Question

我知道它被多次询问，但我无法解决问题。

Bean类

@Component
@Scope("prorotype")
public class NotesData {
    //with getters/setters
    String college;
    String topic;
    String subject;
    String description;
    MultipartFile file;

}

JSP

<form:form action="/upload" method="post" enctype="multipart/form-data" modelAttribute="notesData">
    <form:input path="file" name="file" type="file" />
    <form:input path="description" name="description" type="text" />
    <div>colleges</div>
    <form:select path="college" name="college">
        <c:forEach var="entry" items="${colleges}">
                <option value="${entry.key}">${entry.key}</option>
        </c:forEach>
    </form:select>
    <input type="Submit" value="Submit">
</form:form>

控制器：

@RequestMapping(value="/upload", method = RequestMethod.POST)
public String uploadFile(@ModelAttribute("notesData") NotesData nd, ModelMap model, BindingResult br, HttpServletRequest request) {
    //TODO: Check why modelAttribute is not working.
    System.out.println("Inside post " + nd);
    System.out.println(request.getParameterMap());
    model.addAttribute("subjects", getSubjects());
    model.addAttribute("colleges", getColleges());
    return "upload";
}

在提交表单时，请求即将发送给控制器，但值不会出现。除了@ModelAttribute之外，我还传递了 HttpServletRequest ，但这也是空的。

问题似乎与GAE和MultipartUpload不兼容。我尝试使用GMultipart，但后来我继续获得以下异常：

java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemHeadersSupport
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:215)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at org.gmr.web.multipart.GFileItemFactory.createItem(GFileItemFactory.java:47)
    at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:350)
    at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)

我在lib文件夹中添加了以下jar：

1. commons-fileuplaod-1.2
2. commons-io-2.0
3. gmultipart-0.4

我做错了什么？任何替代方案或解决方案？

JSP文件上传未传递给GAE中的Controller

0 个答案: