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URLDecoder对参数进行解码时候，代码如：
URLDecoder.decode(param,"utf-8");
有时候会出现类似如下的错误：
URLDecoder异常Illegal hex characters in escape (%)
这是因为传参有一些特殊字符，比如%号或者说+号，导致不能解析，报错
解决方法是：
1 public static String replacer(StringBuffer outBuffer) {
2 String data = outBuffer.toString();
3 try {
4 data = data.replaceAll("%(?![0-9a-fA-F]{2})", "%25");
5 data = data.replaceAll("\\+", "%2B");
6 data = URLDecoder.decode(data, "utf-8");
7 } catch (Exception e) {
8 e.printStackTrace();
9 }
10 return data;
11 }
URLDecoder源码：
1 public static String decode(String s, String enc)
2 throws UnsupportedEncodingException{
3
4 boolean needToChange = false;
5 int numChars = s.length();
6 StringBuffer sb = new StringBuffer(numChars > 500 ? numChars / 2 : numChars);
7 int i = 0;
8
9 if (enc.length() == 0) {
10 throw new UnsupportedEncodingException ("URLDecoder: empty string enc parameter");
11 }
12
13 char c;
14 byte[] bytes = null;
15 while (i < numChars) {
16 c = s.charAt(i);
17 switch (c) {
18 case '+':
19 sb.append(' ');
20 i++;
21 needToChange = true;
22 break;
23 case '%':
24 /*
25 * Starting with this instance of %, process all
26 * consecutive substrings of the form %xy. Each
27 * substring %xy will yield a byte. Convert all
28 * consecutive bytes obtained this way to whatever
29 * character(s) they represent in the provided
30 * encoding.
31 */
32
33 try {
34
35 // (numChars-i)/3 is an upper bound for the number
36 // of remaining bytes
37 if (bytes == null)
38 bytes = new byte[(numChars-i)/3];
39 int pos = 0;
40
41 while ( ((i+2) < numChars) &&
42 (c=='%')) {
43 int v = Integer.parseInt(s.substring(i+1,i+3),16);
44 if (v < 0)
45 throw new IllegalArgumentException("URLDecoder: Illegal hex characters in escape (%) pattern - negative value");
46 bytes[pos++] = (byte) v;
47 i+= 3;
48 if (i < numChars)
49 c = s.charAt(i);
50 }
51
52 // A trailing, incomplete byte encoding such as
53 // "%x" will cause an exception to be thrown
54
55 if ((i < numChars) && (c=='%'))
56 throw new IllegalArgumentException(
57 "URLDecoder: Incomplete trailing escape (%) pattern");
58
59 sb.append(new String(bytes, 0, pos, enc));
60 } catch (NumberFormatException e) {
61 throw new IllegalArgumentException(
62 "URLDecoder: Illegal hex characters in escape (%) pattern - "
63 + e.getMessage());
64 }
65 needToChange = true;
66 break;
67 default:
68 sb.append(c);
69 i++;
70 break;
71 }
72 }
73
74 return (needToChange? sb.toString() : s);
75 }
