[java.util.UnknownFormatConversionException: Conversion = 'F']

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我是靠谱客的博主怕孤独大雁，最近开发中收集的这篇文章主要介绍[java.util.UnknownFormatConversionException: Conversion = 'F']，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

异常信息：：

2009-12-02 09:57:35 [org.directwebremoting.impl.DefaultRemoter]-[WARN] Method execution failed:
java.util.UnknownFormatConversionException: Conversion = 'F'
at java.util.Formatter$FormatSpecifier.conversion(Formatter.java:2605)
at java.util.Formatter$FormatSpecifier.<init>(Formatter.java:2633)
at java.util.Formatter.parse(Formatter.java:2479)
at java.util.Formatter.format(Formatter.java:2413)
at java.util.Formatter.format(Formatter.java:2366)
at java.lang.String.format(String.java:2770)
at com.xm.itv.service.Impl.CategoryServiceImpl.getMovie(CategoryServiceImpl.java:172)
172行代码：
share_url=cmd=openbrowser&url=http://localhost:8080/xmitv/getFriendShare.php?mediCode=%s&username=%s
share_url = String.format(share_url,
URLEncoder.encode(list.get(i).getCode(), "UTF-8"),
URLEncoder.encode(session.getAttribute("member")+"", "UTF-8"));
在此处做强转时出现错误。
原因：因为share_url是一开始就定义好的，而在对share_url 进行format时，list循环第一次是有%s的，但是循环第二次的时候 %s已经被循环的第一次执行过了。找不到%s所以就会出现这样的参数错误。人家不需要参数你却强制给了参数。所以将share_url放到循环内就ok了。

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.directwebremoting.impl.ExecuteAjaxFilter.doFilter(ExecuteAjaxFilter.java:34)
at org.directwebremoting.impl.DefaultRemoter$1.doFilter(DefaultRemoter.java:428)
at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:431)
at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:283)
at org.directwebremoting.servlet.PlainCallHandler.handle(PlainCallHandler.java:52)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.xm.itv.filter.LoginFilter.doFilter(LoginFilter.java:93)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionContextCleanUp.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:619)
2009-12-02 09:57:35 [org.directwebremoting.dwrp.BaseCallMarshaller]-[WARN] --Erroring: batchId[0] message[java.util.UnknownFormatConversionException: Conversion = 'F']