从容器（pythonfrontend）调用端点到简单的javabackend应用程序

2024-10-01 15:36:40 发布

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我有一个简单的spring boot java后端应用程序，它从列表中获取元素（endpoint/get/{id}），并将元素添加到列表中（endpoint/add/{product}）：

@RestController
public class DemoController {

    List<String> products = Arrays.asList("test");

    @PostMapping(path="/add/{product}")
    public int addProduct(@PathVariable final String product){
        products.add(product);
        return products.size()-1;
    }

    @GetMapping(path="/get/{id}")
    public String getValue(@PathVariable final int id){
        return products.get(id);
    }
}

作为前端，我有一个简单的python应用程序，如：

from flask import Flask, request
import requests as r
import os
app = Flask(__name__)

@app.route("/")
def renderProduct():
    return """
            <html>
                <head>
                    <title>""" + os.environ["title"] + """</title>
                </head>    
                <form id="1" method="POST">
                    <input name="getID"/>
                    <br>
                    <input name="addID">
                    <input type="submit">
                </form>
                </html>
                """

@app.route("/", methods=["POST"])
def queryAndRender():
    builded = "<html>"
    if request.form["getID"] is not None:
        resp = r.get("http://localhost:8080/get/" + request.form["getID"])
        builded = builded + "PRODUCT:" + resp.text + "<br>"

    if request.form["addID"] is not None:
        resp = r.get("http://localhost:8080/add/" + request.form["addID"])
        builded = builded + "ADDED ID:" + resp.text + "<br>"

    builded = builded + """<html>
                            <head>
                                <title>""" + os.environ["title"] + """</title>
                            </head>
                            <form id="1" method="POST">
                                <input name="getID"/>
                                <br>
                                <input name="addID">
                                <input type="submit">
                            </form>
                            </html>
                            """

    return builded;


if __name__ == "__main__":
    app.run()

和Dockerfile：

ARG version=3.8.5-alpine3.11
FROM python:${version}

ENV title="Hello world"
ENV test testspacja
ENV FLASK_APP=/main.py

RUN pip install Flask==1.1.2
RUN pip install requests==2.22.0

COPY main.py /

EXPOSE 80/tcp

ENTRYPOINT ["flask", "run"]
CMD ["-h", "0.0.0.0", "-p", "80"]

现在我可以在docker容器中运行前端：

docker run -p 8081:80 frontend

它在http://localhost:8081/下可见

现在我想在intelliJ中启动我的后端。为什么我的前端没有在端点http://localhost:8080/get/{id}和http://localhost:8080/add/{product}下“看到”后端？我可以通过浏览器给他们打电话，但为什么前端不能？我只看到：

Internal Server Error
The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.

Tags： nameformaddidlocalhosthttpinputget
1条回答
网友
1楼 · 发布于 2024-10-01 15:36:40

我认为容器的localhost与客户端的localhost不同。运行docker时尝试指定网络：

docker run  network host -p 8081:80 frontend

我想这和这里讨论的问题是一样的： Docker is listening to port specified in run command

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