public class ReceiveDemo {
public static void main(String[] args) throws IOException {
//创建接收端的Socket对象(DatagramSocket)
DatagramSocket ds = new DatagramSocket(10086);
while (true) {
//创建一个数据包，用于接收数据
byte[] bys = new byte[1024];
DatagramPacket dp = new DatagramPacket(bys, bys.length);
```java
public class ClientDemo {
public static void main(String[] args) throws IOException {
//创建客户端的Socket对象(Socket)
//Socket(String host, int port) 创建流套接字并将其连接到指定主机上的指定端口号
Socket s = new Socket("192.168.1.66",10000);
//获取输出流，写数据
//OutputStream getOutputStream() 返回此套接字的输出流
OutputStream os = s.getOutputStream();
os.write("hello,tcp,我来了".getBytes());
```java
public class ServerDemo {
public static void main(String[] args) throws IOException {
//创建服务器端的Socket对象(ServerSocket)
//ServerSocket(int port) 创建绑定到指定端口的服务器套接字
ServerSocket ss = new ServerSocket(10000);
//Socket accept() 侦听要连接到此套接字并接受它
Socket s = ss.accept();
//获取输入流，读数据，并把数据显示在控制台
InputStream is = s.getInputStream();
byte[] bys = new byte[1024];
int len = is.read(bys);
String data = new String(bys,0,len);
System.out.println("数据是：" + data);
- 代码实现
```java
public class ServerDemo {
public static void main(String[] args) throws IOException {
//创建服务器端的Socket对象(ServerSocket)
ServerSocket ss = new ServerSocket(10000);
//监听客户端连接，返回一个Socket对象
Socket s = ss.accept();
//获取输入流，读数据，并把数据显示在控制台
InputStream is = s.getInputStream();
byte[] bys = new byte[1024];
int len = is.read(bys);
String data = new String(bys, 0, len);
System.out.println("服务器：" + data);
//给出反馈
OutputStream os = s.getOutputStream();
os.write("数据已经收到".getBytes());
//释放资源
// s.close();
ss.close();
}
}
public class ClientDemo {
public static void main(String[] args) throws IOException {
//创建客户端的Socket对象(Socket)
Socket s = new Socket("192.168.1.66", 10000);
//获取输出流，写数据
OutputStream os = s.getOutputStream();
os.write("hello,tcp,我来了".getBytes());
//接收服务器反馈
InputStream is = s.getInputStream();
byte[] bys = new byte[1024];
int len = is.read(bys);
String data = new String(bys, 0, len);
System.out.println("客户端：" + data);
```java
public class ClientDemo {
public static void main(String[] args) throws IOException {
//创建客户端Socket对象
Socket s = new Socket("192.168.1.66",10000);
//数据来自于键盘录入，直到输入的数据是886，发送数据结束
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
//封装输出流对象
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String line;
while ((line=br.readLine())!=null) {
if("886".equals(line)) {
break;
}
```java
ublic class ClientDemo {
public static void main(String[] args) throws IOException {
//创建客户端Socket对象
Socket s = new Socket("192.168.1.66",10000);
//数据来自于键盘录入，直到输入的数据是886，发送数据结束
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
//封装输出流对象
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String line;
while ((line=br.readLine())!=null) {
if("886".equals(line)) {
break;
}
bw.write(line);
bw.newLine();
bw.flush();
}
//释放资源
s.close();
}
}
public class ServerDemo {
public static void main(String[] args) throws IOException {
//创建服务器Socket对象
ServerSocket ss = new ServerSocket(10000);
//监听客户端连接，返回一个对应的Socket对象
Socket s = ss.accept();
//接收数据
BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
//把数据写入文本文件
BufferedWriter bw = new BufferedWriter(new FileWriter("myNet\\s.txt"));
String line;
while ((line=br.readLine())!=null) {
bw.write(line);
bw.newLine();
bw.flush();
}
```java
public class ClientDemo {
public static void main(String[] args) throws IOException {
//创建客户端Socket对象
Socket s = new Socket("192.168.1.66",10000);
//封装文本文件的数据
BufferedReader br = new BufferedReader(new FileReader("myNet\\InetAddressDemo.java"));
//封装输出流写数据
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String line;
while ((line=br.readLine())!=null) {
bw.write(line);
bw.newLine();
bw.flush();
}
//释放资源
br.close();
s.close();
}
}
public class ServerDemo {
public static void main(String[] args) throws IOException {
//创建服务器Socket对象
ServerSocket ss = new ServerSocket(10000);
//监听客户端连接，返回一个对应的Socket对象
Socket s = ss.accept();
//接收数据
BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
//把数据写入文本文件
BufferedWriter bw = new BufferedWriter(new FileWriter("myNet\\Copy.java"));
String line;
while ((line=br.readLine())!=null) {
bw.write(line);
bw.newLine();
bw.flush();
}
```java
public class ClientDemo {
public static void main(String[] args) throws IOException {
//创建客户端Socket对象
Socket s = new Socket("192.168.1.66",10000);
//封装文本文件的数据
BufferedReader br = new BufferedReader(new FileReader("myNet\\InetAddressDemo.java"));
//封装输出流写数据
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String line;
while ((line=br.readLine())!=null) {
bw.write(line);
bw.newLine();
bw.flush();
}
```java
public class ClientDemo {
public static void main(String[] args) throws IOException {
//创建客户端Socket对象
Socket s = new Socket("192.168.1.66",10000);
//封装文本文件的数据
BufferedReader br = new BufferedReader(new FileReader("myNet\\InetAddressDemo.java"));
//封装输出流写数据
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String line;
while ((line=br.readLine())!=null) {
bw.write(line);
bw.newLine();
bw.flush();
}
s.shutdownOutput();
//接收反馈
BufferedReader brClient = new BufferedReader(new InputStreamReader(s.getInputStream()));
String data = brClient.readLine(); //等待读取数据
System.out.println("服务器的反馈：" + data);
//释放资源
br.close();
s.close();
}
}
public class ServerThread implements Runnable {
private Socket s;
public ServerThread(Socket s) {
this.s = s;
}
@Override
public void run() {
try {
//接收数据写到文本文件
BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
//解决名称冲突问题
int count = 0;
File file = new File("myNet\\Copy["+count+"].java");
while (file.exists()) {
count++;
file = new File("myNet\\Copy["+count+"].java");
}
BufferedWriter bw = new BufferedWriter(new FileWriter(file));
String line;
while ((line=br.readLine())!=null) {
bw.write(line);
bw.newLine();
bw.flush();
}
//给出反馈
BufferedWriter bwServer = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
bwServer.write("文件上传成功");
bwServer.newLine();
bwServer.flush();
- Bootstrap class loader：它是虚拟机的内置类加载器，通常表示为null ，并且没有父null
- Platform class loader：平台类加载器可以看到所有平台类 ，平台类包括由平台类加载器或其祖先定义的Java SE平台API，其实现类和JDK特定的运行时类
- System class loader：它也被称为应用程序类加载器 ，与平台类加载器不同。 系统类加载器通常用于定义应用程序类路径，模块路径和JDK特定工具上的类
- 类加载器的继承关系：System的父加载器为Platform，而Platform的父加载器为Bootstrap
```java
public class ClassLoaderDemo {
public static void main(String[] args) {
//static ClassLoader getSystemClassLoader()：返回用于委派的系统类加载器
ClassLoader c = ClassLoader.getSystemClassLoader();
System.out.println(c); //AppClassLoader