AJAX，js的escape函数传中文值到Servlet为NULL。

来源：互联网发布：mac steam存储目录编辑：程序博客网时间：2024/06/03 15:37

Js代码,如果传入的keyword为中文的话,就会出错。

var content = document.getElementById("keyword");var url = "province?keyword=" +  escape(content.value) ;

Servlet代码

String keyword = req.getParameter("keyword");   System.out.println("----------"+keyword);

输出

----------null

解决方法：

改js代码如下:

var url = "province?keyword=" +  escape( escape(content.value) );

修改servlet内容如下:

String keyword = req.getParameter("keyword");       String unkeyword =  《MyEscape》.unescape(keyword);System.out.println("----------"+unkeyword);

在前台输入 “山”，后台输出：

----------山[{"pname":"山东省","pid":5,"city":[]},{"pname":"山西省","pid":13,"city":[]}]

当然,书名号括起来的MyEscape不是Java自带的,不知道是哪位大神写的。

package utils;public class MyEscape {      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();      }  }

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