Java字符编码工具类[UTF-8编码实现]
import java.io.UnsupportedEncodingException;
import java.URLEncoder;
import java.URLDecoder;
/**
*
Title:字符编码工具类
*
Description:
*
Copyright: flashman Copyright (c) 2005
*
Company: flashman
* @author: jeffzhu
* @version 1.0
*/
public class CharTools {
/**
* 转换编码 ISO-8859-1到GB2312
* @param text
* @return
*/
public String ISO2GB(String text) {
String result = "";
try {
result = new Bytes("ISO-8859-1"), "GB2312");
}
catch (UnsupportedEncodingException ex) {
result = ex.toString();
}
return result;
}
/**
* 转换编码 GB2312到ISO-8859-1
* @param text
* @return
*/
public String GB2ISO(String text) {
String result = "";
try {
result = new Bytes("GB2312"), "ISO-8859-1");
}
catch (UnsupportedEncodingException ex) {
ex.printStackTrace();
}
return result;
}
/**
* Utf8URL编码
* @param s
* @return
*/
public String Utf8URLencode(String text) {
StringBuffer result = new StringBuffer();
for (int i = 0; i < text.length(); i++) {
char c = text.charAt(i);
if (c >= 0 && c <= 255) {
result.append(c);
}else {
byte[] b = new byte[0];
try {
url编码和utf8区别b = String(c).getBytes("UTF-8");
}catch (Exception ex) {
}
for (int j = 0; j < b.length; j++) {
int k = b[j];
if (k < 0) k += 256;
result.append("%" + HexString(k).toUpperCase());
}
}
}
String();
}
/**
* Utf8URL解码
* @param text
* @return
*/
public String Utf8URLdecode(String text) {
String result = "";
int p = 0;
if (text!=null && text.length()>0){
text = LowerCase();
p = text.indexOf("%e");
if (p == -1) return text;
while (p != -1) {
result += text.substring(0, p);
text = text.substring(p, text.length());
if (text == "" || text.length() < 9) return result;
result += CodeToWord(text.substring(0, 9));
text = text.substring(9, text.length());
p = text.indexOf("%e");
}
}
return result + text;
}
/**
* utf8URL编码转字符
* @param text
* @return
*/
private String CodeToWord(String text) {
String result;
if (Utf8codeCheck(text)) {
byte[] code = new byte[3];
code[0] = (byte) (Integer.parseInt(text.substring(1, 3), 16) - 256);
code[1] = (byte) (Integer.parseInt(text.substring(4, 6), 16) - 256);
code[2] = (byte) (Integer.parseInt(text.substring(7, 9), 16) - 256);
try {
result = new String(code, "UTF-8");
}catch (UnsupportedEncodingException ex) {
result = null;
}
}
else {
result = text;
}
return result;
}
public static boolean isValidUtf8(byte[] b, int aMaxCount) {
int lLen = b.length, lCharCount = 0;
for (int i = 0; i < lLen && lCharCount < aMaxCount; ++lCharCount) {
byte lByte = b[i++]; //to fast operation, ++ now, ready for the following for(;;)

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