用jsp、Servlet實現上傳檔案_

用jsp、Servlet實現上傳檔案__js

最後更新：2018-07-26 來源：互聯網

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最近項目中遇到需要匯入excel檔案並將檔案中資料儲存到資料庫的問題，於是特意練習了一下檔案的上傳。

一、頁面upload.jsp檔案

<body>
<h2>匯入標準xml關係模式</h2>
<form name="upform" action="UploadServlet" method="POST" enctype="multipart/form-data">
     <input type ="file" name="file1" id="file1"/><br/>
         <input type ="file" name="file2" id="file2"/><br/>
           <input type ="file" name="file3" id="file3"/><br/>
              <input type="submit" value="Submit" /><br/>
               <input type="reset" />
      </form>
</body>

二、servlet檔案UploadServlet.java

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.DefaultFileItemFactory;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;

public class UploadServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
File tmpDir = null;//初始化上傳檔案的臨時存放目錄
File saveDir = null;//初始化上傳檔案後的儲存目錄
public UploadServlet() {      super();    }

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   doPost(request,response);
   }
public void init() throws ServletException {
   super.init();
   String tmpPath = "c:\\tmpdir";
   String savePath = "c:\\updir";
   tmpDir = new File(tmpPath);
   saveDir = new File(savePath);
   if(!tmpDir.isDirectory())
    tmpDir.mkdir();
   if(!saveDir.isDirectory())
    saveDir.mkdir();
   }

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
   try{
        if(ServletFileUpload.isMultipartContent(request)){
     DiskFileItemFactory dff = new DiskFileItemFactory();//建立該對象
     dff.setRepository(tmpDir);//指定上傳檔案的臨時目錄
     dff.setSizeThreshold(1024000);//指定在記憶體中快取資料大小,單位為byte
     ServletFileUpload sfu = new ServletFileUpload(dff);//建立該對象
     sfu.setFileSizeMax(5000000);//指定單個上傳檔案的最大尺寸
     sfu.setSizeMax(10000000);//指定一次上傳多個檔案的總尺寸
     FileItemIterator fii = sfu.getItemIterator(request);
     while(fii.hasNext()){

      FileItemStream fis = fii.next();//從集合中獲得一個檔案流
      if(!fis.isFormField() && fis.getName().length()>0){
       System.out.println("fff");
       String fileName = fis.getName().substring(fis.getName().lastIndexOf(\\)+1);//獲得上傳檔案的檔案名稱
       System.out.println(fileName);
       BufferedInputStream in = new BufferedInputStream(fis.openStream());//獲得檔案輸入資料流
       BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File(saveDir+"\"+filename)));//獲得檔案輸出資料流
       Streams.copy(in, out, true);//開始把檔案寫到你指定的上傳檔案夾
      }
     }
     response.getWriter().println("File upload successfully!!!");
    }
   }
   catch(Exception e){
    e.printStackTrace();
   }
}

}

三、web.xml檔案

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>UploadServlet</servlet-name>
    <servlet-class>UploadServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>UploadServlet</servlet-name>
    <url-pattern>/UploadServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>UploadServlet</servlet-name>
    <url-pattern>/UploadServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
    <welcome-file>upload.jsp</welcome-file>
</welcome-file-list>
</web-app>

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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