标签：
代码如下:
还要两个jar包
前台页面:
01 |
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> |
02 |
<% |
03 |
String path = request.getContextPath(); |
04 |
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; |
05 |
%> |
06 |
07 |
08 |
09 |
|
10 |
<base href="<%=basePath%>"> |
11 |
|
12 |
<title>My JSP ‘index.jsp‘ starting page</title> |
13 |
<meta http-equiv="pragma" content="no-cache"> |
14 |
<meta http-equiv="cache-control" content="no-cache"> |
15 |
<meta http-equiv="expires" content="0"> |
16 |
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> |
17 |
<meta http-equiv="description" content="This is my page"> |
18 |
<!-- |
19 |
<link rel="stylesheet" type="text/css" href="styles.css"> |
20 |
--> |
21 |
|
22 |
|
23 |
<!-- |
24 |
action:请求地址 |
25 |
method:请求方式 get post |
26 |
enctype:multipart/form-data 以二进制的形式向服务器传递参数 |
27 |
--> |
28 |
<form action="fileUp.do" method="post" enctype="multipart/form-data"> |
29 |
<table> |
30 |
<tbody><tr> |
31 |
<td>请选择要上传的文件:</td> |
32 |
<td><input type="file" name="file"></td> |
33 |
</tr> |
34 |
<tr> |
35 |
<td><input type="submit" value="开始上传"></td> |
36 |
</tr> |
37 |
</tbody></table> |
38 |
</form> |
39 |
|
01 |
package com.zengda; |
02 |
03 |
import java.io.File; |
04 |
import java.io.IOException; |
05 |
import java.io.PrintWriter; |
06 |
import java.util.Iterator; |
07 |
import java.util.List; |
08 |
09 |
import javax.servlet.http.HttpServlet; |
10 |
import javax.servlet.http.HttpServletRequest; |
11 |
import javax.servlet.http.HttpServletResponse; |
12 |
13 |
import org.apache.commons.fileupload.FileItem; |
14 |
import org.apache.commons.fileupload.FileUploadException; |
15 |
import org.apache.commons.fileupload.disk.DiskFileItemFactory; |
16 |
import org.apache.commons.fileupload.servlet.ServletFileUpload; |
17 |
18 |
public class FileUpServlet extends HttpServlet{ |
19 |
//重写HttpServlet里面的service方法 |
20 |
public void service(HttpServletRequest request,HttpServletResponse response) |
21 |
throws IOException{ |
22 |
request.setCharacterEncoding("UTF-8");//设置编码 |
23 |
response.setCharacterEncoding("GBK"); |
24 |
//基于磁盘文件项目创建一个工厂对象 |
25 |
DiskFileItemFactory factory = new DiskFileItemFactory(); |
26 |
//创建一个新的文件上传对象 |
27 |
ServletFileUpload upload = new ServletFileUpload(factory); |
28 |
try { |
29 |
//解析上传请求 |
30 |
List items = upload.parseRequest(request); |
31 |
Iterator itr = items.iterator();//枚举方法 返回迭代器 |
32 |
while (itr.hasNext()) {//如果迭代器有数据 返回true 没数据返回false |
33 |
FileItem fileItem = (FileItem)itr.next();//获取FileItem对象 |
34 |
if(!fileItem.isFormField()){//判断是否为文件上传域 如果是文件上传域返回false 不是就返回true |
35 |
long fileSize = fileItem.getSize();//获取文件的大小 |
36 |
String fileName = fileItem.getName();//获取上传文件的名字(真实文件) |
37 |
//构建一个临时对象,将文件暂时的保存在服务器的内存里面 |
38 |
File tempFile = new File(fileName); |
39 |
//根据servlet上下文获取上传路径 |
40 |
String updatePath = this.getServletContext().getRealPath("/upload"); |
41 |
//获取根目录对应的真实物理路径 |
42 |
File file = new File(updatePath,tempFile.getName()); |
43 |
//将文件上传 |
44 |
fileItem.write(file); |
45 |
PrintWriter out = response.getWriter();//获取输出流 |
46 |
out.print("文件上传成功! "); |
47 |
out.print("上传路径为: "+updatePath); |
48 |
out.print("文件名: "+fileName); |
49 |
out.print("文件的大小为: "+fileSize+" KB"); |
50 |
} |
51 |
} |
52 |
} catch (FileUploadException e) { |
53 |
e.printStackTrace(); |
54 |
} catch (Exception e) { |
55 |
e.printStackTrace(); |
56 |
} |
57 |
|
58 |
} |
59 |
} |
01 |
<!--?xml version="1.0" encoding="UTF-8"?--> |
02 |
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> |
03 |
<display-name>FileUp</display-name> |
04 |
<welcome-file-list> |
05 |
<welcome-file>index.html</welcome-file> |
06 |
<welcome-file>index.htm</welcome-file> |
07 |
<welcome-file>index.jsp</welcome-file> |
08 |
<welcome-file>default.html</welcome-file> |
09 |
<welcome-file>default.htm</welcome-file> |
10 |
<welcome-file>default.jsp</welcome-file> |
11 |
</welcome-file-list> |
12 |
|
13 |
<!-- 定义一个servlet --> |
14 |
<servlet> |
15 |
<servlet-name>file</servlet-name> |
16 |
<servlet-class>com.zengda.FileUpServlet</servlet-class> |
17 |
</servlet> |
18 |
|
19 |
<!-- 配置访问路径 --> |
20 |
<servlet-mapping> |
21 |
<servlet-name>file</servlet-name> |
22 |
<url-pattern>/fileUp.do</url-pattern> |
23 |
</servlet-mapping> |
24 |
</web-app> |
标签：
原文地址：http://www.cnblogs.com/zengda/p/4297779.html
