前段时间做URL的中文转换，有些url是utf8的格式，有的是gb2312的格式，很难区分到底是utf8还是gb2312，找了好久，发现网上的一个牛人写的转换代码：
package org.apache.hadoop.examples;
import java.io.UnsupportedEncodingException;
//import java.net.URLEncoder;
import java.net.URLDecoder;
/**
* <p>Title:字符编码工具类 </p>
* <p>Description: </p>
* <p>Copyright: flashman.com.cn Copyright (c) 2005</p>
* <p>Company: flashman.com.cn </p>
* @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 String(text.getBytes("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 String(text.getBytes("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 {
b = Character.toString(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("%" + Integer.toHexString(k).toUpperCase());
}
}
}
return result.toString();
}
/**
* Utf8URL解码
* @param text
* @return
*/
public String Utf8URLdecode(String text) {
String result = "";
int p = 0;
if (text!=null && text.length()>0){
text = text.toLowerCase();
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;
}
/**
* 编码是否有效
* @param text
* @return
*/
private boolean Utf8codeCheck(String text){
String sign = "";
if (text.startsWith("%e"))
for (int i = 0, p = 0; p != -1; i++) {
p = text.indexOf("%", p);
if (p != -1)
p++;
sign += p;
}
return sign.equals("147-1");
}
/**
* 是否Utf8Url编码
* @param text
* @return
*/
public boolean isUtf8Url(String text) {
text = text.toLowerCase();
int p = text.indexOf("%");
if (p != -1 && text.length() - p > 9) {
text = text.substring(p, p + 9);
}
return Utf8codeCheck(text);
}
/**
* 测试
* @param args
*/
// public static void main(String[] args) throws Exception{
// CharTools charTools = new CharTools();
// String url;
// url = "http://www.google.com/search?hl=zh-CN&newwindow=1&q=%E4%B8%AD%E5%9B%BD%E5%A4%A7%E7%99%BE%E7%A7%91%E5%9C%A8%E7%BA%BF%E5%85%A8%E6%96%87%E6%A3%80%E7%B4%A2&btnG=%E6%90%9C%E7%B4%A2&lr=";
// if(charTools.isUtf8Url(url)){
// System.out.println(charTools.Utf8URLdecode(url));
// }else{
// System.out.println(URLDecoder.decode(url,"gb2312"));
// }
// url = "http://www.baidu.com/baidu?word=%D6%D0%B9%FA%B4%F3%B0%D9%BF%C6%D4%DA%CF%DF%C8%AB%CE%C4%BC%EC%CB%F7&tn=myie2dg";
// if(charTools.isUtf8Url(url)){
// System.out.println(charTools.Utf8URLdecode(url));
// }else{
// System.out.println(URLDecoder.decode(url,"gb2312"));
// }
// }
}
转：http://www.360doc.com/content/06/0829/16/6246_193641.shtml