Android http get/post传递参数

    本程序介绍如何通过HttpClient模块来创建Http连接，并分别以Http Get和Post方法传递参数，连接之后取回web server的返回网页结果。

     注意，在用Post时，传递变量必须用NameValuePais[]数组存储，通过HttpRequest.setEntity()方法来发出http请求。

     此外，也必须通过DefaultHttpClient().execute(httpRequest)添加HttpRequest对象来接收web server的回复，在通过httpResponse.getEntity()取出回复信息。

/*必需引用apache.http相关类别来建立HTTP联机*/ 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; /*必需引用java.io 与java.util相关类来读写文件*/ import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class EX08_01 extends Activity { /*声明两个Button对象,与一个TextView对象*/ private Button mButton1,mButton2; private TextView mTextView1; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); /*透过findViewById建构子建立TextView与Button对象*/ mButton1 =(Button) findViewById(R.id.myButton1); mButton2 =(Button) findViewById(R.id.myButton2); mTextView1 = (TextView) findViewById(R.id.myTextView1); /*设定OnClickListener来聆听OnClick事件*/ mButton1.setOnClickListener(new Button.OnClickListener() { /*重写onClick事件*/ @Override public void onClick(View v) { /*声明网址字符串*/ String uriAPI = "http://www.dubblogs.cc:8751/Android/Test/API/Post/index.php"; /*建立HTTP Post联机*/ HttpPost httpRequest = new HttpPost(uriAPI); /* * Post运作传送变量必须用NameValuePair[]数组储存 */ List <NameValuePair> params = new ArrayList <NameValuePair>(); params.add(new BasicNameValuePair("str", "I am Post String")); try { /*发出HTTP request*/ httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); /*取得HTTP response*/ HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest); /*若状态码为200 ok*/ if(httpResponse.getStatusLine().getStatusCode() == 200) { /*取出响应字符串*/ 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() { @Override public void onClick(View v) { // TODO Auto-generated method stub /*声明网址字符串*/ String uriAPI = "http://www.dubblogs.cc:8751/Android/Test/API/Get/index.php?str=I+am+Get+String"; /*建立HTTP Get联机*/ HttpGet httpRequest = new HttpGet(uriAPI); try { /*发出HTTP request*/ HttpResponse httpResponse = new DefaultHttpClient().execute(httpRequest); /*若状态码为200 ok*/ if(httpResponse.getStatusLine().getStatusCode() == 200) { /*取出响应字符串*/ String strResult = EntityUtils.toString(httpResponse.getEntity()); /*删除多余字符*/ 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(); } } }); } /* 自定义字符串取代函数 */ 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; } } }   

在androidManifest.xml中必须添加权限：

<uses-permission android:name="android.permission.INTERNET"></uses-permission>