File Upload and Download using Servlets and JSP

shyam — Fri, 24 Apr 2009 13:18:04 +0000

fileupload.jsp

<%–
    Document   : fileupload.jsp
    Created on : Apr 24, 2009, 3:40:43 PM
    Author     : shyam
–%>

<%@page contentType=”text/html” pageEncoding=”UTF-8″%>



        File upload



File upload!



            File name(syntax: Filename.ext)

filedownload.jsp

<%–
    Document   : filedownload.jsp
    Created on : Apr 24, 2009, 4:26:07 PM
    Author     : shyam
–%>
<%@ page import=”edu.FileUpload,edu.UploadedFormFile” %>
<%
    try {
        FileUpload fileUpload = new FileUpload();
        UploadedFormFile uploadedFormFile = fileUpload.fileUpload(request);
        byte[] bArray = uploadedFormFile.getFileData();

        response.setContentType(“application/x-download”);
        response.setHeader(“Content-Disposition”, “attachment;filename=” + uploadedFormFile.getContentTitle());
        ServletOutputStream sos = response.getOutputStream();
        sos.write(bArray, 0, uploadedFormFile.getFileSize());
        sos.flush();
        sos.close();

    } catch (Throwable t) {
        t.printStackTrace();
    }
%>

FileUpload.java

package edu;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.ArrayList;

/**
*
* @author shyam

*/
public class FileUpload {

    public UploadedFormFile fileUpload(HttpServletRequest request)
            throws Throwable {

        boolean nowUCanBreak = false;
        int totalSize = 0;
        System.out.println("The fileUpload() begning.");
        if (request != null) {
            System.out.println("The request not null.");
        } else {
            System.out.println("The request null begning.");
        }
        UploadedFormFile uploadedFormFile = null;
        ArrayList list = new ArrayList();
        ServletInputStream sis = request.getInputStream();

        totalSize = sis.available();

        StringWriter sw = new StringWriter();

        int i = sis.read();

        for (; i != -1 && i != '\r'; i = sis.read()) {
            sw.write(i);
        }
        sis.read(); // ditch '\n'
        String delimiter = sw.toString();
        try {
            while (true) {
                StringWriter h = new StringWriter();
                int[] temp = new int[4];
                temp[0] = (byte) sis.read();
                temp[1] = (byte) sis.read();
                temp[2] = (byte) sis.read();
                h.write(temp[0]);
                h.write(temp[1]);
                h.write(temp[2]);

                // read header
                for (temp[3] = sis.read(); temp[3] != -1; temp[3] = sis.read()) {
                    if (temp[0] == '\r' &&
                            temp[1] == '\n' &&
                            temp[2] == '\r' &&
                            temp[3] == '\n') {
                        break;
                    }
                    h.write(temp[3]);
                    temp[0] = temp[1];
                    temp[1] = temp[2];
                    temp[2] = temp[3];
                }
                String header = h.toString();

                int startName = header.indexOf("name=\"");
                int endName = header.indexOf("\"", startName + 6);
                if (startName == -1 || endName == -1) {
                    break;
                }

                String name = header.substring(startName + 6, endName);

                if (name != null && name.equals("file")) {
                    nowUCanBreak = true;

                    startName = header.indexOf("filename=\"");
                    endName = header.indexOf("\"", startName + 10);
                    String filePath =  header.substring(startName + 10, endName);
                    String filename = filePath.substring(filePath.lastIndexOf("\\") + 1);
                    uploadedFormFile.setFileName(filename);

                    // write whole file to disk
                    int length = 0;
                    delimiter = "\r\n" + delimiter;
                    byte[] body = new byte[delimiter.length()];
                    for (int j = 0; j < body.length; j++) {
                        body[j] = (byte) sis.read();
                        System.out.print(((char) body[j]));
                    }
                    // check it wasn't a 0 length file
                    if (!delimiter.equals(new String(body))) {
                        try {
                            int e = body.length - 1;
                            i = sis.read();
                            for (; i != -1; i = sis.read()) {
                                list.add(new Byte(body[0]));
                                for (int l = 0; l < body.length - 1; l++) {
                                    body[l] = body[l + 1];
                                }
                                body[e] = (byte) i;
                                if (delimiter.equals(new String(body))) {
                                    break;
                                }
                                length++;
                            }
                        } catch (Throwable e) {
                            e.printStackTrace();
                        }
                    } else {
                        System.out.println("The file is of zero bytes length");
                    }
                    try {
                        byte bFileData[] = null;
                        int listSize = list.size();
                        if (listSize > 0) {
                            bFileData = new byte[listSize];
                        }

                        for (int z = 0; z < listSize; z++) {
                            bFileData[z] = ((Byte) list.get(z)).byteValue();
                        }
                        uploadedFormFile.setFileSize((int) (listSize));
                        uploadedFormFile.setFileData(bFileData);
                    } catch (Throwable e) {
                        e.printStackTrace();
                    }
                } else if (name != null && name.equals("contentTitle")) {
                    StringWriter bbbString = new StringWriter();
                    while (true) {
                        int a = 0;
                        a = sis.read();
                        bbbString.write(a);
                        if (a == '\r') {
                            break;
                        }
                    }
                    String bbbStringStr = bbbString.toString();
                    bbbStringStr = bbbStringStr.substring(0, bbbStringStr.lastIndexOf("\r"));
                    uploadedFormFile = new UploadedFormFile();
                    uploadedFormFile.setContentTitle(bbbStringStr);
                } else {
                    System.out.println("The form name two is " + name);
                }
                if (sis.read() == '-' && sis.read() == '-' && nowUCanBreak) {
                    break;
                }
            }
        } catch (Throwable e) {
            e.printStackTrace();
            throw e;
        } finally {
            sis.close();
        }
        return uploadedFormFile;
    }
}

UploadedFormFile.java

package edu;

import java.io.InputStream;
/**
*
* @author shyam
*/
public class UploadedFormFile{
    String fileName=null;
    String contentType=null;
    byte[] fileData=null;
    int fileSize=0;
    private String contentTitle=null;
    public void destroy(){}
    public String getContentType(){return contentType;}
    public byte[] getFileData(){return fileData;}
    public String getFileName(){return fileName;}
    public int getFileSize(){return fileSize;}
    public InputStream getInputStream(){return null;}
    public void setContentType(String contentType){this.contentType=contentType;}
    public void setFileName(String fileName){this.fileName=fileName;}
    public void setFileSize(int fileSize){this.fileSize=fileSize;}
    public void setFileData(byte[] fileData){this.fileData=fileData;}
    public String getContentTitle() {return contentTitle;}
    public void setContentTitle(String contentTitle) {this.contentTitle = contentTitle;} 
}

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-Shyam.

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Comparing any two files with any extension in java

shyam — Fri, 17 Apr 2009 14:42:20 +0000

import java.io.File;
import java.io.FileInputStream;

import java.io.BufferedInputStream;

/**
*
* @author shyam

*/
public class Test {

/**
* @param args the command line arguments
*/
public static void main(String[] args) throws Exception{
String filePath1="c:/file1.txt";
String filePath2="c:/file2.txt";

Test test=new Test();

//Using FileInputStream
if(test.compareFiles(filePath1,filePath2)){
System.out.println("Both the files are same.");
}
else{
System.out.println("Files are not same.");
}

//Using BufferedInputStream on FileInputStream

if(test.compareFilesWithBuffer(filePath1,filePath2)){
System.out.println("Both the files are same.");
}
else{
System.out.println("Files are not same.");
}

 
}

 

//    A BufferedInputStream adds functionality to another input stream-namely,
//     the ability to buffer the input and to support the mark and reset methods.
//     When the BufferedInputStream is created, an internal buffer array is created.
//     As bytes from the stream are read or skipped, the internal buffer is refilled
//     as necessary from the contained input stream, many bytes at a time.
//     The mark operation remembers a point in the input stream and the reset
//     operation causes all the bytes read since the most recent mark operation
//     to be reread before new bytes are taken from the contained input stream.

boolean compareFilesWithBuffer(String filePath1,String filePath2){
        try{           
            File f1 = new File(filePath1);
            File f2 = new File(filePath2);
            if(f1.length() == f2.length()){
                BufferedInputStream bis1=new BufferedInputStream(new FileInputStream(f1));
                BufferedInputStream bis2=new BufferedInputStream(new FileInputStream(f2)); 

                while(true){
                    int a = bis1.read();
                    int b = bis2.read();
                    if(a != b){
                        return false;
                    }
                    if(a == -1){
                        return true;
                    }
                }
            }else{
                return false;
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return false;
    }

 

boolean compareFiles(String filePath1,String filePath2){
try{
File f1 = new File(filePath1);
File f2 = new File(filePath2);
if(f1.length() == f2.length()){
FileInputStream fis1 = new FileInputStream(f1);
FileInputStream fis2 = new FileInputStream(f2);

while(true){
int a = fis1.read();
int b = fis2.read();
if(a != b){
return false;
}
if(a == -1){
return true;
}
}
}else{
return false;
}

}catch(Exception e){
e.printStackTrace();
}
return false;
}
 
}

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Techelp » java.io Package

File Upload and Download using Servlets and JSP

fileupload.jsp

File upload!

filedownload.jsp

FileUpload.java

UploadedFormFile.java

Comparing any two files with any extension in java