fileupload上传文件

FileUpload 是 Apache commons下面的一个子项目，用来实现Java环境下面的文件上传功能，

commons- fileupload-1.2.1：http://l7.yunpan.cn/lk/Qv7QNNd7KJjFM

依赖于

commons-io-1.4：http://l7.yunpan.cn/lk/Qv7Qpp3qapF9A

 

demo参考

package com.sunflower.servlet;import java.io.File;import java.io.IOException;import java.util.Iterator;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.FileItemFactory;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class FileUpload extends HttpServlet {/** *  */private static final long serialVersionUID = 1L;//Post方法protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//设置编码req.setCharacterEncoding("UTF-8");//文件上传处理fileControl(req, resp);}/** * 上传文件的处理 */private void fileControl(HttpServletRequest req, HttpServletResponse resp) throws ServletException {// 在解析请求之前先判断请求类型是否为文件上传类型//boolean isMultipart = ServletFileUpload.isMultipartContent(req);// 文件上传处理工厂FileItemFactory factory = new DiskFileItemFactory();//创建临时文件目录//File tempFile = new File(req.getRealPath("/temp"));File tempFile = new File(this.getServletContext().getRealPath("/temp"));//设置缓存大小((DiskFileItemFactory) factory).setSizeThreshold(1024*1024);//设置临时文件存放地点((DiskFileItemFactory) factory).setRepository(tempFile);// 创建文件上传处理器ServletFileUpload upload = new ServletFileUpload(factory);//将页面请求传递信息最大值设置为50Mupload.setSizeMax(1024*1024*50);//将单个上传文件信息最大值设置为6Mupload.setFileSizeMax(1024*1024*12);// 开始解析请求信息List items = null;try {items = upload.parseRequest(req);}catch (FileUploadException e) {e.printStackTrace();}// 对所有请求信息进行判断Iterator iter = items.iterator();while (iter.hasNext()) {FileItem item = (FileItem) iter.next();// 信息为普通的格式if (item.isFormField()) {String fieldName = item.getFieldName();String value = item.getString();System.out.println("formfile文件名为："+fieldName+"值："+value);req.setAttribute(fieldName, value);}// 信息为文件格式else {long d =item.getSize();if(d>upload.getSizeMax()){try {resp.sendRedirect("/index");} catch (IOException e) {e.printStackTrace();}}String fileName = item.getName();System.out.println("upload_file文件名为："+fileName);int index = fileName.lastIndexOf("\\");fileName = fileName.substring(index+1 );System.out.println("upload_file文件名为："+fileName);System.out.println("文件大小"+d);req.setAttribute("realFileName", fileName);//写进文件String basePath = this.getServletContext().getRealPath("/uploadFile");System.out.println("basePath  is :  "+basePath);File file = new File(basePath, fileName);try {item.write(file);System.out.println("写入成功！");}catch (Exception e) {e.printStackTrace();}}}//try {//req.getRequestDispatcher("/download.jsp").forward(req, resp);//}//catch (IOException e) {//e.printStackTrace();//}}}