Servlet方法沒有被調用？

Question

我想上傳一個文件到網絡服務器，並閱讀相同。文件上傳工作和文件上傳，但是當我調用一些方法來操作保存的文件方法不會被調用。

在以下文件中，我從post方法調用readFile方法。

我正在使用tomcat 7.0。請救我吧。代碼是：

package org.slingemp.fileupload; 

import java.io.IOException; 
import javax.servlet.ServletException; 
import javax.servlet.annotation.WebServlet; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

import org.slingemp.bean.setNotification; 
import java.io.File; 
import java.io.IOException; 
import java.io.PrintWriter; 
import java.util.Iterator; 
import java.util.List; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import javax.servlet.http.HttpSession; 
import org.apache.commons.fileupload.FileItem; 
import org.apache.commons.fileupload.FileUploadException; 
import org.apache.commons.fileupload.disk.DiskFileItemFactory; 
import org.apache.commons.fileupload.servlet.ServletFileUpload; 
import org.apache.commons.io.FilenameUtils; 

import org.apache.poi.hssf.usermodel.HSSFWorkbook; 
import org.apache.poi.hssf.usermodel.HSSFSheet; 
import org.apache.poi.hssf.usermodel.HSSFRow; 
import org.apache.poi.hssf.usermodel.HSSFCell; 

import java.io.FileInputStream; 
import java.io.IOException; 
import java.util.Iterator; 
import java.util.LinkedHashMap; 
import java.util.List; 
import java.util.ArrayList; 
import java.util.Map; 

/** 
* Servlet implementation class Fileupload 
*/ 
@WebServlet("/Fileupload") 
public class Fileupload extends HttpServlet { 
    private static final long serialVersionUID = 1L; 

    /** 
    * @see HttpServlet#HttpServlet() 
    */ 
    public Fileupload() { 
     super(); 
     // TODO Auto-generated constructor stub 
    } 

    /** 
    * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse 
    *  response) 
    */ 
    protected void doGet(HttpServletRequest request, 
      HttpServletResponse response) throws ServletException, IOException { 
     // TODO Auto-generated method stub 
    } 

    /** 
    * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse 
    *  response) 
    */ 
    protected void doPost(HttpServletRequest request, 
      HttpServletResponse response) throws ServletException, IOException { 
      System.out.println("file upload started....Antony"); 
     // TODO Auto-generated method stub 
     List fileItemsList = null; 
     float filesize = 0; 
     String _fileLink; 
     String _fileName = null; 
     String _uploadDir = getServletContext().getRealPath("/accesscarddata/"); 
     // Change upload with your directory 
     HttpSession session = request.getSession(true); 
     try { 
      if (ServletFileUpload.isMultipartContent(request)) { 
       ServletFileUpload servletFileUpload = new ServletFileUpload(
         new DiskFileItemFactory()); 
       try { 
        fileItemsList = servletFileUpload.parseRequest(request); 
       } catch (FileUploadException ex) { 
        Logger.getLogger(Fileupload.class.getName()).log(
          Level.SEVERE, null, ex); 
        // Change above line replace FileUploadExample with your 
        // file name 
       } 
       String optionalFileName = ""; 
       FileItem fileItem = null; 

       Iterator it = fileItemsList.iterator(); 
       while (it.hasNext()) { 
        FileItem fileItemTemp = (FileItem) it.next(); 
        if (fileItemTemp.isFormField()) { 
         if (fileItemTemp.getFieldName().equals("filename")) { 
          optionalFileName = fileItemTemp.getString(); 
         } 
         /* 
         * If you want to pass some other data from JSP page. 
         * You can access then in this way. For each field you 
         * have do create if like below. if 
         * (fileItemTemp.getFieldName 
         *().equals("Name of other field like:Firstname")) { 
         * String Firstname = fileItemTemp.getString(); } 
         */ 
        } else { 
         fileItem = fileItemTemp; 
        } 
       } 
       if (fileItem != null) { 
        long size_long = fileItem.getSize(); 
        filesize = size_long/1024; 
        filesize = filesize/1000; 
        // If you want to limit the file size. Here 30MB file size 
        // is allowed you can change it 
        //if (filesize > 30.0) { 
         // Pass error message in session. 
         //setNotification _sN = new setNotification(); 
         //_sN.setError("File size can't be more than 30MB"); 
         //session.setAttribute("error", _sN); 
        //} else { 
         _fileName = fileItem.getName(); 
         if (fileItem.getSize() > 0) { 
          if (optionalFileName.trim().equals("")) { 
           _fileName = FilenameUtils.getName(_fileName); 
          } else { 
           _fileName = optionalFileName; 
          } 
           _fileLink = "../accesscarddata/" + _fileName; 
          try { 
           File file = new File(new File(_uploadDir + "/"),fileItem.getName()); 
           fileItem.write(file); 
          } catch (Exception e) { 
           e.printStackTrace(); 
          } 
          setNotification _sN = new setNotification(); 
          _sN.setError("File Uploaded to : " + _fileLink + ""); 
          session.setAttribute("accesscardDatafileNname", _fileName); 
          session.setAttribute("error", _sN); 

         } 
        //} 
       } 
       //SELECT * FROM leave_application WHERE from_date >= '2004-01-01' AND to_date <'2004-01-30' and emp_id=128 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
     System.out.println("before calling readFile"); 
     readFile(request,response); 
     System.out.println("after calling readFile"); 

     response.sendRedirect("index.jsp"); 

    } 
    protected void readFile(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { 
     System.out.println("readFile is called.."); 
     Map employeeMap = null; 

     String fileName = "",employeeAttendanceFilePath=""; 
     String _uploadDir = getServletContext().getRealPath("/accesscarddata/"); 
     HttpSession session = request.getSession(true); 
     if(session.getAttribute("accesscardDatafileNname") != null) 
      fileName = (String) session.getAttribute("accesscardDatafileNname"); 

     employeeAttendanceFilePath = _uploadDir+fileName; 
     System.out.println("File Path : "+employeeAttendanceFilePath); 
     List sheetData = new ArrayList(); 
     FileInputStream fis = null; 
     try { 
      fis = new FileInputStream(employeeAttendanceFilePath); 
      // Create an excel workbook from the file system. 
      HSSFWorkbook workbook = new HSSFWorkbook(fis); 
      HSSFSheet sheet = workbook.getSheetAt(0);// gets the first sheet on workbook 
      Iterator rows = sheet.rowIterator(); 
      while (rows.hasNext()) { 
       HSSFRow row = (HSSFRow) rows.next(); 
       Iterator cells = row.cellIterator(); 
       //count=count+1; 
       List data = new ArrayList(); 
       while (cells.hasNext()) { 
        HSSFCell cell = (HSSFCell) cells.next(); 
        data.add(cell); 
       } 
       sheetData.add(data); 
      } 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } finally { 
      if (fis != null) { 
       fis.close(); 
      } 
     } 
     session.setAttribute("sheetData", sheetData); 
     processEmployeeAttendance(request,response); 
     System.out.println("employeeMap : "+employeeMap); 

     if(session.getAttribute("employeeMap")!=null) 
      employeeMap = (LinkedHashMap) session.getAttribute("sheetData"); 

     Iterator<Map.Entry> entries = employeeMap.entrySet().iterator(); 
     while (entries.hasNext()) { 
      Map.Entry entry = entries.next(); 
      System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue()); 
     } 
    } 
    protected void processEmployeeAttendance(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { 

     System.out.println("processEmployeeAttendance is called..."); 
     String tempEmpid="",strdepartment=""; 
     int j=1; 
     List sheetData =null; 
     HttpSession session = request.getSession(true); 
     if(session.getAttribute("sheetData")!=null) 
      sheetData = (ArrayList) session.getAttribute("sheetData"); 

     Map employeeMap = new LinkedHashMap(); 
     Map tempEmployeeMap = new LinkedHashMap(); 

     for (int i = 0; i < sheetData.size(); i++) { 
      List list = (List) sheetData.get(i); 
       HSSFCell employeeid = (HSSFCell) list.get(0); 
       HSSFCell department = (HSSFCell) list.get(3); 
       HSSFCell date = (HSSFCell) list.get(5); 

       strdepartment = department.getRichStringCellValue().getString(); 
       if(!tempEmpid.equals("")){ 
         if(tempEmpid.equals(employeeid.getRichStringCellValue().getString()) && !(employeeid.getRichStringCellValue().getString().equals("EmpID") || date.getRichStringCellValue().getString().equals("Date") || department.getRichStringCellValue().getString().equals("Department"))){ 
          if(!(strdepartment.equals("Temporary Card") || strdepartment.equals("Contractor"))){ 
           employeeMap.put(employeeid.getRichStringCellValue().getString()+"_"+j,date.getRichStringCellValue().getString()); 
          //  System.out.println("j value : "+j+":"+employeeid.getRichStringCellValue().getString()+"_"+j+","+date.getRichStringCellValue().getString()); 
            j++; 
          } 
         }else{ 
          tempEmpid = employeeid.getRichStringCellValue().getString(); 
          j=0; 
         } 
       }else{ 
        tempEmpid = employeeid.getRichStringCellValue().getString(); 
       } 
       // System.out.println(""); 
     } 
     session.setAttribute("employeeMap", employeeMap); 
    } 
} 

Answer 1

我想把它作爲評論，但不知何故，我無法發表評論。 我的建議是使用IDE調試代碼。在相關位置放置斷點並查看它的去向。