做頁面開發時使用了Javascript的escape()函式進行URL編碼，如果url中有中文，結果在JSP或Servlet中用request.getParameter()時取不到引數，只返回一個空值。經過Baidu的搜尋，結合我自己的工作實際，再加上網友的一些幫助，終於找到了問題所在及解決的辦法。

        本來Javascript中的escape()是將中文按ISO-8859-1字符集進行URL編碼的，那樣通過 request.getParameter()是能直接獲取到請求引數的，但後來的Javascript將escape()換成了Unicode字符集編 碼，如此一來，在JSP和Servlet中就沒法直接拿到請求引數了，而且此時的request獲得的引數值都是空值，想了好久，也測試了不少，但是還是百思不得其解。 最後藉助於網路，終於解決了此問題，我露出了燦爛的笑容☺

        解決辦法：

        1、首先對中文字元進行兩次escape()編碼，如要傳引數name，值為“黃修群”，則url的格式為....name=escape(escape("黃修群"))，這樣一來，在request.getParameter()就能取到編碼後的引數了，但是引數去編碼的形式：如下：

%u9EC4%u4FEE%u7FA4，

獲得的頁面引數為:獲取request引數值-->%u9EC4%u4FEE%u7FA4

此時在使用java.net.URIDecoder.decode()方法，則出現解碼錯誤，錯誤資訊如下：

2010-5-19 15:28:03 org.apache.catalina.core.ApplicationDispatcher invoke
嚴重: Servlet.service() for servlet jsp threw exception
java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: "u9"
 at java.net.URLDecoder.decode(URLDecoder.java:173)
 at com.mapgis.vfd.plugins.vfdwebserver.VFDWebServer.getPageParameterList(VFDWebServer.java:674)

可見是解碼出現了問題了

也許有人問，那我在客戶端非要只用一次escape方法編碼，會出現什麼樣的結果？請看下面：

2010-5-19 14:59:38 org.apache.tomcat.util.http.Parameters processParameters
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)

。。。。。

看到上面的提示資訊，可以斷定是解碼出現問題了，而獲得的請求物件去是空的，如下：

獲取request引數值-->null

        2、由於取到的引數是  u9EC4%u4FEE%u7FA4格式的，沒法用常規的URLDecoder.decode()來進行解碼，還好，這世上的牛人夠多，在網上直接找到了一個工具類，能實現 Javascript中escape()及unescape()式的編解碼，原始碼如下：
/** * JavaScript escape/unescape 編碼的 Java 實現 * author jackyz * keep this copyright info while using this method by free */ 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 = "黃修群1234 abcd[]()<+>,.~//"; System.out.println(stest); System.out.println(escape(stest)); System.out.println(unescape(escape(stest))); } }

程式碼執行如下：

黃修群1234 abcd[]()<+>,.~/
%u9EC4%u4FEE%u7FA41234+abcd%5B%5D()%3C%2B%3E%2C.~%5C
黃修群1234 abcd[]()<+>,.~/
黃修群

有了這個工具類，直接用Escape.unescape()方法就能將獲取到的引數解碼成中文格式了。

paraValue= Escape.unescape(request.getParameter(name).toString().trim());

結果輸出了：黃修群

幸福吧，哈哈！