错误：is quoted with which must be escaped when used within the value
严重: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /index.jsp(43,38) Attribute value request.getAttribute("lineSize") is quoted with " which must be escaped when used within the value
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:198)
at org.apache.jasper.compiler.Parser.parseQuoted(Parser.java:299)
at org.apache.jasper.compiler.Parser.parseAttributeValue(Parser.java:249)
at org.apache.jasper.compiler.Parser.parseAttribute(Parser.java:211)
at org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:154)
at org.apache.jasper.compiler.Parser.parseParam(Parser.java:845)
at org.apache.jasper.compiler.Parser.parseBody(Parser.java:1678)
at org.apache.jasper.compiler.Parser.parseOptionalBody(Parser.java:1020)
at org.apache.jasper.compiler.Parser.parseInclude(Parser.java:872)
at org.apache.jasper.compiler.Parser.parseStandardAction(Parser.java:1134)
at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1461)
at org.apache.jasper.compiler.Parser.parse(Parser.java:137)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:170)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at com.miyao.web.PersonServlet.doGet(PersonServlet.java:86)
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:128)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)
2010-1-6 20:08:39 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet PersonServlet threw exception
org.apache.jasper.JasperException: /index.jsp(43,38) Attribute value request.getAttribute("lineSize") is quoted with " which must be escaped when used within the value
at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
at org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
at org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:198)
at org.apache.jasper.compiler.Parser.parseQuoted(Parser.java:299)
at org.apache.jasper.compiler.Parser.parseAttributeValue(Parser.java:249)
at org.apache.jasper.compiler.Parser.parseAttribute(Parser.java:211)
at org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:154)
at org.apache.jasper.compiler.Parser.parseParam(Parser.java:845)
at org.apache.jasper.compiler.Parser.parseBody(Parser.java:1678)
at org.apache.jasper.compiler.Parser.parseOptionalBody(Parser.java:1020)
at org.apache.jasper.compiler.Parser.parseInclude(Parser.java:872)
at org.apache.jasper.compiler.Parser.parseStandardAction(Parser.java:1134)
at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1461)
at org.apache.jasper.compiler.Parser.parse(Parser.java:137)
at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:255)
at org.apache.jasper.compiler.ParserController.parse(ParserController.java:103)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:170)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
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.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at com.miyao.web.PersonServlet.doGet(PersonServlet.java:86)
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:128)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)
大家会清楚的看到:/index.jsp(43,38) Attribute value request.getAttribute("lineSize") is quoted with " which must be escaped when used within the value.这句话,很清楚的说明了错误发生在哪里!
于是,我们会顺着错误提示杀到代码中去检查(index.jsp),找到相应的行后,一看,发现没有错误呀,我的代码很正确呀,没有写错代码,也没有少了符号,而且""号也是正确的呀.大家可以看一下,以下就是提示错误的代码:
41 <jsp:include page="split_page.jsp">
42 <jsp:param name="jspUrl" value="<%=jspUrl %>"/>
43 <jsp:param name="lineSize" value="<%=request.getAttribute("lineSize") %>"/>
44 <jsp:param name="allRecorders" value="<%=request.getAttribute("allRecorders") %>"/>
45 <jsp:param name="keyWord" value="<%=request.getAttribute("keyWord") %>"/>
46 <jsp:param name="currentPage" value="<%=request.getAttribute("currentPage") %>"/>
47 <jsp:param name="searchFlag" value="T"/>
48 </jsp:include>
看到了吗?是的,就是这一段动态包含的代码.就像我说的,大家也看见了,43行,照常规,我们没有看出任何错误之处,对比一下其它行也都很相似.
所以,这下就把我急坏了,改了好久还是不行...最后,就想到了百老师和谷老师,就把错误信息一贴,发现已经有此问题的解决了,我打开了几个看了一下,上面基本都和我遇到的问题一样...这下就让我大开眼界了...上面说是,只要把出错位置的value=""改成value='',就不会有错了,但上面都没有说明到底是为什么?我也没管,就照上面的改一下试试...改了以后,一运行,还是出错了...但大家别急,错误的行号变了,变成了44行...也就是43行已经没有错了.是的,44行的value还不有改,我就又改了...再一运行,又出错了,而且错误的行号又变了,是的,没错,变成了45行,这下就让我觉得有意思了...我再改了45行后,我遇见性的想到如果不改46行可能还会出错,但我没有急着改,因为我想证明一下自己的想法...一运行,果然如此,45行正确了,46行出错了,哈哈.就这样,改了最后一个46行,再运行,一切正常了!!!!
大家看到这里可能也都有点晕了吧!不过,这个时候,我再仔细看一下,43行/44行/45行/46行有一个共同点,我们都知道,在定义属性时,一般,我们都是要加双引号""的,是的,他们的属性都加了双引号,而且仔细一看,在属性中拿到servlet中的request中的值时(就以43行为例):request.getAttribute("lineSize"),这里我们也为"lineSize"加上了双引号,这也是没有错的.44/45/46也都是这个样子!就是这里,以我们先前所学的知识,毫无错误,也不会想到是这里出错了!但,错误就是这里导致的.
其实,大家回忆一下,我们应该是知道这个原则的,在双引号里再写双引号是会冲突的,是不正确的.但是大家要仔细看了,我们这里面是没有双引号接着双引号写的,我们是在另一个代码中写的双引号,所以,是没有错误的!
让我们再回头看一个错误提示中的英文吧: /index.jsp(43,38) Attribute value request.getAttribute("lineSize") is quoted with " which must be escaped when used within the value.试着翻译一下,大概意思就是:引用“时必须在属性内避免使用".这一下,可能更晕了...
我们再想一想,value中写属性时,我们即可以用双引号",也可以用单引号'.
在这里也没有官方资料可以查阅,我想的话,最有可能应该是,Tomcat无法解析像43/44/45/46这种情况(如:value="<%=request.getAttribute("lineSize") %>"),双引号中还嵌入的有双引号...然后,我们再进一步分析,request.getAttribute("lineSize")中有能用双引号,是不能用单引号的,而value的双引号是可以修改成单引号的,所以,这可能也就是为什么,当我们在这种特殊的情况下,在value的属性中双引号时会出现这种错误,而当我们改成单引号时,程序确一切正常了!
其实,我们回头仔细想一想,这也不是我的推断,光看错误信息,现在想一想,其实,也就是这个原因了吧!
如有哪个高手,也遇到过这种问题,并且知道真正的原因,且我说的有问题的地方,请帮我指正一下,并批评我一下!在此,先感谢您了!我在这,也是总结一下问题,供自己学习用!希望也能帮助到遇到此困难的人!
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