URLDecoder失败

最新推荐文章于 2025-03-07 22:50:50 发布

chengyixun7345

最新推荐文章于 2025-03-07 22:50:50 发布

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文章标签： java javascript ViewUI

原文链接：https://my.oschina.net/xqysun/blog/919610

版权

System.out.println(URLDecoder.decode("%u82CF%u5DDE", "UTF-8"));

%u82CF%u5DDE 是从前台传递过来的参数，以上语句在执行的时候，控制台报错

Exception in thread "main" java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: "u8"
	at java.net.URLDecoder.decode(URLDecoder.java:192)
	at demo.Test.main(Test.java:115)

在网上直接找到了一个工具类，能实现 Javascript中escape()及unescape()式的编解码，源代码如下：

package demo;

import org.apache.commons.lang3.StringEscapeUtils;

public class Escape
{
	 private final static String[] hex = {
		        "00","01","02","03","04","05","06","07","08","09","0A","0B","0C","0D","0E","0F",
		        "10","11","12","13","14","15","16","17","18","19","1A","1B","1C","1D","1E","1F",
		        "20","21","22","23","24","25","26","27","28","29","2A","2B","2C","2D","2E","2F",
		        "30","31","32","33","34","35","36","37","38","39","3A","3B","3C","3D","3E","3F",
		        "40","41","42","43","44","45","46","47","48","49","4A","4B","4C","4D","4E","4F",
		        "50","51","52","53","54","55","56","57","58","59","5A","5B","5C","5D","5E","5F",
		        "60","61","62","63","64","65","66","67","68","69","6A","6B","6C","6D","6E","6F",
		        "70","71","72","73","74","75","76","77","78","79","7A","7B","7C","7D","7E","7F",
		        "80","81","82","83","84","85","86","87","88","89","8A","8B","8C","8D","8E","8F",
		        "90","91","92","93","94","95","96","97","98","99","9A","9B","9C","9D","9E","9F",
		        "A0","A1","A2","A3","A4","A5","A6","A7","A8","A9","AA","AB","AC","AD","AE","AF",
		        "B0","B1","B2","B3","B4","B5","B6","B7","B8","B9","BA","BB","BC","BD","BE","BF",
		        "C0","C1","C2","C3","C4","C5","C6","C7","C8","C9","CA","CB","CC","CD","CE","CF",
		        "D0","D1","D2","D3","D4","D5","D6","D7","D8","D9","DA","DB","DC","DD","DE","DF",
		        "E0","E1","E2","E3","E4","E5","E6","E7","E8","E9","EA","EB","EC","ED","EE","EF",
		        "F0","F1","F2","F3","F4","F5","F6","F7","F8","F9","FA","FB","FC","FD","FE","FF"
		    };
		    private final static byte[] val = {
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
		        0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F
		    };
		    public static String escape(String s) {
		        StringBuffer sbuf = new StringBuffer();
		        int len = s.length();
		        for (int i = 0; i < len; i++) {
		            int ch = s.charAt(i);
		            if (ch == ' ') {                        // space : map to '+' 
		                sbuf.append('+');
		            } else if ('A' <= ch && ch <= 'Z') {    // 'A'..'Z' : as it was
		                sbuf.append((char)ch);
		            } else if ('a' <= ch && ch <= 'z') {    // 'a'..'z' : as it was
		                sbuf.append((char)ch);
		            } else if ('0' <= ch && ch <= '9') {    // '0'..'9' : as it was
		                sbuf.append((char)ch);
		            } else if (ch == '-' || ch == '_'       // unreserved : as it was
		                || ch == '.' || ch == '!'
		                || ch == '~' || ch == '*'
		                || ch == '/' || ch == '('
		                || ch == ')') {
		                sbuf.append((char)ch);
		            } else if (ch <= 0x007F) {              // other ASCII : map to %XX
		                sbuf.append('%');
		                sbuf.append(hex[ch]);
		            } else {                                // unicode : map to %uXXXX
		                sbuf.append('%');
		                sbuf.append('u');
		                sbuf.append(hex[(ch >>> 8)]);
		                sbuf.append(hex[(0x00FF & ch)]);
		            }
}
		        return sbuf.toString();
		    }
		    public static String unescape(String s) {
		        StringBuffer sbuf = new StringBuffer();
		        int i = 0;
		        int len = s.length();
		        while (i < len) {
		            int ch = s.charAt(i);
		            if (ch == '+') {                        // + : map to ' ' 
		                sbuf.append(' ');
		            } else if ('A' <= ch && ch <= 'Z') {    // 'A'..'Z' : as it was
		                sbuf.append((char)ch);
		            } else if ('a' <= ch && ch <= 'z') {    // 'a'..'z' : as it was
		                sbuf.append((char)ch);
		            } else if ('0' <= ch && ch <= '9') {    // '0'..'9' : as it was
		                sbuf.append((char)ch);
		            } else if (ch == '-' || ch == '_'       // unreserved : as it was
		                || ch == '.' || ch == '!'
		                || ch == '~' || ch == '*'
		                || ch == '/' || ch == '('
		                || ch == ')') {
		                sbuf.append((char)ch);
		            } else if (ch == '%') {
		                int cint = 0;
		                if ('u' != s.charAt(i+1)) {         // %XX : map to ascii(XX)
		                    cint = (cint << 4) | val[s.charAt(i+1)];
		                    cint = (cint << 4) | val[s.charAt(i+2)];
		                    i+=2;
		                } else {                            // %uXXXX : map to unicode(XXXX)
		                    cint = (cint << 4) | val[s.charAt(i+2)];
		                    cint = (cint << 4) | val[s.charAt(i+3)];
		                    cint = (cint << 4) | val[s.charAt(i+4)];
		                    cint = (cint << 4) | val[s.charAt(i+5)];
		                    i+=5;
		                }
		                sbuf.append((char)cint);
		            }
		            i++;
		        }
		        return sbuf.toString();
		    }
		    public static void main(String[] args) {
		        String stest = "苏州";
		        System.out.println(stest);
		        System.out.println(escape(stest));
		        System.out.println(unescape("%u82CF%u5DDE"));
		    }
}

转载于:https://my.oschina.net/xqysun/blog/919610