java.io.FileNotFoundException：（沒有這樣的文件或目錄） - 使用servlets

我正在使用hibernate和tomcat。我所做的是創建一個具有文件輸入的表單。在servlet中，我想將該文件轉換爲byte []。但是當我想創建de File時，沒有目錄：它只保存圖像的名稱，而不是路徑。以下是錯誤：java.io.FileNotFoundException：（沒有這樣的文件或目錄） - 使用servlets

java.io.FileNotFoundException: oldi.png (No such file or directory) at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.(FileInputStream.java:138) at control.servlets.AddGenericItem.doPost(AddGenericItem.java:46) at javax.servlet.http.HttpServlet.service(HttpServlet.java:647) at javax.servlet.http.HttpServlet.service(HttpServlet.java:728) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:724)

的HTML：

<tr> 
    <td> 
     <font class="text_title">Image: </font> 
    </td> 
    <td> 
     <input name="image" type="file"> 
    </td> 
</tr> 

<tr> 
    <td> 
     <input type="submit" value="submit" name="ctl00$MainContent$RegisterUserWizard$CreateUserStepContainer$CreateButton" 
       id="ctl00_MainContent_RegisterUserWizard_CreateUserStepContainer_CreateButton" 
       style="border-width:0px;"> 
    </td> 
</tr>

的Servlet：

public class AddGenericItem extends HttpServlet { 
    @Override 
    protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) 
      throws ServletException, IOException { 

//  HttpSession session = httpServletRequest.getSession(); 
     DatabaseManager databaseManager = new DatabaseManager(); 

     String name = httpServletRequest.getParameter("name"); 
     String description = httpServletRequest.getParameter("description"); 
     float price = Float.parseFloat(httpServletRequest.getParameter("price")); 

     File image = new File(httpServletRequest.getParameter("image")); 
     byte[] imageArray = new byte[(int) image.length()]; 
     try { 
      FileInputStream fileInputStream = new FileInputStream(image); 
      fileInputStream.read(imageArray); 
      fileInputStream.close(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     Admin admin = (Admin) httpServletRequest.getSession().getAttribute("user"); 
     Brand brand = admin.getBrand(); 

     GenericItem genericItem = new GenericItem(name, description, imageArray, price,brand); 

     GenericItemDAO genericItemDAO = databaseManager.getGenericItemDAO(); 

     genericItemDAO.beginTransaction(); 
     genericItemDAO.save(genericItem); 

     try { 
      genericItemDAO.commitTransaction(); 
     } catch (DatabaseAccessFailException e) { 
      e.getStackTrace(); 
     } finally { 
      httpServletResponse.sendRedirect("/adminPages/items.jsp"); 
     } 
    } 

    @Override 
    protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) 
      throws ServletException, IOException { 

    } 

    @Override 
    protected void doDelete(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) 
      throws ServletException, IOException { 

    } 

}

來源

2014-07-20 user3808750

哪裏是'oldi.png'項目中存在的？ – Braj

你想上傳圖片嗎？ – iMBMT

oldi.png在項目中不存在，我試圖從桌面上載它。 – user3808750

我希望你在文件上傳工作。

的問題是在下面一行：

FileInputStream fileInputStream = new FileInputStream(image);

servlet尋找的文件在服務器上讀取，但在那個時候它不會在那裏。

被Apache提供使用Commons Fileupload library，可以很容易強大的，高性能的，文件上傳功能添加到您的servlet和Web應用程序。

找到完整的代碼here和here和here

來源

2014-07-20 11:47:17 Braj

java.io.FileNotFoundException：（沒有這樣的文件或目錄） - 使用servlets

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