1. 通过getInputStream()取得上传文件。

001 /**
002  * To change this template, choose Tools | Templates
003  * and open the template in the editor.
004  */
005 package net.individuals.web.servlet;
006   
007 import java.io.DataInputStream;
008 import java.io.FileOutputStream;
009 import java.io.IOException;
010 import javax.servlet.ServletException;
011 import javax.servlet.annotation.WebServlet;
012 import javax.servlet.http.HttpServlet;
013 import javax.servlet.http.HttpServletRequest;
014 import javax.servlet.http.HttpServletResponse;
015   
016 /**
017  *
018  * @author Barudisshu
019  */
020 @WebServlet(name = "UploadServlet", urlPatterns = {"/UploadServlet"})
021 public class UploadServlet extends HttpServlet {
022   
023     /**
024      * Processes requests for both HTTP
025      * <code>GET</code> and
026      * <code>POST</code> methods.
027      *
028      * @param request servlet request
029      * @param response servlet response
030      * @throws ServletException if a servlet-specific error occurs
031      * @throws IOException if an I/O error occurs
032      */
033     protected void processRequest(HttpServletRequest request, HttpServletResponse response)
034             throws ServletException, IOException {
035         response.setContentType("text/html;charset=UTF-8");
036         //读取请求Body
037         byte[] body = readBody(request);
038         //取得所有Body内容的字符串表示
039         String textBody = new String(body, "ISO-8859-1");
040         //取得上传的文件名称
041         String fileName = getFileName(textBody);
042         //取得文件开始与结束位置
043         Position p = getFilePosition(request, textBody);
044         //输出至文件
045         writeTo(fileName, body, p);
046     }
047   
048     //构造类
049     class Position {
050   
051         int begin;
052         int end;
053   
054         public Position(int begin, int end) {
055             this.begin = begin;
056             this.end = end;
057         }
058     }
059   
060     private byte[] readBody(HttpServletRequest request) throws IOException {
061         //获取请求文本字节长度
062         int formDataLength = request.getContentLength();
063         //取得ServletInputStream输入流对象
064         DataInputStream dataStream = new DataInputStream(request.getInputStream());
065         byte body[] = new byte[formDataLength];
066         int totalBytes = 0;
067         while (totalBytes < formDataLength) {
068             int bytes = dataStream.read(body, totalBytes, formDataLength);
069             totalBytes += bytes;
070         }
071         return body;
072     }
073   
074     private Position getFilePosition(HttpServletRequest request, String textBody) throws IOException {
075         //取得文件区段边界信息
076         String contentType = request.getContentType();
077         String boundaryText = contentType.substring(contentType.lastIndexOf("=") + 1, contentType.length());
078         //取得实际上传文件的气势与结束位置
079         int pos = textBody.indexOf("filename=\"");
080         pos = textBody.indexOf("\n", pos) + 1;
081         pos = textBody.indexOf("\n", pos) + 1;
082         pos = textBody.indexOf("\n", pos) + 1;
083         int boundaryLoc = textBody.indexOf(boundaryText, pos) - 4;
084         int begin = ((textBody.substring(0, pos)).getBytes("ISO-8859-1")).length;
085         int end = ((textBody.substring(0, boundaryLoc)).getBytes("ISO-8859-1")).length;
086   
087         return new Position(begin, end);
088     }
089   
090     private String getFileName(String requestBody) {
091         String fileName = requestBody.substring(requestBody.indexOf("filename=\"") + 10);
092         fileName = fileName.substring(0, fileName.indexOf("\n"));
093         fileName = fileName.substring(fileName.indexOf("\n") + 1, fileName.indexOf("\""));
094   
095         return fileName;
096     }
097   
098     private void writeTo(String fileName, byte[] body, Position p) throws IOException {
099         FileOutputStream fileOutputStream = new FileOutputStream("e:/workspace/" + fileName);
100         fileOutputStream.write(body, p.begin, (p.end - p.begin));
101         fileOutputStream.flush();
102         fileOutputStream.close();
103     }
104   
105     // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
106     /**
107      * Handles the HTTP
108      * <code>GET</code> method.
109      *
110      * @param request servlet request
111      * @param response servlet response
112      * @throws ServletException if a servlet-specific error occurs
113      * @throws IOException if an I/O error occurs
114      */
115     @Override
116     protected void doGet(HttpServletRequest request, HttpServletResponse response)
117             throws ServletException, IOException {
118         processRequest(request, response);
119     }
120   
121     /**
122      * Handles the HTTP
123      * <code>POST</code> method.
124      *
125      * @param request servlet request
126      * @param response servlet response
127      * @throws ServletException if a servlet-specific error occurs
128      * @throws IOException if an I/O error occurs
129      */
130     @Override
131     protected void doPost(HttpServletRequest request, HttpServletResponse response)
132             throws ServletException, IOException {
133         processRequest(request, response);
134     }
135   
136     /**
137      * Returns a short description of the servlet.
138      *
139      * @return a String containing servlet description
140      */
141     @Override
142     public String getServletInfo() {
143         return "Short description";
144     }// </editor-fold>
145 }

2. 通过getPart()、getParts()取得上传文件。

001 /**
002  * To change this template, choose Tools | Templates
003  * and open the template in the editor.
004  */
005 package net.individuals.web.servlet;
006   
007 import java.io.FileNotFoundException;
008 import java.io.FileOutputStream;
009 import java.io.IOException;
010 import java.io.InputStream;
011 import java.io.OutputStream;
012 import javax.servlet.ServletException;
013 import javax.servlet.annotation.MultipartConfig;
014 import javax.servlet.annotation.WebServlet;
015 import javax.servlet.http.HttpServlet;
016 import javax.servlet.http.HttpServletRequest;
017 import javax.servlet.http.HttpServletResponse;
018 import javax.servlet.http.Part;
019   
020 /**
021  *
022  * @author Barudisshu
023  */
024 @MultipartConfig
025 @WebServlet(name = "UploadServlet", urlPatterns = {"/UploadServlet"})
026 public class UploadServlet extends HttpServlet {
027   
028     /**
029      * Processes requests for both HTTP
030      * <code>GET</code> and
031      * <code>POST</code> methods.
032      *
033      * @param request servlet request
034      * @param response servlet response
035      * @throws ServletException if a servlet-specific error occurs
036      * @throws IOException if an I/O error occurs
037      */
038     protected void processRequest(HttpServletRequest request, HttpServletResponse response)
039             throws ServletException, IOException {
040         Part part = request.getPart("photo");
041         String fileName = getFileName(part);
042         writeTo(fileName, part);
043     }
044   
045     //取得上传文件名
046     private String getFileName(Part part) {
047         String header = part.getHeader("Content-Disposition");
048         String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));
049   
050         return fileName;
051     }
052   
053     //存储文件
054     private void writeTo(String fileName, Part part) throws IOException, FileNotFoundException {
055         InputStream in = part.getInputStream();
056         OutputStream out = new FileOutputStream("e:/workspace/" + fileName);
057         byte[] buffer = new byte[1024];
058         int length = -1;
059         while ((length = in.read(buffer)) != -1) {
060             out.write(buffer, 0, length);
061         }
062   
063         in.close();
064         out.close();
065     }
066   
067     // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
068     /**
069      * Handles the HTTP
070      * <code>GET</code> method.
071      *
072      * @param request servlet request
073      * @param response servlet response
074      * @throws ServletException if a servlet-specific error occurs
075      * @throws IOException if an I/O error occurs
076      */
077     @Override
078     protected void doGet(HttpServletRequest request, HttpServletResponse response)
079             throws ServletException, IOException {
080         processRequest(request, response);
081     }
082   
083     /**
084      * Handles the HTTP
085      * <code>POST</code> method.
086      *
087      * @param request servlet request
088      * @param response servlet response
089      * @throws ServletException if a servlet-specific error occurs
090      * @throws IOException if an I/O error occurs
091      */
092     @Override
093     protected void doPost(HttpServletRequest request, HttpServletResponse response)
094             throws ServletException, IOException {
095         processRequest(request, response);
096     }
097   
098     /**
099      * Returns a short description of the servlet.
100      *
101      * @return a String containing servlet description
102      */
103     @Override
104     public String getServletInfo() {
105         return "Short description";
106     }// </editor-fold>
107 }

另一种较为简单的方法：

01 /**
02  * To change this template, choose Tools | Templates
03  * and open the template in the editor.
04  */
05 package net.individuals.web.servlet;
06   
07 import java.io.IOException;
08 import java.io.PrintWriter;
09 import javax.servlet.ServletException;
10 import javax.servlet.annotation.MultipartConfig;
11 import javax.servlet.annotation.WebServlet;
12 import javax.servlet.http.HttpServlet;
13 import javax.servlet.http.HttpServletRequest;
14 import javax.servlet.http.HttpServletResponse;
15 import javax.servlet.http.Part;
16   
17 /**
18  *采用part的wirte(String fileName)上传，浏览器将产生临时TMP文件。
19  * @author Barudisshu
20  */
21 @MultipartConfig(location = "e:/workspace")
22 @WebServlet(name = "UploadServlet", urlPatterns = {"/UploadServlet"})
23 public class UploadServlet extends HttpServlet {
24   
25     /**
26      * Processes requests for both HTTP
27      * <code>GET</code> and
28      * <code>POST</code> methods.
29      *
30      * @param request servlet request
31      * @param response servlet response
32      * @throws ServletException if a servlet-specific error occurs
33      * @throws IOException if an I/O error occurs
34      */
35     protected void processRequest(HttpServletRequest request, HttpServletResponse response)
36             throws ServletException, IOException {
37         //处理中文文件名
38         request.setCharacterEncoding("UTF-8");
39         Part part = request.getPart("photo");
40         String fileName = getFileName(part);
41         //将文件写入location指定的目录
42         part.write(fileName);
43     }
44   
45     private String getFileName(Part part) {
46         String header = part.getHeader("Content-Disposition");
47         String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));
48         return fileName;
49     }
50   
51     // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
52     /**
53      * Handles the HTTP
54      * <code>GET</code> method.
55      *
56      * @param request servlet request
57      * @param response servlet response
58      * @throws ServletException if a servlet-specific error occurs
59      * @throws IOException if an I/O error occurs
60      */
61     @Override
62     protected void doGet(HttpServletRequest request, HttpServletResponse response)
63             throws ServletException, IOException {
64         processRequest(request, response);
65     }
66   
67     /**
68      * Handles the HTTP
69      * <code>POST</code> method.
70      *
71      * @param request servlet request
72      * @param response servlet response
73      * @throws ServletException if a servlet-specific error occurs
74      * @throws IOException if an I/O error occurs
75      */
76     @Override
77     protected void doPost(HttpServletRequest request, HttpServletResponse response)
78             throws ServletException, IOException {
79         processRequest(request, response);
80     }
81   
82     /**
83      * Returns a short description of the servlet.
84      *
85      * @return a String containing servlet description
86      */
87     @Override
88     public String getServletInfo() {
89         return "Short description";
90     }// </editor-fold>
91 }

使用getParts()上传多个文件：

01 <!--
02 To change this template, choose Tools | Templates
03 and open the template in the editor.
04 -->
05 <!DOCTYPE html>
06 <html>
07     <head>
08         <title></title>
09         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
10     </head>
11     <body>
12         <div>
13             <form action="UploadServlet3" method="POST" enctype="multipart/form-data">
14                 <table>
15                     <tr>
16                         <td><label for="file1">文件1：</label></td>
17                         <td><input type="file" id="file1" name="file"></td>
18                     </tr>
19                     <tr>
20                         <td><label for="file2">文件2：</label></td>
21                         <td><input type="file" id="file2" name="file"></td>
22                     </tr>
23                     <tr>
24                         <td><label for="file3">文件3：</label></td>
25                         <td><input type="file" id="file3" name="file"></td>
26                     </tr>
27                     <tr>
28                         <td colspan="2"><input type="submit" value="上传" name="upload"></td>
29                     </tr>
30                 </table>
31             </form>
32         </div>
33     </body>
34 </html>
 

对应Servlet代码：

01 /**
02  * To change this template, choose Tools | Templates
03  * and open the template in the editor.
04  */
05 package net.individuals.web.servlet;
06   
07 import java.io.IOException;
08 import java.io.PrintWriter;
09 import javax.servlet.ServletException;
10 import javax.servlet.annotation.MultipartConfig;
11 import javax.servlet.annotation.WebServlet;
12 import javax.servlet.http.HttpServlet;
13 import javax.servlet.http.HttpServletRequest;
14 import javax.servlet.http.HttpServletResponse;
15 import javax.servlet.http.Part;
16   
17 /**
18  *
19  * @author Barudisshu
20  */
21 @MultipartConfig(location = "e:/workspace")
22 @WebServlet(name = "UploadServlet", urlPatterns = {"/UploadServlet"})
23 public class UploadServlet extends HttpServlet {
24   
25     /**
26      * Processes requests for both HTTP
27      * <code>GET</code> and
28      * <code>POST</code> methods.
29      *
30      * @param request servlet request
31      * @param response servlet response
32      * @throws ServletException if a servlet-specific error occurs
33      * @throws IOException if an I/O error occurs
34      */
35     protected void processRequest(HttpServletRequest request, HttpServletResponse response)
36             throws ServletException, IOException {
37         request.setCharacterEncoding("utf-8");
38         //迭代Collection中所有Part对象
39         for (Part part : request.getParts()) {
40             //只处理上传文件区段
41             if (part.getName().startsWith("file")) {
42                 String fileName = getFileName(part);
43                 part.write(fileName);
44             }
45         }
46     }
47   
48     private String getFileName(Part part) {
49         String header = part.getHeader("Content-Disposition");
50         String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));
51         header.lastIndexOf("\"");
52         return fileName;
53     }
54   
55     // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
56     /**
57      * Handles the HTTP
58      * <code>GET</code> method.
59      *
60      * @param request servlet request
61      * @param response servlet response
62      * @throws ServletException if a servlet-specific error occurs
63      * @throws IOException if an I/O error occurs
64      */
65     @Override
66     protected void doGet(HttpServletRequest request, HttpServletResponse response)
67             throws ServletException, IOException {
68         processRequest(request, response);
69     }
70   
71     /**
72      * Handles the HTTP
73      * <code>POST</code> method.
74      *
75      * @param request servlet request
76      * @param response servlet response
77      * @throws ServletException if a servlet-specific error occurs
78      * @throws IOException if an I/O error occurs
79      */
80     @Override
81     protected void doPost(HttpServletRequest request, HttpServletResponse response)
82             throws ServletException, IOException {
83         processRequest(request, response);
84     }
85   
86     /**
87      * Returns a short description of the servlet.
88      *
89      * @return a String containing servlet description
90      */
91     @Override
92     public String getServletInfo() {
93         return "Short description";
94     }// </editor-fold>
95 }

Servlet多文件上传方法的更多相关文章

  1. Servlet实现文件上传

    一.Servlet实现文件上传,需要添加第三方提供的jar包 下载地址: 1) commons-fileupload-1.2.2-bin.zip      :   点击打开链接 2) commons- ...

  2. java常见3种文件上传速度对比和文件上传方法详细代码

    在java里面文件上传的方式很多,最简单的依然是FileInputStream.FileOutputStream了,在这里我列举3种常见的文件上传方法代码,并比较他们的上传速度(由于代码是在本地测试, ...

  3. Servlet实现文件上传，可多文件上传

    一.Servlet实现文件上传,需要添加第三方提供的jar包 接着把这两个jar包放到 lib文件夹下: 二: 文件上传的表单提交方式必须是POST方式, 编码类型:enctype="mul ...

  4. 配置servlet支持文件上传

    Servlet3.0为Servlet添加了multipart配置选项,并为HttpServletRequest添加了getPart和getParts方法获取上传文件.为了使Servlet支付文件上传需 ...

  5. jsp+servlet实现文件上传下载

    相关素材下载 01.jsp <%@ page language="java" contentType="text/html; charset=UTF-8" ...

  6. java commons-fileupload servlet 多文件上传

    commons-fileupload servlet 多文件上传 需要引入的 jar 包. commons-fileupload-1.3.2.jar commons-io-2.2.jar 工程路劲:查 ...

  7. Servlet之文件上传

    上传表单中的注意事项: 表单 method 属性应该设置为 POST 方法,不能使用 GET 方法 表单 enctype 属性应该设置为multipart/form-data 下面的实例是借助于com ...

  8. 使用FileUpload实现Servlet的文件上传

    简介 FileUpload 是 Apache commons下面的一个子项目,用来实现Java环境下的文件上传功能. FileUpload链接 FileUpload 是基于Apache的Commons ...

  9. servlet实现文件上传，预览，下载和删除

      一.准备工作 1.1 文件上传插件:uploadify: 1.2 文件上传所需jar包:commons-fileupload-1.3.1.jar和commons-io-2.2.jar 1.3 将数 ...

随机推荐

  1. 团队项目（第三周）—GG队

    需求改进&系统设计 队员 学号 叶尚文(队长) 3116008802 蔡晓晴 3216008808 杜婷萱 3216008809 龙剑初 3116004647 于泽浩 3116004661 一 ...

  2. Delphi for iOS开发指南(1):在Mac上配置你的开发环境

    http://cache.baiducontent.com/c?m=9d78d513d99516f11ab7cf690d678c3b584380122ba7a0020fd18438e4732b4050 ...

  3. Android 了解1G 2G 3G 知识

    了解1G 2G 3G 相关知识,对网络通讯制式进行了解即可 1.这种网络通讯制式是一步一步发展起来的,由最开始的1G(最典型的手机,例如:大哥大,1G这种制式只能语音通话). 2.后来出现的2G,2G ...

  4. ASP.NET MVC 使 Controller 的 Action 只接受 Ajax 请求。

    首先,ajax 请求跟一般的 web 请求本质是相同的,都是 http 请求.理论上服务器端是无法区分该次请求是不是 ajax 请求的,但是,既然标题都已经说了,那么肯定是有办法做的. 在 ajax ...

  5. Redis 慢查询

    Redis 慢查询   许多存储系统提供慢查询日志帮助开发和运维人员定位系统的慢操作.慢查询日志就是系统在命令执行前后计算每条命令的执行时间,当超过预设阈值就将这条命令的相关信息记录下来Redis提供 ...

  6. C#实现FTP文件的上传、下载功能、新建目录以及文件的删除

    本来这篇博文应该在上周就完成的,可无奈,最近工作比较忙,没有时间写,所以推迟到了今天.可悲的是,今天也没有太多的时间,所以决定给大家贴出源码,不做详细的分析说明,如果有不懂的,可以给我留言,我们共同讨 ...

  7. 机器学习、深度学习、和AI算法可以在网络安全中做什么？

    本文由  网易云发布. 本文作者:Alexander Polyakov,ERPScan的首席技术官和联合创始人.EAS-SEC总裁,SAP网络安全传播者. 现在已经出现了相当多的文章涉及机器学习及其保 ...

  8. 点分治&&动态点分治学习笔记

    突然发现网上关于点分和动态点分的教程好像很少……蒟蒻开篇blog记录一下吧……因为这是个大傻逼,可能有很多地方写错,欢迎在下面提出 参考文献:https://www.cnblogs.com/LadyL ...

  9. 详解PhpSpreadsheet设置单元格

    PhpSpreadsheet提供了丰富的API接口,可以设置诸多单元格以及文档属性,包括样式.图片.日期.函数等等诸多应用,总之你想要什么样的Excel表格,PhpSpreadsheet都能做到. 在 ...

  10. FunDA（11）－ 数据库操作的并行运算：Parallel data processing

    FunDA最重要的设计目标之一就是能够实现数据库操作的并行运算.我们先重温一下fs2是如何实现并行运算的.我们用interleave.merge.either这几种方式来同时处理两个Stream里的元 ...