HttpClient和HttpResponse的使用

HttpClient ：发起Http连接请求的对象，

HttpResponse ：Http 请求返回的响应。

 

总的设计思路如下：

发送请求：(HttpResponse)response=(HttpClient)client.execute((HttpGet)request);

获取响应数据：response.getEntity().getContent();

简单的示例举例如下，主要实现获取www.baidu.com的内容：
特别注意要在AndroidManifest.xml添加访问网络的权限！！！

MainActivity.java

package com.android.httpclient;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
/** Called when the activity is first created. */
private Button btn;
private TextView tv;
private String content = null;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

btn = (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.textView1);
btn.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet("http://www.baidu.com/");
try{
HttpResponse response = client.execute(request);
BufferedReader reader = new BufferedReader(new InputStreamReader(
response.getEntity().getContent()));
for(String s = reader.readLine(); s != null; s = reader.readLine()){
content += s;
}
tv.setText(content);
}catch (Exception e){
e.printStackTrace();
}
}

});

}
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
<Button
android:text="Button"
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</Button>
<TextView
android:text="TextView"
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.httpclient"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="1" />
<uses-permission android:name="android.permission.INTERNET"/>

<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

</application>

</manifest>