使用FileUpload上传文件

[jsp]代码库

package com.demo;

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

	@SuppressWarnings("unchecked")
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		System.out.println("--------------upload-----------");

		DiskFileItemFactory factory = new DiskFileItemFactory();
		factory.setSizeThreshold(1024 * 1024); // 设置缓存大小，单位KB
		String path = request.getRealPath("/upload"); // 得到当前项目upload目录的绝对路径
		factory.setRepository(new File(path)); // 设置文件临时存储路径为path
		ServletFileUpload upload = new ServletFileUpload(factory);
		try {
			List<FileItem> list = upload.parseRequest(request);
			for (FileItem item : list) {
				// 如果item是普通表单字段
				if (item.isFormField()) {
					String name = item.getFieldName(); // 得到表单字段的name属性值
					String value = item.getString("gbk"); // 得到表单字段值，编码采用gbk
					request.setAttribute(name, value);
				} else {
					String name = item.getFieldName();
					String value = item.getName(); // 得到上传文件的路径(根据浏览器不同可能会有所差异)
					int start = value.lastIndexOf("\\");
					String fileName = value.substring(start + 1); // 截取最后一个\之后的字符，即行到上传文件名
					request.setAttribute(name, fileName);

					item.write(new File(path, fileName)); // 在硬盘上写入文件

					// 自己用流写的方法
					// OutputStream os = new FileOutputStream(new
					// File(path,fileName));
					// InputStream is = item.getInputStream();
					// byte[] buffer = new byte[500];
					// int length = 0;
					// while((length = is.read(buffer))>0){
					// os.write(buffer, 0, length);
					// }
					// os.close();
					// is.close();
				}
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		request.getRequestDispatcher("upload/result.jsp").forward(request,
				response);
	}
}