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Java中正确解码用Javascript:escape()编码的中文字符

来源:中国IT实验室 作者:佚名 发表于:2013-07-15 15:21  点击:
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
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]
  /**
  * 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
  };

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