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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 ();Ten$ ("Input[value=save")). Remove (); Onevar html= ""; A for(Var i=0;i<returneddata.length;i++){ -html+= " '; - } the -$ ("#div1"). append (HTML); -$ ("Input[value=clickme]"). After ("<input type= ' button ' id= ' save1 ' value= ' save ' >"); -$ ("#save1"). Click (function () { +$ ("#div2"). HTML ("procession")); -$.post ("Saveimageservlet", + {}, A function () { at - }); - }); - //Alert ($ ("select:selected"). Val ()); - }); - }); in }); -</script> to + -<body> the<select id= "Select1" > *<option value= "1" >picture1</option> $<option value= "2" >picture2</option>Panax Notoginseng<option value= "3" >picture3</option> -<option value= "4" selected>picture4</option> the<option value= "5" >picture5</option> +<option value= "" >picture6</option> A<option value= "7" >picture7</option> the<option value= "8" >updatepicture</option> + - $</select> $<!--<input type= "text" id= "num" >- -<input type= "button" id= "Button1" value= "ClickMe" > -<div id= "Div2" ></div> the<div id= "Div1" ></div> -</body>WuyiAjax submits data to Gsonservlet
PackageCom.zhanghaobo.servlet;Importjava.io.IOException;ImportJava.io.PrintWriter;Importjava.util.ArrayList;Importjavax.servlet.ServletException;ImportJavax.servlet.http.HttpServlet;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse;Importjavax.servlet.http.HttpSession;ImportOrg.json.JSONArray;ImportOrg.json.JSONObject;ImportCom.google.gson.Gson;ImportCom.zhanghaobo.model.*; Public classGsonservletextendsHttpServlet {/*** Get picture information from the target website by ID value*/ Private Static Final LongSerialversionuid = 1L; Public voiddoget (httpservletrequest request, httpservletresponse response)throwsservletexception, IOException {} Public voidDoPost (httpservletrequest request, httpservletresponse response)throwsservletexception, IOException {//used to store the acquired picture informationArraylist<string> returnlist=NewArraylist<string>(); HttpSession Session=request.getsession (); //Store in SessionSession.setattribute ("Images", returnlist); String queryString=NULL; String questring=NULL; Try { intNum=integer.parseint (Request.getparameter ("id")); Session.setattribute ("Number", num); //System.out.println (Networkutil.getstringcontentfromurl (queryString)); if(num!=8) {queryString=NewStringBuffer (CONSTANT.URL1). Append (num). toString (); }Else{queryString=NewStringBuffer (constant.urlupdate). toString (); } //get JSON data from a Web siteJsonobject json11=NewJsonobject (Networkutil.getstringcontentfromurl (queryString)); //Get row Count intSum=json11.getint ("Total"); if(num!=8) {questring=NewStringBuffer (CONSTANT.URL1). Append (num). Append ("&rows="). Append (sum). toString (); }Else{questring=NewStringBuffer (constant.urlupdate). Append ("? rows="). Append (sum). toString (); } jsonobject json12=NewJsonobject (Networkutil.getstringcontentfromurl (questring)); Jsonarray IMGs=json12.getjsonarray ("Tngou"); SYSTEM.OUT.PRINTLN (num); for(intI=0;i) {jsonobject img=Imgs.getjsonobject (i); String result=img.getstring ("img"); //System.out.println (result);StringBuffer sb=NewStringBuffer (); Sb.append (Constant.url). append (result); Returnlist.add (Sb.tostring ()); } //data transfer with Gson informationGson gjson=NewGson (); 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 (); } }}Auxiliary classes
Public classNetworkutil { Public StaticString Getstringcontentfromurl (String queryString)throwsexception{String str=queryString; //Get ConnectionsURLConnection conn=NewURL (str). OpenConnection (); //Read input streamInputStream is=Conn.getinputstream (); //Stream conversion of Byte stream charactersInputStreamReader isr=NewInputStreamReader (IS); BufferedReader BR=NewBufferedReader (ISR); StringBuffer Buffer=NewStringBuffer (); String Line=NULL; while(NULL! = (line=Br.readline ())) {Buffer.append (line); } br.close (); Isr.close (); Is.close (); //System.out.println (buffer); returnbuffer.tostring (); } Get pictures from the exposed API and download save
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