form表单上传域（type="file"）的使用----上传文件
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");
}
}
