文件的上传Commons FileUpload(web基础学习笔记十六)
一、表单设置
<form action="<%=request.getContextPath()%>/jsp/admin/doAdd.jsp" enctype="multipart/form-data" method="post"> </form>
设置属性:
enctype="multipart/form-data";
<tr> <td class="text_tabledetail2">上传图片 </td> <td><input type="file" name="picPath" value=""/></td> </tr>
类型设置:type="file";
表单
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <%@ page language="java" import="java.util.*,com.pb.news.entity.*" pageEncoding="UTF-8"%> <html> <head> <link href="<%=request.getContextPath() %>/css/common.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="<%=request.getContextPath() %>/ckeditor/ckeditor.js"></script> </head> <body> <form name ="dataForm" id="dataForm" action="<%=request.getContextPath()%>/jsp/admin/doAdd.jsp" method="post" enctype="multipart/form-data"> <table class="tb" border="0" cellspacing="5" cellpadding="0"> <thead> <tr><td align="center" colspan="2" class="text_tabledetail2">增加新闻</td></tr> </thead> <tbody> <tr> <td class="text_tabledetail2">分类</td> <td> <!-- 列出所有的新闻分类 --> <select name="categoryId"> <option value="1">国内</option> <option value="2">国际</option> <option value="3">娱乐</option> <option value="4">军事</option> <option value="5">财经</option> <option value="6">天气</option> </select> </td> </tr> <tr> <td class="text_tabledetail2">标题</td> <td><input type="text" name="title" value=""/></td> </tr> <tr> <td class="text_tabledetail2">作者</td> <td><input type="text" name="author" value=""/></td> </tr> <tr> <td class="text_tabledetail2">摘要</td> <td><textarea id="summary" name="summary" rows="8" cols="50"></textarea></td> </tr> <tr> <td class="text_tabledetail2">内容</td> <td> <div id="xToolbar"></div> <textarea id="newscontent" name="newscontent" class="ckeditor" rows="8"></textarea> </td> </tr> <tr> <td class="text_tabledetail2">上传图片 </td> <td><input type="file" name="picPath" value=""/></td> </tr> <tr> <td style="text-align:center;" colspan="2"> <button type="submit" class="page-btn" name="save">保存</button> <input type="hidden" name="id" value=""/> <button type="button" class="page-btn" name="return" onclick="javascript:location.href='newsDetailList.jsp'">返回</button> </td> </tr> </tbody> </table> </form> </body> </html>
二、下载控件导入
采用apache的开源工具common-fileupload这个文件上传组件,
Commons FileUpload:http://commons.apache.org/proper/commons-fileupload/download_fileupload.cgi
common-fileupload是依赖于common-io这个包的，所以还需要下载这个包。
Download Commons IO:http://commons.apache.org/proper/commons-io/download_io.cgi
下载以上2个控件并导入
三、提交页面
doAdd.jsp
<%@page import="java.io.File"%> <%@page import="org.apache.commons.fileupload.FileItem"%> <%@page import="java.util.List"%> <%@page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%> <%@page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%> <%@page import="java.util.Date"%> <%@page import="com.pb.news.entity.News"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@include file="../common/common.jsp"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <% //设置页面编码 request.setCharacterEncoding("utf-8"); boolean bRet = false; boolean bUpload = false; String uploadFileName = ""; String fieldName = ""; //声明News对象 News news=new News(); //设置创建时间 news.setCreateDate(new Date()); //判断表单个是否有多个部分组成,将整个请求做做为判断 boolean isMultipart=ServletFileUpload.isMultipartContent(request); //得到上传文件的保存目录， //String uploadpath=this.getServletContext().getRealPath("/upload/"); String uploadFilePath=request.getSession().getServletContext().getRealPath("/upload/"); //判断是表单是否为多部分组成 if(isMultipart==true){ //使用Apache文件上传组件处理文件上传步骤： //1、创建一个DiskFileItemFactory工厂 DiskFileItemFactory factory=new DiskFileItemFactory(); //2、创建一个文件上传解析器 ServletFileUpload upload=new ServletFileUpload(factory); try{ //3、使用ServletFileUpload解析器解析上传数据，解析结果返回的是一个List<FileItem>集合，每一个FileItem对应一个Form表单的输入项 List<FileItem> items=upload.parseRequest(request); //遍历集合 for(FileItem item:items){ //如果是普通的数据 if(item.isFormField()){ //得到集合元素 fieldName=item.getFieldName(); //判断 if(fieldName.equals("title")){ //如果是标题，就设置新闻标题，并将字符集设置为utf-8 news.setTitle(item.getString("utf-8")); //如果是ID则 }else if(fieldName.equals("id")){ //获取ID String id = item.getString(); //判断ID是还为空 if (id != null && !id.equals("")){ news.setId(Integer.parseInt(id)); } //类别，强制类型转换 }else if (fieldName.equals("categoryId")){ news.setCategoryId(Integer.parseInt(item.getString())); //如果是摘要，设置字符编码 }else if (fieldName.equals("summary")){ news.setSummary(item.getString("UTF-8")); //如果是内容，设置字符编码 }else if (fieldName.equals("newscontent")){ news.setContent(item.getString("UTF-8")); //如果是作者名称，设置字符编码 }else if(fieldName.equals("author")){ news.setAuthor(item.getString("UTF-8")); } //如果是上传数据 }else{ //得到集合元素 String fileName = item.getName(); //判断是否为空 if(fileName!=null&&!fileName.equals("")){ //不是空得到文件名 File fullFile=new File(item.getName()); //保存路径 和名字 File saveFile = new File(uploadFilePath, fullFile.getName()); //写入文件 item.write(saveFile); //上传的文件名 uploadFileName = fullFile.getName(); //设置新闻图片牟路径和名字 news.setPicPath(uploadFileName); //上传成功 bUpload = true; } } } }catch(Exception e){ e.printStackTrace(); } } System.out.println("上传成功后的文件名是：："+news.getPicPath()); //调用后台方法，将新闻信息插入数据库 bRet=newsService.addNews(news); %> <% //判断是还上传成功 if (bRet) { //成功就跳转到列表页面 response.sendRedirect("newsDetailList.jsp"); } else { //返回添加的页面 response.sendRedirect("newsDetailCreate.jsp"); } %> </body> </html>
四、设置文件大小和类型
4.1、html页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <!-- 声明表单属性为enctype=multipart/form-data --> <form action="doupload.jsp" method="post" enctype="multipart/form-data"> <table> <tr> <td>上传者</td> <td><input type="text" name="username"/></td> </tr> <tr> <!-- 设置类型为file --> <td colspan="2"><input type="file" name="filename"/></td> </tr> <tr> <td><input type="submit" value="提交" /></td> </tr> </table> </form> <% //判断请求是还为空 Object name=request.getAttribute("name"); if(name!=null){ out.println(name.toString()+"<br/>"); } //判断请求是还为空 Object msg=request.getAttribute("msg"); if(msg!=null){ out.println(msg.toString()+"<br/>"); } //判断请求是还为空 Object imgsrc=request.getAttribute("imgsrc"); if(imgsrc!=null){ out.println(imgsrc.toString()+"<br/>"); out.println("<img src='"+imgsrc.toString()+"'/>"); } %> </body> </html>
4.2 、JSP页面
<%@page import="java.io.File"%> <%@page import="java.util.Date"%> <%@page import="java.text.SimpleDateFormat"%> <%@page import="java.util.ArrayList"%> <%@page import="org.apache.commons.fileupload.FileItem"%> <%@page import="java.util.List"%> <%@page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%> <%@page import="org.apache.commons.fileupload.FileItemFactory"%> <%@page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%> <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <% //设置出字符编码 request.setCharacterEncoding("UTF-8"); //判断整个请求做为参数，是不中有多部分组成 boolean isMutipart=ServletFileUpload.isMultipartContent(request); //设置允许上传的文件格式 List<String> filelist=new ArrayList<String>(); filelist.add(".jpg"); filelist.add(".png"); filelist.add(".gif"); if(isMutipart==true){ //创建磁盘工厂类 FileItemFactory factory=new DiskFileItemFactory(); //创建上传文件解析器 ServletFileUpload upload=new ServletFileUpload(factory); //将整个请求做为一个集合 List<FileItem> items=upload.parseRequest(request); //遍历 for(FileItem item:items){ if(item.isFormField()){ //如果是普通表单按普通表单处理 //String username=item.getFieldName(); String name=item.getString("utf-8"); request.setAttribute("name", name); }else{ //如果是上传文件 //获取文件名称 String filename=item.getName(); //获取文件扩展名 String fileext=filename.substring(filename.lastIndexOf(".")); //判断扩展名 if(filelist.contains(fileext)){ //判断文件大小小于1M可以上传 if(item.getSize()<1024*1024){ //获取文件上传路径 String uploadpath=this.getServletContext().getRealPath("upload"); //对文件重命名 SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMddhhmmss"); //当前时间加扩展名 String newfilename=sdf.format(new Date())+fileext; //文件对象 File savefile=new File(uploadpath,newfilename); //开始上传 item.write(savefile); request.setAttribute("msg", "上传成功"); request.setAttribute("imgsrc", "../upload/"+newfilename); }else{ //判断文件大小大于512K可以上传 //提示错误类型 request.setAttribute("msg","文件只能上传1M以下的 !"); } }else{ //提示错误类型 request.setAttribute("msg", "只能上传jpb,png,gif的图片"); } } } //转发到上传页面 request.getRequestDispatcher("uploadtest.jsp").forward(request, response); } %> </body> </html>