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传统同步阻塞模型开发中,ServerSocket负责绑定IP,启动监听端口,意思就是说listen阶段就可以连接了
TimeServer 源码分析
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
/**
* Created by zzy on 18-10-16.
*/
public class TimeServer {
public static void main(String[] args){
int port=9001;
if(args!=null&&args.length>0){
port=Integer.parseInt(args[0]);
}
ServerSocket server=null;
try {
server=new ServerSocket(port);
System.out.println("The time Server is start in port: "+port);
Socket socket=null;
while(true){
socket=server.accept();
new Thread(new TimeServerHandler(socket)).start();
}
} catch (IOException e) {
e.printStackTrace();
}finally {
if(server!=null){
System.out.println("The time server close");
try {
server.close();
} catch (IOException e) {
e.printStackTrace();
}
server=null;
}
}
}
}
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Date;
/**
* Created by zzy on 18-10-16.
*/
public class TimeServerHandler implements Runnable {
private Socket socket;
public TimeServerHandler(Socket socket){
this.socket=socket;
}
@Override
public void run() {
BufferedReader in=null;
PrintWriter out=null;
try {
in=new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
out=new PrintWriter(this.socket.getOutputStream(),true);
String currentTime=null;
String body=null;
while((body=in.readLine())!=null){
if(body.equalsIgnoreCase("Query Time Order")){
currentTime=new Date(System.currentTimeMillis()).toString();
}else{
currentTime="BAD ORDER";
}
}
} catch (IOException e) {
e.printStackTrace();
if(in!=null){
try {
in.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if(out!=null){
out.close();
out=null;
}
if(this.socket!=null){
try {
this.socket.close();
} catch (IOException e1) {
e1.printStackTrace();
}
this.socket=null;
}
}
}
}
可以看到try catch finally 关闭资源比较繁琐。
利用java7开始带的try with resource statement
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Date;
/**
* Created by zzy on 18-10-16.
*/
public class TimeServerHandler implements Runnable {
private Socket socket;
public TimeServerHandler(Socket socket){
this.socket=socket;
}
@Override
public void run() {
BufferedReader in=null;
PrintWriter out=null;
try {
in=new BufferedReader(new InputStreamReader(this.socket.getInputStream()));
out=new PrintWriter(this.socket.getOutputStream(),true);
String currentTime=null;
String body=null;
while((body=in.readLine())!=null){
if(body.equalsIgnoreCase("Query Time Order")){
currentTime=new Date(System.currentTimeMillis()).toString();
}else{
currentTime="BAD ORDER";
}
System.out.println("The time server receiver is: "+body);
out.println(currentTime);
}
} catch (IOException e) {
e.printStackTrace();
if(in!=null){
try {
in.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if(out!=null){
out.close();
out=null;
}
if(this.socket!=null){
try {
this.socket.close();
} catch (IOException e1) {
e1.printStackTrace();
}
this.socket=null;
}
}
}
}