JavaScript中的“+”、“&”、“%”及其中文乱码问题
比如说在前段有一个输入框，输入框中的内容如：
??????????? %2B是“+”号，%26是“&”号，%20是“空格”， %25是“%”号
现在要想在ajax求情见此数据原样送到后台。
??????????? 那么我我们可以在ajax求情时作如下处理：
zaisu = encodeURI(encodeURI(zaisu));gentk = encodeURI(encodeURI(gentk));zaisu = zaisu.replace(/\+/g, "%2B");zaisu = zaisu.replace(/\&/g, "%26");gentk = gentk.replace(/\+/g, "%2B");gentk = gentk.replace(/\&/g, "%26");var queryString = "method=ajaxUpdate&zaiseq=" + zaiseq + "&gentk=" + gentk + "&zaisu=" + zaisu + "&genkn=" + genkn + "&linno="+linno + "&lockid=" + oldLockidId;//queryString = encodeURI(queryString);//queryString = encodeURI(queryString);xmlHttp.send(queryString);
?
而在服务器端：
String gentk = request.getParameter("gentk");String zaisu = request.getParameter("zaisu");zaisu = EscapeUtil.escape(zaisu);zaisu = URLDecoder.decode((LengthFormat.formatFullRLSpaceCut(zaisu)), "UTF-8");zaisu = EscapeUtil.unescape(zaisu);gentk....?
工具类：EscapeUtil
package com.sunrex.rexass.util;public class EscapeUtil {public static String escape(String src) {int i;char j;StringBuffer tmp = new StringBuffer();tmp.ensureCapacity(src.length() * 6);for (i = 0; i < src.length(); i++) {j = src.charAt(i);if (Character.isDigit(j) || Character.isLowerCase(j)|| Character.isUpperCase(j))tmp.append(j);else if (j < 256) {tmp.append("%");if (j < 16)tmp.append("0");tmp.append(Integer.toString(j, 16));} else {tmp.append("%u");tmp.append(Integer.toString(j, 16));}}return tmp.toString();}public static String unescape(String src) {StringBuffer tmp = new StringBuffer();tmp.ensureCapacity(src.length());int lastPos = 0, pos = 0;char ch;while (lastPos < src.length()) {pos = src.indexOf("%", lastPos);if (pos == lastPos) {if (src.charAt(pos + 1) == 'u') {ch = (char) Integer.parseInt(src.substring(pos + 2, pos + 6), 16);tmp.append(ch);lastPos = pos + 6;} else {ch = (char) Integer.parseInt(src.substring(pos + 1, pos + 3), 16);tmp.append(ch);lastPos = pos + 3;}} else {if (pos == -1) {tmp.append(src.substring(lastPos));lastPos = src.length();} else {tmp.append(src.substring(lastPos, pos));lastPos = pos;}}}return tmp.toString();}}?
或者
package com.sunrex;/** * JavaScript escape/unescape 编码的 Java 实现 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 wassbuf.append((char) ch);} else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it wassbuf.append((char) ch);} else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it wassbuf.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 %XXsbuf.append('%');sbuf.append(hex[ch]);} else { // unicode : map to %uXXXXsbuf.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 wassbuf.append((char) ch);} else if ('a' <= ch && ch <= 'z') { // 'a'..'z' : as it wassbuf.append((char) ch);} else if ('0' <= ch && ch <= '9') { // '0'..'9' : as it wassbuf.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 = "中文1234 abcd[]()<+>,.~\\";System.out.println(stest);System.out.println(escape(stest));System.out.println(unescape(escape(stest)));}}?