我在JSF 2中尝试iReport/JasperReport但是当我生成PDF时我得到了这个错误.我搜索并发现了一些类似的问题和解决方案,但没有任何效果.很抱歉再次发布相同的问题.但我尝试了所有可能的解决方案,但没有一个对我有用.请帮忙
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:637)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:214)
at com.sun.faces.context.ExternalContextImpl.getResponseOutputWriter(ExternalContextImpl.java:723)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.createResponseWriter(FaceletViewHandlingStrategy.java:1009)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:382)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:124)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
以下是功能
public void init() throws IOException, JRException {
JRBeanCollectionDataSource beanCollectionDataSource = new JRBeanCollectionDataSource(listReportObjects);
ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext(); …我使用Netbeans的jasper报表插件制作报表，我使用JDialog中的按钮显示我的jasper报表。但是该报告又显示在我的JDialog上，这是什么问题？
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Map<String, Object> params = new HashMap <>();
try {
Connection kon = DriverManager.getConnection(database,user,pass);
JasperDesign jasperDesign = JRXmlLoader.load("Myreports.jrxml");
JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, params, kon);
JasperViewer jasperViewer = new JasperViewer(jasperPrint, false);
jasperViewer.setTitle("My Reports");
jasperViewer.setVisible(true);
} catch (SQLException | JRException e){
e.printStackTrace();
}
}
我像这样添加setModal：
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
Map<String, Object> params = new HashMap <>();
try { …