ajax異步傳遞json
最快在做項目時，遇到了這樣的問題，瀏覽器通過ajax方式異步傳遞JSON交互問題，會出現各種問題。經過幾天的搜索，終於得到解決~
jsp頁面:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'ajaxTest.jsp' starting page</title>
<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="scripts/jquery-1.9.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$(".submit").click(function(){
$.ajax({
url:"getJsonAction2",
type:"POST",
dataType:"json",
contentType:"application/json;charset=utf-8",
success:function(returnData,status)
{
person1= returnData[0];
person2= returnData[1];
alert(person1.username);
alert(person2.username);
}
});
});
});
</script>
</head>
<body>
<input type="submit" value="getJson" class="submit" >
</body>
</html>Action代碼:
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.google.gson.Gson;
import com.opensymphony.xwork2.ActionSupport;
public class GetAjaxAction extends ActionSupport
{
@Override
public String execute() throws Exception
{
Person person1 = new Person();
person1.setUsername("zhangsan");
person1.setPassword("123456");
person1.setAge(16);
person1.setAddress("beijing");
Person person2 = new Person();
person2.setUsername("lisi");
person2.setPassword("123456");
person2.setAddress("shanghai");
person2.setAge(20);
ArrayList<Person> list= new ArrayList<Person>();
list.add(person1);
list.add(person2);
Gson gson= new Gson();
String result = gson.toJson(list);
System.out.println(result);
HttpServletResponse response =ServletActionContext.getResponse();
PrintWriter out= response.getWriter();
out.println(result);
out.flush();
out.close();
return null;
}
} <action name="getJsonAction2" class="com.fileupload.GetAjaxAction"></action>
結果頁面:
返回的JSON的對象數組，這樣就可以解決很多問題了~當然也可以從jsp傳送數據到服務端，比$.ajax更好用的方法還有$.post()和$.load()，但都基於ajax()方法實現的，而且ajax()方法還有很多可選的參數,有興趣的可以自己練習用下~