Java - 读图片为字节数组，写字节数组为图片

工具类：

import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class ImageIOUtils {
    
    

    public static byte[] read(String name) throws IOException {
    
    
        File file = new File(name);
        
        if (!file.exists() || !file.isFile())
            return null;
        
        FileInputStream fis = new FileInputStream(name);
        
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        
        byte[] buffer = new byte[1024 * 1];
        for (int length = fis.read(buffer); length > 0; length = fis.read(buffer))
            baos.write(buffer, 0, length);
        baos.flush();
        
        byte[] bytes = baos.toByteArray();
        
        close(baos);
        close(fis);
        
        return bytes;
    }
    
    public static void write(byte[] data, String name) throws IOException {
    
    
        FileOutputStream fos = new FileOutputStream(name);
        fos.write(data);
        fos.flush();
        close(fos);
    }
    
    public static void close(Closeable closeable) {
    
    
        if (closeable == null)
            return;
        
        try {
    
    
            closeable.close();
        } catch (IOException e) {
    
    
            
        }
    }
}

测试类：

import java.io.IOException;

import com.mk.util.ImageIOUtils;

public class ImageIOUtilsTests {
    
    

    public static void main(String[] args) throws IOException {
    
    
        byte[] data = ImageIOUtils.read("E:/PrtSc/1/starry-sky.jpg"); // Read from
        
        ImageIOUtils.write(data, "E:/PrtSc/1/starry-sky-copy.jpg"); // Write to
    }
}