在jsp中使用多部分文件上傳文件

如何在jsp中使用多部分表單上傳文件。我曾嘗試上傳的文件是越來越上傳，但像文/下拉框的形式等各個領域，其價值不能被讀取在jsp中使用多部分文件上傳文件

2011-03-16 anonymous

更新

下面是與爲什麼沿着一個更好的答案是什麼你想不工作：How to upload files to server using JSP/Servlet?

必須，如果你與如Tomcat 6容器的工作（或任何地方的Servlet 3.0 S其中使用這樣的庫爲Apache Commons FileUpload或com.oreilly.servlet pec不支持）。

2011-03-16 04:40:24

存在對上傳按鈕一個條件...其依賴於輸入字段的以相同的形式的值.. .....如果有一個值大於2，那麼只有文件上傳應該被問到......我想在這裏納入ajax ......我會嘗試你提供的解決方案並回復給你。 – anonymous 2011-03-16 04:47:58

我確信下面的代碼工作正常，因爲經過很好的測試。

JSP文件：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" 
     pageEncoding="ISO-8859-1"%> 
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
    <html> 
    <head> 
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> 
    <title>Insert title here</title> 
    </head> 
    <body> 
    <form method="POST" action="UploadServlet" enctype="multipart/form-data" > 
       File: 
       <input type="file" name="file" id="file" /> <br/> 
       Destination: 
       <input type="text" name="foldername"/> 
       </br> 
       <input type="submit" value="Upload" name="upload" id="upload" /> 
      </form> 

    </body> 
    </html>

Servlet的文件：

package com.servicehandler; 

    import java.io.File; 
    import java.io.FileNotFoundException; 
    import java.io.FileOutputStream; 
    import java.io.IOException; 
    import java.io.InputStream; 
    import java.io.OutputStream; 
    import java.io.PrintWriter; 

    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 javax.servlet.annotation.MultipartConfig; 
    import javax.servlet.http.Part; 



    /** 
    * Servlet implementation class UploadServlet 
    */ 
    @WebServlet("/UploadServlet") 
    @MultipartConfig(fileSizeThreshold=1024*1024*2,//2mb 
        maxFileSize=1024*1024*10,//10mb 
        maxRequestSize=1024*1024*50)//50mb 
    public class UploadServlet extends HttpServlet { 
     private static final long serialVersionUID = 1L; 

     /** 
     * @see HttpServlet#HttpServlet() 
     */ 
     public UploadServlet() { 
      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 
      response.getWriter().append("Served at: ").append(request.getContextPath()); 
     } 

     /** 
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 
     */ 
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
     { 

      response.setContentType("text/html;charset=UTF-8"); 
      String subfoldername=request.getParameter("foldername"); 
      String realpath=getServletContext().getRealPath("/"); 

      uploadFileTolocaldirectory(subfoldername,request); 

      uploadFileToserverContextRealpath(subfoldername,realpath,request); 

      uploadFileToapplicationdirectory(subfoldername,request); 
     } 




     public static void uploadFileTolocaldirectory(String foldername,HttpServletRequest request) throws IllegalStateException, IOException, ServletException 
     { 

      String savePath="C:\\rootdir\\"+File.separator+foldername; 
      File fileSaveDir = new File(savePath); 
      if (!fileSaveDir.exists()) 
      { 
       fileSaveDir.mkdirs(); 
      } 

      Part part =request.getPart("file"); 
      String fileName = extractFileName(part); 
      part.write(savePath + File.separator + fileName); 
     } 

     public static void uploadFileToserverContextRealpath(String foldername,String realpath,HttpServletRequest request) throws IllegalStateException, IOException, ServletException 
     { 
      String savepath=realpath+File.separator+foldername; 
      File fileSaveDir = new File(savepath); 
      if (!fileSaveDir.exists()) 
      { 
       fileSaveDir.mkdirs(); 
      } 

      Part part =request.getPart("file"); 
      String fileName = extractFileName(part); 
      part.write(savepath + File.separator + fileName); 
     } 

     public void uploadFileToapplicationdirectory(String foldername,HttpServletRequest request) throws IllegalStateException, IOException, ServletException 
     { 

      String path="D:\\yeldiallproject\\Fileuploadusingservlet\\WebContent"; 
      String savepath=path+File.separator+foldername; 
      File fileSaveDir = new File(savepath); 
      if (!fileSaveDir.exists()) 
      { 
       fileSaveDir.mkdirs(); 
      } 

      Part part =request.getPart("file"); 
      String fileName = extractFileName(part); 
      part.write(savepath + File.separator + fileName); 
     } 


     private static String extractFileName(Part part) { 
      String partHeader = part.getHeader("content-disposition"); 
      for (String content : part.getHeader("content-disposition").split(";")) { 
       if (content.trim().startsWith("filename")) { 
        String filename = content.substring(content.indexOf('=') + 1).trim().replace("\"", ""); 
        return filename.substring(filename.lastIndexOf('/') + 1).substring(filename.lastIndexOf('\\') + 1); // MSIE fix. 
       } 
      } 
      return null; 
     } 

     }

來源

2016-07-07 12:31:08 kumaravel10

在jsp中使用多部分文件上傳文件

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