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在Java中正确解码用Javascript:escape()编码的中文字符  

2015-09-03 18:45:43|  分类: 默认分类 |  标签: |举报 |字号 订阅

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在Java中正确解码用Javascript:escape()编码的中文字符

分类: Java编程 2010-05-19 15:19 14533人阅读 评论(17) 收藏 举报

javascriptjavastringservlethexc

????? 做页面开发时使用了Javascript的escape()函数进行URL编码,如果url中有中文,结果在JSP或Servlet中用request.getParameter()时取不到参数,只返回一个空值。经过Baidu的搜索,结合我自己的工作实际,再加上网友的一些帮助,终于找到了问题所在及解决的办法。

??????? 本来Javascript中的escape()是将中文按ISO-8859-1字符集进行URL编码的,那样通过 request.getParameter()是能直接获取到请求参数的,但后来的Javascript将escape()换成了Unicode字符集编 码,如此一来,在JSP和Servlet中就没法直接拿到请求参数了,而且此时的request获得的参数值都是空值,想了好久,也测试了不少,但是还是百思不得其解。 最后借助于网络,终于解决了此问题,我露出了灿烂的笑容?

??????? 解决办法:

??????? 1、首先对中文字符进行两次escape()编码,如要传参数name,值为“黄修群”,则url的格式为....name=escape(escape("黄修群")),这样一来,在request.getParameter()就能取到编码后的参数了,但是参数去编码的形式:如下:

%u9EC4%u4FEE%u7FA4,

获得的页面参数为:获取request参数值-->%u9EC4%u4FEE%u7FA4

此时在使用java.net.URIDecoder.decode()方法,则出现解码错误,错误信息如下:

2010-5-19 15:28:03 org.apache.catalina.core.ApplicationDispatcher invoke
严重: 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)

可见是解码出现了问题了

也许有人问,那我在客户端非要只用一次escape方法编码,会出现什么样的结果?请看下面:

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)

。。。。。

看到上面的提示信息,可以断定是解码出现问题了,而获得的请求对象去是空的,如下:

获取request参数值-->null

??????? 2、由于取到的参数是? u9EC4%u4FEE%u7FA4格式的,没法用常规的URLDecoder.decode()来进行解码,还好,这世上的牛人够多,在网上直接找到了一个工具类,能实现 Javascript中escape()及unescape()式的编解码,源代码如下:

[java] view plaincopyprint?

  1. /**
  2. * JavaScript escape/unescape 编码的 Java 实现
  3. * author jackyz
  4. * keep this copyright info while using this method by free
  5. */
  6. public class Escape {?
  7. private final static String[] hex = {?
  8. "00","01","02","03","04","05","06","07","08","09","0A","0B","0C","0D","0E","0F",?
  9. "10","11","12","13","14","15","16","17","18","19","1A","1B","1C","1D","1E","1F",?
  10. "20","21","22","23","24","25","26","27","28","29","2A","2B","2C","2D","2E","2F",?
  11. "30","31","32","33","34","35","36","37","38","39","3A","3B","3C","3D","3E","3F",?
  12. "40","41","42","43","44","45","46","47","48","49","4A","4B","4C","4D","4E","4F",?
  13. "50","51","52","53","54","55","56","57","58","59","5A","5B","5C","5D","5E","5F",?
  14. "60","61","62","63","64","65","66","67","68","69","6A","6B","6C","6D","6E","6F",?
  15. "70","71","72","73","74","75","76","77","78","79","7A","7B","7C","7D","7E","7F",?
  16. "80","81","82","83","84","85","86","87","88","89","8A","8B","8C","8D","8E","8F",?
  17. "90","91","92","93","94","95","96","97","98","99","9A","9B","9C","9D","9E","9F",?
  18. "A0","A1","A2","A3","A4","A5","A6","A7","A8","A9","AA","AB","AC","AD","AE","AF",?
  19. "B0","B1","B2","B3","B4","B5","B6","B7","B8","B9","BA","BB","BC","BD","BE","BF",?
  20. "C0","C1","C2","C3","C4","C5","C6","C7","C8","C9","CA","CB","CC","CD","CE","CF",?
  21. "D0","D1","D2","D3","D4","D5","D6","D7","D8","D9","DA","DB","DC","DD","DE","DF",?
  22. "E0","E1","E2","E3","E4","E5","E6","E7","E8","E9","EA","EB","EC","ED","EE","EF",?
  23. "F0","F1","F2","F3","F4","F5","F6","F7","F8","F9","FA","FB","FC","FD","FE","FF"
  24. ??? };?
  25. private final static byte[] val = {?
  26. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  27. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  28. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  29. 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  30. 0x3F,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  31. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  32. 0x3F,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  33. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  34. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  35. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  36. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  37. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  38. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  39. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  40. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,?
  41. 0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F
  42. ??? };?
  43. public static String escape(String s) {?
  44. ??????? StringBuffer sbuf = new StringBuffer();?
  45. int len = s.length();?
  46. for (int i = 0; i < len; i++) {?
  47. int ch = s.charAt(i);?
  48. if (ch == ' ') {??????????????????????? // space : map to '+'
  49. ??????????????? sbuf.append('+');?
  50. ??????????? } else if ('A' <= ch && ch <= 'Z') {??? // 'A'..'Z' : as it was
  51. ??????????????? sbuf.append((char)ch);?
  52. ??????????? } else if ('a' <= ch && ch <= 'z') {??? // 'a'..'z' : as it was
  53. ??????????????? sbuf.append((char)ch);?
  54. ??????????? } else if ('0' <= ch && ch <= '9') {??? // '0'..'9' : as it was
  55. ??????????????? sbuf.append((char)ch);?
  56. ??????????? } else if (ch == '-' || ch == '_' // unreserved : as it was
  57. ??????????????? || ch == '.' || ch == '!'
  58. ??????????????? || ch == '~' || ch == '*'
  59. ??????????????? || ch == '/'' || ch == '('?
  60. ??????????????? || ch == ')') {?
  61. ??????????????? sbuf.append((char)ch);?
  62. ??????????? } else if (ch <= 0x007F) {????????????? // other ASCII : map to %XX
  63. ??????????????? sbuf.append('%');?
  64. ??????????????? sbuf.append(hex[ch]);?
  65. ??????????? } else {??????????????????????????????? // unicode : map to %uXXXX
  66. ??????????????? sbuf.append('%');?
  67. ??????????????? sbuf.append('u');?
  68. ??????????????? sbuf.append(hex[(ch >>> 8)]);?
  69. ??????????????? sbuf.append(hex[(0x00FF & ch)]);?
  70. ??????????? }?
  71. ??????? }?
  72. return sbuf.toString();?
  73. ??? }?
  74. public static String unescape(String s) {?
  75. ??????? StringBuffer sbuf = new StringBuffer();?
  76. int i = 0;?
  77. int len = s.length();?
  78. while (i < len) {?
  79. int ch = s.charAt(i);?
  80. if (ch == '+') {??????????????????????? // + : map to ' '
  81. ??????????????? sbuf.append(' ');?
  82. ??????????? } else if ('A' <= ch && ch <= 'Z') {??? // 'A'..'Z' : as it was
  83. ??????????????? sbuf.append((char)ch);?
  84. ??????????? } else if ('a' <= ch && ch <= 'z') {??? // 'a'..'z' : as it was
  85. ??????????????? sbuf.append((char)ch);?
  86. ??????????? } else if ('0' <= ch && ch <= '9') {??? // '0'..'9' : as it was
  87. ??????????????? sbuf.append((char)ch);?
  88. ??????????? } else if (ch == '-' || ch == '_' // unreserved : as it was
  89. ??????????????? || ch == '.' || ch == '!'
  90. ??????????????? || ch == '~' || ch == '*'
  91. ??????????????? || ch == '/'' || ch == '('?
  92. ??????????????? || ch == ')') {?
  93. ??????????????? sbuf.append((char)ch);?
  94. ??????????? } else if (ch == '%') {?
  95. int cint = 0;?
  96. if ('u' != s.charAt(i+1)) {???????? // %XX : map to ascii(XX)
  97. ??????????????????? cint = (cint << 4) | val[s.charAt(i+1)];?
  98. ??????????????????? cint = (cint << 4) | val[s.charAt(i+2)];?
  99. ??????????????????? i+=2;?
  100. ??????????????? } else {??????????????????????????? // %uXXXX : map to unicode(XXXX)
  101. ??????????????????? cint = (cint << 4) | val[s.charAt(i+2)];?
  102. ??????????????????? cint = (cint << 4) | val[s.charAt(i+3)];?
  103. ??????????????????? cint = (cint << 4) | val[s.charAt(i+4)];?
  104. ??????????????????? cint = (cint << 4) | val[s.charAt(i+5)];?
  105. ??????????????????? i+=5;?
  106. ??????????????? }?
  107. ??????????????? sbuf.append((char)cint);?
  108. ??????????? }?
  109. ??????????? i++;?
  110. ??????? }?
  111. return sbuf.toString();?
  112. ??? }?
  113. public static void main(String[] args) {?
  114. ??????? String stest = "黄修群1234 abcd[]()<+>,.~//";?
  115. ??????? System.out.println(stest);?
  116. ??????? System.out.println(escape(stest));?
  117. ??????? System.out.println(unescape(escape(stest)));?
  118. ??? }?
  119. }?

/** * 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 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 = "黄修群1234 abcd[]()<+>,.~//"; System.out.println(stest); System.out.println(escape(stest)); System.out.println(unescape(escape(stest))); } }

代码运行如下:

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

有了这个工具类,直接用Escape.unescape()方法就能将获取到的参数解码成中文格式了。

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

结果输出了:黄修群

幸福吧,哈哈!

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