JSP实现文件上传(java的io流实现)

package com.yilong.servlet; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.Date; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class FileUploadServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("gbk"); response.setContentType("text/html;charset=gbk"); String filePath = request.getParameter("filePath"); System.out.println(filePath); int index1 = filePath.lastIndexOf("\\"); int index2 = filePath.lastIndexOf("."); String fileName = filePath.substring(index1 + 1); String fileType = filePath.substring(index2); File file = new File(filePath); long fileSize = file.length(); if (fileSize >=2 * 1024 * 1024) { response.sendRedirect("/JSP_Yilong_FileUpload/uploaderror.jsp"); } else { FileInputStream fin = new FileInputStream(file); BufferedInputStream bin = new BufferedInputStream(fin); //FileUploadDao fileUploadDao = new FileUploadDao(); Date date = new Date(); String fileNameEn = "file" + date.getTime() + fileType; System.out.println(fileNameEn); //fileUploadDao.saveFile(fileName, fin.available(),fileNameEn); FileOutputStream fout = new FileOutputStream("../webapps/JSP_Yilong_FileUpload/file/" + fileNameEn);//当前路径为tomcat安装目录下的bin文件夹(servlet的当前路径) BufferedOutputStream bout = new BufferedOutputStream(fout); int b = bin.read(); while (b != -1) { bout.write(b); b = bin.read(); } bout.close(); fout.close(); bin.close(); fin.close(); response.sendRedirect("/JSP_Yilong_FileUpload/uploadsuccess.jsp"); } } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }