我有一个用 C 编写的服务器应用程序:
int main(int argc, char const *argv[]) {
int sock;
struct sockaddr_un serv_addr;
size_t serv_addr_len;
int msgsock;
char buf[1024];
int msg_len;
remove(SOCKET_ADDRESS);
sock = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (sock < 0) {
perror("Opening stream socket");
exit(1);
}
memset(&serv_addr, 0, sizeof(serv_addr));
serv_addr.sun_family = AF_UNIX;
strcpy(serv_addr.sun_path, SOCKET_ADDRESS);
serv_addr_len = strlen(serv_addr.sun_path) + sizeof(serv_addr.sun_family);
if (bind(sock, (struct sockaddr *) &serv_addr, serv_addr_len)) {
perror("Binding stream socket");
exit(1);
}
if (listen(sock, 5) < 0) {
perror("Listening falied");
exit(1);
}
while (TRUE) {
msgsock = accept(sock, (struct sockaddr *) 0, 0);
if (msgsock == -1) {
perror("Accept");
}
else {
do {
memset(buf, 0, sizeof(buf));
if ((msg_len = recv(msgsock, buf, sizeof(buf), MSG_WAITALL)) < 0) {
perror("Reading stream message");
}
else if (msg_len == 0) {
printf("Ending connection\n");
}
else {
printf("%s\n", buf);
}
} while (msg_len > 0);
close(msgsock);
}
}
return 0;
}
并让一个客户端使用 junixsocket lib 在 Java 上编写:
package client;
import java.io.*;
import org.newsclub.net.unix.AFUNIXSocket;
import org.newsclub.net.unix.AFUNIXSocketAddress;
public class Client {
public static void main(String args[]) {
final String socketAddress = "/home/andrew/IdeaProjects/Sample/tmp/SOCKET_ADDRESS";
String message = "Hello Server!";
try {
final File socketFile = new File(socketAddress);
AFUNIXSocket socket = AFUNIXSocket.newInstance();
socket.connect(new AFUNIXSocketAddress(socketFile));
OutputStream out = socket.getOutputStream();
out.write(message.getBytes());
out.flush();
socket.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
我启动了服务器,并尝试连接,然后出现异常:
/usr/lib/jvm/java-1.8.0-openjdk-amd64/bin/java -Didea.launcher.port=7533 -Didea.launcher.bin.path=/home/andrew/Downloads/idea-IU-163.7743.44/bin -Dfile.encoding=UTF-8 -classpath /usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/charsets.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/cldrdata.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/dnsns.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/icedtea-sound.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/jaccess.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/localedata.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/nashorn.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunec.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunjce_provider.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/sunpkcs11.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/ext/zipfs.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/jce.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/jsse.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/management-agent.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/resources.jar:/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/rt.jar:/home/andrew/IdeaProjects/Sample/out/production/Sample:/home/andrew/Workspace/libs/junixsocket-1.3.jar:/home/andrew/Workspace/libs/junixsocket-demo-1.3.jar:/home/andrew/Workspace/libs/junixsocket-mysql-1.3.jar:/home/andrew/Workspace/libs/junixsocket-rmi-1.3.jar:/home/andrew/Downloads/idea-IU-163.7743.44/lib/idea_rt.jar com.intellij.rt.execution.application.AppMain client.Client org.newsclub.net.unix.AFUNIXSocketException: Protocol wrong type for socket (socket: /home/andrew/IdeaProjects/Sample/tmp/SOCKET_ADDRESS) at org.newsclub.net.unix.NativeUnixSocket.connect(Native Method) at org.newsclub.net.unix.AFUNIXSocketImpl.connect(AFUNIXSocketImpl.java:125) at org.newsclub.net.unix.AFUNIXSocket.connect(AFUNIXSocket.java:97) at org.newsclub.net.unix.AFUNIXSocket.connect(AFUNIXSocket.java:87) at client.Client.main(Client.java:19) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
请帮帮我!
最佳答案
unix 域套接字是一种特定于平台的机制,没有 native 库的 java 不支持它。您使用 org.newsclub.net.unix.AFUNIXSocket
。但是这个库只支持套接字类型 SOCK_STREAM
和 SOCK_DGRAM
。您的 C 应用程序使用 SOCK_SEQPACKET
,它是 unix 域套接字的 linux 特定扩展,不受此库支持。
关于java - 是否可以使用 Unix 套接字在 C 应用程序和 Java 应用程序之间创建通信?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/40843847/