中文XML论坛--UFOUpload组件实现文件上传

UFOUpload实现文件上传

1、UFOUpload介绍：UFOUpload组件是一个运行在Jsp Web Server上的程序，它解析contentType为"multipart/"的Http连接，实现文件上传的组件。

2、如何使用UFOUpload组件？
以UFO Web Server为例（其它Jsp Web Server类似），把UFOUpload_V100.jar放到\lib目录下；即可使用。

3、下面举例介绍如何使用它的文件上传功能。

示例1
getString（）得到表单数据内容，isFormField（）可判断是否为普通的表单项。

UFOdemo1.html

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">
    <title>File upload</title>
</head>
<body>
       //必须是multipart的表单数据。
    <form name="myform" action="UFOdemo1.jsp" method="post"
       enctype="multipart/form-data">
       Your name: <br>
       <input type="text" name="name" size="15"><br>
       File:<br>
       <input type="file" name="myfile"><br>
       <br>
       <input type="submit" name="submit" value="Commit">
    </form>
</body>
</html>

UFOdemo1.jsp

<%@ page language="java" contentType="text/html; charset=GB2312"%>
<%@ page import="java.util.*"%>
<%@ page import="com.gm365.upload.*"%>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312">
<title>UFOUpload例子1</title>
</head>
<body>
<%
   UFOUpload upload=new UFOUpload();
   ArrayList items=upload.parseRequest(request);

   if (items!=null){
     for (int i=0; i<items.size(); i++){
       UFOFile item=(UFOFile)items.get(i);

       if (item.isFormField()) {//如果是普通表单项目，显示表单内容。
         String fieldName = item.getFieldName();
         if (fieldName.equals("name")){ //对应demo1.html中type="text" name="name"
           out.print("the field name is: "+item.getString());//显示表单内容。
           out.print("<br>");
         }
       }
       else{//如果是上传文件，显示文件名。
        out.print("the upload file name is: "+item.getPathFileName());
        out.print("<br>");
       }
     }
   }
   upload.close();
%>
</body>
</html>

运行结果：仅显示表单内容，显示上传文件名，不对上传的文件进行保存。

示例2
上传两个文件到指定的目录。

UFOdemo2.html
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GB2312">
    <title>File upload</title>
</head>
<body>
    <form name="myform" action="UFOdemo2.jsp" method="post"
       enctype="multipart/form-data">
       File1:<br>
       <input type="file" name="myfile1"><br>
       File2:<br>
       <input type="file" name="myfile2"><br>
       <br>
       <input type="submit" name="submit" value="Commit">
    </form>
</body>
</html>

UFOdemo2.jsp
<%@ page language="java" contentType="text/html; charset=GB2312"%>
<%@ page import="java.util.*"%>
<%@ page import="com.gm365.upload.*"%>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB2312">
<title>UFOUpload例子1</title>
</head>
<body>
<%
   UFOUpload upload=new UFOUpload();
   ArrayList items=upload.parseRequest(request);
   String uploadPath="D:\\temp";

   if (items!=null){
     File uploadDir=new File(uploadPath);
     if (!uploadDir.exists()){
        uploadDir.mkdirs();
     }

     for (int i=0; i<items.size(); i++){
       UFOFile item=(UFOFile)items.get(i);
       String fileName=item.getFileName();
         if (fileName!=null){
     try{
       item.saveAs(uploadPath+"/"+fileName);
              out.print("the upload file to: "+uploadPath+"/"+fileName);
              out.print("<br>");
            }
            catch (Exception e){
            }
         }
     }
   }
   upload.close();
%>
</body>
</html>
运行结果：显示文件上传保存的路径，并且将文件保存

示例3
上传一个文件到指定的目录，并限定文件大小。

UFOdemo3.html
<HTML>
<HEAD>
<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=gb2312">
<TITLE>UFOUpload实现文件上传</TITLE>
</HEAD>
<BODY>
<P>UFOUpload实现文件上传</P>

<FORM NAME="fileupload" ACTION="UFOdemo3.jsp" method="POST" ENCTYPE="multipart/form-data">

<P>名称：<INPUT TYPE=TEXT NAME="name" SIZE=12 value="小明"></P>
<P>性别：<INPUT TYPE=TEXT NAME="sex" SIZE=12 value="男"></P>
<P>年龄：<INPUT TYPE=TEXT NAME="age" SIZE=12 value="28"></P>
<P>文件：<INPUT TYPE=FILE NAME="file" SIZE=12></P>
<P><INPUT TYPE=SUBMIT NAME="submit" VALUE="确定"></P>
</FORM>
</BODY>
</HTML>

UFOdemo3.jsp
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="com.gm365.upload.*" %>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>文件传输例子</title>
</head>

<body>
<%
   boolean isMultipart=UFOUpload.isMultipartContent(request);   //检查表单中是否包含文件
   if (isMultipart){
     UFOUpload upload=new UFOUpload();
     upload.setSizeMax(204800);       //允许的最大文件尺寸
     upload.setAllowedFiles("gif,jpg,jpeg");

     ArrayList items=upload.parseRequest(request);
     if (items!=null){

       String storeDir=request.getRealPath("/upload_files");
       File storeDirF=new File(storeDir);
       if (!storeDirF.exists()){
          storeDirF.mkdirs();
       }

       for (int i=0; i<items.size(); i++){
         UFOFile fi=(UFOFile)items.get(i);
         if (fi.isFormField()){    //如果是表单字段
%>
<%=fi.getFieldName()%>: <%=fi.getString()%><BR>
<%
         }
         else{   //如果是文件
           String fileName=fi.getFileName();
           if (fileName!=null && !fileName.equals("")){
              File dstFile=new File(storeDir, fileName);

              System.out.println("fileName="+fileName);
              System.out.println("storeDir="+storeDir);
              System.out.println("dstFile="+dstFile.getAbsolutePath());
%>
文件被上传到服务上的实际位置：<%=dstFile.getAbsolutePath()%><br>

<%
              fi.saveAs(dstFile);
            }
        }
     }
   }
   upload.close();
}
%>
</body>
</html>

运行结果：显示UFOdemo3.html提交的表单内容，并保存上传文件于E:\UFO\webapps\ROOT\upload_files下（上传文件必须是GIF,JPG,JPEG的图片文件）。

示例4
利用Servlet来实现文件上传。

UFOdemo4.html
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">
    <title>UFOUpload servlet Demo</title>
</head>
<body>
   <form name="myform" action="/servlet/Upload" method="post"
       enctype="multipart/form-data">
       File:<br>
       <input type="file" name="myfile"><br>
       <br>
       <input type="submit" name="submit" value="Commit">
    </form>
</body>
</html>

Upload.java
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.gm365.upload.*;

public class Upload extends HttpServlet{

  private String tempPath="d:\\temp\\buffer\\";

  public void doPost(HttpServletRequest request, HttpServletResponse response)
         throws IOException, ServletException{

    UFOUpload upload=null;
    try{
      upload=new UFOUpload();
      ArrayList items=upload.parseRequest(request);

      if (items!=null){
        for (int i=0; i<items.size(); i++){
          UFOFile fi=(UFOFile)items.get(i);
          if (fi.isFile()){
            String fileName=fi.getFileName();
            if (fileName!=null){
              System.out.println("fileName="+fileName);
              File savedFile=new File(tempPath, fileName);
              fi.saveAs(savedFile);
              System.out.print("upload succeed");
            }
          }
        }
      }
    }
    catch (Exception e) {
     //可以跳转出错页面
     e.printStackTrace();
    }
    if (upload!=null){
      upload.close();
    }
  }

  public void init() throws ServletException{
    File tempPathFile=new File(tempPath);
    if (!tempPathFile.exists()){
      tempPathFile.mkdirs();
    }
  }
}
运行结果：将上传文件保存于d:\\temp\\buffer\\下。


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