网络访问的HTTP、TCP/IP、UDP协议详解

OkHttp的使用

static class RequestThread implements Runnable{

private String requestPath;

public RequestThread(String requestPath){

this.requestPath = requestPath;

}

@Override

public void run() {

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build() ;

StrictMode. setThreadPolicy (policy) ;

//1.创建OkHttp请求客户端

OkHttpClient client = new OkHttpClient();

//2.创建请求构造者对象

Builder builder = new Builder();

//2.1 指定请求路径

builder.url(path);

//2.2 指定请求方式

builder.get();

//3.通过构建者Builder对象创建Http请求对象

Request request = builder.build();

try {

//4.Call 客户端将请求对象封装成任务（Call）,再执行请求动作，并获取响应对象

Response response = client.newCall(request).execute();

//5.判断响应是否成功

if(response.isSuccessful()){

//6.获取响应体

ResponseBody body = response.body();

//获取数据

String result = body.string();

System.out.println(result);

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

//获取本地主机
InetAddress ia = InetAddress.getLocalHost();
System.out.println("主机名："+ia.getHostName()+" 主机地址:"+ia.getHostAddress());
//获取网络主机
InetAddress ia1 = InetAddress.getByName("www.baidu.com");
System.out.println("百度主机名："+ia1.getHostName()+" 百度主机地址:"+ia1.getHostAddress());

//获取局域网主机 如果拿不到主机名，通常返回Ip地址
InetAddress ia2 = InetAddress.getByName("10.10.159.22");
System.out.println("局域网主机名："+ia2.getHostName()+" 局域网主机地址:"+ia2.getHostAddress());

InetAddress[] ias = InetAddress.getAllByName("www.163.com");
//一个域名可以对应多个Ip(比如一台主机挂了，另一台也可以正常运行)，但是一个Ip只能对应一个域名
for(InetAddress ia3:ias){
System.out.println("163主机名："+ia3.getHostName()+" 163主机地址:"+ia3.getHostAddress());
}