How to load URL Connection to Client machine using Java servlet

This example explains how to load web result to client browser.Web result mean output of some third party application(Ex:image, bill, any URL..etc).

Implementation steps;First Create URL object and create HttpURLConnection by using above object.openConnection();Then create BufferedInputStream by passing InputStream to constructer of BufferedInputStream.Finally writes this buffered input stream data to output stream of the servlet.

package com.srccodes.example;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;



public class OldBillClient extends HttpServlet {
    private static final long serialVersionUID = 1L;


    public OldBillClient() {
        super();
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
        //System.out.println("Done");
    }

    HttpURLConnection conn;

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
       
        doDL();//Create URL connection for download and show
       
        BufferedInputStream in = new BufferedInputStream(conn.getInputStream());//Used created connection
        OutputStream sos = response.getOutputStream();
        try {
            int i = 0;
            while ((i = in.read()) != -1) {
                sos.write(i);//Writes data to out put stream
                //System.out.write(i);
            }
            in.close();
            sos.flush();
        } finally {
            if (in != null)
                in.close();
            if (sos != null) {
                sos.flush();
                sos.close();
            }
        }
    }
   
    /**
     * set URL connection
     */
    private void doDL() {
        try {
            URL obj = new URL("https://www.google.lk/#q=Test");//Ex : http://170.26.29.180/com/test/?para_1=value_1&para_2=value_2
            conn = (HttpURLConnection) obj.openConnection();
            conn.setReadTimeout(5000);
        } catch (java.io.IOException ioE) {
            ioE.getMessage();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

Java - Generate PDF file using local machine's .txt file

Following sample explain how to create pdf file using iText.jar(used iText 5.0.4 for following sample)

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Date;

import com.itextpdf.text.Document;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;

public class GeneratePDF {

    public static void main(String[] args) {
        try {
            OutputStream file = new FileOutputStream(new File("D:\\Test.pdf"));

            Document document = new Document();
            PdfWriter.getInstance(document, file);

            document.open();
            document.setMargins(50, 50, 50, 50);
            document.add(new Paragraph("Page 1"));
            document.add(new Paragraph(new Date().toString()));

            document.newPage();// new Page
            document.add(new Paragraph("Page 2"));

            document.newPage();// new Page
            document.add(new Paragraph("Page 3 : Added external text file"));

            // read file from location and add to same PDF
            File fileIn = new File("D:\\sampleTextFileInYourMachine.txt");
            FileInputStream fi = new FileInputStream(fileIn);

            String text = getFileContent(fi);
            document.add(new Paragraph(text));
            document.close();
            file.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getFileContent(FileInputStream fis) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(fis));
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = br.readLine()) != null) {
                sb.append(line);
                sb.append('\n');
            }
            return sb.toString();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return null;
    }

}