为什么我的文件没有上传到我的java servlet？

时间：2012-06-04 21:54:06

标签： java servlets file-upload upload webpage

我正在尝试从Web界面将文件上传到我的servlet。我通过遵循教程并将其集成到我的servlet中来使用Apache Commons FileUpload。不知怎的，我无法设法上传文件。

这是我在网页上的表单：

<form class="well" action="GenTreeUploader" method="post" enctype="multipart/form-data">
        <label>Choose your file:</label>
        <center><input type="file" class="input-xlarge" name="wordfile"></center><br>
        <center><span class="help-block">Note: after clicking "Upload file!" all of the data contained in the file will be uploaded to the database</span></center><br>
        <center><input class="btn btn-primary" type="submit" value="Upload file!"></center>  
        <input type="text" name="tester" value="xoxoxo" />
        <input type="hidden" name="action" value="startUpload" />
    </form>

然后，这是我应该处理来自请求的文件上传的servlet的代码部分：

public void artiUpload(HttpServletRequest request, HttpServletResponse response, HtmlWriter writer) throws ServletException, IOException {
    System.out.println("I'm in upload");
    PrintWriter out = response.getWriter();
    // Check that we have a file upload request
    boolean isMultipart = ServletFileUpload.isMultipartContent(request);
    // Create a factory for disk-based file items

    // Create a factory for disk-based file items
    DiskFileItemFactory factory = new DiskFileItemFactory();

    // Set factory constraints
    factory.setSizeThreshold(maxMemSize);
    factory.setRepository(new File(htmlPath.toString()));
    System.out.println("File path: " + htmlPath.toString());

    // Create a new file upload handler
    ServletFileUpload upload = new ServletFileUpload(factory);

    // Set overall request size constraint
    upload.setSizeMax(maxFileSize);
    System.out.println("Max file size: " + maxFileSize);
    System.out.println("Max file size in memory: " + maxMemSize);
    List items = null;
    try {
        // Parse the request
        items = upload.parseRequest(request);
        System.out.println("Items found: " + items.size());
        out.write(writer.printCenter("File uploading done"));
    } catch (FileUploadException ex) {
        Logger.getLogger(GenTreeUploader.class.getName()).log(Level.SEVERE, null, ex);
        out.write(writer.printCenter("File uploading failed"));
    }
}

这是我从这个servlet方法得到的Tomcat服务器日志：

I'm in upload
File path: D:\Dropbox\StudiesNew\NetbeansProjects\GenTreeUploader\build\web\WEB-INF\classes\Html
Max file size: 10485760
Max file size in memory: 2097152
Items found: 0

我还可以通过以下方式从请求中获取一些参数： action = request.getParameter（actionText）;

使用普通参数可以正常工作，但文件没有上传。我相信在解析列表后，在这种情况下应该有一个项目，它显示0 ...

有人可以帮忙吗？感谢。

完整的日志是这个吗？

 Using CATALINA_BASE:   "C:\Users\Arturas\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base"
Using CATALINA_HOME:   "C:\Program Files\Apache Software Foundation\Apache Tomcat 7.0.22"
Using CATALINA_TMPDIR: "C:\Users\Arturas\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\temp"
Using JRE_HOME:        "C:\Program Files\Java\jdk1.7.0_03"
Using CLASSPATH:       "C:\Program Files\Apache Software Foundation\Apache Tomcat 7.0.22\bin\bootstrap.jar;C:\Program Files\Apache Software Foundation\Apache Tomcat 7.0.22\bin\tomcat-juli.jar"
Bir 05, 2012 2:45:06 AM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jdk1.7.0_03\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Live\Shared;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files\Microsoft SQL Server\110\DTS\Binn\;C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn\;C:\Program Files\MATLAB\R2010b\runtime\win64;C:\Program Files\MATLAB\R2010b\bin;.
Bir 05, 2012 2:45:07 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8084"]
Bir 05, 2012 2:45:07 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Bir 05, 2012 2:45:07 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 865 ms
Bir 05, 2012 2:45:07 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Bir 05, 2012 2:45:07 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.22
Bir 05, 2012 2:45:07 AM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor GenTreeUploader.xml from C:\Users\Arturas\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\conf\Catalina\localhost
Bir 05, 2012 2:45:08 AM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor manager.xml from C:\Users\Arturas\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\conf\Catalina\localhost
Bir 05, 2012 2:45:08 AM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor mrweb.xml from C:\Users\Arturas\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\conf\Catalina\localhost
Bir 05, 2012 2:45:08 AM org.apache.catalina.startup.HostConfig deployDescriptor
INFO: Deploying configuration descriptor ROOT.xml from C:\Users\Arturas\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\conf\Catalina\localhost
Bir 05, 2012 2:45:08 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8084"]
Bir 05, 2012 2:45:08 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Bir 05, 2012 2:45:08 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 1396 ms
I'm in upload
File path: D:\Dropbox\StudiesNew\NetbeansProjects\GenTreeUploader\build\web\WEB-INF\classes\Html
Max file size: 10485760
Max file size in memory: 2097152
Items found: 0

1 个答案:

答案 0 :(得分：4)

通过在getParameter()内getReader()上调用getInputStream()，request或doPost()方法预先解析请求正文时，它将失败同一个servlet的方法或其中一个servlet过滤器的doFilter()方法，它也在同一个请求上运行。另一个可能的原因是您正在嵌套HTML <form>元素，但行为取决于浏览器。

顺便说一下，自1998年以来，HTML <center>元素已被弃用。摆脱它并使用CSS代替。

更新：您的更新确认您在getParameter()上呼叫request。如果是multipart/form-data请求，您应该不这样做。您应该使用完全相同的Apache Commons FileUpload API来收集普通表单字段。另请参阅How to upload files to server using JSP/Servlet?

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