以Get/Post方式获取网页信息

第一步 权限设置

package com.test;


import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.apache.http.client.HttpClient;


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


public class HttpActivity extends Activity {


private Button mButton1, mButton2;
private TextView mTextView1;


public void onCreate(Bundle savedInstanceState) {


super.onCreate(savedInstanceState);
setContentView(R.layout.main);


mButton1 = (Button) findViewById(R.id.myButton1);
mButton2 = (Button) findViewById(R.id.myButton2);
mTextView1 = (TextView) findViewById(R.id.myTextView1);


mButton1.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
String uriAPI = "http://www.baidu.com";


HttpPost httpRequest = new HttpPost(uriAPI);
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("str", "post string"));
try {
httpRequest.setEntity(new UrlEncodedFormEntity(params,
HTTP.UTF_8));
HttpResponse httpResponse = new DefaultHttpClient()
.execute(httpRequest);


if (httpResponse.getStatusLine().getStatusCode() == 200) {


String strResult = EntityUtils.toString(httpResponse
.getEntity());
mTextView1.setText(strResult);
} else {
mTextView1.setText("Error Response: "
+ httpResponse.getStatusLine().toString());
}
} catch (ClientProtocolException e) {
mTextView1.setText(e.getMessage().toString());
e.printStackTrace();
} catch (IOException e) {
mTextView1.setText(e.getMessage().toString());
e.printStackTrace();
} catch (Exception e) {
mTextView1.setText(e.getMessage().toString());
e.printStackTrace();
}


}
});


mButton2.setOnClickListener(new Button.OnClickListener() {


public void onClick(View v) {


String uriAPI = "http://www.baidu.com";


HttpGet httpRequest = new HttpGet(uriAPI);
try {


HttpResponse httpResponse = new DefaultHttpClient()
.execute(httpRequest);


if (httpResponse.getStatusLine().getStatusCode() == 200) {


String strResult = EntityUtils.toString(httpResponse
.getEntity());


strResult = eregi_replace("(\r\n|\r|\n|\n\r)", "",
strResult);
mTextView1.setText(strResult);
} else {
mTextView1.setText("Error Response: "
+ httpResponse.getStatusLine().toString());
}
} catch (ClientProtocolException e) {
mTextView1.setText(e.getMessage().toString());
e.printStackTrace();
} catch (IOException e) {
mTextView1.setText(e.getMessage().toString());
e.printStackTrace();
} catch (Exception e) {
mTextView1.setText(e.getMessage().toString());
e.printStackTrace();
}
}
});
}


public String eregi_replace(String strFrom, String strTo, String strTarget) {
String strPattern = "(?i)" + strFrom;
Pattern p = Pattern.compile(strPattern);
Matcher m = p.matcher(strTarget);
if (m.find()) {
return strTarget.replaceAll(strFrom, strTo);
} else {
return strTarget;
}
}
}