About file uploading combat HttpServletRequest

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This link: https://blog.csdn.net/chengqiuming/article/details/100590635

A view

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 文件上传 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<form method="post" action="upload"  enctype="multipart/form-data">
    文件名：<input type="text" id="name" name="name" /><br/>
    选择文件：<input type="file" id="file" name="file" /><br/>
    <input type="submit" value="上传" /><br/>
</form>
</body>
</html>

Two Servlet definitions

package lee;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;

import java.io.*;
import java.util.*;



@WebServlet(name="upload" , urlPatterns={"/upload"})
@MultipartConfig
public class UploadServlet extends HttpServlet
{
    public void service(HttpServletRequest request ,
        HttpServletResponse response)
        throws IOException , ServletException
    {
        response.setContentType("text/html;charset=GBK");
        PrintWriter out = response.getWriter();
        request.setCharacterEncoding("GBK");
        // 获取普通请求参数
        String name = request.getParameter("name");
        out.println("普通的name参数为：" + name + "<br/>");
        // 获取文件上传域
        Part part = request.getPart("file");
        // 获取上传文件的文件类型
        out.println("上传文件的的类型为："
            + part.getContentType() + "<br/>");
        //获取上传文件的大小。
        out.println("上传文件的的大小为：" + part.getSize()  + "<br/>");
        // 获取该文件上传域的Header Name
        Collection<String> headerNames = part.getHeaderNames();
        // 遍历文件上传域的Header Name、Value
        for (String headerName : headerNames)
        {
            out.println(headerName + "--->"
                + part.getHeader(headerName) + "<br/>");
        }
        // 获取包含原始文件名的字符串
        String fileNameInfo = part.getHeader("content-disposition");
        // 提取上传文件的原始文件名
        String fileName = fileNameInfo.substring(
            fileNameInfo.indexOf("filename=\"") + 10 , fileNameInfo.length() - 1);
        // 将上传的文件写入服务器
        part.write(getServletContext().getRealPath("/uploadFiles")
            + "/" + fileName );               // ①
    }
}

Three test

About file uploading combat HttpServletRequest

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