chapter03 EchoClient br.read() and pw.write(100); success send date by socket, but
only send int.

log:
ckt@ckt-desktop:~/work/src_51cto_java_network/chapter03/bin$ java Server
server launch
New connection accepted /127.0.0.1:45257
pw.write(100);
pw.write(200);
pw.write(300);
close socket

ckt@ckt-desktop:~/work/src_51cto_java_network/chapter03/bin$ java
EchoClient
br.read():100
br.read():200
br.read():300
br.read():-1