假设你要把 upload.jsp 运行在 tomcat docker 容器里
<%@ page import="java.io.*, java.util.*" %>
<%@ page import="javax.servlet.http.Part" %>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page isErrorPage="false" %>
<%@ page session="true" %>
<!DOCTYPE html>
<html>
<head>
<title>File Upload</title>
</head>
<body>
<h1>Upload a JSP File</h1>
<form action="upload.jsp" method="post" enctype="multipart/form-data">
<label for="file">Choose JSP File:</label>
<input type="file" name="file" id="file" accept=".jsp"><br><br>
<input type="submit" value="Upload File">
</form>
<%
try {
if ("POST".equalsIgnoreCase(request.getMethod())) {
// Enable multipart handling
Part filePart = request.getPart("file");
String fileName = filePart.getSubmittedFileName();
String uploadPath = application.getRealPath("/") + "uploads/";
// Create uploads directory if it doesn't exist
File uploadDir = new File(uploadPath);
if (!uploadDir.exists()) {
uploadDir.mkdirs();
}
// Save the uploaded file
try (InputStream inputStream = filePart.getInputStream();
FileOutputStream outputStream = new FileOutputStream(uploadPath + fileName)) {
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
out.println("<p>File uploaded successfully to: " + uploadPath + fileName + "</p>");
}
}
} catch (IllegalStateException e) {
out.println("<p>Error: Multipart configuration is missing or file size exceeds limits.</p>");
} catch (Exception e) {
out.println("<p>Error uploading file: " + e.getMessage() + "</p>");
}
%>
</body>
</html>在宿主机的目录结构如下：
webapp/
WEB-INF/
classes/
lib/
web.xml
upload.jspweb.xml 内容（不配置 servlet 好像也能访问，但应该会影响功能）
<web-app>
<servlet>
<servlet-name>FileUploadServlet</servlet-name>
<jsp-file>/upload.jsp</jsp-file>
<multipart-config>
<!-- Temporary location for uploaded files -->
<location>/tmp</location>
<!-- Max file size -->
<max-file-size>10485760</max-file-size> <!-- 10 MB -->
<!-- Max request size -->
<max-request-size>20971520</max-request-size> <!-- 20 MB -->
<!-- File size threshold before writing to disk -->
<file-size-threshold>5120</file-size-threshold> <!-- 5 KB -->
</multipart-config>
</servlet>
<servlet-mapping>
<servlet-name>FileUploadServlet</servlet-name>
<url-pattern>/upload.jsp</url-pattern>
</servlet-mapping>
</web-app>然后在 webapp/ 的同级目录运行
docker run -it --rm \
-p 8080:8080 \
-v ./webapp:/usr/local/tomcat/webapps/webapp \
tomcat:9.0 \
/usr/local/tomcat/bin/catalina.sh jpda run