本文实例为大家分享了javaweb实现文件上传的具体代码，供大家参考，具体内容如下
1.创建文件上传页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>文件上传页面</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/upload" enctype="multipart/form-data" method="post">
文件:<input type="file" name="file1"/><br>
<input type="submit" value="提交"/>
</form>
</body>
</html>2.文件上传Servlet
package com.whoami.servlet;
import com.whoami.utils.UploadUtils;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
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.File;
import java.io.IOException;
@WebServlet(name = "UploadController",value = "/upload")
@MultipartConfig(maxFileSize = 1024*1024*100,maxRequestSize = 1024*1024*200)
public class UploadController extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//实现文件上传
// 1.设置乱码
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
// 2.获取请求的数据
Part part = request.getPart("file1"); //获取文件提交的数据
// 3.获取保存文件的路径 真实路径
String uploadPath = request.getServletContext().getRealPath("/WEB-INF/upload");
File file = new File(uploadPath);
if(!file.exists()){
file.mkdir(); //新建upload文件
}
// 4.文件上传（保存）
//生成唯一文件名 防止文件覆盖
String oldName = part.getSubmittedFileName();
String newName = UploadUtils.newFileName(oldName);
part.write(uploadPath "\\" newName);
// 5. 响应客户端 上传成功！
response.getWriter().println(part.getSubmittedFileName() "上传成功!!");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
}3.生成唯一的文件名
package com.whoami.utils;
import java.util.UUID;
public class UploadUtils {
public static String newFileName(String filename){
return UUID.randomUUID().toString().replace("-","") "_" filename;
}
}
//UUID.randomUUID().toString()会
//生成随意ID（像这样的6c0766ef-de8d-415a-83bd-fbc3ebd7a306）
//replace("-","")是用空白替换-4.上传结果
我把文件存到了项目的WEB-INF/upload下面
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持Devmax。