jsp,servlet普通表单＋文件上传

import java.io.File; import java.io.IOException; import java.io.PrintWriter; import java.io.UnsupportedEncodingException; 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.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; /*处理 上传文件和普通表单的 servlet * * @author(陈烘) * */ public class formservlet extends HttpServlet { public String getStr(String str) { String s=null ; if(str!=null) { try { s = new String(str.getBytes("ISO8859-1"),"gb2312"); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); System.out.println("转码出现错误"); } } return s; } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("gb2312"); response.setContentType("text/html;charset=gb2312"); //设置合法的后缀名 final String[] allowedatt = new String[] {"doc","docx","html","htm"}; //创建该对象 DiskFileItemFactory factory = new DiskFileItemFactory(); //上传文件所用到的缓冲区大小,超过此缓冲区的部分将被写入到磁盘 factory.setSizeThreshold(4*1024); //使用fileItemFactory为参数实例化一个ServletFileUpload对象 ServletFileUpload upload = new ServletFileUpload(factory); //要求上传的form-data数据不超过1000M upload.setSizeMax(100*1024*1024); //java.util.List实例来接收上传的表单数据和文件数据 List itemList; try { itemList = upload.parseRequest(request); //迭代list中的内容 Iterator it = itemList.iterator(); //循环list中的内容 while(it.hasNext()) { //取出一个表单域 FileItem item =(FileItem) it.next(); //如果表单域是普通表单 if(item.isFormField()) { //取出表单域的name,对应input的name String name = (String)item.getFieldName(); //如果name的值是username if("username".equals(name)) { //输出username表单中的值 System.out.println(getStr(item.getString().trim())); } } //如果不是普通表单，则代表是文件上传的表单 else { //获取上传文件的名字 String totalNameatt = getStr(item.getName()); //获取文件的后缀名 String suffixatt = totalNameatt.substring(totalNameatt.lastIndexOf(".") + 1); //判断后缀名是否是我们允许上传的类型 boolean isValide=false; for(int i=0;i<allowedatt.length;i++) { if(suffixatt.equals(allowedatt[i])){ isValide=true; } } //如果是不允许的类型，输出错误信息 if(!isValide) { System.out.println(totalNameatt+"该文件类型不在允许上传的范围内"); return ; } //如果是合法的，就保存该文件，文件名不变 else { //获取项目根目录 String rootPath = this.getServletConfig().getServletContext().getRealPath("/"); //要存储的文件的绝对路径 String file = rootPath +System.currentTimeMillis()+"."+suffixatt; item.write(new File(file)); System.out.println("文件上传成功:"+file); } } } } catch (FileUploadException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }