警告: Parameters: Character decoding failed. Parameter skipped.和java.lang.IllegalA

今天在对接美团订单的时候，美团通过URL的get方式推送订单数据信息，在接收订单商品列表时，传的json数组形式的值，而且里面还有中文的商品名，通过request.getParameterMap()和request.getParameter(arg0)方式接收值得时候始终为空，并且报错：

警告: Parameters: Character decoding failed. Parameter skipped.
java.io.CharConversionException: isHexDigit
 at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:88)
 at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:49)
 at org.apache.tomcat.util.http.Parameters.urlDecode(Parameters.java:412)
 at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:394)

 后来实在没办法，通过String param = request.getQueryString();进行接收值是可以的，但是需要自己进行分割，在取得detail字段时（detail就是订单商品列表字段）形式如下：

detail=[{%22app_food_code%22:%226906907501623%22,%22box_num%22:0,%22box_price%22:0,%22food_discount%22:1,%22food_name%22:%22%E7%99%BE%E4%BA%8B%E5%8F%AF%E4%B9%902L%22,%22price%22:7,%22quantity%22:1,%22sku_id%22:%226906907501623%22,%22unit%22:%22%E4%BB%BD%22},{%22app_food_code%22:%226954767413877%22,%22box_num%22:0,%22box_price%22:0,%22food_discount%22:1,%22food_name%22:%22%E5%8F%AF%E5%8F%A3%E5%8F%AF%E4%B9%902L%22,%22price%22:6.8,%22quantity%22:1,%22sku_id%22:%226954767413877%22,%22unit%22:%22%E4%BB%BD%22},{%22app_food_code%22:%226932571040748%22,%22box_num%22:0,%22box_price%22:0,%22food_discount%22:1,%22food_name%22:%22%E5%91%B3%E5%85%A8%E6%AF%8F%E6%97%A5C100%%E6%A1%83%E6%B1%81300ml%22,%22price%22:6.5,%22quantity%22:1,%22sku_id%22:%226932571040748%22,%22unit%22:%22%E4%BB%BD%22}]%20

 然后我通过URLDecoder.decode(h_detail)进行转码的时候就又出了下面这个错：

java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: "u9"
 at java.Net.URLDecoder.decode(URLDecoder.java:173)

 

然后就是在网上一阵狂搜，最后终于找到了一种转码方式：

参考：http://blog.csdn.net/hbzyaxiu520/article/details/5607873

 

主要代码如下：

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();  
	    }

 

然后直接调用：h_detail = Util.unescape(h_detail);就完成了转码，剩下的就是字符串中文乱码转码的操作了：

h_detail = new String(h_detail.getBytes("ISO-8859-1"),"UTF-8");

最后就完成了接收美团订单数据的功能。