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Apache包是对android联网访问封装的很好的一个包，也是android访问网络最常用的类。
下面分别讲一下怎么用HttpClient实现get，post请求。
1.Get 请求
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HttpClient hClient = new DefaultHttpClient();httpResponse = hClient.execute(get); |
2.Post 请求
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Map<String, String> map = new HashMap<String, String>();map.put("id", id);map.put("name", name);map.put("permission", String.valueOf(permission)); List<NameValuePair> list = new ArrayList<NameValuePair>(); if(map != null && !map.isEmpty()){ for(Map.Entry<String, String> entry : map.entrySet()){//迭代器 //键值对 NameValuePair nameValuePair = new BasicNameValuePair(entry.getKey(), entry.getValue()); list.add(nameValuePair); } }UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list ,encode);//使用post方式提交数据HttpPost post = new HttpPost(path);post.setEntity(entity);//请求体中//默认客户端HttpClient client = httpClient;HttpResponse httpResponse = client.execute(post); |
3.代码实例：
先是get请求
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import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import org.apache.http.HttpEntity; 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.DefaultHttpClientConnection; import org.apache.http.impl.client.DefaultHttpClient; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { private Button requestButton; private HttpResponse httpResponse; private HttpEntity entity; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); requestButton = (Button) findViewById(R.id.requestButton); requestButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { new Thread(new Downtest()).start(); } }); } class Downtest implements Runnable{ public void run() { //生成一个请求对象,请求 //生成一个Http客户端对象 HttpClient hClient = new DefaultHttpClient(); //使用Http客户端发送请求对象 InputStream inputStream = null; try { httpResponse = hClient.execute(get);//httpResponse返回的响应 //返回的响应数据就放在里边 entity = httpResponse.getEntity(); inputStream = entity.getContent(); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); String result = ""; String line = ""; while((line = reader.readLine())!= null){ result = result+ line; } System.out.println(result); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ try{ inputStream.close(); }catch(Exception e){ e.printStackTrace(); } } } } } |
再是post请求
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public class AccountHttpUtils { //private static String PATH = "http://192.168.253.1:8088/CallName/servlet/AccountServler"; private static HttpClient httpClient; public AccountHttpUtils(HttpClient httpClient) { this.httpClient = httpClient; } public static String sendHttpClient(String path,Map<String,String> map,String encode){ List<NameValuePair> list = new ArrayList<NameValuePair>(); if(map != null && !map.isEmpty()){ for(Map.Entry<String, String> entry : map.entrySet()){//迭代器 //键值对 NameValuePair nameValuePair = new BasicNameValuePair(entry.getKey(), entry.getValue()); list.add(nameValuePair); } } try { //实现将请求的参数封装到表单中， UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list ,encode); //使用post方式提交数据 HttpPost post = new HttpPost(path); post.setEntity(entity);//请求体中 //默认客户端 HttpClient client = httpClient; HttpResponse httpResponse = client.execute(post); if(httpResponse.getStatusLine().getStatusCode() == 200){ HttpEntity httpEntity = httpResponse.getEntity(); InputStream inputStream = httpEntity.getContent(); return changeInputeStream(inputStream, encode); } } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return ""; } /** * 将一个输入流转换成字符串 * @param inputStream * @param encode * @return */ private static String changeInputeStream(InputStream inputStream,String encode) { //通常叫做内存流，写在内存中的 ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); byte[] data = new byte[1024]; int len = 0; String result = ""; if(inputStream != null){ try { while((len = inputStream.read(data))!=-1){ data.toString(); outputStream.write(data, 0, len); } //result是在服务器端设置的doPost函数中的 result = new String(outputStream.toByteArray(),encode); outputStream.flush(); outputStream.close(); inputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return result; } public static String set(String id,String name,int permission) { // TODO Auto-generated method stub Map<String, String> map = new HashMap<String, String>(); map.put("id", id); map.put("name", name); map.put("permission", String.valueOf(permission)); String result = AccountHttpUtils.sendHttpClient(AbstractHttpUtils.PATH+"servlet/AccountServler", map, "utf-8"); System.out.println("result:"+ result); return result; } } |
4.get请求访问的是百度，返回的是百度首页的源代码
post是我的一个小项目中的类
不过结构已经很清晰啦。。。。
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原文地址：http://www.cnblogs.com/HCT118/p/5069139.html
