MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class MainClass {

    public static void main(String args[]) throws Exception {

        URL u = new URL("http://www.java2s.com/binary.dat");
        URLConnection uc = u.openConnection();
        String contentType = uc.getContentType();
        int contentLength = uc.getContentLength();
        if (contentType.startsWith("text/") || contentLength == -1) {
            throw new IOException("This is not a binary file.");
        }
        InputStream raw = uc.getInputStream();
        InputStream in = new BufferedInputStream(raw);
        byte[] data = new byte[contentLength];
        int bytesRead = 0;
        int offset = 0;
        while (offset < contentLength) {
            bytesRead = in.read(data, offset, data.length - offset);
            if (bytesRead == -1)
                break;
            offset += bytesRead;
        }
        in.close();

        if (offset != contentLength) {
            throw new IOException("Only read " + offset + " bytes; Expected " + contentLength + " bytes");
        }

        String filename = u.getFile().substring(filename.lastIndexOf('/') + 1);
        FileOutputStream out = new FileOutputStream(filename);
        out.write(data);
        out.flush();
        out.close();
    }
}