Java Image Load readImage(InputStream inp)

Description

read Image

License

Apache License

Declaration

public static ImageIcon readImage(InputStream inp) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import javax.swing.*;
import java.io.*;

public class Main {
    public static ImageIcon readImage(InputStream inp) {
        byte[] bytes = readInBytes(inp);
        return new ImageIcon(bytes);
    }//  w  ww. j  a v a2  s . c  om

    public static byte[] readInBytes(InputStream inp, int lenthGuess) {
        InputStream TheStream = new BufferedInputStream(inp);
        return readInFile(TheStream, 4096, lenthGuess);
    }

    public static byte[] readInBytes(InputStream inp) {
        return readInBytes(inp, 4096);
    }

    /**
     * { method
     *
     * @param TheStream the file stream
     * @param len       the file length or a good guess
     * @return StringBuilder holding file bytes
     *         }
     * @name readInFile
     * @function reads all the data in a file into a StringBuilder
     */
    public static byte[] readInFile(InputStream TheStream, int len, int chunk) {
        ByteArrayOutputStream os = new ByteArrayOutputStream(len);
        int NRead = 0;
        byte[] buffer = new byte[chunk];
        try {
            NRead = TheStream.read(buffer, 0, chunk);
            while (NRead != -1) {
                os.write(buffer, 0, NRead);
                NRead = TheStream.read(buffer, 0, chunk);
                // ought to look at non-printing chars
            }
            TheStream.close();
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }
        return (os.toByteArray());
    }

    /**
     * { method
     *
     * @param TheStream the file stream
     * @param len       the file length or a good guess
     * @param maxlen    maxlength to read
     * @return file bytes
     *         }
     * @name readInFile
     * @function reads all the data in a file into a StringBuilder
     */
    public static byte[] readInFile(InputStream TheStream, int len, int chunk, int maxlen) {
        ByteArrayOutputStream os = new ByteArrayOutputStream(len);
        int NRead = 0;
        byte[] buffer = new byte[chunk];
        chunk = Math.min(chunk, maxlen - os.size());
        try {
            NRead = TheStream.read(buffer, 0, chunk);
            while (NRead != -1 && os.size() < maxlen) {
                os.write(buffer, 0, NRead);
                chunk = Math.min(chunk, maxlen - os.size());
                NRead = TheStream.read(buffer, 0, chunk);
                // ought to look at non-printing chars
            }
            TheStream.close();
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }
        return (os.toByteArray());
    }
}

Related

1. loadImage(InputStream s)
2. loadImage(Object parent, String pathToImage)
3. loadImage(String filename)
4. loadImage(String filePath, int imageSize)
5. loadImage(URL url)
6. readImageToLabel(String netUrl)