servlet实现多文件上传

迷雾雪兰

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java

1.fileupload.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
     String path = request.getContextPath();
     String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'fileupload.jsp' starting page</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="FileUpLoad" enctype="multipart/form-data" method="post" >
               用户名：<input type="text" name="usename"> <br/>
               上传文件：<input type="file" name="file1"><br/>
            上传文件： <input type="file" name="file2"><br/>
              <input type="submit" value="提交"/>
     </form>
</body>
</html>

2.实际处理文件上传的 FileUpLoad.java

package com.servlet.fileupload;
   import java.io.File;
   import java.io.*;
   import java.io.IOException;
   import java.io.PrintWriter;
   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;

public class FileUpLoad extends HttpServlet {

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

       request.setCharacterEncoding("utf-8"); //设置编码

     //获得磁盘文件条目工厂
      DiskFileItemFactory factory = new DiskFileItemFactory();
       //获取文件需要上传到的路径
      String path = this.getServletContext().getRealPath("/upload");
        factory.setRepository(new File(path));
        //设置缓存的大小，当上传文件的容量超过该缓存时，直接放到暂时存储室
        factory.setSizeThreshold(1024*1024) ;

        //高水平的API文件上传处理
        ServletFileUpload upload = new ServletFileUpload(factory);
        try {
            //可以上传多个文件
           List<FileItem> list =upload.parseRequest(request);

          for(FileItem item : list)
            {
                //获取表单的属性名字
                String name = item.getFieldName();

              //如果获取的表单信息是普通的文本信息
                if(item.isFormField())
                {
                    //获取用户具体输入的字符串，名字起得挺好，因为表单提交过来的是字符串类型的
                    String value = item.getString() ;

                    request.setAttribute(name, value);
                }
               //对传入的非简单的字符串进行处理，比如说二进制的图片，电影这些
                else
              {
                    /**
                     * 以下三步，主要获取上传文件的名字
                    */
                    //获取路径名
                   String value = item.getName() ;
                    //索引到最后一个反斜杠
                    int start = value.lastIndexOf("\\");
                   //截取上传文件的字符串名字，加1是去掉反斜杠，
                   String filename = value.substring(start+1);
                   request.setAttribute(name, filename);

                   //真正写到磁盘上

                  OutputStream out = new FileOutputStream(new File(path,filename));
                  InputStream in = item.getInputStream() ;

                 int length = 0 ;
                 byte [] buf = new byte[1024] ;

               System.out.println("获取上传文件的总共的容量："+item.getSize());

                   // in.read(buf) 每次读到的数据存放在   buf 数组中
                 while( (length = in.read(buf) ) != -1)
                  {
                       //在   buf 数组中取出数据写到（输出流）磁盘上
                     out.write(buf, 0, length);

                   }

                 in.close();
                  out.close();
               }
      }

} catch (FileUploadException e) {
           // TODO Auto-generated catch block
          e.printStackTrace();
       }
catch (Exception e) {
          e.printStackTrace();
}

    request.getRequestDispatcher("filedemo.jsp").forward(request, response);

}
}

3.filedemo.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
    String path = request.getContextPath();
   String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
   <head>
   <base href="<%=basePath%>">

    <title>My JSP 'filedemo.jsp' starting page</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>
    用户名：${requestScope.usename } <br/>
    文件：${requestScope.file1 }<br/>
    ${requestScope.file2 }<br/>
   
    <img alt="go" src="upload/<%=(String)request.getAttribute("file1")%> " />

</body>
</html>

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checkbox实现全选 | servlet实现文件的下载

2014-12-12 10:44
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