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1 <script type="text/javascript" src="scripts/jquery-2.2.1.js"></script> 2 <script type="text/javascript"> 3 $(function(){ 4 $("#button1").click(function(){ 5 $.post("GsonServlet", 6 {"id":$("select :selected").val()}, 7 function(returnedData,status){ 8 //alert(returnedData.length); 9 $("#div1").empty(); 10 $("input[value=save]").remove(); 11 var html=""; 12 for(var i=0;i<returnedData.length;i++){ 13 html+="<img src=‘"+returnedData[i]+"‘width=‘300‘ height=‘300‘>"; 14 } 15 16 $("#div1").append(html); 17 $("input[value=clickme]").after("<input type=‘button‘ id=‘save1‘ value=‘save‘>"); 18 $("#save1").click(function(){ 19 $("#div2").html("procession"); 20 $.post("SaveImageServlet", 21 {}, 22 function(){ 23 24 }); 25 }); 26 //alert($("select :selected").val()); 27 }); 28 }); 29 }); 30 </script> 31 </head> 32 33 <body> 34 <select id="select1"> 35 <option value="1">picture1</option> 36 <option value="2">picture2</option> 37 <option value="3">picture3</option> 38 <option value="4" selected>picture4</option> 39 <option value="5">picture5</option> 40 <option value="">picture6</option> 41 <option value="7">picture7</option> 42 <option value="8">updatepicture</option> 43 44 45 </select> 46 <!-- <input type="text" id="num"> --> 47 <input type="button" id="button1" value="clickme"> 48 <div id="div2"></div> 49 <div id="div1"></div> 50 </body> 51 </html>
ajax提交数据到GsonServlet
package com.zhanghaobo.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.json.JSONArray; import org.json.JSONObject; import com.google.gson.Gson; import com.zhanghaobo.model.*; public class GsonServlet extends HttpServlet { /** * 通过id值向目标网站获取图片信息 */ private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //用来存放获取的图片信息 ArrayList<String> returnlist=new ArrayList<String>(); HttpSession session=request.getSession(); //在session中存放 session.setAttribute("images",returnlist); String queryString=null; String queString=null; try { int num=Integer.parseInt(request.getParameter("id")); session.setAttribute("number", num); //System.out.println(NetWorkUtil.getStringContentFromURL(queryString)); if(num!=8){ queryString=new StringBuffer(Constant.url1).append(num).toString(); }else{ queryString=new StringBuffer(Constant.urlupdate).toString(); } //从网站获取JSON数据 JSONObject json11=new JSONObject(NetWorkUtil.getStringContentFromURL(queryString)); //获取行数 int sum=json11.getInt("total"); if(num!=8){ queString=new StringBuffer(Constant.url1).append(num).append("&rows=").append(sum).toString(); }else{ queString=new StringBuffer(Constant.urlupdate).append("?rows=").append(sum).toString(); } JSONObject json12=new JSONObject(NetWorkUtil.getStringContentFromURL(queString)); JSONArray imgs=json12.getJSONArray("tngou"); System.out.println(num); for(int i=0;i<imgs.length();i++){ JSONObject img=imgs.getJSONObject(i); String result=img.getString("img"); //System.out.println(result); StringBuffer sb=new StringBuffer(); sb.append(Constant.url).append(result); returnlist.add(sb.toString()); } //把信息用Gson进行数据传递 Gson gjson=new Gson(); String jsonres=gjson.toJson(returnlist); System.out.println(jsonres); response.setContentType("application/json;charset=utf-8"); response.setHeader("pragma","no-cache"); response.setHeader("cache-control","no-cache"); PrintWriter out=response.getWriter(); out.println(jsonres); out.flush(); out.close(); } catch (Exception e) { e.printStackTrace(); } } }
辅助类
public class NetWorkUtil { public static String getStringContentFromURL(String queryString) throws Exception{ String str=queryString; //获取连接 URLConnection conn=new URL(str).openConnection(); //读取输入流 InputStream is=conn.getInputStream(); //字节流字符流转换 InputStreamReader isr=new InputStreamReader(is); BufferedReader br=new BufferedReader(isr); StringBuffer buffer=new StringBuffer(); String line=null; while(null!=(line=br.readLine())){ buffer.append(line); } br.close(); isr.close(); is.close(); //System.out.println(buffer); return buffer.toString(); }
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原文地址：http://www.cnblogs.com/oldcownotGiveup/p/5404158.html
