不是目录：multipartrequest错误

Question

我正在使用eclipse galelio和apache tomcat server 5.5

jsp页面代码：

 <form action="Add" method=post enctype="multipart/form-data">
        <p>Book name:  <input type="text" name="bname" required/></p>
        <p>Price:<input type="text" name="bprice" required/></p>
        <p>Quantity:<input type="text" name="bqty" required/></p>
        <p>Image: <input type="file" name="file" required/></p>
        <p>Course: <select name="course">
        <option>course 1</option>
        <option>course 2</option> <!-- Some more options-->
        <input type="submit" value="Add" name="Submit"/></p>
    </form>

servlet代码：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

response.setContentType("text/html");
    PrintWriter out=response.getWriter();

    String path="images/default";
    MultipartRequest m=new MultipartRequest(request,path);
    String cy="";// i am assigng the value to cy based on some if else conditions on the value of course field
    String bname=m.getParameter("bname");
    String bprice=m.getParameter("bprice");
    String bqty=m.getParameter("bqty");
    String course=m.getParameter("course");
    String file=m.getFilesystemName("file");
try
    {
        Class.forName("com.mysql.jdbc.Driver");
        Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/pro","root","root");


        PreparedStatement ps=con.prepareStatement("select * from  product where bname=? and course=?");
        ps.setString(1,bname);  
        ps.setString(2,course); 
        ResultSet rs=ps.executeQuery();

        if(rs.next())
        {
            out.print("<p style='position:absolute;top:130px;left:360px;color:#CC0066'>Product already exists! You might want to <b>update</b>.</p>");
        }
        else
        {
            ps=con.prepareStatement("insert into product(bname,cy,course,price,qty,path,type) values (?,?,?,?,?,?,'n')");
            ps.setString(1,bname);  
            ps.setString(2,cy); 
            ps.setString(3,course);
            ps.setString(4,bprice); 
            ps.setString(5,bqty);   
            ps.setString(6,path+"/"+file);

            ps.executeUpdate();
            out.print("<p style='position:absolute;top:160px;left:550px;color:#CC0066'>Product added!</p>");

        }
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }
    RequestDispatcher rd=request.getRequestDispatcher("admin.jsp");
    rd.include(request, response);

}

我收到此错误：

java.lang.IllegalArgumentException: Not a directory: images/default

我肯定在eclipse中的项目的webcontent文件夹中有目录。 它应该工作正常，但不是。问题出在哪里？         我导入了：import com.oreilly.servlet.MultipartRequest;并在我的lib中有cos.jar文件 看附图。

Answer 1

正如您在类中的src代码中所看到的，路径必须存在并且必须是目录。所以我想目的地images/default不存在。

  /**
   * Constructs a new MultipartRequest to handle the specified request,
   * saving any uploaded files to the given directory, and limiting the
   * upload size to the specified length.  If the content is too large, an
   * IOException is thrown.  This constructor actually parses the
   * <tt>multipart/form-data</tt> and throws an IOException if there's any
   * problem reading or parsing the request.
   * <p/>
   * To avoid file collisions, this constructor takes an implementation of the
   * FileRenamePolicy interface to allow a pluggable rename policy.
   *
   * @param request       the servlet request.
   * @param saveDirectory the directory in which to save any uploaded files.
   * @param maxPostSize   the maximum size of the POST content.
   * @param encoding      the encoding of the response, such as ISO-8859-1
   * @param policy        a pluggable file rename policy
   * @throws IOException if the uploaded content is larger than
   *                     <tt>maxPostSize</tt> or there's a problem reading or parsing the request.
   */
  public MultipartRequest(HttpServletRequest request,
                          String saveDirectory,
                          int maxPostSize,
                          String encoding,
                          FileRenamePolicy policy) throws IOException {
    // Sanity check values
    if (request == null)
      throw new IllegalArgumentException("request cannot be null");
    if (saveDirectory == null)
      throw new IllegalArgumentException("saveDirectory cannot be null");
    if (maxPostSize <= 0) {
      throw new IllegalArgumentException("maxPostSize must be positive");
    }

    // Save the dir
    File dir = new File(saveDirectory);

    // Check saveDirectory is truly a directory
    if (!dir.isDirectory())
      throw new IllegalArgumentException("Not a directory: " + saveDirectory);