文件md5验证生成器(java版)

1. importjava.applet.*;
2. importjava.io.*;
3. importjava.security.*;
5. publicclassHashFile{
6. publicstaticchar[]hexChar={'0','1','2','3',
7. '4','5','6','7',
8. '8','9','a','b',
9. 'c','d','e','f'};
10. publicstaticvoidmain(String[]args)throws
11. Exception{
12. StringfileName="D://programs//Foxmail.rar";
13. StringhashType="MD5";
14. System.out.println(hashType+"=="+
15. getHash(fileName,hashType));
16. hashType="SHA1";
17. System.out.println(hashType+"=="+
18. getHash(fileName,hashType));
19. hashType="SHA-256";
20. System.out.println(hashType+"=="+
21. getHash(fileName,hashType));
22. hashType="SHA-384";
23. System.out.println(hashType+"=="+
24. getHash(fileName,hashType));
25. hashType="SHA-512";
26. System.out.println(hashType+"=="+
27. getHash(fileName,hashType));
29. }
31. publicstaticStringgetHash(StringfileName,StringhashType)throws
32. Exception{
33. InputStreamfis;
34. fis=newFileInputStream(fileName);
35. byte[]buffer=newbyte[1024];
36. MessageDigestmd5=MessageDigest.getInstance(hashType);
37. intnumRead=0;
38. while((numRead=fis.read(buffer))>0){
39. md5.update(buffer,0,numRead);
40. }
41. fis.close();
42. returntoHexString(md5.digest());
43. }
45. publicstaticStringtoHexString(byte[]b){
46. StringBuildersb=newStringBuilder(b.length*2);
47. for(inti=0;i<b.length;i++){
48. sb.append(hexChar[(b[i]&0xf0)>>>4]);
49. sb.append(hexChar[b[i]&0x0f]);
50. }
51. returnsb.toString();
52. }
53. }