求助一个关于HttpServletResponse.setCharacterEncoding的问题，weblogic部署

Question

方法中设置了返回的字符集为UTF-8，response.setCharacterEncoding("UTF-8");
但是项目运行的时候报错，已经在项目下加入了j2ee-1.4.jar包，包里有这个方法，请问为什么报如下错误
错误提示：
java.lang.NoSuchMethodError: javax.servlet.http.HttpServletResponse.setCharacterEncoding(Ljava/lang/String;)V
at com.ztesoft.eoms.webservice.bjgdInterfaceServer.interfaceService.bjgdInterfaceService.doPost(bjgdInterfaceService.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1077)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:465)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:7053)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3902)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2773)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)

Answer 1

tomcat目录下，lib文件夹中就有那两个包，servlet-api.jar和jsp-api.jar

项目-->右键-->properties-->java build bath-->Libraries
这里要保有这两个包。
如果你的没有，那么：add Library-->user Library-->user Libraties-->new-->名字-->选中-->add External Libraries-->找到你的Tomcat目录\lib，里面选中这两个包.