FileUpload简介
*API:
** DiskFileItemFactory :磁盘文件项工厂
** ServletFileUpload: 核心解析类
** FileItem : 文件项
文件上传代码的实现
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <form action="${pageContext.request.contextPath}/FileUpload" method="post" enctype="multipart/form-data"> <input type="text" name="filename"> <input type="file" name="upload"> <input type="submit" value="上传"> </form> </body> </html>
package com.imooc.upload; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; 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.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /** * Servlet implementation class FileUpload */ @WebServlet("/FileUpload") public class FileUpload extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.getWriter().append("Served at: ").append(request.getContextPath()); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1、创建文件项工厂 DiskFileItemFactory fileFactory = new DiskFileItemFactory(); //2、创建解析类 ServletFileUpload fileParse = new ServletFileUpload(fileFactory); //3、解析请求，成多个文件项FileItem try { List<FileItem> fileItem = fileParse.parseRequest(request); for(FileItem item : fileItem) { //判断是不是普通文件 if(item.isFormField()) { //普通文件 String name = item.getFieldName();//普通文件名 String value = item.getString("UTF-8"); //普通文件值 System.out.println(name+" "+value); }else { //文件上传项 String fileName = item.getName();//获取文件名 //获取文件流 InputStream content = item.getInputStream(); //获取文件的路径 String path = getServletContext().getRealPath("/upload"); System.out.println(path); //创建输出流与输入流对接 OutputStream writeContent = new FileOutputStream(path+"\"+fileName); //将文件写入路径 int len=0; byte[] b = new byte[1024]; while((len=content.read(b))!=-1) { writeContent.write(b, 0, len); } content.read(); writeContent.close(); } } } catch (FileUploadException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }