文件 转为16进制 ，16进制转为文件

  1 import java.io.*;
  2 
  3 /**
  4  * @author ipodao@qq.com
  5  * @date 2019/9/4 16:05
  6  */
  7 public class ExportFile {
  8     private static final String EXPORT_PATH = "C:\\Users\\ipodao\\OneDrive\\文档\\rowan\\1\\";
  9 
 10     public static void main(String[] args) {
 11         ExportFile apk = new ExportFile();
 12         String infilePath = EXPORT_PATH + "test.zip";
 13         String outfilePath = EXPORT_PATH + "hex.txt";
 14         apk.fileToHex(infilePath, outfilePath);
 15         //hex val
 16         String val = "";
 17         apk.hexToFile(val, "a.zip");
 18     }
 19 
 20     /**
 21      * 文件转成十六进制
 22      *
 23      * @param infilePath  转为16进制的文件
 24      * @param outfilePath 16进制 txt
 25      */
 26     public void fileToHex(String infilePath, String outfilePath) {
 27         try {
 28             StringBuffer sb = new StringBuffer();
 29             FileInputStream fis = new FileInputStream(infilePath);
 30             java.io.ByteArrayOutputStream bos = new java.io.ByteArrayOutputStream();
 31 
 32             byte[] buffer = new byte[1024];
 33             int read = 1024;
 34             int readSize = 1024;
 35             while (read == readSize) {
 36                 read = fis.read(buffer, 0, readSize);
 37                 bos.write(buffer, 0, read);
 38             }
 39             byte[] result = bos.toByteArray();
 40             // 字节数组转成十六进制
 41             String str = byte2HexStr(result);
 42             System.out.println("HexStr：" + str);
 43             /*
 44              * 将十六进制串保存到txt文件中
 45              */
 46             PrintWriter pw = new PrintWriter(new FileWriter(outfilePath));
 47             pw.println(str);
 48             pw.close();
 49         } catch (IOException e) {
 50             e.printStackTrace();
 51         }
 52     }
 53 
 54     /**
 55      * 十六进制转成文件
 56      *
 57      * @param hex
 58      * @param filePath
 59      */
 60     public static void hexToFile(String hex, String filePath) {
 61         StringBuilder sb = new StringBuilder();
 62         sb.append(hex);
 63         saveToFile(sb.toString().toUpperCase(), EXPORT_PATH + filePath);
 64     }
 65 
 66     /**
 67      * hex 转为文件
 68      *
 69      * @param src
 70      * @param output
 71      */
 72     public static void saveToFile(String src, String output) {
 73         if (src == null || src.length() == 0) {
 74             return;
 75         }
 76         try {
 77             FileOutputStream out = new FileOutputStream(new File(output));
 78             byte[] bytes = src.getBytes();
 79             for (int i = 0; i < bytes.length; i += 2) {
 80                 out.write(charToInt(bytes[i]) * 16 + charToInt(bytes[i + 1]));
 81             }
 82             out.close();
 83         } catch (Exception e) {
 84             e.printStackTrace();
 85         }
 86     }
 87 
 88     private static int charToInt(byte ch) {
 89         int val = 0;
 90         if (ch >= 0x30 && ch <= 0x39) {
 91             val = ch - 0x30;
 92         } else if (ch >= 0x41 && ch <= 0x46) {
 93             val = ch - 0x41 + 10;
 94         }
 95         return val;
 96     }
 97 
 98     /*
 99      * 实现字节数组向十六进制的转换方法一
100      */
101     public static String byte2HexStr(byte[] b) {
102         String hs = "";
103         String stmp = "";
104         for (int n = 0; n < b.length; n++) {
105             stmp = (Integer.toHexString(b[n] & 0XFF));
106             if (stmp.length() == 1) {
107                 hs = hs + "0" + stmp;
108             } else {
109                 hs = hs + stmp;
110             }
111         }
112         return hs.toUpperCase();
113     }
114 }