java-file Transcoding method

http://blog.csdn.net/zhengqiqiqinqin/article/details/12621201

Law One: java.lang.string

    //Law One: XX code-->new String (byte[]b,charset xx)-->stirng.getbytes (Charset yy)-->yy encoding     Public Static voidMethod_1 ()throwsException {fileinputstream fis=NewFileInputStream ("F:\\test\\test.txt"); File F=NewFile ("F:\\test\\copy-test2.txt"); if(!f.exists ()) f.createnewfile (); FileOutputStream Fos=NewFileOutputStream (f); byte[] b=New byte[10]; intLen=0;  while((Len=fis.read (b))!=-1)        {                 //idea: GB2312 to UTF-8, must pass an intermediate encoding medium, here is a string//converts a byte array to a string (its encoding is GBK as the operating system)//The string is then converted to another encoded byte arrayString s=NewString (B,0,len, "GB2312"); b=s.getbytes ("UTF-8"); //Fos.write (B,0,len); Note: This is wrong because the length of the byte array after transcoding has changed, not the original length of the byte arrayFos.write (b); }         if(fos!=NULL) Fos.close (); if(fis!=NULL) Fis.close (); }

Law II: java.io.inputstreamreader/outputstreamwriter: Bridge Conversion

//Law II (recommended): "IO Stream" XX code-->inputstreamreader (file, "XX")--->outputstreamwriter (file, "yy")-->yy encoding     Public Static voidMethod_2 ()throwsException {fileinputstream fis=NewFileInputStream ("F:\\test\\test.txt"); File F=NewFile ("F:\\test\\copy-test.txt"); if(!f.exists ()) f.createnewfile (); FileOutputStream Fos=NewFileOutputStream (f); //IO Transfer ConnectionInputStreamReader isr=NewInputStreamReader (FIS, "GB2312"); OutputStreamWriter OSW=NewOutputStreamWriter (FOS, "UTF-8"); //read:         Char[] cs=New Char[1024]; intLen=0;  while((Len=isr.read (CS))!=-1) {Osw.write (CS,0, Len); }         //Close the streamOsw.flush ();        Osw.close ();    Isr.close (); }

Method Three: Java.nio.Charset

java-file Transcoding method