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Java實(shí)現(xiàn)文件上傳至服務(wù)器的方法

更新時(shí)間：2021年07月04日 11:04:31 作者：cj634118150

這篇文章主要為大家詳細(xì)介紹了Java實(shí)現(xiàn)文件上傳至服務(wù)器的方法，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

在我們的web開發(fā)中，很多的時(shí)候都需要把本機(jī)的一些文件上傳到web服務(wù)器上面去。

如：一個(gè)BBS系統(tǒng)，當(dāng)用戶使用這是系統(tǒng)的時(shí)候，能把本機(jī)的一些圖片，文檔上傳到服務(wù)器上面去。然后其他用戶可以去下載這些文件，那么這樣的話，我們可以自己編程實(shí)現(xiàn)文件的上傳

但是更好的方式是使用一些已有的組件幫助我們實(shí)現(xiàn)這種上傳功能。

常用的上傳組件：　　

Apache 的 Commons FileUpload

JavaZoom的UploadBean

jspSmartUpload

upload.jsp

代碼；

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<html>
<head>
<title>using commons Upload to upload file </title>
</head>
<style>
* { font-family: "宋體"; font-size: 14px }
</style>
<body>
<p align="center"> 請您選擇需要上傳的文件</p>
<form id="form1" name="form1" method="post" action="servlet/fileServlet" enctype="multipart/form-data">
 <table border="0" align="center">
 <tr>
 <td>上傳人：</td>
 <td>
 <input name="name" type="text" id="name" size="20" ></td>
 </tr> 
 <tr>
 <td>上傳文件：</td>
 <td><input name="file" type="file" size="20" ></td>
 </tr> 
 <tr> 
 <td></td><td>
 <input type="submit" name="submit" value="提交" >
 <input type="reset" name="reset" value="重置" >
 </td>
 </tr>
 </table>
</form>
</body>
</html>

FileUploadServlet.java代碼：

/**
 * 
 */
package com.b510.example;

import java.io.File;
import java.io.IOException;
import java.util.*;


import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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;

/**
 * 
 * @author XHW
 * 
 * @date 2011-7-26
 * 
 */
public class FileUploadServlet extends HttpServlet {

 private static final long serialVersionUID = -7744625344830285257L;
 private ServletContext sc;
 private String savePath;

 public void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 doPost(request, response);
 }
 

 public void init(ServletConfig config) {
 // 在web.xml中設(shè)置的一個(gè)初始化參數(shù)
 savePath = config.getInitParameter("savePath");
 sc = config.getServletContext();
 }
 
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 request.setCharacterEncoding("UTF-8");
 DiskFileItemFactory factory = new DiskFileItemFactory();
 ServletFileUpload upload = new ServletFileUpload(factory);
 try {
 List items = upload.parseRequest(request);
 Iterator itr = items.iterator();
 while (itr.hasNext()) {
 FileItem item = (FileItem) itr.next();
 if (item.isFormField()) {
  System.out.println("表單參數(shù)名:" + item.getFieldName() + "，表單參數(shù)值:" + item.getString("UTF-8"));
 } else {
  if (item.getName() != null && !item.getName().equals("")) {
  System.out.println("上傳文件的大小:" + item.getSize());
  System.out.println("上傳文件的類型:" + item.getContentType());
  // item.getName()返回上傳文件在客戶端的完整路徑名稱
  System.out.println("上傳文件的名稱:" + item.getName());

  File tempFile = new File(item.getName());

　?。蟼魑募谋４媛窂?
  File file = new File(sc.getRealPath("/") + savePath, tempFile.getName());
  item.write(file);
  request.setAttribute("upload.message", "上傳文件成功！");
  }else{
  request.setAttribute("upload.message", "沒有選擇上傳文件！");
  }
 }
 }
 }catch(FileUploadException e){
 e.printStackTrace();
 } catch (Exception e) {
 e.printStackTrace();
 request.setAttribute("upload.message", "上傳文件失敗！");
 }
 request.getRequestDispatcher("/uploadResult.jsp").forward(request, response);
 }
}

uploadResult.jsp代碼：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
 
 <title>uploadResult</title>
 
 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0"> 
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" >
 -->

 </head>
 
 <body>
 ${requestScope['upload.message'] }
 <a href="/upload/uploadFile.jsp" rel="external nofollow" >上傳文件</a>
 </body>
</html>

web.xml

<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>FileUploadServlet</servlet-name>
 <servlet-class>com.b510.example.FileUploadServlet</servlet-class>

　?。?！--設(shè)置初始化參數(shù)--＞
 <init-param>
  <param-name>savePath</param-name>
  <param-value>uploads</param-value>
 </init-param>
 </servlet>

 <servlet-mapping>
 <servlet-name>FileUploadServlet</servlet-name>
 <url-pattern>/servlet/fileServlet</url-pattern>
 </servlet-mapping>

本文已被整理到了《Java上傳操作技巧匯總》，歡迎大家學(xué)習(xí)閱讀。

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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