想把${index.name}转换成java.net.URLEncoder.encode(${index.name},"utf-8");怎么写才对

Question

如题
<c:forEach  items="${nbcsList}" var="index">
  <%String cp = java.net.URLEncoder.encode(${index.name},"utf-8");%>
<li><a onfocus="this.blur()" target="_blank" href="<%=basePath%>index/index_getIndexById.action?id=${index.id }&leaf=<%=cp%>">${index.name }</a></li></c:forEach>

Answer 1

el只能这么搞, 毕竟不是ognl, 像这种东西你应该在后台做处理的, 而不应该放界面!
应该在Servlet中对这个index.name处理好了再给界面显示!

Answer 2

要不统一使用el表示达，要么直接使用java的语句块，你不能在java的语句块中嵌套el表达式。
将encode方法扩充一下，搞个自定义的表达式来实现此功能。你这样写是错误的。

Answer 3

试下
<%
pageContext.setAttribute("uriEncoder",java.net.URLEncoder);
%>${uriEncoder.encode(index.name,'utf-8') }

Answer 4

报错
org.apache.jasper.JasperException: /index.jsp(459,126) The function encode must be used with a prefix when a default namespace is not specified 
    org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
    org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
    org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
    org.apache.jasper.compiler.Validator$ValidateVisitor$1FVVisitor.visit(Validator.java:1478)
    org.apache.jasper.compiler.ELNode$Function.accept(ELNode.java:129)
    org.apache.jasper.compiler.ELNode$Nodes.visit(ELNode.java:200)
    org.apache.jasper.compiler.ELNode$Visitor.visit(ELNode.java:242)
    org.apache.jasper.compiler.ELNode$Root.accept(ELNode.java:56)
    org.apache.jasper.compiler.ELNode$Nodes.visit(ELNode.java:200)
    org.apache.jasper.compiler.Validator$ValidateVisitor.validateFunctions(Validator.java:1503)
    org.apache.jasper.compiler.Validator$ValidateVisitor.prepareExpression(Validator.java:1508)
    org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:724)
    org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:935)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
    org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2386)
    org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:838)
    org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1507)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
    org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2386)
    org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2392)
    org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2336)
    org.apache.jasper.compiler.Validator.validate(Validator.java:1737)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:178)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
    org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
    org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
    org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
    org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute(ServletDispatcherResult.java:154)
    org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
    com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:362)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:266)
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    java.lang.Thread.run(Thread.java:619)
    --------------------------------------------------------------------------------

Answer 5

在你的web-inf下建一个tld文件
内容如下<?xml version="1.0" encoding="UTF-8" ?>
<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
<description>xxx</description>
<display-name>xxx</display-name>
<tlib-version>1.1</tlib-version>
<short-name>xx</short-name>
<uri>http://www.xxx.com/</uri>
<function>
<name>encode</name>
<function-class>java.net.URLEncoder</function-class>
<function-signature>java.lang.String encode(java.lang.String,java.lang.String)</function-signature>
</function>
</taglib>
在你的jsp里写
<%@ taglib uri="http://www.xxx.com/" prefix="xx"%>
${xx:encode(index.name,'utf-8')}

Answer 6

老版本需要在web.xml里注册
在web-app 也就是根节点下
  <taglib>
<taglib-uri>http://www.xxx.com/</taglib-uri>
<taglib-location>/WEB-INF/xxx.tld</taglib-location>
  </taglib>
其中http://www.xxx.com/和前面回答的一样 随便写 哪怕你写成aaa都可以
在jsp就一样了
<%@ taglib uri="http://www.xxx.com/" prefix="xx"%>
${xx:encode(index.name,'utf-8')}

Answer 7

试下
<%
pageContext.setAttribute("uriEncoder",java.net.URLEncoder);
%>${uriEncoder.encode(index.name,'utf-8') } 
这句话还要吗