当迁移到Struts2 2.3.14.2时，流结果不再工作 [英] When migrating to Struts2 2.3.14.2, Stream result doesn't work anymore

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本文介绍了当迁移到Struts2 2.3.14.2时，流结果不再工作的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

在更新到struts2-core-2.3.14.2之后，它会在下载过程中出现以下错误：流结果：

After updating to struts2-core-2.3.14.2, it gives me the following error during a download with Stream result:

Servlet.service() for servlet [default] in context with path [] threw exception [Filter execution threw an exception] with root cause
    java.lang.AbstractMethodError: org.apache.struts2.dispatcher.StrutsResultSupport$1.evaluate(Ljava/lang/Object;)Ljava/lang/Object;
        at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:187)
        at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:118)
        at com.opensymphony.xwork2.util.TextParseUtil.translateVariables(TextParseUtil.java:62)
        at org.apache.struts2.dispatcher.StrutsResultSupport.conditionalParse(StrutsResultSupport.java:198)
        at org.apache.struts2.dispatcher.StreamResult.doExecute(StreamResult.java:270)
        at org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:186)
        at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:361)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:265)
        at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:163)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:251)
        at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:148)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:128)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
        at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:164)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:128)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
        at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:236)
        at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
        at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:546)
        at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:168)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:183)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:138)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
        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.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:987)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)

Struts.xml

Struts.xml

 <action name="download"  
        class="ab.action.DownloadAction"
        method="download">
        <result name="success" type="stream">
           <param name="contentDisposition">attachment;filename="${fileName}"</param>
           <param name="inputName">downloadFile</param>
        </result>
    </action>

行动

 //filePathName is example
    Strin filePathName="/home/download/aaa.txt";
    public String getFileName()
    {
       File f = new File(filePathName);
       String fileRealName = new String(f.getName()); //get filename
       return fileRealName;
    }

    public InputStream getDownloadFile() 
    {
        File file  =   new  File(filePathName);  
        //get inputstream
        InputStream fis  =   new  BufferedInputStream( new  FileInputStream(filePathName));  
        return fis;
    }

    public String download() throws Exception 
    {
       return SUCCESS; //just return ok
    }

库

xwork-core-2.3.14.2.jar
struts2-core-2.3.14.2.jar
commons-fileupload-1.2.2.jar


推荐答案

似乎很好，除了几件事情： / p>

It seems fine except that for a couple of things:


  1. 指定contentType：

  1. Specify the contentType:

<result name="success" type="stream">
   <param name="contentType">text/plain</param>
   <param name="contentDisposition">attachment;filename="${fileName}"</param>
   <param name="inputName">downloadFile</param>
</result>

text / plain是默认的，在你的例子中你有一个txt文件，但是更好在配置中显式显示;

text/plain is the default, and in your example you have a txt file, but it is better to explicit it in the configuration;

按照 JavaBeans约定;一个getter不应该有逻辑，并且该名称应该与返回的私有变量之一相匹配：

Follow the JavaBeans Conventions; a getter should not have logic, and the name should match the one of the private variable returned:

例如，

String foo;
public String getBar(){ 
    return this.foo; 
}

无效，可能会导致Struts2（内部使用Reflection）的问题）

is not valid and may cause problems to Struts2 (that makes use of Reflection internally)

然后尝试更改您的Action代码，如下所示：

Then try changing your Action code like this:

String filePathName="/home/download/aaa.txt";
String fileName;
InputStream donwloadFile;

public String getFileName() {
   return this.fileName;
}

public InputStream getDownloadFile() {
    return this.downloadFile;
}

public String download() throws Exception {
   File file = new File(filePathName);       
   this.fileName = file.getName();
   this.downloadFile = new BufferedInputStream(new FileInputStream(file));
   return SUCCESS;
}


这篇关于当迁移到Struts2 2.3.14.2时，流结果不再工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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