jsp处理表单上传图片(commons-fileupload-1.2.2.jar,commons-io-2.4.jar)

upload.jsp

 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
   <head>
     <title>上传图片的表单页面</title>
     <meta http-equiv="pragma" content="no-cache">
     <meta http-equiv="cache-control" content="no-cache">
     <meta http-equiv="expires" content="0">
     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
     <meta http-equiv="description" content="This is my page">
   </head>
   <body>
     <form action="uploaddo.jsp" method="post" enctype="multipart/form-data">
         <table>
             <tr>
                 <td>姓名：</td>
                 <td><input type="text" name="txtUserName" /></td>
             </tr>
             <tr>
                 <td>性别：</td>
                 <td>
                     <input type="radio" name="rdoSex" value="男" checked="checked"/>男
                     <input type="radio" name="rdoSex" value="女"/>女
                 </td>
             </tr>
             <tr>
                 <td>教育：</td>
                 <td>
                     <select name="selEdu">
                         <option value="小学">小学</option>
                         <option value="中学">中学</option>
                         <option value="大学">大学</option>
                     </select>
                 </td>
             </tr>
             <tr>
                 <td>爱好：</td>
                 <td>
                     <input type="checkbox" name="rdoHibby" value="篮球"/>篮球
                     <input type="checkbox" name="rdoHibby" value="足球"/>足球
                     <input type="checkbox" name="rdoHibby" value="排球"/>排球
                 </td>
             </tr>
             <tr>
                 <td>图片：</td>
                 <td><input type="file" name="txtPhoto" /></td>
             </tr>
             <tr>
                 <td colspan="2">
                     <input type="submit" value="提交"/>
                 </td>
             </tr>
         </table>
     </form>
   </body>
 </html>

uploaddo.jsp

 <%@ page language="java" pageEncoding="UTF-8"%>
 <%@ page import="java.util.*,java.io.*,java.lang.*" %>
 <%@ page import="org.apache.commons.fileupload.*"%>
 <%@ page import="org.apache.commons.fileupload.disk.*"%>
 <%@ page import="org.apache.commons.fileupload.servlet.*"%>
 <%
     HashMap<String,ArrayList<String>> mapField =new HashMap<String,ArrayList<String>>();
     HashMap<String,ArrayList<String>> mapFile =new HashMap<String,ArrayList<String>>();
     request.setCharacterEncoding("utf-8");
     response.setCharacterEncoding("utf-8");
     boolean isMultipart = ServletFileUpload.isMultipartContent(request);
     if (isMultipart) {
         try {
             DiskFileItemFactory factory = new DiskFileItemFactory();
             factory.setSizeThreshold(1024 * 4);//设置缓冲区4kb
             String bufferFilePath = request.getSession().getServletContext().getRealPath("temp/buffer");
             factory.setRepository(new File(bufferFilePath));//设置上传文件用到临时文件存放路径
             ServletFileUpload upload = new ServletFileUpload(factory);
             upload.setFileSizeMax(1024 * 1024 * 3);//设置单个文件的最大限制
             List<FileItem> items = upload.parseRequest(request);
             Iterator<FileItem> iter = items.iterator();
             while (iter.hasNext()) {
                 FileItem item = iter.next();
                 String fieldName = item.getFieldName();//获取name
                 if (item.isFormField()) {
                     //如果是表单字段
                     String fieldValue = item.getString("utf-8");//获取value
                     ArrayList<String> list = null;
                     if(mapField.containsKey(fieldName)){
                         list = mapField.get(fieldName);
                     }else{
                         list = new ArrayList<String>();
                     }
                     list.add(fieldValue);
                     mapField.put(fieldName, list);
                 } else {
                     //如果是上传控件
                     String uploadFileName = item.getName();//读取上传图片文件名称
                     if (uploadFileName != null && !uploadFileName.equals("")) {
                         String uuid = UUID.randomUUID().toString();
                         String fileType = uploadFileName.substring(uploadFileName.lastIndexOf("."));
                         String fileName = "upload/" + uuid + fileType;
                         String uploadFilePath = request.getSession().getServletContext().getRealPath("/");
                         File saveFile = new File(uploadFilePath, fileName);
                         item.write(saveFile);//保存上传图片到服务器
                         ArrayList<String> list = null;
                         if(mapFile.containsKey(fieldName)){
                             list = mapFile.get(fieldName);
                         }else{
                             list = new ArrayList<String>();
                         }
                         list.add(fileName);
                         mapFile.put(fieldName, list);
                     }
                 }
             }
         } catch (FileUploadBase.FileSizeLimitExceededException ex) {
             out.print("上传文件失败，文件超过3M。");
         } catch (FileUploadBase.IOFileUploadException ex) {
             out.print("设置上传文件用到临时文件存放路径不存在。");
         } catch (Exception ex) {
             out.print(ex);
         }
     }
 %>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
     <title>处理上传图片的表单页面</title>
     <meta http-equiv="pragma" content="no-cache">
     <meta http-equiv="cache-control" content="no-cache">
     <meta http-equiv="expires" content="0">
     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
     <meta http-equiv="description" content="This is my page">
 </head>
 <body>
     <%
         for(Map.Entry<String,ArrayList<String>> field : mapField.entrySet())
         {
             String key = field.getKey();
             List<String> values = field.getValue();
             StringBuffer sb = new StringBuffer();
             for(String value : values){
                 sb.append(value);
                 sb.append(",");
             }
             String value = sb.toString();
             out.print(String.format("name:%s,&nbsp;&nbsp;&nbsp;&nbsp;value:%s<br/>",key,value));
         }
      %>
      <hr/>
      <%
          for(ArrayList<String> values : mapFile.values())
         {
             for(String value : values){
                 out.print(String.format("<img src='%s' style='width:300px;heigth:300px'/><br/>",value));
             }
         }
      %>
 </body>
 </html>