Java图片与byte数组相互转化

以你之姓@ 2022-01-23 01:23 406阅读 0赞

## Java图片与byte数组相互转化 ##

图片与byte数组相互转化的工具类：

import java.io.ByteArrayOutputStream;
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    
    import javax.imageio.stream.FileImageInputStream;
    import javax.imageio.stream.FileImageOutputStream;
    
    public class Test {
    
    	/**
    	 * 图片转化为byte数组
    	 * @param path
    	 * @return
    	 */
    	public byte[] image2byte(String path){
    		byte[] data = null;
    		FileImageInputStream input = null;
    		try {
    			input = new FileImageInputStream(new File(path));
    			ByteArrayOutputStream output = new ByteArrayOutputStream();
    			byte[] buf = new byte[1024];
    			int numBytesRead = 0;
    			while ((numBytesRead = input.read(buf)) != -1) {
    				output.write(buf, 0, numBytesRead);
    			}
    			data = output.toByteArray();
    			output.close();
    			input.close();
    		} catch (FileNotFoundException ex1) {
    			ex1.printStackTrace();
    		} catch (IOException ex1) {
    			ex1.printStackTrace();
    		}
    		return data;
    	}
        
    	/**
    	 * byte数组转化为图片
    	 * @param data
    	 * @param path
    	 */
    	public void byte2image(byte[] data,String path){
    		if(data.length<3||path.equals("")) {
    			return;
    		}
    		try{
    			FileImageOutputStream imageOutput = new FileImageOutputStream(new File(path));
    			imageOutput.write(data, 0, data.length);
    			imageOutput.close();
    			System.out.println("Make Picture success,Please find image in " + path);
    		} catch(Exception ex) {
    			System.out.println("Exception: " + ex);
    			ex.printStackTrace();
    		}
    	}
    	
    	/**
    	 * byte数组到16进制字符串
    	 * @param data
    	 * @return
    	 */
    	public String byte2string(byte[] data){
    		if(data==null||data.length<=1) {
    			return "0x";
    		}
    		if(data.length>200000) {
    			return "0x";
    		}
    		StringBuffer sb = new StringBuffer();
    		int buf[] = new int[data.length];
    		//byte数组转化成十进制
    		for(int k=0;k<data.length;k++){
    			buf[k] = data[k]<0?(data[k]+256):(data[k]);
    		}
    		//十进制转化成十六进制
    		for(int k=0;k<buf.length;k++){
    			if(buf[k]<16) {
    				sb.append("0"+Integer.toHexString(buf[k]));
    			} else {
    				sb.append(Integer.toHexString(buf[k]));
    			}
    		}
    		return "0x"+sb.toString().toUpperCase();
    	} 
    }