Java读取十六进制数转化为图片

墨蓝 2022-08-19 09:00 260阅读 0赞

最近遇到一个问题，服务器接收到图片转换之后的十六进制数据，怎么还原照片？

不多说，直接上代码：

package com.mybatis.test;
    
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    
    public class TestImage1 {
    	
    	public static void main(String[] args) throws Exception {
    	/*	byte[] b1 =image2Bytes("d:\\1.jpg");
    //		for(int i=0;i<b1.length;i++) b1[i]=Integer.toHexString(b1[i] & 0xFF)
    		System.out.println();
    		FileOutputStream fos=new FileOutputStream("d:\\image.txt");
    		fos.write(b1);
    		fos.close();*/
    		
    		FileInputStream fis=new FileInputStream(new File("d:\\data.txt"));
    		char[] ch=new char[fis.available()];
    		System.out.println(fis.available());
    		int len=fis.available();
    		int j=0;
    		System.out.println();
    		for(int i=0;i<len;i++){
    			int temp=fis.read();
    			char c=(char)temp;
    			if(temp!=32){
    				ch[j++]=c;
    //				System.out.print(c);
    			}
    		}
    		System.out.println();
    		
    		System.out.println(new String(ch,0,j).length());
    		byte[] b=hexStringToBytes(new String(ch,0,j));
    		buff2Image(b,"d:\\test.jpeg");
    		fis.close();
    		
    	}
    	
    	 
    	static void buff2Image(byte[] b,String tagSrc) throws Exception
        {
            FileOutputStream fout = new FileOutputStream(tagSrc);
            //将字节写入文件
            fout.write(b);
            fout.close();
        }
    	public static byte[] hexStringToBytes(String hexString) {  
    	    if (hexString == null || hexString.equals("")) {  
    	        return null;  
    	    }  
    	    hexString = hexString.toUpperCase();  
    	    int length = hexString.length() / 2;  
    	    char[] hexChars = hexString.toCharArray();  
    	    byte[] d = new byte[length];  
    	    for (int i = 0; i < length; i++) {  
    	        int pos = i * 2;  
    	        d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));  
    	    }  
    	    return d;  
    	}  
    	 private static byte charToByte(char c) {  
    		    return (byte) "0123456789ABCDEF".indexOf(c);  
    		}
    	
    	static byte[] image2Bytes(String imgSrc) throws Exception
        {
            FileInputStream fin = new FileInputStream(new File(imgSrc));
            //可能溢出,简单起见就不考虑太多,如果太大就要另外想办法，比如一次传入固定长度byte[]
            byte[] bytes  = new byte[fin.available()];
            //将文件内容写入字节数组，提供测试的case
            fin.read(bytes);
            fin.close();
            return bytes;
        }
    	public static String hexString2binaryString(String hexString)  
        {  
            if (hexString == null || hexString.length() % 2 != 0)  
                return null;  
            String bString = "", tmp;  
            for (int i = 0; i < hexString.length(); i++)  
            {  
                tmp = "0000"  
                        + Integer.toBinaryString(Integer.parseInt(hexString  
                                .substring(i, i + 1), 16));  
                bString += tmp.substring(tmp.length() - 4);  
            }  
            return bString;  
    }
    	
    	public static String binaryString2hexString(String bString)  
        {  
            if (bString == null || bString.equals("") || bString.length() % 8 != 0)  
                return null;  
            StringBuffer tmp = new StringBuffer();  
            int iTmp = 0;  
            for (int i = 0; i < bString.length(); i += 4)  
            {  
                iTmp = 0;  
                for (int j = 0; j < 4; j++)  
                {  
                    iTmp += Integer.parseInt(bString.substring(i + j, i + j + 1)) << (4 - j - 1);  
                }  
                tmp.append(Integer.toHexString(iTmp));  
            }  
            return tmp.toString();  
        }  
    }

项目下载地址：[http://download.csdn.net/detail/u010627840/9397491][http_download.csdn.net_detail_u010627840_9397491]

[http_download.csdn.net_detail_u010627840_9397491]: http://download.csdn.net/detail/u010627840/9397491