在Java更新后的Eclipse中的FileNotFoundException

Question

我有一个程序，客户端上传文件并将文件存储在数据库中。在我的电脑上更新Java之前，我的项目工作正常。现在我得到FileNotFoundException。 Eclipse告诉我：

JAR文件C：\ Program Files \ Java \ jre7 \ lib \ rt.jar没有源 附件。

有人遇到过这个问题吗？

我的用于上载文件servlet代码是标准：

if (!ServletFileUpload.isMultipartContent(request)) 
    {return;} 

try 
{ 
    List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request); 
    courseID = items.get(0).getString(); 
    homeworkID = items.get(1).getString(); 
    File storeFile = new File(items.get(2).getName()); 
    String fileName = storeFile.getName(); 
    String mimeType = new MimetypesFileTypeMap().getContentType(storeFile); //for putting file into database 
    putFileIntoDB(uName, courseID, homeworkID, fileName, mimeType, storeFile); 
}//try 
catch (Exception ex) 
{ 
    request.setAttribute("msg", "There was an error: " + ex.getMessage()); 
    request.getRequestDispatcher("/upload.jsp").forward(request, response); 
    } 

有误差在putFileIntoDB方法发现在该行中创建的FileInputStream当f是=新的FileInputStream（F）：

void putFileIntoDB(String username, String courseID, String homeworkID, String fileName, String mime, File f) throws SQLException, IOException 
{ 
    FileInputStream fis = null; 
    java.sql.PreparedStatement pstmt = null; 
    java.sql.Connection conn = null; 
    try { 
      conn = ConnectionManager.getConnection(); 
      conn.setAutoCommit(true); 

      fis = new FileInputStream(f); 

      pstmt = conn.prepareStatement("insert into files(username, courseID, assignmentID, fileName, mimeType, contents) values (?, ?, ?, ?, ?, ?)"); 
      pstmt.setString(1, username); 
      pstmt.setString(2, courseID); 
      pstmt.setString(3, homeworkID); 
      pstmt.setString(4, fileName); 
      pstmt.setString(5, mime); 
      pstmt.setAsciiStream(6, fis, (int) f.length()); 

      pstmt.executeUpdate(); 
      conn.commit(); 
     } 
    catch (Exception e) 
    { 
     System.err.println("Error: " + e.getMessage()); 
     e.printStackTrace(); 
    } 
    finally 
    { 
     pstmt.close(); 
     fis.close(); 
     conn.close(); 
    } 
} 

还有人遇到过这个问题吗？

Answer 1

请尝试以下步骤;

第1步 - 配置Eclilpse使用JDK而不是JRE。

Window->Preferences->Java->Installed JREs 
Click "Add", "Standard VM", "Next" 
For "JRE Home" click "Directory" 
Locate your JDK directory... 
Ex: C:\java\jdk1.6.0_24 
Click "Finish" 
Next check the JDK vs the JRE that is listed. 
Click "Ok" 

第2步 - 将项目配置为使用JDK，因为它是使用JRE作为“已安装的JRE”创建的。新项目应该可以。

Right click the project's name. 
Choose "Properties", "Java Build Path" 
Click the tab "Libraries". 
Click "Add Libraries", select "JRE System Library", Next 
Select the bottom item: Workspace default JRE (jdk1.x.x. etc....) 
(Notice that it is now a JDK and not the JRE!) 
Click "Finish" 
Now remove the JRE libarary so you only have the JDK library. 
ex: JRE System Library [JavaSE-1.6] 
Click "OK"