求助，求助。。。。

Question

我在jsp页面用jstl方法获取sevlet中链表blogs的值，可是获取不到，什么原因呢？代码如下：

Answer 1

执行之后，报这样的错误，什么意思呢？？？！！！严重: Servlet.service() for servlet BlogAddServlet threw exception
java.lang.NumberFormatException: For input string: "content"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at javax.el.ListELResolver.coerce(ListELResolver.java:166)
at javax.el.ListELResolver.getValue(ListELResolver.java:51)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
at org.apache.el.parser.AstValue.getValue(AstValue.java:118)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:925)
at org.apache.jsp.blogcontent_jsp._jspService(blogcontent_jsp.java:130)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
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:630)
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.servlet.BlogAddServlet.doPost(BlogAddServlet.java:48)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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 com.filter.CharartorFilter.doFilter(CharartorFilter.java:34)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
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:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

Answer 2

java.lang.NumberFormatException: For input string: "content"没法把这个转换成数字，里面一定有其他字符，你检查一下

Answer 3

就是说你有个地方要把"content"这个值转换成数字，所以出错了，你检查下是哪里用了Integer.parseInt()

Answer 4

"content"里面是字符啊，我要输出的就是字符，怎么可以转成数字呢？
还有就是我在jsp页面用jstl方法获取sevlet中链表blogs的值，为什么获取不到呢？
 

Answer 5

把在那里用到了content的代码贴出来看一下

Answer 6

你这个table应包含在</c:forEach>标签里面吧！

Answer 7

放在里面了也有问题，上面警告提示是：是不是我有哪个jar包没导入呀？我导入了这些jar包：还需要导入什么包呀？？

Answer 8

页面引入了标签吗？
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

Answer 9

debug一下你报错的行，java.lang.NumberFormatException: For input string: "content"里面获取的可能是字符串，不是数字。

Answer 10

standard.jar     没有导入