【JAVA WEB应用开发】14-1文件上传

却尘 · 发表于 2023-5-17 09:30:28

文件上传，后台代码

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;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Collection;

@WebServlet(name="upload",urlPatterns={"/upload"})

//处理文件上传的Servlet需要使用@MultipartConfig注解来修饰

@MultipartConfig

public class UploadServlet extends HttpServlet {

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

response.setContentType("text/html; charset=GBK");

//设置响应的报头信息

PrintWriter out = response.getWriter();

//获取响应的对象输出流

request.setCharacterEncoding("GBK");

//对客户端请求进行重新编码

Part part = request.getPart("file");

//获取指定的文件上传域。若为getParts()则可以获取所有的文件上传域

out.println("上传文件的类型为："+part.getContentType()+"<br/>");

//获取part上传文件的文件类型

Collection<String> headerNames = part.getHeaderNames();

//part.getHeaderNames()获取文件上传域的Header Name

for(String headerName : headerNames){

out.println(headerName+"--->"+part.getHeader(headerName)+"<br/>");

}

String fileNameInfo = part.getHeader("content-disposition");

String fileName=fileNameInfo.substring(fileNameInfo.indexOf("filename=\"")+13,fileNameInfo.length() - 1);

System.out.print(getServletContext().getRealPath("/uploadFiles")+"/"+fileName);

part.write(getServletContext().getRealPath("/uploadFiles")+"/"+fileName);

}

前端代码：

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>

<!DOCTYPE html>

<html>

<head>

</head>

<body>

选择文件：<input type="file" id="file" name="file" /><br/>

</form>

</body>

</html>

		自动登录	找回密码
密码			立即注册