作为java程序员，中文的乱码问题会经常碰到。过去的一个项目，我碰到了各种类型的java乱码问题。先分享给大家：
 
1：网页Post请求，提交后，显示提交结果，乱码。
首先确定数据库的编码方式。这里我发现，如果数据库的编码不是UTF-8，Post请求也可以保证回显正确，但是有一个地方要注意。
如html中：
（1）
这时，value中的num中文会正常显示。
 
（2）"/>
这时，value中的Num中文不会显示，显示乱码。
这是因为jstl标签库的原因。
虽然（1）代码可以显示中文，但仍然推荐数据库编码改成UTF-8
 
2：网页get请求，提交后，显示乱码。
这个问题就比较复杂了。
解决方法可以分为两步，（我们首先做了第一部，解决了大部分问题，第二步是解决特殊问题）。
我们难免使用get请求提交，如果其中有中文，那么：
 
（1）Tomcat中：
找到 server.xml 中的
        enableLookups="false" redirectPort="8443" acceptCount="100"
    connectionTimeout="20000" disableUploadTimeout="true" URIEncoding='GBK' />
以上方法是在网上找到的，我尝试了，起不到效果，但给了我们启发，我们如下做：
URIEncoding="UTF-8"
没想到成功了。我想这应该和我的操作系统的语言有关。我们是英文系统。
 
（2）这个是我为了解决一小部分（ajax和js动态生成的html）中提交中文问题，因为以上的方法都解决不了这个问题。我找到了如下类：
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 };




/**

* @param s

* @return

*/

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 ('A' <= ch && ch <= 'Z') {

                             sbuf.append(( char) ch);

                } else if ('a' <= ch && ch <= 'z') {

                             sbuf.append(( char) ch);

                } else if ('0' <= ch && ch <= '9') {

                             sbuf.append(( char) ch);

                } else if (ch == '-' || ch == '_' || ch == '.' || ch == '!'

                                            || ch == '~' || ch == '*' || ch == '\'' || ch == '('

                                            || ch == ')') {

                             sbuf.append(( char) ch);

                } else if (ch <= 0x007F) {

                             sbuf.append('%');

                             sbuf.append(hex[ch]);

                } else {

                             sbuf.append('%');

                             sbuf.append('u');

                             sbuf.append(hex[(ch >>> 8)]);

                             sbuf.append(hex[(0x00FF & ch)]);

                }

}

return sbuf.toString();

}



/** */

/**

* @param s

* @return

*/

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 ('A' <= ch && ch <= 'Z') {

                             sbuf.append(( char) ch);

                } else if ('a' <= ch && ch <= 'z') {

                             sbuf.append(( char) ch);

                } else if ('0' <= ch && ch <= '9') {

                             sbuf.append(( char) ch);

                } else if (ch == '-' || ch == '_' || ch == '.' || ch == '!'

                                            || ch == '~' || ch == '*' || ch == '\'' || ch == '('

                                            || ch == ')') {

                             sbuf.append(( char) ch);

                } else if (ch == '%') {

                             int cint = 0;

                             if ('u' != s.charAt(i + 1)) {

                                            cint = (cint << 4) | val[s.charAt(i + 1)];

                                            cint = (cint << 4) | val[s.charAt(i + 2)];

                                            i += 2;

                             } else {

                                            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);

                } else {

                             sbuf.append(( char) ch);

                }

                i++;

}

return sbuf.toString();

}

}

这个类在CSDN上可是要收5个资源点的。我给大家分享了。嘿嘿，多多来捧场啊。
只有类是不够的，我们的get请求需要用js赖提交，在提交前有如下操作：
...+"&PERSON="+escape(escape(persons))+...
这时提交的URL中的一部分：persons就是可能含有中文的部分。
在代码中： Escape.unescape(request.getParameter("PERSON")  来接受这个get请求。这样，基本所有的页面请求中文问题，就解决了。