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这篇文章将为大家详细讲解有关web开发中Form表单上传文件type="file"的用法示例，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
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");
}
}关于“web开发中Form表单上传文件type="file"的用法示例”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，使各位可以学到更多知识，如果觉得文章不错，请把它分享出去让更多的人看到。
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