java url编码与解码 （钓鱼岛是中国的！）

源代码：http://yuncode.net/code/c_5060109b8555a82

主要是对js的url编码进行解码

 

运行效果：

 

01/**

02 * java实现javascript中的escape和unescape函数

03 * 多用于URL编码与解码

04 */

05public class EscapeUnescape {

06    publicstatic String escape(String src) {

07        inti;

08        charj;

09        StringBuffer tmp =new StringBuffer();

10        tmp.ensureCapacity(src.length() *6);

11        for(i = 0; i < src.length(); i++) {

12            j = src.charAt(i);

13            if(Character.isDigit(j) || Character.isLowerCase(j)

14                    || Character.isUpperCase(j))

15                tmp.append(j);

16            elseif (j < 256) {

17                tmp.append("%");

18                if(j < 16)

19                    tmp.append("0");

20                tmp.append(Integer.toString(j,16));

21            }else {

22                tmp.append("%u");

23                tmp.append(Integer.toString(j,16));

24            }

25        }

26        returntmp.toString();

27    }

28  

29    publicstatic String unescape(String src) {

30        StringBuffer tmp =new StringBuffer();

31        tmp.ensureCapacity(src.length());

32        intlastPos = 0, pos =0;

33        charch;

34        while(lastPos < src.length()) {

35            pos = src.indexOf("%", lastPos);

36            if(pos == lastPos) {

37                if(src.charAt(pos + 1) =='u') {

38                    ch = (char) Integer.parseInt(

39                            src.substring(pos +2, pos + 6),16);

40                    tmp.append(ch);

41                    lastPos = pos +6;

42                }else {

43                    ch = (char) Integer.parseInt(

44                            src.substring(pos +1, pos + 3),16);

45                    tmp.append(ch);

46                    lastPos = pos +3;

47                }

48            }else {

49                if(pos == -1) {

50                    tmp.append(src.substring(lastPos));

51                    lastPos = src.length();

52                }else {

53                    tmp.append(src.substring(lastPos, pos));

54                    lastPos = pos;

55                }

56            }

57        }

58        returntmp.toString();

59    }

60  

61    publicstatic void main(String[] args) {

62        String tmp ="钓鱼岛是中国的！";

63  

64        System.out.println("编码：   "+ escape(tmp));

65        System.out.println("解码：   "+ unescape(tmp));

66    }

67}