1.
获取网络请求权限
2.urlConnection和Okhttp请求组装
package cn.fc.networktest;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import okhttp3.OkHttpClient;
import okhttp3.Request;
public class HttpUtil {
public static void sendHttpRequest(final String address, final HttpCallbackListener listener){
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
try{
URL url = new URL(address);
connection = (HttpURLConnection)url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
connection.setDoInput(true);
connection.setDoOutput(true);
InputStream in = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null){
response.append(line);
}
listener.onFinish(response.toString());
} catch (Exception e){
listener.onError(e);
} finally {
if (connection != null){
connection.disconnect();
}
}
}
}).start();
}
public static void sendOkHttpRequest(String address, okhttp3.Callback callback){
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder().url(address).build();
client.newCall(request).enqueue(callback);
}
}
3.在activity使用网络请求
package cn.fc.networktest;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
TextView responseText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button sendRequest = (Button)findViewById(R.id.send_request);
responseText = (TextView)findViewById(R.id.response_text);
sendRequest.setOnClickListener(this);
}
@Override
public void onClick(View v){
if(v.getId() == R.id.send_request){
// 使用HttpURLConnection 请求
// sendRequestWithHttpURLConnection();
// 使用httpclient请求
sendRequestWithOjhttp();
}
}
private void sendRequestWithHttpURLConnection(){
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
BufferedReader reader = null;
try{
URL url = new URL("https://www.baidu.com");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
InputStream in = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null){
response.append(line);
}
showResponse(response.toString());
} catch (Exception e){
e.printStackTrace();
} finally {
if (reader != null){
try {
reader.close();
} catch (Exception e) {
e.printStackTrace();
}
if (connection != null){
connection.disconnect();
}
}
}
}
}).start();
}
private void sendRequestWithOjhttp(){
new Thread(new Runnable() {
@Override
public void run() {
try{
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("http://www.baidu.com")
.build();
Response response = client.newCall(request).execute();
String responseData = response.body().string();
showResponse(responseData);
} catch (Exception e){
e.printStackTrace();
}
}
}).start();
}
private void showResponse(final String response){
// 目的是为了切回主线程
runOnUiThread(new Runnable() {
@Override
public void run() {
responseText.setText(response);
}
});
}
}
注意开通手机网络请求权限