JSON小示例
JSON(JAVASCRIPT OBJECT Notation,JAVASCRIPT的对象表示法).
1.ajaxjson.html代码
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head> <title>Ajax-JSON</title> <script type="text/javascript" src="jslib/jquery-1.3.1.js"></script> <script type="text/javascript" src="jslib/json.js"></script></head><body> <input type='button' value='Show JSON' onclick='getJSON();'/> <div id="show" style="disply:none;"></div></body></html>
function getJSON(){ var url ="AjaxJSONServlet?dumb"+new Date(); $.get(url, null, function (data){ var obj = eval(data); var resultObj = $("#show"); var message =''; for(var id in obj){ var s = obj[id]; message+=('ID:'+s.id+' NAME:'+s.name+' COUNTRY:'+s.country+' AGE:'+s.age); message +="<br/>"; } resultObj.html(message); });}package com.ajax.test.part1;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.ServletException;import java.io.IOException;import java.io.PrintWriter;import java.net.URLDecoder;/** * Created by IntelliJ IDEA. * User: Administrator * Date: 2011-6-26 * Time: 11:01:30 * To change this template use File | Settings | File Templates. */public class AjaxJSONServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException { this.doPost(httpServletRequest, httpServletResponse); } @Override protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException { httpServletResponse.setContentType("text/html;charset=utf-8"); PrintWriter out = httpServletResponse.getWriter();/**返回一个数组(其中包含2个对象)***/ StringBuffer buff = new StringBuffer(); buff.append("[{"); buff.append(" id:").append("'").append("01234").append("',"); buff.append("name:").append("'").append("lyle").append("',"); buff.append("age:").append("20").append(","); buff.append("country:").append("'").append("USA").append("'"); buff.append("},{"); buff.append(" id:").append("'").append("0000002").append("',"); buff.append("name:").append("'").append("lyle du").append("',"); buff.append("age:").append("29").append(","); buff.append("country:").append("'").append("CN").append("'"); buff.append("}]"); //System.print(); out.print(buff); }}JSONObject jsonObject = new JSONObject();jsonObject.put("a", 1); jsonObject.put("b", 1.1);jsonObject.put("c", 1L);jsonObject.put("d", "test");jsonObject.put("e", true);System.out.println(jsonObject);//{"d":"test","e":true,"b":1.1,"c":1,"a":1} public static String toJSONObj(Map<Object, Object>... jsonList) { StringBuffer buff = new StringBuffer(); for (Map<Object, Object> jsonMap : jsonList) { Set<Entry<Object, Object>> set = jsonMap.entrySet(); List<String> l = new ArrayList<String>(); for (Iterator<Entry<Object, Object>> iter = set.iterator(); iter.hasNext();) { Entry<Object, Object> entry = iter.next(); if (entry.getValue() instanceof Integer) { l.add(String.valueOf(entry.getKey()) + ":" + entry.getValue()); } else { l.add(String.valueOf(entry.getKey()) + ":'" + String.valueOf(entry.getValue()) + "'"); } } buff.append(",").append("{").append(StringUtils.join(l.iterator(), ",")).append("}"); } if (StringUtils.isNotBlank(buff.toString())) { return "[" + buff.substring(",".length(), buff.toString().length()) + "]"; } return ""; }