上传页面
上传学生信息
<!DOCTYPE html><html lang="en"><head> ???<meta charset="UTF-8"> ???<title>上传学生信息</title></head><body> ???<form action="/lib/upload" method="post" enctype="multipart/form-data"> ???????学号 <input type="text" name="xuehao" id="xuehao"/> ???????<br/> ???????姓名 <input type="text" name="xingming" id="xingming"> ???????<br/> ???????密码 <input type="password" name="mima" id="mima"> ???????<br/> ???????性别 <input type="radio" name="xingbie" value="nan" checked>男 <input type="radio" name="xingbie" value="nv" >女 ???????<br/> ???????年龄 <input type="text" name="nianling" id="nianling"> ???????<br/> ???????身高 <input type="text" name="shengao" id="shengao"> ???????<br/> ???????学院 <select name="xueyuan"> ???????<option value="computer">计算机学院</option> ???????<option value="software">软件学院</option> ???</select> ???????<br/> ???????照片 <input type="file" name="zhaopian" id="zhaopian"/> ???????<br/> ???????简历 <input type="file" name="jianli" id="jianli"> ???????<br/> ???????<input type="submit" value="提交"> ???</form></body></html>
上传需要的配置信息web.xml
<servlet> ???<description></description> ???<display-name>UploadServlet</display-name> ???<servlet-name>UploadServlet</servlet-name> ???<servlet-class>com.sangewuxie.servlet.UploadServlet</servlet-class> ???<load-on-startup>0</load-on-startup> ???<multipart-config> ?????<max-file-size>52428800</max-file-size> ?????<max-request-size>52428800</max-request-size> ?????<file-size-threshold>0</file-size-threshold> ???</multipart-config> ?</servlet> ?<servlet-mapping> ???<servlet-name>UploadServlet</servlet-name> ???<url-pattern>/upload</url-pattern> ?</servlet-mapping> ?<servlet>
上传的servlet
package com.sangewuxie.servlet;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import javax.servlet.ServletException;import javax.servlet.annotation.MultipartConfig;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.Part;import com.sangewuxie.dao.StudentDao;import com.sangewuxie.domain.Student;public class UploadServlet extends HttpServlet { ???????public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { ???????request.setCharacterEncoding("utf-8"); ???????String xuehao = request.getParameter("xuehao"); ???????String xingming = request.getParameter("xingming"); ???????String mima = request.getParameter("mima"); ???????String xingbie = request.getParameter("xingbie"); ???????int nianling = Integer.parseInt(request.getParameter("nianling")); ???????int shengao = Integer.parseInt(request.getParameter("shengao")); ???????String xueyuan = request.getParameter("xueyuan"); ???????String dir = request.getServletContext().getRealPath(""); ???????????????Part zhaopianPart = request.getPart("zhaopian"); ???????String zhaopian = upload(request, zhaopianPart, dir+"\\upload\\zhaopian"); ???????Part jianliPart =request.getPart("jianli"); ????????String jianli = upload(request, jianliPart, dir+"\\upload\\jianli"); ???????Student student = new Student(xuehao, xingming, mima, xingbie, nianling, shengao, xueyuan, zhaopian, jianli); ???????StudentDao.InsertStudentInfo(student); ???????response.setContentType("text/html;charset=utf-8"); ???????response.getWriter().write("上传成功"); ???} ???/** ????* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) ????*/ ???public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????// TODO Auto-generated method stub ???????doGet(request, response); ???} ???public String upload(HttpServletRequest request,Part part,String dir) throws IOException { ???????String cd = part.getHeader("content-disposition"); ???????/** ????????* tomcat7没有getSubmittedFileName()方法
* String filename = part.getSubmittedFileName() ????????*/ ???????String filename = cd.substring(cd.lastIndexOf("=")+2, cd.length()-1); ???????String houzhui = filename.substring(filename.lastIndexOf(‘.‘)); ???????String destfilename = System.currentTimeMillis()+""; ???????destfilename = destfilename + houzhui; ???????part.write(dir+"\\"+destfilename);// ???????InputStream ist = part.getInputStream();// ???????FileOutputStream fos = new FileOutputStream(dir+"\\"+destfilename);// ???????byte[] bytes ?= new byte[1024];// ???????int size = -1;// ???????while((size = ist.read(bytes))>0){// ???????????fos.write(bytes, 0, size);// ???????}// ???????ist.close();// ???????fos.close(); ???????return destfilename; ???????????}}下载 流程
package com.sangewuxie.servlet;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.io.PrintStream;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 com.sangewuxie.dao.StudentDao;public class DownloadServlet extends HttpServlet { ???????public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????????????String xuehao = request.getParameter("xuehao"); ???????String jianli = StudentDao.getName(xuehao,"jianli");// ???????System.out.println(jianli); ???????????????if(jianli==null) { ???????????response.setContentType("text/html;charset=utf-8"); ???????????response.getWriter().write("未找到该生或该生不存在"); ???????} ???????????????else { ???????????String contentType = getServletContext().getMimeType(jianli); ???????????response.setContentType(contentType); ???????????response.setHeader("Content-Disposition", "attachment;filename="+jianli); ???????????String dir = request.getServletContext().getRealPath("")+"\\upload\\jianli\\"; ???????????String filename = dir+jianli; ???????????InputStream in = new FileInputStream(filename); ???????????OutputStream out = response.getOutputStream(); ?????????????int len; ?????????????while((len=in.read())!= -1) ?????????????{ ?????????????????out.write(len); ?????????????} ???????????????????????????in.close(); ?????????????out.close(); ?????????} ???} ???public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????????????doGet(request, response); ???}}保存到csv
package com.sangewuxie.servlet;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.io.OutputStream;import java.io.PrintStream;import java.net.URLEncoder;import java.util.ArrayList;import java.util.Iterator;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 com.sangewuxie.dao.StudentDao;import com.sangewuxie.domain.Student;public class SavecsvServlet extends HttpServlet { ???????public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????int minAge = Integer.parseInt(request.getParameter("min")); ???????int maxAge = Integer.parseInt(request.getParameter("max")); ???????ArrayList<Student> students= StudentDao.getInfo(minAge,maxAge); ???????????????response.setContentType("text/html;charset=utf-8"); ???????if(students.isEmpty()) { ???????????response.getWriter().write("未找到该数据或者数据不存在"); ???????} ???????????????else { ???????????????????????String filename = "从"+minAge+"到"+maxAge+"岁的信息.csv"; ???????????filename = URLEncoder.encode(filename,"UTF-8"); ???????????String contentType =getServletContext().getMimeType(filename); ???????????response.setContentType(contentType); ???????????response.setHeader("Content-Disposition", "attachment;filename="+filename); ???????????????????????OutputStream out = response.getOutputStream(); ????????????PrintStream ps = new PrintStream(out); ???????????ps.println("学号,姓名,性别,年龄,身高,学院"); ???????????Iterator it = students.iterator(); ?????????????while(it.hasNext()) { ???????????????Student ?student= (Student) it.next(); ???????????????ps.println(student.getXuehao()+","+student.getXingming()+","+student.getXingbie()+","+student.getNianling()+","+student.getShengao()+","+student.getXueyuan()); ???????????} ???????????ps.flush(); ???????????ps.close(); ???????????out.close(); ???????} ???????????????} ???????public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ???????doGet(request, response); ???}}个人笔记。无需细看
servlet上传与下载
原文地址：http://www.cnblogs.com/sangewuxie/p/7694655.html