Document verification and Google Gson use

Source: Internet
Author: User
Tags crc32 crc32 checksum

One, the CRC32 file is more test

A file check can ensure that the contents of the file are not tampered with, just in the work, recorded.

1 Private voiddochecksum (String fileName) {2     Try {3             4LOG.D ("checksum", fileName);5             6Checkedinputstream CIS =NULL;7             LongFileSize = 0;8             Try {9                 //Computer CRC32 ChecksumTenCIS =NewCheckedinputstream ( One                         NewFileInputStream (FileName),NewCRC32 ()); A   -FileSize =NewFile (fileName). Length (); -                  the}Catch(FileNotFoundException e) { -System.err.println ("File not found.")); -System.exit (1); -             } +   -             byte[] buf =New byte[256]; +              while( (BUF) >= 0) { A                  at             } -   -             //----------------------------------------------- -                         -             LongChecksum =cis.getchecksum (). GetValue (); -Showtext = checksum + "+ fileSize +" +FileName; in              - System.out.println (showtext); toLOG.D ("checksum", showtext); +Mhanler.sendemptymessage (1); -              the              *}Catch(IOException e) { $ e.printstacktrace ();Panax NotoginsengSystem.exit (1); -         } the}

Second, Google Gson

Gson is quite handy for working with JSON data, and the example

1  Public classWechatconfig {2     Private intId;3     4      Public intgetId () {5         returnId;6     }7      Public voidSetId (intId) {8          This. Id =Id;9     }Ten  One      A      -}

1 WeChat  new  WeChat (); 2 Wc.setid (+); 3 4 String json = mgson.tojson (WC); 5 6 {"Id": 20}



Document verification and Google Gson use

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