UnknownHostException：名称或服务未知 [英] UnknownHostException: name or service not known

问题描述

我正在尝试使用com.squareup.okhttp中的OkHttpClient从API返回一些数据。我遇到了一些我最终能够克服的错误但是我无法通过这个主机异常错误，这里的任何内容似乎都不足以让我的情况能够解决。

I'm attempting to return some data from an API using OkHttpClient in com.squareup.okhttp. I've run into a few errors that i have eventually been able to overcome but i can't get past this host exception error and nothing on here seems to be specific enough to my case to be able to solve.

以下是我尝试过的代码及其输出，如果有人知道如何克服错误我会很感激。

Below is the code i have attempted along with the output with it, if anyone has any idea how to overcome the error i would appreciate it.

代码

public void connect() {         
    OkHttpClient client = new OkHttpClient();

    com.squareup.okhttp.Request request = new com.squareup.okhttp.Request.Builder()
    .url("https://socialweb-analytics.lcloud.com/api/public/reports/jobs?companyKey=ato")
    .get()
    .addHeader("authorization", "Basic c2RidXNpbmVzc2FuYWx5dGljc0BhdG8uZ292LmF1OkFuYWx5dGljezEh")
    .addHeader("cache-control", "no-cache")
    .addHeader("postman-token", "65ef5553-77b5-053f-9c01-4fdf76bdc92f")
    .build();

    System.out.println(request.toString());

    try {
        Response response = client.newCall(request).execute();
        System.out.println(response);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

输出

Request{method=GET, url=https://socialweb-analytics.lcloud.com/api/public/reports/jobs?companyKey=ato, tag=null}
java.net.UnknownHostException: socialweb-analytics.lcloud.com: Name or service not known
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
    at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:922)
    at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1314)
    at java.net.InetAddress.getAllByName0(InetAddress.java:1267)
    at java.net.InetAddress.getAllByName(InetAddress.java:1183)
    at java.net.InetAddress.getAllByName(InetAddress.java:1119)
    at com.squareup.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
    at com.squareup.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:187)
    at com.squareup.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:156)
    at com.squareup.okhttp.internal.http.RouteSelector.next(RouteSelector.java:98)
    at com.squareup.okhttp.internal.http.HttpEngine.createNextConnection(HttpEngine.java:344)
    at com.squareup.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:327)
    at com.squareup.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:245)
    at com.squareup.okhttp.Call.getResponse(Call.java:267)
    at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:224)
    at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:195)
    at com.squareup.okhttp.Call.execute(Call.java:79)
    at technical_services.persistence.lithium.LithiumDataStore.connect1(LithiumDataStore.java:127)
    at application.lithium_etl.LithiumTestController.main(LithiumTestController.java:24)

推荐答案

对于像java.net.UnknownHo这样的错误stException：[hostname]

For error like "java.net.UnknownHostException: [hostname]"

原因是你的主机名不在/ etc / hosts中，解决方案很简单：

The reason is your hostname is not in /etc/hosts, The solution is simple:

sudo vim /etc/hosts

更改行看起来像：

127.0.0.1  localhost

到：

127.0.0.1  [hostname] localhost

保存并退出。如果问题仍然存在，可能需要重新启动或运行：

Save and exit. If the problem still exist, may be you need to restart or run :

sudo ifconfig eth0 down&&sudo ifconfig eth0 up

希望它可以帮到你！

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