JAVA进阶-网络编程
2024-09-30 18:11:24
>通过套接字连接server
Socket指代套接字
>读取随意站点的首页
---------
/**
* @author Lean @date:2014-10-9
*/
public class SocketSample { public static void main(String[] args) {
BufferedWriter writer=null;
Socket socket=null;
try {
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
socket=new Socket("localhost",8080);
OutputStream outputStream=socket.getOutputStream();
outputStream.write("GET / HTTP/1.0\n\n".getBytes());
BufferedReader reader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
writer=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("C:/Users/Administrator/Desktop/TheadSample.html")));
String appendStr=null;
while ((appendStr=reader.readLine()) != null) {
// System.out.println(appendStr);
writer.write(appendStr);
}
writer.close();
reader.close();
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
if (socket!=null) {
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} } }
---------
>通过url下载随意网页
---------
/**
* @author Lean @date:2014-10-9
*/
public class URLSample { public static void main(String[] args) { try {
URL url=new URL("HTTP","www.baidu.com",80,"");
// URL url=new URL("http://www.baidu.com");
HttpURLConnection connection=(HttpURLConnection) url.openConnection();
connection.connect();
InputStream is=connection.getInputStream();
byte[] buff=new byte[1024];
int length=0;
while ((length=is.read(buff))!=-1) {
System.out.println(new String(buff));
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} } }
---------
>检測站点传入的cookie信息
---------
/**
* @author Lean @date:2014-10-9
*/
public class HttpCookieSample { /**
* @param args
*/
public static void main(String[] args) {
CookieManager manager=new CookieManager();
manager.setCookiePolicy(new CustomerPolicy());
CookieHandler.setDefault(manager);
try {
URL url=new URL("http://www.baidu.com");
URLConnection conn=url.openConnection();
Object content=conn.getContent();
List<HttpCookie> cookies=manager.getCookieStore().getCookies();
for (HttpCookie httpCookie : cookies) {
System.out.println(httpCookie.getName()+" "+httpCookie.getValue()+" "+httpCookie.getDomain());
printCookieLiveAge(httpCookie);
System.out.println("Cookie secured:"+httpCookie.getSecure());
System.out.println("..........."); }
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} } private static void printCookieLiveAge(HttpCookie httpCookie) {
long age=httpCookie.getMaxAge();
SimpleDateFormat df=new SimpleDateFormat("HH:mm:ss");
System.out.println(age!=-1?"Cookie will expire when close ":"Cookie age is:"+df.format(age));
} static class CustomerPolicy implements CookiePolicy{ @Override
public boolean shouldAccept(URI uri, HttpCookie cookie) {
return true;
} } }
---------
>编写同一时候服务多个client的server程序
---------
/**
* @author Lean @date:2014-10-9
*/
public class ServerSocketSample { private static ServerSocket server=null; public static void main(String[] args) { try {
server=new ServerSocket(8080);
ExecutorService pool=Executors.newFixedThreadPool(3);
while (true) {
Socket socketObject= server.accept();
pool.submit(new CustomRunnable(socketObject));
}
} catch (IOException e) {
e.printStackTrace();
}
} static class CustomRunnable implements Runnable{ byte[] buff=new byte[512];
private Socket socketObject;
public CustomRunnable(Socket socketObject) {
this.socketObject=socketObject;
} @Override
public void run() {
try {
System.out.println("Thread ID>>"+Thread.currentThread().getId());
InputStream stream=socketObject.getInputStream();
stream.read(buff);
OutputStream os=socketObject.getOutputStream();
os.write(buff);
socketObject.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} }
---------
>编写实际的文件存储server程序
---------
StorgeServerSample
/**
* @author Lean @date:2014-10-10
*/
public class StorgeServerSample { public static void main(String[] args) {
ServerSocket socket=null;
ExecutorService service=Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
try {
socket=new ServerSocket(8080);
try {
while (true) {
Socket socketObject=socket.accept();
service.submit(new RequestRunnable(socketObject));
}
} finally{
socket.close();
}
} catch (IOException e) {
e.printStackTrace();
} } static class RequestRunnable implements Runnable{ private Socket requestSocket; public RequestRunnable(Socket socketObject) {
requestSocket=socketObject;
} @Override
public void run() {
try {
DataInputStream dataIs=new DataInputStream(requestSocket.getInputStream());
DataOutputStream dataOs=new DataOutputStream(requestSocket.getOutputStream());
int cmd=dataIs.readInt();
String message=cmd==0? "Put ":"Get ";
String fileName=dataIs.readUTF();
message+=fileName+" REQUEST";
fileName="C:/Documents and Settings/Administrator/桌面/Server.txt";
if (cmd==0) {
uploadFile(dataIs,fileName);
}else {
downFile(dataOs,fileName);
}
} catch (IOException e) {
e.printStackTrace();
} } private void uploadFile(DataInputStream dataIs, String fileName) {
try {
BufferedWriter writer=new BufferedWriter(new FileWriter(fileName));
String tempStr;
while (!(tempStr=dataIs.readUTF()).equals("-1")) {
writer.write(tempStr);
writer.newLine();
}
writer.close();
dataIs.close();
} catch (IOException e) {
e.printStackTrace();
}
} private void downFile(DataOutputStream dataOs, String fileName) {
try {
BufferedReader reader=new BufferedReader(new FileReader(fileName));
String tempStr=null;
while ((tempStr=reader.readLine())!=null) {
dataOs.writeUTF(tempStr);
}
dataOs.writeUTF("-1");
dataOs.close();
reader.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} } }
---------
StorgeClientSample
public class StorgeClientSample {
public static void main(String[] args) {
int cmd=1;
try {
Socket requestScoket=new Socket();
requestScoket.connect(new InetSocketAddress("localhost",8080));
if (cmd==0) {
String fileName="C:/Documents and Settings/Administrator/桌面/Test.txt";
BufferedReader reader=new BufferedReader(new FileReader(fileName));
DataOutputStream dataOs=new DataOutputStream(requestScoket.getOutputStream());
dataOs.writeInt(cmd);
dataOs.writeUTF(fileName);
String tempStr;
while ((tempStr=reader.readLine())!=null) {
System.out.println(tempStr);
dataOs.writeUTF(tempStr);
}
dataOs.writeUTF("-1");
dataOs.close();
reader.close();
}else {
String fileName="C:/Documents and Settings/Administrator/桌面/Down.txt";
BufferedWriter writer=new BufferedWriter(new FileWriter(fileName));
DataOutputStream dataOs=new DataOutputStream(requestScoket.getOutputStream());
dataOs.writeInt(cmd);
dataOs.writeUTF(fileName);
DataInputStream dataIs=new DataInputStream(requestScoket.getInputStream());
String tempStr;
while (!(tempStr=dataIs.readUTF()).equalsIgnoreCase("-1")) {
System.out.println(tempStr);
writer.write(tempStr);
writer.newLine();
}
dataIs.close();
writer.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
---------
>创建多电波server和client
---------
StockTradesServer
/**
* @author Lean @date:2014-10-11
*/
public class StockTradesServer { public static void main(String[] args) {
Thread stockSThread=new Thread(new StockTradeGenerator());
stockSThread.setDaemon(true);
stockSThread.start();
try {
Thread.sleep(30000);
} catch (InterruptedException e) {
}
} static class StockTradeGenerator implements Runnable{ private DatagramSocket broadcastSocket;
private String[] stockSymbols ={"IBM","SNE","XRX","MHP","NOK"}; public StockTradeGenerator() {
try {
broadcastSocket=new DatagramSocket(4445);
} catch (SocketException e) {
System.out.println("error create socket ! ");
}
} @Override
public void run() {
byte[] buff=new byte[126];
try {
while (true) {
int index=(int) (Math.random()*5);
float trade=generatorRandomTrade(index);
String tempStr=String.format("%s %.2f@ %s",stockSymbols[index],trade,now());
buff=tempStr.getBytes();
InetAddress groupInetAddresses;
groupInetAddresses = InetAddress.getLocalHost();
DatagramPacket datagramPacket=new DatagramPacket(buff,buff.length, groupInetAddresses,4446);
broadcastSocket.send(datagramPacket);
Thread.sleep(500);
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}finally{
broadcastSocket.close();
}
} } public static float generatorRandomTrade(int index) {
float trade=(float) Math.random();
switch (index) {
case 0:
trade+=118;
break;
case 1:
trade+=29;
break;
case 2:
trade+=8;
break;
case 3:
trade+=26;
break;
case 4:
trade+=14;
break;
default:
break;
}
return trade;
} public static Object now() {
SimpleDateFormat df=new SimpleDateFormat("HH:mm:ss");
Date date=new Date();
return df.format(date);
} }
---------
StockTradeClient
/**
* @author Lean @date:2014-10-11
*/
public class StockTradeClient { public static void main(String[] args) throws IOException {
MulticastSocket multicastSocket=new MulticastSocket(4446);
InetAddress address=InetAddress.getByName("232.0.1.1");
multicastSocket.joinGroup(address);
for (int i = 0; i < 10; i++) {
byte[] buff=new byte[256];
DatagramPacket datagramPacket=new DatagramPacket(buff,buff.length);
multicastSocket.receive(datagramPacket);
System.out.println(new String(datagramPacket.getData(),0,datagramPacket.getLength()));
}
multicastSocket.leaveGroup(address);
multicastSocket.close();
} }
---------
网络基础知识(转)
Ip:提供了数据的发送地址和接收地址;位于网络层;
Tcp:三次握手,"带重定向的肯定确认"技术来实现传输可靠性,"滑动窗体"的流量控制
对Ip包进行解包,并对分解的tcp包进行排序,假设出错,即发出又一次请求的信号
Udp:面向无连接的传输数据协议,可当做广播处理,不监控包的顺序,速度快,easy产生丢包现象;
Icmp:为ip指出通向目标地址的路径信息.
通讯port:以源地址源port,目标地址目标port作为确定,并依靠传输层协议对每次传输进行确认
数据格式:帧头+IP数据包+帧尾（帧头包含源和目标主机MAC地址及类型，帧尾是校验字）
IP数据包：IP头部+TCP数据信息（IP头包含源和目标主机IP地址、类型、生存期等）
TCP数据信息：TCP头部+实际数据 (TCP头包含源和目标主机port号、顺序号、确认号、校验字等）
网络接口层:数据链路层是负责接收IP数据包并通过网络发送，
或者从网络上接收物理帧，抽出IP数据包，交给IP层。
网络层：装载和分解IP数据包 进行流控，地址转换，路径处理等等。
传输层：格式化数据流并检查错误。实现错误则又一次请求。
OSI/RM（开放系统互联/參考模型）
1) 物理层
对数据链路层提供物理介质连接，包含激活，维持，去活物理连接。
2) 数据链接层
传送以祯为单位的数据，并对容错，流控进行管理
3) 网络层
对网络提供建立维持终止等连接手段。最重要的是网络选路和寻址
4) 传输层
屏蔽下层控制细节，并实现可靠的传输数据机制来收发报文。
5) 会话层
进程间的通讯，管理两个会话进程间的通讯。
6) 表示层
将数据的抽象语法转化为传送语法。
对数据解压/加压等等。
7) 应用层
为用户应用进程訪问OSI提供接口,以满足用户的须要。
最新文章
- Android笔记——Matrix
- SQList
- 《Entity Framework 6 Recipes》中文翻译系列 (21) -----第四章 ASP.NET MVC中使用实体框架之在页面中创建查询和使用ASP.NET URL路由过虑
- .NET正则表达式基础入门（三）
- jira任务批量操作示例
- 四、解决MyEclipse控制台输出中文乱码的问题
- [php-src]窥探Php内核中的数组与面向对象
- Ionic 常见问题及解决方案
- scrollTop 鼠标往下移动到一定位置显示隐藏
- textViewDidChange: crashes in iOS 7
- 【CodeForces 504A】Misha and Forest
- Oracle新建数据库（新用户）
- Centos7.5 搭建Red5视频直播服务器
- How to force to Fullscreen Form
- win10系统下安装TensorFlow GPU版本
- OKL4虚拟化技术跟踪
- Django 框架初步了解
- pycaffe简明文档
- [No0000F0]DataGrid一行Row添加ToolTip，wpf
- css笔记 - 张鑫旭css课程笔记之 margin 篇