</title>    <meta http-equiv="Content-Type" content="text/html;UTF-8"><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><script type="text/javascript" src="js/jquery-1.7.2.js"></script><script type="text/javascript">var msg = "";$(document).ready(function(){$.getJSON("lists.action",{name:"你好", age:"3" },function(data){$.each(data,function(i,temp){msg += "id=" + temp.userId+";name="  + temp.userName+";password="  + temp.passWord+";\n";$("p").append(temp.userId).append(temp.userName).append(temp.passWord).append("\n");});alert(msg);});});</script>  </head>    <body>    aaaaaaaaaa    <hr/>  <p></p>  </body></html>

结果如下：

总结：

js传参数有乱码问题：

解决：服务端即action里对参赛进行编码更换，与get方法解决乱码一样

从服务端获取的json数据出现中文乱码：

解决： response.setContentType("text/html;charset=UTF-8");

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