我要评论一、tomcat
服务端
-
自定义 s
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tomcat服务器 s ：java后台开发
客户端
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自定义 c
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浏览器 b
认识一些常用的目录：
-
bin：存放开始和结束的程序
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conf：配置文件
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lib：组成包
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logs：输出日志
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webapps：网页内容
二、udp
发短信：不用连接，需要知道对方的地址
//还是要等待客户端的连接
public class udpserverdemo01 {
public static void main(string[] args) throws exception {
//开放端口
datagramsocket socket = new datagramsocket(9090);
//接收数据包
byte[] bytes = new byte[1024];
datagrampacket packet = new datagrampacket(bytes, 0, bytes.length);//接收
socket.receive(packet);
system.out.println(packet.getaddress().gethostaddress());
system.out.println(new string(packet.getdata(),0,packet.getlength()));
//关闭连接
socket.close();
}
}
//不需要连接服务器
public class udpclientdemo01 {
public static void main(string[] args) throws exception {
//1.建立一个socket
datagramsocket socket = new datagramsocket();
//2.建个包
string msg ="你好啊服务器";
//发送给谁
inetaddress localhost = inetaddress.getbyname("localhost");
int port = 9090;
//数据，数据的长度起始，要发送给谁
datagrampacket packet = new datagrampacket(msg.getbytes(), 0, msg.getbytes().length, localhost, port);
//3.发送包
socket.send(packet);
//4.关闭流
socket.close();
}
}
三、url
统一资源定位符：定位资源的，定位互联网上的某一个资源
dns域名解析 www.baidu.com xxx.x..x..x
协议://ip地址: 端口/项目名/目录
public class urldemo01 {
public static void main(string[] args) throws malformedurlexception {
url url = new url("http://localhost:8080/helloworld/index.jsp?username=kuangshen&password=123");
system.out.println(url.getprotocol());//协议
system.out.println(url.gethost());//主机ip
system.out.println(url.getport());//端口
system.out.println(url.getpath());//全路径
system.out.println(url.getfile());//文件
system.out.println(url.getquery());//参数
try {
httpsurlconnection urlconnection = (httpsurlconnection) url.openconnection();
inputstream inputstream = urlconnection.getinputstream();
} catch (ioexception e) {
throw new runtimeexception(e);
}
}
}
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