javascript通过url向jsp页面传递中文参数导致乱码解决方案

前端技术 2023/09/03 JSP
2013-1-16 10:35:49 org.apache.tomcat.util.http.Parameters processParameters
警告: Parameters: Character decoding failed. Parameter \'id\' with value \'%u8BA2%u5355\' has been ignored. Note that the name and value quoted here may corrupted due to the failed decoding. Use debug level logging to see the original, non-corrupted values.
Enter Servlet Get Method..
OK：
2013-1-16 10:35:49 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet suggest threw exception
java.lang.NullPointerException
at com.ont.demo.suggest.doGet(suggest.java:25)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)

解决方法：在传递参数前将中文参数进行两次编码，jsp页面获取参数后对中文参数进行一次解码，中文参数就不会变为乱码了！

参考例子：
复制代码 代码如下:

<%@ page language=\"java\" contentType=\"text/html; charset=UTF-8\"
pageEncoding=\"UTF-8\"%>
<%@ page import=\"java.net.*\" %>
<%
String str0=\"\";
String str1=\"\";
if(request.getParameter(\"param0\")!=null){
str0=request.getParameter(\"param0\");//直接获取中文参数
}
try{
if(request.getParameter(\"param1\")!=null){
str1=URLDecoder.decode(request.getParameter(\"param1\"),\"utf-8\");//对中文参数进行解码
}
}catch(Exception e){
e.printStackTrace();
}
%>
<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">
<html>
<head>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">
<script type=\"text/javascript\">
var str=\"你好\";
function test0(){
window.location=\"Test.jsp?param0=\"+str;//直接传递中文参数
}
function test1(){
window.location=\"Test.jsp?param1=\"+encodeURI(encodeURI(str));//对中文参数进行双层编码后再传递
}
</script>
</head>
<body>
<input value=<%=str0 %>>
<input type=\"button\" value=\"乱码\" onclick=\"test0()\"><br>
<input value=<%=str1 %>>
<input type=\"button\" value=\"正常\" onclick=\"test1()\">
</body>
</html>

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