[英]Java Send Data from server back to client
晚上好,我在這里有這個服務器和客戶端。
網絡服務器
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
public class WebServer {
public static void main(String[] args) throws Exception {
HttpServer http = HttpServer.create(new InetSocketAddress(8000), 0);
http.createContext("/test", new MyHandler());
http.setExecutor(null); // creates a default executor
http.start();
//NimServer nimserver = new NimServer(32778);
//nimserver.serve();
}
static class MyHandler implements HttpHandler {
//AtomicInteger atomicInteger = new AtomicInteger(0);
//int theValue = atomicInteger.get();
@Override
public void handle(final HttpExchange t) throws IOException {
final String response;
final String requestMethod = t.getRequestMethod();
if ("GET".equals(requestMethod)) {
// response = String.format("Besuche: %d%n", atomicInteger.addAndGet(1));
}
else if ("POST".equals(requestMethod)) {
// atomicInteger.set(0);
int clientno = new DataInputStream(t.getRequestBody()).readInt();
System.out.println("Send from Client: " + clientno);
int newclientno = clientno + 1;
System.out.println("Increased by Server: " + newclientno);
new DataOutputStream(t.getResponseBody()).writeInt(newclientno);
}
else {
throw new IOException("Unsupported method");
}
//t.sendResponseHeaders(200, response.length());
//final OutputStream os = t.getResponseBody();
//os.write(newclientno);
//os.close();
}
}
}
HttpClient的
import java.net.*;
import java.io.*;
public class HttpClient {
public static int clientno = 0;
public static void main(String[] args) throws Exception {
//NimMessage clientnumber = new NimMessage();
//clientnumber.nachricht = "Client No: " + clientno;
URL test = new URL("http://localhost:8000/test");
HttpURLConnection connect = (HttpURLConnection) test.openConnection();
connect.setDoOutput(true);
connect.setDoInput(true);
connect.setRequestMethod("POST");
new DataOutputStream(connect.getOutputStream ()).writeInt(clientno);//send int out
int newclientno = new DataInputStream(connect.getInputStream()).readInt();
System.out.println("Send from Server: " + newclientno);
//BufferedReader in = new BufferedReader(new InputStreamReader(connect.getInputStream()));
//String inputLine;
//System.out.println(clientnumber.createJsonNachricht().toString());
//while ((inputLine = in.readLine()) != null)
// System.out.println(inputLine);
//in.close();
}
}
我能夠將整數clinetno從客戶端發送到服務器,並在服務器上增加它。 但是我不知道如何將新的整數newclientno發送回客戶端並在控制台上顯示它。 有什么建議我做錯了嗎?
好的,我發現了自己的錯誤,我必須在服務器中添加標題以完成連接。 我已經有但沒有注意到它。
t.sendResponseHeaders(200, 0);
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