求帮助~~struts 2.3.4 文件上传，FileName，ContentType和File全为NULL

刚开始学Struts2，下午参照黑弓老师的视频写一个简单的文件上传模块，结果弄了一下午，File，FileName和ContentType全为null，实在搞不懂了，大家帮我看看，谢谢了！！ 
先贴代码： 
Fileupload.jsp代码
<%@ page language="java" contentType="text/html; charset=UTF-8"  
    pageEncoding="UTF-8"%>  
<%@taglib prefix="s" uri="/struts-tags" %>  
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
<title><s:text name="loginPage" /></title>  
</head>  
<body>  
    <s:form action="fileUpload" method="post" enctype="multipart/form-data">  
        选择文件：  
        <s:file name="upload"></s:file>  
        <s:submit></s:submit>  
    </s:form>  
</body>  
</html>  ---------------------------- 
Uploadaction.java代码
 
public class UploadAction extends ActionSupport {  
  
    private File upload;  
    private String uploadContentType;  
    private String uploadFileName;  
  
    public File getUpload() {  
        return upload;  
    }  
  
    public void setUpload(File upload) {  
        this.upload = upload;  
    }  
  
    public String getUploadContentType() {  
        return uploadContentType;  
    }  
  
    public void setUploadContentType(String uploadContentType) {  
        this.uploadContentType = uploadContentType;  
    }  
  
    public String getUploadFileName() {  
        return uploadFileName;  
    }  
  
  
    public void setUploadFileName(String uploadFileName) {  
        this.uploadFileName = uploadFileName;  
    }  
  
    public String execute() throws Exception {  
        System.out.println(uploadContentType + " : " + uploadFileName + "\n");  
        FileInputStream fis = new FileInputStream(upload);  
        FileOutputStream fos = new FileOutputStream("D:/" + uploadFileName);  
        byte[] buffer = new byte[1024];  
        int length = 0;  
        while((length = fis.read(buffer)) != -1) {  
            fos.write(buffer, 0, length);  
        }  
        fis.close();  
        fos.close();  
        return null;  
    }  
}  ------------------------ 
Struts.xml代码
 
<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE struts PUBLIC  
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"  
    "struts-2.3.dtd">  
<struts>  
    <constant name="struts.devMode" value="true"></constant>  
    <constant name="struts.configuration.xml.reload" value="true"></constant>  
    <constant name="struts.custom.i18n.resources" value="mess"></constant>  
    <constant name="struts.i18n.encoding" value="UTF-8"></constant>  
    <constant name="struts.multipart.saveDir" value="/tmp"></constant>  
  
    <package name="lee" extends="struts-default">  
        <action name="fileUpload" class="com.tt.www.action.UploadAction">  
            <result name="input">/fileUpload.jsp</result>  
        </action>  
        <action name="login" class="com.tt.www.action.LoginAction">  
            <result name="input">/login.jsp</result>  
            <result name="success">/success.jsp</result>  
            <result name="error">/error.jsp</result>  
        </action>  
    </package>  
</struts>  ---------------------- 
错误提示为： 
Struts Problem Report Struts has detected an unhandled exception: Messages:
File: java/io/FileInputStream.java 
Line number: 103 
Stacktraces java.lang.NullPointerException 
    java.io.FileInputStream.(FileInputStream.java:103) 
    com.abchina.www.action.UploadAction.execute(UploadAction.java:19) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    java.lang.reflect.Method.invoke(Method.java:597) 
    com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:453)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:292)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:255) 
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:211)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:90) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:320) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:192) 
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249) 
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54) 
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:511) 
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
 
 

解决方案 »

  1.   

    FileInputStream fis = new FileInputStream(upload);   是不是这一行报错了？ 
      

  2.   

    我在处理文件之前就先打印了imageContentType和imageFileName就显示为null，image也为Null，说明框架都没有把值自动给传进去，不知道是哪儿出了问题，唉
      

  3.   

    换个名字看看，不用upload呢，
      

  4.   

    换过名字了的，今天又看了一天还是没找到原因，一步一步地调试struts2的源代码，到后面看不太懂了急求帮助~~
      

  5.   

    调试到JakartaMultiPartRequest里面的processUpload方法的时候，一次for循环都没执行：
    private void processUpload(HttpServletRequest request, String saveDir) throws FileUploadException, UnsupportedEncodingException {
            for (FileItem item : parseRequest(request, saveDir)) {
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Found item " + item.getFieldName());
                }
                if (item.isFormField()) {
                    processNormalFormField(item, request.getCharacterEncoding());
                } else {
                    processFileField(item);
                }
            }
        }
    再往深调试，发现在执行序列执行到MultipartStream类的skipPreamble方法的discardBodyData()后直接抛出了一个MalformedStreamException异常，但是没有想到为什么 public boolean skipPreamble()
        throws IOException {
            // First delimiter may be not preceeded with a CRLF.
            System.arraycopy(boundary, 2, boundary, 0, boundary.length - 2);
            boundaryLength = boundary.length - 2;
            try {
                // Discard all data up to the delimiter.
                discardBodyData();            // Read boundary - if succeded, the stream contains an
                // encapsulation.
                return readBoundary();
            } catch (MalformedStreamException e) {
                return false;
            } finally {
                // Restore delimiter.
                System.arraycopy(boundary, 0, boundary, 2, boundary.length - 2);
                boundaryLength = boundary.length;
                boundary[0] = CR;
                boundary[1] = LF;
            }
        }
      

  6.   

    public String execute() throws Exception {
    String fileFullName = "";
    /*本句代码展示uploadContentType包含的信息
    在本程序中没有使用uploadContentType。
    */
    System.out.println("上传的文件类型是："+
    uploadContentType);
    // 如果文件目录不存在，则创建目录
    File dir = new File(uploadPath);
    if (!dir.exists())
    dir.mkdir();
    if (newFileName!=null&&!newFileName.equals("")) {
    fileFullName = uploadPath + newFileName;
    } else {
    // 获得上传文件名
    fileFullName = uploadPath + uploadFileName;
    }
    if (new File(fileFullName).exists()) {
    addFieldError("newFileName", "该文件已经存在，" +
    "请为文件指定一个新的文件名！");
    return INPUT;
    } else {
    // 完成文件从临时文件夹到目标文件夹的拷贝
    File target = new File(fileFullName);
    FileUtils.copyFile(upload, target);
    }
    return SUCCESS;
    }
      

  7.   

    楼上的TX，你贴的代码是Action的具体业务逻辑，我现在的问题是在处理具体业务逻辑之前都得不到框架自动包装在Action中的文件引用，文件类型和文件名等信息。
      

  8.   

    我重新装个tomcat试试，这些莫名其妙的问题真是折腾死人啊
      

  9.   

    谢谢楼上的哥们，我把下了个最新的tomcat7.0.29，重新配置好后把问题解决了，果然是莫名其妙的问题