Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.io.IOException;
import java.io.InputStream;

public class Main {
    public static String getTypeByStream(InputStream is) {
        byte[] b = new byte[4];
        try {
            is.read(b, 0, b.length);
        } catch (IOException e) {
            e.printStackTrace();
        }
        String type = bytesToHexString(b).toUpperCase();
        if (type.contains("FFD8FF")) {
            return "jpg";
        } else if (type.contains("89504E47")) {
            return "png";
        } else if (type.contains("47494638")) {
            return "gif";
        } else if (type.contains("49492A00")) {
            return "tif";
        } else if (type.contains("424D")) {
            return "bmp";
        }
        return type;
    }

    public static String getTypeByStream(byte[] data) {
        byte[] b = new byte[4];
        b[0] = data[0];
        b[1] = data[1];
        b[2] = data[2];
        b[3] = data[3];
        String type = bytesToHexString(b).toUpperCase();
        if (type.contains("FFD8FF")) {
            return "jpg";
        } else if (type.contains("89504E47")) {
            return "png";
        } else if (type.contains("47494638")) {
            return "gif";
        } else if (type.contains("49492A00")) {
            return "tif";
        } else if (type.contains("424D")) {
            return "bmp";
        }
        return type;
    }

    public static String bytesToHexString(byte[] src) {
        StringBuilder stringBuilder = new StringBuilder();
        if (src == null || src.length <= 0) {
            return null;
        }
        for (int i = 0; i < src.length; i++) {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }
}