下面贴代码，一个是server,一个是client
client:
package testClient;
import java.net.Socket;
import java.util.*;
import java.io.*;
public class Client {
public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
String str=null;
Socket client=new Socket("localhost",8819);
Scanner scan=new Scanner(client.getInputStream());
PrintWriter p=new PrintWriter(client.getOutputStream(),true);
Scanner scan2=new Scanner(new InputStreamReader(System.in));
scan2.useDelimiter("\n");
System.out.println("请输入要发送给服务端的字符串");
if(scan2.hasNext()) str=scan2.next().toString();
p.println(str);
client.shutdownOutput();
while(!scan.hasNext());
System.out.println(scan.next().toString());
}
}
下面是server:
package testServer;
import java.net.*;
import java.util.*;
import java.io.*;
public class server {
public static void main(String[] args) throws Exception{
// TODO Auto-generated method stub
String str=null;
ServerSocket s=new ServerSocket(8819);
System.out.println("已就绪，等待连接");
Scanner scan=new Scanner(new InputStreamReader(System.in));
Socket c=s.accept();
System.out.println("已连接上");
Scanner scan2=new Scanner(c.getInputStream());
scan2.useDelimiter("\n");
str=scan2.next();
if(str.equals(" hello world"))
{
PrintWriter w=new PrintWriter(c.getOutputStream());
w.println("已收到");
c.shutdownOutput();
}else
{
System.out.println("收到的字符串不正确");
System.out.println(str);
}
c.close();
}
}
下面贴张输出结果的图：
请问是怎么回事？输出的字符串已说明接收到的str就是“hello world",但是str.equals("hello world")的结果却为false，请问这是怎么回事？
