commos-fileupload文件上传

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文件上传页面

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<html>
	<head>
		<title>using commons Upload to upload file</title>
	</head>
	<style>
* {
	font-family: "宋体";
	font-size: 14px
}
</style>
	<body>
		<p align="center">
			请您选择需要上传的文件
		</p>
		<form id="form1" name="form1" method="post"
			action="<%=request.getContextPath()%>/servlet/uploadFile"
			enctype="multipart/form-data">
			<table border="0" align="center">
				<tr>
					<td>
						上传人：
					</td>
					<td>
						<input name="name" type="text" id="name" size="20">
					</td>
				</tr>
				<tr>
					<td>
						上传文件：
					</td>
					<td>
						<input name="file1" 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>

servlet

package com.v512.upload;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadServlet extends HttpServlet {
	/**
	 * 文件上传的servlet
	 */
	private static final long serialVersionUID = 1L;

	private String savePath;
	ServletContext sc;

	public void init(ServletConfig config) {
		savePath = config.getInitParameter("savePath");
		sc = config.getServletContext();
	}

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

	@SuppressWarnings("unchecked")
	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 = (List) upload.parseRequest(request);//解析表单传递过来的信息
			Iterator it = items.iterator();//迭代这些信息
			while (it.hasNext()) {
				FileItem item = (FileItem) it.next();
				if (item.isFormField()) {
					System.out.println("表单参数名：" + item.getFieldName()
							+ ",表单参数值：" + item.getString("UTF-8"));
				} else {
					System.out.println("上传文件的大小：" + item.getSize());
					System.out.println("上传文件的类型：" + item.getContentType());
					//下面这行代码是获取上传文件在客户端完整的路径
					System.out.println("上传文件的名称：" + item.getName());
					File tempFile = new File(item.getName());
					// sc.getRealPat("/")获取项目(根目录)在web服务器中的路径
					File file = new File(sc.getRealPath("/") + savePath,
							tempFile.getName());
					item.write(file);
					request.setAttribute("upload.message", "上传文件成功！");
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
			request.setAttribute("upload.message", "上传文件失败！");
		}
		request.getRequestDispatcher("/uploadResult.jsp").forward(request,
				response);
	}

}

返回页面

<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<html>
<head>
<title>upload result page</title>
</head>
<style>
* {	font-family: "宋体"; font-size: 14px }
</style>
<body>
<center>
<p>	${requestScope['upload.message'] }</p>
</body>
</html>

web.xml

<?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>
    <servlet-name>UploadServlet</servlet-name>
    <servlet-class>com.v512.upload.UploadServlet</servlet-class>
    <init-param>
    <param-name>savePath</param-name>
    <param-value>luowei</param-value>
    </init-param>
  </servlet>


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

依赖的jar包

example2

//使用FileUpload和io实现文件的上传。
public class UploadServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	@SuppressWarnings( { "deprecation", "unchecked" })
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		// 防止乱码
		request.setCharacterEncoding("UTF-8");

		// 文件上传的出发点
		DiskFileItemFactory factory = new DiskFileItemFactory();

		String path = request.getRealPath("/upload");// 获取发布以后的指定路径。

		factory.setRepository(new File(path));// 超过指定的大小就临时存放在硬盘(指定目录)中。

		factory.setSizeThreshold(1024 * 1024);// 如果上传文件不超过10k就存放在内存中。

		// 真正用来处理上传文件的。
		ServletFileUpload upload = new ServletFileUpload(factory);

		try {
			// 非常复杂的一个方法，真正完成上传的处理。
			List<FileItem> items = upload.parseRequest(request);

			for (FileItem item : items) {
				// 判断是否是file类型与非file类型的方法。
				if (item.isFormField()) {
					String fieldName = item.getFieldName();
					String fieldContent = item.getString("UTF-8");// 防止乱码
					request.setAttribute(fieldName, fieldContent);
				} else {
					String fieldName = item.getFieldName();

					// 当FileItem是一个file的时候可以使用getName()方法去获取上传文件的路径。
					String filePath = item.getName();

					// 获取文件的名称(符合所有浏览器)，有些浏览器会直接获取文件的名称，有些会获取路径。
					int i = filePath.lastIndexOf("\\");
					String fileName = filePath.substring(i + 1);
					request.setAttribute(fieldName, fileName);

					// InputStream is = item.getInputStream();
					// byte[] b = new byte[1024];
					// int bs = 0;
					// OutputStream os = new FileOutputStream(path + "/" +
					// fileName);
					// while ((bs = is.read(b)) > 0) {
					// os.write(b, 0, bs);
					// }
					// is.close();
					// os.close();

					// write()操作更方便(可以完全替代上面注意的操作)
					item.write(new File(path + "/" + fileName));
				}
			}
		} catch (FileUploadException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}

		// 跳转到指定的页面
		request.getRequestDispatcher("/upload/result2.jsp").forward(request,
				response);

	}

}

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