用户端:
InputStream is = client.getInputStream();
InputStreamReader isr=new InputStreamReader(is);
BufferedReader br=new BufferedReader(isr);//输入
OutputStream os = client.getOutputStream();
PrintWriter print=new PrintWriter(os);//输出
System.out.println(br.readLine());//输入:L登录;R注册;Q退出程序
print.write(s.next());//用户输入选择后发给服务端
print.close();
System.out.println(br.readLine());//请输入用户名
print.write(s.next());//用户名发给服务端
print.close();
System.out.println(br.readLine());//请输入密码
print.write(s.next());//密码发给服务端
print.close();
服务端
InputStream is = client.getInputStream();
InputStreamReader isr=new InputStreamReader(is);
BufferedReader br=new BufferedReader(isr);//输入
OutputStream os = client.getOutputStream();
PrintWriter print=new PrintWriter(os);//输出
System.out.println("开始交互");
print.write("输入:L登录;R注册;Q退出程序");
print.close();
String cho = br.readLine();
System.out.println(cho);
switch(cho) {
case "L":
print.write("请输入用户名:");
print.close();
String userName = br.readLine();
print.write("请输入密码:");
print.close();
String password = br.readLine();
break;
提示后,输入L后显示null,然后阻塞