Android中访问网络用的是HttpClient的方式，即Apache提供的一个jar包。安卓中继承了改jar包，所以安卓adt中不需要专门import该jar，直接就可以使用。
以下是MainActivity.java代码：
package com.wyl.httptest2;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;public class MainActivity extends ActionBarActivity {
Button btn;
EditText et;@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button)findViewById(R.id.btnId);
MyOnclickListener l = new MyOnclickListener();
et = (EditText)findViewById(R.id.editTextId);
btn.setOnClickListener(l);//绑定监听器
}class MyOnclickListener implements OnClickListener{
@Override
public void onClick(View v) {
//原则：UI中的主线程不能够直接访问网络
System.out.println("====线程名："+Thread.currentThread().getName());
getInternetThread myThread = new getInternetThread();
myThread.start();}}class getInternetThread extends Thread{
String line = "我是空";
@Override
public void run() {System.out.println("线程名："+Thread.currentThread().getName());
//获取EditText 控件里的 uri
String uri = et.getText().toString();
System.out.println("uri的值："+uri);
//访问网络
//获取客户端对象
HttpClient client = new DefaultHttpClient();
//获取请求对象,并传入uri
HttpGet get = new HttpGet(uri);
//客户端发送请求对象
try {
HttpResponse resp = client.execute(get);
//获取状态码，如果是200说明成功
int code = resp.getStatusLine().getStatusCode();
if(code == 200){
//获得返回值
InputStream in = resp.getEntity().getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
line = reader.readLine();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
et.setText(line);//设置EditText的值，这个地方会导致程序的崩溃，猜测是workThread不能够直接修改主线程即安卓UI中的数据。}}
}
安卓的页面如下：
