day24（JAVAWEB上传与下载）

<form action="提交地址" method="post" enctype="multipart/form-data">
　　<input type="text" name="info"/></br>
　　<input type="file" name="filename"/>
　　<input type="submit" value="上传"/>
</form>

package com.baidu.upload;

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 FileUploadServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		try {
			//获取磁盘工厂
			DiskFileItemFactory dfif=new DiskFileItemFactory();
			//获取核心类
			ServletFileUpload sfu=new ServletFileUpload(dfif);
			//对核心类对象进行编码，  解决了文件名字中的乱码
			sfu.setHeaderEncoding("UTF-8");
			//获取提交参数集合（每一个表单项FileItem）
			List<FileItem> list = sfu.parseRequest(request);
			for (FileItem fileItem : list) {
				//判断是否是普通项
				if (fileItem.isFormField()) {
					//普通项
					String name = fileItem.getName();
					String value = fileItem.getString("UTF-8");
					System.out.println(name+" "+value);
				} else {
					//文件项
					//获取文件的名字
					String fieldName = fileItem.getName();
					//设置服务器存储路径
					String dir="C:\\Users\\Administrator\\Desktop\\develop";
					//使用文件项流进行流的对接
					fileItem.write(new File(dir,fieldName));
					fileItem.delete();
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}

package com.baidu.controller;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.baidu.utils.DownloadUtils;


public class FileDownloadServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//接收参数
		String filePath = request.getParameter("path");
　　　　　　　　　　//对接收来的数据进行重新编码
		String fileName = new String(request.getParameter("name").getBytes("ISO-8859-1"),"utf-8");
		String file=filePath+"\\"+fileName;
		//设置两头一流Content-type  Content-disposition  文件输出流
		String type = getServletContext().getMimeType(file);
　　　　　　　　　　//设置响应头部的类型
		response.setContentType(type);
		response.setHeader("Content-Disposition", "attachment;filename="+file);
		
		//获取浏览器的类型
		//String header = request.getHeader("User-Agent");
		//if ("Firefox".equalsIgnoreCase(header)) {
			//file = DownloadUtils.base64EncodeFileName(file);
		//} else {
			//file = URLEncoder.encode(file,"UTF-8");
		//}
　　　　　　　　　　//获取输入流对象  把要下载的文件作为输入流对象参数
		InputStream ips=new FileInputStream(file);
　　　　　　　　　　//获取响应输出流对象  响应为页面
		ServletOutputStream outputStream = response.getOutputStream();
		int len=0;
		byte[] bt=new byte[1024*1024*3];
		while((len=ips.read(bt))!=-1){
			outputStream.write(bt, 0, len);
		}
		ips.close();
		outputStream.close();
	}


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

}

private File file;	//对应前台的file的name属性
	private String fileContentType;	//对应File+ContextType
	private String fileFileName;	//对应File+FileName;
	public File getFile() {
		return file;
	}
	public void setFile(File file) {
		this.file = file;
	}
	public String getFileContentType() {
		return fileContentType;
	}
	public void setFileContentType(String fileContentType) {
		this.fileContentType = fileContentType;
	}
	public String getFileFileName() {
		return fileFileName;
	}
	public void setFileFileName(String fileFileName) {
		this.fileFileName = fileFileName;
	}
	public String execute(){
		try {
			FileUtils.copyFile(file, new File("E:/server",fileFileName));
		} catch (IOException e) {
			e.printStackTrace();
		}
		return SUCCESS;
	}

<action name="upload" class="com.baidu.web.action.UploadAction" method="execute">
			<result name="success">/success.jsp</result>
			<!-- 配置上传文件监听器 -->
			<interceptor-ref name="fileUpload">
				<!-- 配置上传文件的大小 -->
				<param name="maximumSize"></param>
				<!-- 上传文件扩展名 -->
				<param name="allowedExtensions">bmp,txt,xml,doc,java</param> <!-- 设置上传文件允许的后缀名，多个使用逗号分开 -->
				<!-- 配置上传文件的类型 -->
				<param name="allowedTypesSet">application/java</param>
				
			</interceptor-ref>
			<interceptor-ref name="defaultStack"/>
		</action>