Java实现JS中的escape和UNescape代码分享

时间:2022-09-22 20:49:24

众所周知,JavaScript中escape() 函数可对字符串进行编码,这样就可以在所有的计算机上读取该字符串。下面,我们就来看看 Java语言中类似JavaScript中的escape() 和unescape() 转码方法,具体代码如下:

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
public class EscapeUnescape {
    public static String escape(String src) {
        int i;
        char j;
        StringBuffer tmp = new StringBuffer();
        tmp.ensureCapacity(src.length() * 6);
        for (i = 0; i < src.length(); i++) {
            j = src.charAt(i);
            if (Character.isDigit(j) || Character.isLowerCase(j)
                    || Character.isUpperCase(j))
                tmp.append(j);
            else if (j < 256) {
                tmp.append("%");
                if (j < 16)
                    tmp.append("0");
                tmp.append(Integer.toString(j, 16));
            } else {
                tmp.append("%u");
                tmp.append(Integer.toString(j, 16));
            }
        }
        return tmp.toString();
    }
    public static String unescape(String src) {
        StringBuffer tmp = new StringBuffer();
        tmp.ensureCapacity(src.length());
        int lastPos = 0, pos = 0;
        char ch;
        while (lastPos < src.length()) {
            pos = src.indexOf("%", lastPos);
            if (pos == lastPos) {
                if (src.charAt(pos + 1) == 'u') {
                    ch = (char) Integer.parseInt(src
                            .substring(pos + 2, pos + 6), 16);
                    tmp.append(ch);
                    lastPos = pos + 6;
                } else {
                    ch = (char) Integer.parseInt(src
                            .substring(pos + 1, pos + 3), 16);
                    tmp.append(ch);
                    lastPos = pos + 3;
                }
            } else {
                if (pos == -1) {
                    tmp.append(src.substring(lastPos));
                    lastPos = src.length();
                } else {
                    tmp.append(src.substring(lastPos, pos));
                    lastPos = pos;
                }
            }
        }
        return tmp.toString();
    }
    /**
     * @disc 对字符串重新编码
     * @param src
     * @return 
     */
    public static String isoToGB(String src) {
        String strRet = null;
        try {
            strRet = new String(src.getBytes("ISO_8859_1"), "GB2312");
        } catch (Exception e) {
 
        }
        return strRet;
    }
 
    /**
     * @disc 对字符串重新编码
     * @param src
     * @return 
     */
    public static String isoToUTF(String src) {
        String strRet = null;
        try {
            strRet = new String(src.getBytes("ISO_8859_1"), "UTF-8");
        } catch (Exception e) {
 
        }
        return strRet;
    }
    public static void main(String[] args) {
        String tmp = "中文";
        System.out.println("testing escape : " + tmp);
        tmp = escape(tmp);
        System.out.println(tmp);
        System.out.println("testing unescape :" + tmp);
        System.out.println(unescape("%u6211%u4eec"));
        System.out.println(isoToUTF(tmp));
    }
}

输出结果为:

?
1
2
3
4
5
testing escape : 中文
%u4e2d%u6587
testing unescape :%u4e2d%u6587
我们
%u4e2d%u6587

总结

以上就是本文对于Java实现JS中的escape和UNescape代码分享的全部内容,希望对大家有所帮助。

感谢大家对本站的支持!

原文链接:http://blog.csdn.net/hujingn/article/details/5791130