HTTP通信，這一案例在操作的時(shí)候遇到N多種種問題，是前面看過幾個(gè)實(shí)例里面最麻煩的一個(gè)，因?yàn)闆]有系統(tǒng)的接觸過JAVA，所以出了很多錯(cuò)誤，也無從下手解決，這里經(jīng)過對錯(cuò)誤的檢索實(shí)現(xiàn)了HTTP通信，以做記錄。 實(shí)現(xiàn) HTTP 通信有兩種方式，一種是 ?httpurlconnection ，另一種是 ?HttpClient ,出于開發(fā)習(xí)慣，這里選擇了 HttpClient 做了一次實(shí)現(xiàn) 看實(shí)例 ?ApacheHttpClient.java package com.example.httpclient;import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream;import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient;import android.util.Log;public class ApacheHttpClient { private static final String TAG = "Error";public String httpGet(String url) { String result = null; HttpClient httpClient = new DefaultHttpClient(); HttpGet httpGet = new HttpGet(url); HttpResponse httpResponse = null; try { httpResponse = httpClient.execute(httpGet); int httpStatus = httpResponse.getStatusLine().getStatusCode(); if (httpStatus == HttpStatus.SC_OK) { InputStream in = httpResponse.getEntity().getContent(); try { result = readString(in); } catch (Exception e) { Log.i(TAG, "Exception"); // TODO Auto-generated catch block e.printStackTrace(); } } else { result = "badly"; } } catch (ClientProtocolException e) { // TODO Auto-generated catch block e.printStackTrace(); Log.i(TAG, "ClientProtocolException"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); Log.i(TAG, "ClientProtocolException"); } return result; }protected String readString(InputStream in) throws Exception { byte[] data = new byte[1024]; int length = 0; ByteArrayOutputStream bout = new ByteArrayOutputStream(); while ((length = in.read(data)) != -1) { bout.write(data, 0, length); } return new String(bout.toByteArray(), "GBK"); } } 以上代碼將?HttpClient 實(shí)現(xiàn)了簡單的封裝，以后使用只需調(diào)用對應(yīng)的函數(shù)就可以了，下面看一個(gè)調(diào)用 MainActivity.java package com.example.httpclient;import android.os.Bundle; import android.os.Handler; import android.app.Activity; import android.view.Menu; import android.widget.TextView;public class MainActivity extends Activity {private Handler handler = null; private String result = null;@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);handler = new Handler(); new Thread() { public void run() { ApacheHttpClient aHttpClient = new ApacheHttpClient(); result = aHttpClient.httpGet("http://192.168.1.100"); handler.post(new Runnable(){ @Override public void run() { // TODO Auto-generated method stub TextView tv = (TextView)findViewById(R.id.textView1); tv.setText(result); }}); } }.start(); }} 以上代碼實(shí)現(xiàn)了對 ApacheHttpClient.java的調(diào)用，實(shí)現(xiàn)效果是會在應(yīng)用界面上顯示服務(wù)端內(nèi)容。 這里需要說明的是，在調(diào)試過程中我遇到的問題 1、?android.os.NetworkOnMainThreadException 異常 這里說明的是，不能在主線程中訪問網(wǎng)絡(luò) 2、Only the original thread that created a view hierarchy can touch its views 這里說明的是Android的相關(guān)View和控件不是線程安全的，我們必須做獨(dú)立的處理，所以這里通過一個(gè)Handler對象可以很好的傳遞Runnable或Message

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