1.首先什么是HttoURLConnection,看它名字就知道和Http协议有关,我们都知道如果我们的app要嵌入一个搜索网站,只需要一个webview即可,其实webview是一个封装好的Http,并且还帮我们解释了一系列的html,而HttoURLConnection则是一个裸的Http,可以让我们更直观的理解http协议,其实http协议也就是向服务器发送一条请求,然后服务器再返回一系列的Html而已,在这个过程中我还学到一个BufferedReader读取字符串的神器= =(萌新)。
package com.example.gdzc.networktest;
import android.support.v7.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.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button=(Button)findViewById(R.id.button);
textView=(TextView)findViewById(R.id.response);
button.setOnClickListener(this);
}
public void onClick(View view)
{
if(view.getId()==R.id.button)
{
sendRequest();
}
}
private void sendRequest()//发送请求
{
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 (IOException e)
{
e.printStackTrace();
}
}
if(connection!=null)
{
connection.disconnect();
}
}
}
}
}).start();
}
private void showResponse(final String response)
{
runOnUiThread(new Runnable() {
@Override
public void run() {
textView.setText(response);
}
});
}
}
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