struts2学习笔记十三（第13讲.Struts2的文件上传和下载续）
Struts2的文件上传和下载续接上面未完成的功能。
一、首先要去下载两个上传文件用的jar包（FileUpload和io的jar包）：
下载地址：http://commons.apache.org/
说明：下载完成之后要解压出来，分别选择里面的两个jar文件拷贝到所创建的项目中去。
FileUpload中要拷贝的：commons-fileupload-1.2.2.jar；
io中要拷贝的：commons-io-2.0.1.jar。然后就可以实现上传和下载的功能了。
二、接着上面的项目，在upload文件夹下创建upload2.jsp页面：
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=GB18030"><title>Insert title here</title></head><body><form action="" method="post" enctype="multipart/form-data">username:<input type="text" name="username"><br>password:<input type="password" name="password"><br>file1:<input type="file" name="file1"><br>file2:<input type="file" name="file2"><br><input type="submit" value="submit"></form></body></html>
三、在src目录下创建一个com.test.servlet包，并且新建一个文件上传的servlet，名称为UploadServlet，注意这里还没有使用struts2的技术：
package com.test.servlet;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintWriter;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 {DiskFileItemFactory factory = new DiskFileItemFactory();String path = request.getRealPath("/upload");factory.setRepository(new File(path));factory.setSizeThreshold(1024 * 1024);ServletFileUpload upload = new ServletFileUpload(factory);try {List<FileItem> list = upload.parseRequest(request);for(FileItem item : list){if(item.isFormField()){String name = item.getFieldName();String value = item.getString("gbk");request.setAttribute(name, value);}else{String name = item.getFieldName();String value = item.getName();int start = value.lastIndexOf("\\");String fileName = value.substring(start+1);request.setAttribute(name, fileName);item.write(new File(path,fileName));//OutputStream os = new FileOutputStream(new File(path,fileName));////InputStream is = item.getInputStream();////byte[] buffer = new byte;////int length = 0;////while((length = is.read(buffer)) > 0){//os.write(buffer,0,length);//}////os.close();////is.close();}}} catch (Exception e) {// TODO: handle exception}request.getRequestDispatcher("upload/result2.jsp").forward(request, response);}}
四、在upload文件夹下创建一个result2.jsp页面：
<body>username: ${requestScope.username }<br>password: ${requestScope.password }<br>file1: ${requestScope.file1 }<br>file2: ${requestScope.file2 }</body>
结果：能够实现上传的功能，不是基于struts2的。
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