2 Steps to jsp send post request and print response data

zhilun yu | December 6th, 2013

Step 2: Add demo code in this jsp file

After you have created a jsp file, then you can copy code below into your jsp file.


<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<%@ page import="java.net.HttpURLConnection"%>
<%@ page import="java.net.URL"%>
<%@ page import="java.util.HashMap"%>
<%@ page import="java.util.List"%>
<%@ page import="java.io.BufferedReader"%>
<%@ page import="java.io.ByteArrayOutputStream"%>
<%@ page import="java.io.FileOutputStream"%>
<%@ page import="java.io.IOException"%>
<%@ page import="java.io.InputStream"%>
<%@ page import="java.io.OutputStream"%>
<%@ page import="java.io.PrintWriter"%>
<%@ page import="java.net.URLConnection"%>
<%@ page import="java.util.Map"%>

<%
// param
String coordinates= request.getParameter("coordinates");
String target=request.getParameter("target");
String source= request.getParameter("source");

coordinates = (coordinates == null ? "" : coordinates.trim());
target = (target == null ? "" : target.trim());
source = (source == null ? "" : source.trim());

String URL = "http://10.18.54.190:7080/ipark-site/seven/inverse.action";
%>
<%

class CoordHttpRequester {
 public String sendPost(String url, String param) {
 ByteArrayOutputStream out = null;
 InputStream in = null;
 String result = "";
 try {
 URL realUrl = new URL(url);

 HttpURLConnection conn = (HttpURLConnection)realUrl.openConnection();
 conn.setDoOutput(true);
 conn.setDoInput(true);
 conn.setRequestMethod("POST");

 conn.setConnectTimeout(30 * 1000);
 conn.setReadTimeout(30 * 1000);
 conn.getOutputStream().write(param.getBytes());
 conn.getOutputStream().flush();

 in = conn.getInputStream();
 out = new ByteArrayOutputStream();
 byte[] bufferByte = new byte[1024];
 for (int l = -1; (l = in.read(bufferByte)) > -1;) {
 out.write(bufferByte, 0, l);
 out.flush();
 }
 byte[] dataReturn = out.toByteArray();
 result=new String(dataReturn);
 } catch (Exception e) {
 e.printStackTrace();
 }
 finally {
 try {
 if (out != null) {
 out.close();
 }
 if (in != null) {
 in.close();
 }
 } catch (IOException ex) {
 ex.printStackTrace();
 }
 }
 return result;
 }
}
%>
<%
String s1 = "";
if(!"".equals(coordinates)&& !"".equals(target) && !"".equals(source)){
 // post
 s1= new CoordHttpRequester().sendPost("http://127.0.0.1/online-tools/test.php","coordinates=51,30&target=80&source=54");
}
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>demo</title>
</head>

<body>
<p><%=s1%></p>
</body>
</html>