package com.gjob.common; public class URLtoUTF8 {     //转换为%E4%BD%A0形式     public static String toUtf8String(String s) {         StringBuffer sb = new StringBuffer();         for (int i = 0; i < s.length(); i++) {             char c = s.charAt(i);             if (c >= 0 && c <= 255) {                 sb.append(c);             } else {                 byte[] b;                 try {                     b = String.valueOf(c).getBytes("utf-8");                 } catch (Exception ex) {                     System.out.println(ex);                     b = new byte[0];                 }                 for (int j = 0; j < b.length; j++) {                     int k = b[j];                     if (k < 0)                         k += 256;                     sb.append("%" + Integer.toHexString(k).toUpperCase());                 }             }         }         return sb.toString();     }     //将%E4%BD%A0转换为汉字     public static String unescape(String s) {         StringBuffer sbuf = new StringBuffer();         int l = s.length();         int ch = -1;         int b, sumb = 0;         for (int i = 0, more = -1; i < l; i++) {             /* Get next byte b from URL segment s */             switch (ch = s.charAt(i)) {             case '%':                 ch = s.charAt(++i);                 int hb = (Character.isDigit((char) ch) ? ch - '0'                         : 10 + Character.toLowerCase((char) ch) - 'a') & 0xF;                 ch = s.charAt(++i);                 int lb = (Character.isDigit((char) ch) ? ch - '0'                         : 10 + Character.toLowerCase((char) ch) - 'a') & 0xF;                 b = (hb << 4) | lb;                 break;             case '+':                 b = ' ';                 break;             default:                 b = ch;             }             /* Decode byte b as UTF-8, sumb collects incomplete chars */             if ((b & 0xc0) == 0x80) { // 10xxxxxx (continuation byte)                   sumb = (sumb << 6) | (b & 0x3f); // Add 6 bits to sumb                   if (--more == 0)                     sbuf.append((char) sumb); // Add char to sbuf               } else if ((b & 0x80) == 0x00) { // 0xxxxxxx (yields 7 bits)                   sbuf.append((char) b); // Store in sbuf               } else if ((b & 0xe0) == 0xc0) { // 110xxxxx (yields 5 bits)                   sumb = b & 0x1f;                 more = 1; // Expect 1 more byte               } else if ((b & 0xf0) == 0xe0) { // 1110xxxx (yields 4 bits)                   sumb = b & 0x0f;                 more = 2; // Expect 2 more bytes               } else if ((b & 0xf8) == 0xf0) { // 11110xxx (yields 3 bits)                   sumb = b & 0x07;                 more = 3; // Expect 3 more bytes               } else if ((b & 0xfc) == 0xf8) { // 111110xx (yields 2 bits)                   sumb = b & 0x03;                 more = 4; // Expect 4 more bytes               } else /*if ((b & 0xfe) == 0xfc)*/{ // 1111110x (yields 1 bit)                   sumb = b & 0x01;                 more = 5; // Expect 5 more bytes               }             /* We don't test if the UTF-8 encoding is well-formed */         }         return sbuf.toString();     }     public static void main(String[] args){         System.out.println(URLtoUTF8.toUtf8String("你"));         System.out.println(URLtoUTF8.unescape("%E4%BD%A0%20%E5%A5%BD"));     } }