jsp验证码异常的解决方案

      用struts2+spring2+ibatis2做一个demo项目，在做登陆的时候想放验证码。但是出现以下异常：

2007-04-25 21:29:27,231 ERROR [org.apache.catalina.core.ContainerBase.[Catalina]
.[localhost].[/mydemoweb].[jsp]] - Servlet.service() for servlet jsp threw excep
tion
java.lang.IllegalStateException: getOutputStream() has already been called for t
his response
        at org.apache.catalina.connector.Response.getWriter(Response.java:601)
        at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade
.java:196)
        at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:12
5)
        at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.jav
a:118)
        at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.jav
a:185)
        at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(J
spFactoryImpl.java:116)
        at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactor
yImpl.java:76)
        at org.apache.jsp.image_jsp._jspService(image_jsp.java:133)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:328)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
15)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:269)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:188)
        at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatc
her.java:414)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:215)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:188)
        at org.apache.struts2.dispatcher.ActionContextCleanUp.doFilter(ActionCon
textCleanUp.java:99)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:215)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:188)
        at filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter
.java:123)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:215)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:188)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:210)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:174)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:117)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:108)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:151)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:870)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:665)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:528)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFol
lowerWorkerThread.java:81)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:685)
        at java.lang.Thread.run(Thread.java:595)

          一大块一出来人都傻了。找了一个下午的baidu,goole终于找到了解决方案。答案没有像我们有些网友说的那么复杂

就在IMAGE.JSP的末尾加两行代码就足够了。

        代码如下：

                        out.clear();
                        out = pageContext.pushBody();

     然后就搞定了。

     嘿嘿。。。。自己做个帖子以后好查。希望对大家有帮助。