编码java实现的utf8，gbk，unicode编码相互转换的代码

Java实现的utf8 gbk unic ode编码相互转换的代码public static String GBK2Unicode(String str) {

StringBuffer result=new StringBuffer();for(int i=0; i s tr.length(); i++) {c har c hr 1=(c har) str.c harAt(i);if(!isNeedConvert(chr 1)) {result.append(chr 1);c ontinue;result.append( \\u+Integer.toHexString((int)c hr 1));return result.toString();

*@param dataStr

*@return Stringpublic static String Unicode2GBK(String dataStr) {int index=0;

StringBuffer buffer=new StringBuffer();int li_len=dataStr.length();while(index li_len) {if(index=li_len- 1

| | ! \\u.equals(dataStr.subs tring(index, index+2))) {buffer.append(dataStr.charAt(index));index++;c ontinue;

String charStr=

charStr=dataStr.substring(index+2, index+6);char letter=(char) Integer.pars eInt(charStr, 16);buffer.app end(letter);index+=6;return buffer.toString();public static boolean isNeedConvert(char para) {r eturn((p ar a(0 x 00 F F)) !=p ar a);

*utf-8转unic ode

*@param inStr

*@return Stringpublic static String utf8ToUnicode(String inStr) {c har[]myBuffer=inStr.toCharArray();

StringBuffer sb=new StringBuffer();for(int i=0; i inStr.length(); i++) {

UnicodeBlock ub=UnicodeBlock.of(myBuffer[i]);if(ub==UnicodeBlock.BASIC_LATIN) {sb.append(myBuffer[i]);

} else if(ub==UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {int j=(int)myBuffer[i] -65248;sb.append((char)j);

} els e {short s=(short)myBuffer[i];

String hexS=Integer.toHexString(s);

String unicode=\\u+hexS;sb.append(unic ode.toLow erCas e());return sb.toString();

*@param theString

*@return Stringpublic static String unicodeToUtf8(String theString) {char aChar;int len=theString.length();

String Buffer outBuffer=new StringBuffer(len);for(int x=0;x len;) {aChar=theS tring.c harAt(x++);if(aChar==‘\\’) {aChar=theS tring.c harAt(x++);if(aChar==‘u’) {

//Read the xxxxint value=0;for(int i=0; i i++) {aChar=theS tring.c harAt(x++);sw itc h(aChar) {case ‘0’ :case ‘1’ :

case ‘2’ :case ‘3’ :case ‘4’ :case ‘5’ :case ‘6’ :case ‘7’ :case ‘8’ :case ‘9’ :value=(value 4)+aChar- ‘0’ ;break;case ‘a’ :case ‘b’ :case ‘c’ :case ‘d’ :case ‘e’ :case ‘f’ :value=(value 4)+10+aChar- ‘a’ ;break;case ‘A’ :case ‘B’ :case ‘C’ :case ‘D’ :

case ‘E’ :case ‘F’ :value=(value 4)+10+aChar- ‘A’ ;break;default:throw new IllegalArgumentExc eption(Malformed\\uxxxx enc oding.outBuffer.append((c har)value);

} els e {if(aChar==‘t’)aChar=‘\t’ ;els e if(aChar==‘r’)aChar=‘\r’ ;els e if(aChar==‘n’)aChar=‘\n’ ;els e if(aChar==‘f’)aChar=‘\f’ ;outBuffer.app end(aChar);

} els eoutBuffer.app end(aChar);return outBuffer.to String();

}