英文:
How to expose port 8000 to remote access using HttpServer class?
问题
以下是翻译好的内容：
我创建了这个小型 API 来在一个遗留系统上提供一些 JSON 数据。我不能向其中添加 Spring 或任何库，所以我认为这可能是一个简单的方法。尽管在本地使用 curl localhost:8000/jms/health 可以正常工作，但是当我尝试远程访问时，连接被拒绝了。运行 netstat 命令返回了以下结果：
[userName@machineIp ~]$ sudo netstat -nlpt | grep 8000
tcp 0 0 127.0.0.1:8000 0.0.0.0:* LISTEN 25638/java
这是相关的类代码：
package somePackage;
import com.sun.net.httpserver.HttpServer;
import org.slf4j.Logger;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.Executors;
public class HealthHttp {
public static void init(Logger log) throws IOException {
HttpServer server = HttpServer.create(new InetSocketAddress("localhost", 8000), 0);
server.createContext("/jms/health", http -> {
String body = "{\"hello\":\"world\"}"; // 任何有效的 JSON 数据
byte[] bytes = body.getBytes(StandardCharsets.UTF_8);
http.getResponseHeaders().set("Content-Type", "application/json; charset=" + StandardCharsets.UTF_8);
http.sendResponseHeaders(200, bytes.length);
OutputStream output = http.getResponseBody();
output.write(bytes);
output.flush();
output.close();
});
server.setExecutor(Executors.newFixedThreadPool(1));
server.start();
log.info("Http health server initialized");
}
}
您如何修复这个问题呢？
英文:
I made this tiny api to provide some json on a legacy system. I cannot add Spring or any library to it and thought this would be a simple way. Although it works locally using curl localhost:8000/jms/health, when I try it remotely the connection is refused. Running netstat returned me this:
[userName@machineIp ~]$ sudo netstat -nlpt | grep 8000
tcp 0 0 127.0.0.1:8000 0.0.0.0:* LISTEN 25638/java
And this is the class:
package somePackage;
import com.sun.net.httpserver.HttpServer;
import org.slf4j.Logger;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.Executors;
public class HealthHttp {
public static void init(Logger log) throws IOException {
HttpServer server = HttpServer.create(new InetSocketAddress("localhost", 8000), 0);
server.createContext("/jms/health", http -> {
String body = "{\"hello\":\"world\"}"; // any valid json
byte[] bytes = body.getBytes(StandardCharsets.UTF_8);
http.getResponseHeaders().set("Content-Type", "application/json; charset=" + StandardCharsets.UTF_8);
http.sendResponseHeaders(200, bytes.length);
OutputStream output = http.getResponseBody();
output.write(bytes);
output.flush();
output.close();
});
server.setExecutor(Executors.newFixedThreadPool(1));
server.start();
log.info("Http health server initialized");
}
}
How can I fix this?
答案1
得分: 0
根据问题的评论建议，将localhost更改为0.0.0.0允许来自所有外部地址和回环地址的连接。
英文:
As suggested at the question's comments, changing localhost to 0.0.0.0 allowed connections from all external addresses and the loopback
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