网络编程小实例
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//// TCP编程1：客户端给服务端发送信息。服务端输出此信息到控制台上
// 网络编程实际上就是Socket的编程
@Test
public void client1() {
// 1.创建一个Socket对象，指明ip地址和端口号
Socket socket = null;
// 2.通过socket.getOutputStream来创建一个outputstream的对象
OutputStream os = null;
try {
socket = new Socket(InetAddress.getByName("127.0.0.1"), 9898);
os = socket.getOutputStream();
// 3.利用os.write(),把要传输的内容写出去
String str = "你好，我是客户端";
byte[] b = str.getBytes();
os.write(b);
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
// 4.关闭相应的流
if (os != null) {
try {
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
@Test
public void server1() {
// 1.创建ServerSocket的对象来和客户端的接口建立连接
ServerSocket ss = null;
// 2.创建Socket对象来接收客户端发送的消息
Socket s = null;
// 3.创建输入流来读取
InputStream is = null;
try {
ss = new ServerSocket(9898);
s = ss.accept();
is = s.getInputStream();
// 4.读取的具体过程
byte[] b = new byte[20];
int len;
while ((len = is.read(b)) != -1) {
System.out.println(new String(b, 0, len));
}
System.out.println(
"接收到来自于" + s.getInetAddress().getHostAddress() + "的信息");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 5.关闭流
finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (s != null) {
try {
s.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (ss != null) {
try {
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
// TCP编程2：
// 客户端给服务端发送信息，服务端将信息打印到控制台上，同时发送“已收到信息”给客户端
@Test
public void client2() {
Socket socket = null;
OutputStream os = null;
InputStream is = null;
try {
socket = new Socket(InetAddress.getLocalHost(), 9898);
os = socket.getOutputStream();
os.write("小贝呀，是不是又偷吃糖葫芦了？".getBytes());
socket.shutdownOutput();
is = socket.getInputStream();
byte[] b = new byte[20];
int len;
while((len = is.read(b)) != -1){
System.out.print(new String(b,0,len));
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(is != null){
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(os != null){
try {
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(socket != null){
try {
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
@Test
public void server2() {
ServerSocket ss = null;
Socket s = null;
InputStream is = null;
OutputStream os = null;
try {
ss = new ServerSocket(9898);
s = ss.accept();
is = s.getInputStream();
byte[] b = new byte[20];
int len;
while ((len = is.read(b)) != -1) {
System.out.print(new String(b, 0, len));
}
System.out
.println("接收到来自" + s.getInetAddress().getHostAddress() + "的信息");
os = s.getOutputStream();
os.write("没有啊！！！不信你问我嫂子".getBytes());
os.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(os != null){
try {
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(is != null){
try {
is.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(s != null){
try {
s.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(ss != null){
try {
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
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