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Form表单上传文件（type="file"）的使用

2017年12月12日  | 移动技术网IT编程  | 我要评论

一，单个文件的上传

1.html/jsp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>
<%
  string path=request.getcontextpath();
  request.setattribute("path", path);
%>
</head>
<body>
<form action="${path}/fileser" method="post" enctype="multipart/form-data">
  <table>
    <tr>
      <td>上传文件</td>
      <td> 
        <input type="file" name="filen" />
      </td>
    </tr>
    <tr>
      <td colspan="2">
        <input type="submit" />
        <input type="reset" />
      </td>
    </tr>
  </table>
  </form>
</body>
</html>

2.过滤器解决中文乱码问题

package com.ser;
import java.io.ioexception;
import javax.servlet.filter;
import javax.servlet.filterchain;
import javax.servlet.filterconfig;
import javax.servlet.servletexception;
import javax.servlet.servletrequest;
import javax.servlet.servletresponse;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
public class filter01 implements filter
{
  @override
  public void destroy()
  {
  }
  @override
  public void dofilter(servletrequest arg0, servletresponse arg1,
      filterchain arg2) throws ioexception, servletexception
  {
    httpservletrequest request= (httpservletrequest)arg0;
    httpservletresponse response=(httpservletresponse)arg1;
    request.setcharacterencoding("utf-8");
    response.setcharacterencoding("utf-8");
    response.setcontenttype("text/html charset=utf-8");
    arg2.dofilter(request, response);
  }
  @override
  public void init(filterconfig arg0) throws servletexception
  {
  }
}

3.处理html/jsp

package com.ser;
import java.io.file;
import java.io.ioexception;
import javax.servlet.servletconfig;
import javax.servlet.servletexception;
import javax.servlet.annotation.multipartconfig;
import javax.servlet.annotation.webservlet;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import javax.servlet.http.part;
/**
 * servlet implementation class fileser
 */
@webservlet("/fileser")
@multipartconfig(location="e://uploadfile",
    filesizethreshold=1024*1024*1000,
    maxfilesize=1024*1024*1000,
    maxrequestsize=1024*1024*1024
    )
public class fileser extends httpservlet {
  private static final long serialversionuid = 1l;
  private static final string location="e://uploadfile";
  /**
   * @see httpservlet#httpservlet()
   */
  public fileser() {
  }
  @override
  public void init(servletconfig config) throws servletexception
  {
    file file =new file("e://uploadfile");
    if(!file.exists()&& !file.isdirectory())
    {
      file.mkdir();
    }
  }
  /**
   * @see httpservlet#doget(httpservletrequest request, httpservletresponse response)
   */
  protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
  }
  /**
   * @see httpservlet#dopost(httpservletrequest request, httpservletresponse response)
   */
  protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
    part part= request.getpart("filen");
    string filetype=part.getcontenttype();
    string fileheader=part.getheader("content-disposition");
    //string filename=part.getname();
    long size=part.getsize();
    system.out.println(part);
    system.out.println(filetype);
    system.out.println(fileheader);
    //system.out.println(filename);
    system.out.println(size);
    string filename=fileheader.substring(fileheader.indexof("filename=")+10, fileheader.lastindexof("\""));
    part.write(filename);    
    response.getwriter().print(filename+"上传成功");
  }
}

总结

以上所述是小编给大家介绍的form表单上传域（type="file"）的使用(上传文件)，希望对大家有所帮助

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