java.net.ConnectException:连接拒绝(连接拒绝)：Docker + Spring

Question

我有一个要使用的外部API，为此我使用了WebTarget。

private final String target_url = "http://localhost:3000/models";
WebTarget target = client.target(target_url);
GenericType<List<Model>> genericType = new GenericType<List<Model>>() {};
List<Model> modelList = target.request(MediaType.APPLICATION_JSON_VALUE).get(genericType);

server.port=3001

它在没有停靠器的情况下工作正常，我可以在http://localhost:3000访问外部API。

但有了码头我不能。

Dockerfile

FROM openjdk:8-jre-slim

COPY target/*.jar app.jar

ENTRYPOINT ["java","-jar","/app.jar"]

两个容器都在同一个网络中。

命令：

docker run --rm -p 3001:3001 --network external-api image-name:version

要运行外部API，我将执行

docker run --rm -p 3000:3000 --network external-api external-api-image-name:version

我还在两个容器之间执行ping。

docker exec -ti 0d1e786b3f06 ping 19c5bb4ab4d5
PING 19c5bb4ab4d5 (172.27.0.2): 56 data bytes
64 bytes from 172.27.0.2: seq=0 ttl=64 time=0.232 ms
64 bytes from 172.27.0.2: seq=1 ttl=64 time=0.098 ms
64 bytes from 172.27.0.2: seq=2 ttl=64 time=0.169 ms
64 bytes from 172.27.0.2: seq=3 ttl=64 time=0.188 ms

错误：

java.net.ConnectException: Connection refused (Connection refused)
    at java.net.PlainSocketImpl.socketConnect(Native Method) ~[na:1.8.0_292]
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_292]
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_292]
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_292]
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_292]
    at java.net.Socket.connect(Socket.java:607) ~[na:1.8.0_292]
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175) ~[na:1.8.0_292]
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:463) ~[na:1.8.0_292]
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:558) ~[na:1.8.0_292]
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:242) ~[na:1.8.0_292]
    .
    .
    .

Answer 1

容器无法在localhost中访问String target_url的问题。您应该在配置文件或属性中重写它。例如，您可以将您的target_url移动到类字段，并对其进行@Value(external.api.url)注释，并在application.propeties中添加external.api.url=your_container_name:port/uri