本文主要介紹了ajax用json實現資料傳輸的方法,具有很好的參考價值。下面一起來看看吧
JSON(JavaScript Object Notation) 是一種輕量級的資料交換格式。它是基於ECMAScript的一個子集。 JSON採用完全獨立於語言的文字格式,但也使用了類似C語言家族的習慣(包括C、C 、C#、Java、JavaScript、Perl、Python等)。這些特性使JSON成為理想的資料交換語言。易於人閱讀和編寫,同時也易於機器解析和生成(一般用於提升網路傳輸速率)。
json簡單說就是javascript中的物件和數組,所以這兩種結構就是物件和陣列兩種結構,透過這兩種結構可以表示各種複雜的結構。
1、物件:物件在js中表示為「{}」括起來的內容,資料結構為{key:value,key:value,...}的鍵值對的結構,在面向物件的語言中,key為物件的屬性,value為對應的屬性值,所以很容易理解,取值方法為物件.key 取得屬性值,這個屬性值的型別可以是數字、字串、陣列、物件幾種。
2、陣列:陣列在js中是中括號「[]」括起來的內容,資料結構為["java","javascript","vb",...],取值方式和所有語言中一樣,使用索引獲取,欄位值的類型可以是數字、字串、陣列、物件幾種。
經過物件、陣列2種結構就可以組合成複雜的資料結構了。
使用JSON前需要先的導入json.jar包
#傳輸單一物件:
#新建一個servlet
package com.itnba.maya.a; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.json.JSONObject; /** * Servlet implementation class C */ @WebServlet("/C") public class C extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public C() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); //模拟从数据库中查处 Dog a=new Dog(); a.setName("小黄"); a.setAge(5); a.setZl("哈士奇"); JSONObject obj=new JSONObject(); obj.put("name", a.getName()); obj.put("age", a.getAge()); obj.put("zl", a.getZl()); JSONObject bb=new JSONObject(); bb.put("obj", obj); response.getWriter().append(bb.toString()); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
#效果如下:
jsp頁面
##
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> <script type="text/javascript" src="js/jquery-1.11.1.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("#k").click(function(){ $.ajax({ url:"C", data:{}, type:"POST", dataType:"JSON", success:function(httpdata){ $("#x").append("<li>"+httpdata.obj.name+"</li>"); $("#x").append("<li>"+httpdata.obj.age+"</li>"); $("#x").append("<li>"+httpdata.obj.zl+"</li>") } }) }); }); </script> </head> <body> <span id="k">查看</span> <h1> <ul id="x"> </ul></h1> </body> </html>效果如下:
#傳輸集合或陣列:
servlet:package com.itnba.maya.a; import java.io.IOException; import java.util.ArrayList; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.json.JSONArray; import org.json.JSONObject; /** * Servlet implementation class D */ @WebServlet("/D") public class D extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public D() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); //模拟从数据库中查出 Dog a1=new Dog(); a1.setName("小黄"); a1.setAge(5); a1.setZl("哈士奇"); Dog a2=new Dog(); a2.setName("中黄"); a2.setAge(6); a2.setZl("泰迪"); Dog a3=new Dog(); a3.setName("大黄"); a3.setAge(7); a3.setZl("京巴"); ArrayList<Dog> list=new ArrayList<Dog>(); list.add(a1); list.add(a2); list.add(a3); JSONArray arr= new JSONArray(); //遍历集合 for(Dog d:list){ JSONObject obj=new JSONObject(); obj.put("name", d.getName()); obj.put("age", d.getAge()); obj.put("zl", d.getZl()); arr.put(obj); } response.getWriter().append(arr.toString()); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }效果如下:
jsp頁面:
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> <script type="text/javascript" src="js/jquery-1.11.1.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("#k").click(function(){ $.ajax({ url:"D", data:{}, type:"POST", dataType:"JSON", success:function(httpdata){ for(var i=0;i<httpdata.length;i++){ var n=httpdata[i].name var a=httpdata[i].age var z=httpdata[i].zl var tr="<tr>" tr+="<td>"+n+"</td>" tr+="<td>"+a+"</td>" tr+="<td>"+z+"</td>" tr+="</tr>" $("#x").append(tr) } } }) }); }); </script> </head> <body> <span id="k">查看</span> <h1> <table width="100%" id="x" border="1px"> </table> </h1> </body> </html>效果如下: 上面是我整理給大家的,希望今後會對大家有幫助。 相關文章:
使用Ajax或Easyui等框架時的Json-lib的處理方案(圖文教學)
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