我有两个从客户端到服务器的HttpURLConnections。这不是典型的HttpServer，我在编码客户端和服务器，但只能使用端口80/443（用于测试任何端口的工作）。第一个请求通过正常，但第二个请求（在第一个请求后立即发生）无法到达服务器。我正在调用HttpExchange.close和HttpURLConnection.disconnect并刷新所有流，但我无法获得第二个请求到达服务器。我正在使用Oracle的JDK 1.7_17 x64并在Win7 x64上运行。以下是SSCCE的输出和SSCCE。我错过了什么!! ??
服务器
Started server @ /127.0.0.1:8765
Handling HttpExchange!
Processing request from user: joe.smith
客户端：
ClientID: 0
Response code: 200
这是SSCCE：
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.URL;
import javax.swing.JOptionPane;
public class CommsTest {
public static void main(String[] args) throws IOException {
Object startMe = JOptionPane.showInputDialog(null, "Start client or server?", "Launcher", JOptionPane.QUESTION_MESSAGE, null,
new Object[]{"Client", "Server"}, "Server");
if (startMe.equals("Server")) {
HttpServer httpServer = HttpServer.create(new InetSocketAddress("localhost", 8765), 50000);
httpServer.createContext("/test", new HttpHandler() {
private byte clientIdCounter = 0;
@Override
public void handle(HttpExchange he) throws IOException {
System.out.println("Handling HttpExchange!");
int requestCode = Integer.parseInt(he.getRequestHeaders().getFirst("ReqCode"));
switch (requestCode) {
case 0:
// request '0' sends username and accepts a byte back
try (ObjectInputStream ois = new ObjectInputStream(he.getRequestBody())) {
System.out.println("Processing request from user: " + ois.readUTF());
}
// send a response of code of 200, all is well! and i'm sending 1 byte back.
he.sendResponseHeaders(200, 1);
he.getResponseBody().write(new byte[]{clientIdCounter++});
he.close();
break;
case 1:
// request '1' sends 3 bytes
try (ObjectInputStream ois = new ObjectInputStream(he.getRequestBody())) {
byte clientId = ois.readByte();
byte opCode = ois.readByte();
byte argument = ois.readByte();
System.out.println(String.format("Received op request %d from client %d with argument %d", clientId, opCode,
argument));
// send a response code of 200, all is well! no data is being sent back though.
he.sendResponseHeaders(200, 0);
he.close();
}
break;
}
}
});
httpServer.start();
System.out.println("Started server @ "+ httpServer.getAddress());
} else if (startMe.equals("Client")) {
// first phase of the connection, send a opCode of 0, send the username, receive the client id
HttpURLConnection con = create(true, true, 0);
try (ObjectOutputStream oos = new ObjectOutputStream(con.getOutputStream())) {
oos.writeUTF(System.getProperty("user.name"));
}
byte clientId = (byte) con.getInputStream().read();
System.out.println("ClientID: " + clientId);
System.out.println("Response code: "+ con.getResponseCode());
con.disconnect();
// next phase of connection, send an opCode of 1 and 3 bytes, receive nothing
con = create(false, true, 0);
try (ObjectOutputStream oos = new ObjectOutputStream(con.getOutputStream())) {
oos.writeByte(0);
oos.writeByte(4);
oos.writeByte(2);
oos.flush(); //I've also tried closing the oos manually and calling con.disconnect, to no avail
}
}
}
private static HttpURLConnection create(boolean input, boolean output, int reqCode) throws IOException {
URL url = new URL("http://localhost:8765/test");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setUseCaches(false);
//I have tried #setRequestMethod("POST") but that didn't help
con.setDoInput(input);
con.setDoOutput(output);
con.setRequestProperty("ReqCode", Integer.toString(reqCode));
return con;
}
}
答案 0 :(得分：1)
这是清理工作的SSCCE！如果有人有任何进一步的建议，特别是任何会加快客户端 - 服务器交互的事情，请告诉我。我知道我的客户端少于20个，只有一台服务器。来自佛罗里达的欢呼！
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.Executors;
import javax.swing.JOptionPane;
public class CommsTest2 {
/**
* Starts a server or a client (depending on UI input). The server listens on http://localhost:8765/test/register and
* http://localhost:8765/test/registerFor. The server sends back a clientID on registration and accepts 3 bytes on 'registerFor'. In
* all cases the server sends back a 200/OK status code if all goes well.
*/
public static void main(String[] args) throws IOException, InterruptedException {
Object startMe = JOptionPane.showInputDialog(null, "Start client or server?", "Launcher", JOptionPane.QUESTION_MESSAGE, null,
new Object[]{"Client", "Server"}, "Server");
if (startMe.equals("Server")) {
HttpServer httpServer = HttpServer.create(new InetSocketAddress("localhost", 8765), 50000);
httpServer.setExecutor(Executors.newFixedThreadPool(20));
httpServer.createContext("/test/" + Op.REGISTER.urlOpPath, new HttpHandler() {
private byte clientIdCounter = 0;
@Override
public void handle(HttpExchange he) throws IOException {
System.out.println("Handling 'register' HttpExchange");
// 'register' sends username and accepts a byte back (the client ID)
try (ObjectInputStream ois = new ObjectInputStream(he.getRequestBody())) {
System.out.println("Processing request from user: " + ois.readUTF());
}
// send a response of code of 200, all is well! and i'm sending 1 byte back, which is the client id
he.sendResponseHeaders(200, 1);
he.getResponseBody().write(new byte[]{clientIdCounter++});
he.close();
System.out.println("Registration complete!");
}
});
httpServer.createContext("/test/" + Op.REGISTER_FOR.urlOpPath, new HttpHandler() {
@Override
public void handle(HttpExchange he) throws IOException {
System.out.println("Handling 'registerFor' HttpExchange");
// request '1' sends 3 bytes
try (ObjectInputStream ois = new ObjectInputStream(he.getRequestBody())) {
byte clientId = ois.readByte();
byte opCode = ois.readByte();
byte argument = ois.readByte();
System.out.println(String.format("Received op request %d from client %d with argument %d", clientId, opCode,
argument));
// send a response code of 200, all is well! no data is being sent back though.
he.sendResponseHeaders(200, 0);
}
he.close();
System.out.println("Register-For complete!");
}
});
httpServer.start();
System.out.println("Started server @ " + httpServer.getAddress());
} else if (startMe.equals("Client")) {
// first phase of the connection, send a opCode of 0, send the username, receive the client id
{
HttpURLConnection con = create(Op.REGISTER);
try (ObjectOutputStream oos = new ObjectOutputStream(con.getOutputStream())) {
oos.writeUTF(System.getProperty("user.name"));
}
byte clientId = (byte) con.getInputStream().read();
System.out.println("Received ClientID: " + clientId + " and response code: " + con.getResponseCode());
con.disconnect();
}
// next phase of connection, send an opCode of 1 and 3 bytes, receive nothing
{
HttpURLConnection con = create(Op.REGISTER_FOR);
try (ObjectOutputStream oos = new ObjectOutputStream(con.getOutputStream())) {
oos.writeByte(0);
oos.writeByte(4);
oos.writeByte(2);
}
System.out.println("Received response code: " + con.getResponseCode());
con.disconnect();
}
System.out.println("Done sending!");
}
}
private static HttpURLConnection create(Op op) throws IOException {
HttpURLConnection con = (HttpURLConnection) op.url.openConnection();
con.setUseCaches(false);
con.setDoInput(op.input);
con.setDoOutput(op.output);
return con;
}
private enum Op {
REGISTER(true, true, "register"),
REGISTER_FOR(true, true, "registerFor");
private final boolean input, output;
private final String urlOpPath;
private final URL url;
private Op(boolean input, boolean output, String opPath) {
this.input = input;
this.output = output;
this.urlOpPath = opPath;
try {
this.url = new URL("http://localhost:8765/test/" + opPath);
} catch (MalformedURLException ex) {
throw new RuntimeException(ex);
}
}
}
}