通过HttpClient方式连接网络

xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.zzw.request.MainActivity" >

    <EditText
        android:id="@+id/username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入用户名" />

    <EditText
        android:id="@+id/password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/username"
        android:hint="输入密码" />

    <Button
        android:id="@+id/get"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/password"
        android:onClick="getClient"
        android:text="get请求" />

    <Button
        android:id="@+id/post"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/get"
        android:onClick="postClient"
        android:text="post请求" />

</RelativeLayout>

 java代码：

  1 package com.zzw.httpClient;
  2 
  3 import java.io.ByteArrayOutputStream;
  4 import java.io.IOException;
  5 import java.io.InputStream;
  6 import java.util.ArrayList;
  7 import java.util.List;
  8 
  9 import org.apache.http.HttpEntity;
 10 import org.apache.http.HttpResponse;
 11 import org.apache.http.NameValuePair;
 12 import org.apache.http.client.ClientProtocolException;
 13 import org.apache.http.client.HttpClient;
 14 import org.apache.http.client.entity.UrlEncodedFormEntity;
 15 import org.apache.http.client.methods.HttpGet;
 16 import org.apache.http.client.methods.HttpPost;
 17 import org.apache.http.impl.client.DefaultHttpClient;
 18 import org.apache.http.impl.conn.DefaultClientConnection;
 19 import org.apache.http.message.BasicNameValuePair;
 20 
 21 import android.app.Activity;
 22 import android.os.Bundle;
 23 import android.view.Menu;
 24 import android.view.MenuItem;
 25 import android.view.View;
 26 import android.widget.EditText;
 27 import android.widget.Toast;
 28 
 29 public class MainActivity extends Activity {
 30     EditText username_et = null;
 31     EditText passWord_et = null;
 32 
 33     @Override
 34     protected void onCreate(Bundle savedInstanceState) {
 35         super.onCreate(savedInstanceState);
 36         setContentView(R.layout.activity_main);
 37         username_et = (EditText) findViewById(R.id.username);
 38         passWord_et = (EditText) findViewById(R.id.password);
 39     }
 40 
 41     public void getClient(View view) {
 42         new Thread(new Runnable() {
 43             @Override
 44             public void run() {
 45                 try {
 46                     // 1、获得一个client，相当于浏览器
 47                     HttpClient client = new DefaultHttpClient();
 48                     // 2、定义一个get请求，并且封装参数
 49                     String data = "username=" + username_et.getText().toString() + "&password="
 50                             + passWord_et.getText().toString();
 51                     HttpGet get = new HttpGet("http://10.0.2.2:8080/baidu/LoginServelt?" + data);
 52                     // 3、用定义好的浏览器来请求一个地址
 53                     HttpResponse response = client.execute(get);
 54                     int status = response.getStatusLine().getStatusCode();
 55                     if (status == 200) {
 56                         final String content = getStringFromStream(response.getEntity().getContent());
 57                         runOnUiThread(new Runnable() {
 58                             @Override
 59                             public void run() {
 60                                 Toast.makeText(MainActivity.this, "返回信息:" + content, 0).show();
 61                             }
 62                         });
 63 
 64                     }
 65                 } catch (ClientProtocolException e) {
 66                     // TODO Auto-generated catch block
 67                     e.printStackTrace();
 68                 } catch (IOException e) {
 69                     // TODO Auto-generated catch block
 70                     e.printStackTrace();
 71                 }
 72 
 73             }
 74         }).start();
 75     }
 76 
 77     public void postClient(View view) {
 78         new Thread(new Runnable() {
 79             @Override
 80             public void run() {
 81                 try {
 82                     // 1、获得client
 83                     HttpClient client = new DefaultHttpClient();
 84                     // 2、获得POST请求及设置参数
 85                     HttpPost post = new HttpPost("http://10.0.2.2:8080/baidu/LoginServelt");
 86                     List<NameValuePair> parameters = new ArrayList<NameValuePair>();
 87                     NameValuePair nameuser = new BasicNameValuePair("username", username_et.getText().toString());
 88                     NameValuePair passWord = new BasicNameValuePair("passWord", passWord_et.getText().toString());
 89                     parameters.add(nameuser);
 90                     parameters.add(passWord);
 91 
 92                     HttpEntity entity = new UrlEncodedFormEntity(parameters, "UTF-8");
 93                     post.setEntity(entity);
 94                     // 3、执行post请求
 95                     HttpResponse response = client.execute(post);
 96                     int status = response.getStatusLine().getStatusCode();
 97                     if (status == 200) {
 98                         final String content = getStringFromStream(response.getEntity().getContent());
 99                         runOnUiThread(new Runnable() {
100                             
101                             @Override
102                             public void run() {
103                                 Toast.makeText(MainActivity.this,"POST："+content,0).show();
104                             }
105                         });
106                         
107                     
108                     }
109                 } catch (ClientProtocolException e) {
110                     // TODO Auto-generated catch block
111                     e.printStackTrace();
112                 } catch (IOException e) {
113                     // TODO Auto-generated catch block
114                     e.printStackTrace();
115                 }
116             }
117         }).start();
118     }
119 
120     public String getStringFromStream(InputStream in) throws IOException {
121         byte[] buffer = new byte[1024];
122         ByteArrayOutputStream byteArray = new ByteArrayOutputStream();
123         int leng = 0;
124         while ((leng = in.read(buffer, 0, 1024)) != -1) {
125             byteArray.write(buffer);
126         }
127         String content = byteArray.toString();
128         byteArray.close();
129         return content;
130     }
131 }