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android中的HttpURLConnection和HttpClient实现app与pc数据交互
自学android的这几天很辛苦，但是很满足，因为每当学到一点点知识点都会觉得很开心，觉得今天是特别有意义的，可能这个就是一种莫名的热爱吧。
下面来说说今天学习的HttpURLConnection和HttpClient的区别吧，其实这2种都能进行客户端和服务器的数据交互，只是HttpClient封装的更完全。
先看下案例吧
第一种HttpURLConnection访问服务器：
客服端代码：
package com.example.demo01;import java.io.IOException;import java.io.OutputStream;import java.io.PrintWriter;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLEncoder;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.NameValuePair;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;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 android.annotation.SuppressLint;import android.app.Activity;import android.os.Bundle;import android.os.StrictMode;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;@SuppressLint("NewApi")public class MainActivity extends Activity { private EditText unameTxt, pwdTxt; private Button loginBtn; private static String serverPath = "http://tplovejava.xicp.net/uploadApp/HttpTestServlet"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //手机安装能访问 StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() .detectDiskReads() .detectDiskWrites() .detectNetwork() // or .detectAll() for all detectable problems .penaltyLog() .build()); //手机安装能访问 StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder() .detectLeakedSqlLiteObjects() .penaltyLog() .penaltyDeath() .build()); setContentView(R.layout.activity_main); unameTxt = (EditText) findViewById(R.id.user); pwdTxt = (EditText) findViewById(R.id.pasd); loginBtn = (Button) findViewById(R.id.submit); loginBtn.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String uname = unameTxt.getText().toString(); String pwd = pwdTxt.getText().toString(); //HttpURLConnection处理服务端与客户端交互 try { URL url = new URL(serverPath); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); //设置输入 conn.setDoInput(true); //设置输出 conn.setDoOutput(true); //设置缓存 conn.setUseCaches(false); //设置POST conn.setRequestMethod("POST"); OutputStream os = conn.getOutputStream(); PrintWriter pw = new PrintWriter(os, true); pw.println(1245); //返回响应 成功200 int responseCode = conn.getResponseCode(); System.out.print(responseCode); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } public String dealEncode(String str){ String encode = ""; try { encode = URLEncoder.encode(str, "utf-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return encode; }}
第二种 HttpClient
HttpClient client = new DefaultHttpClient(); try { //设置参数集合 List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("uname", uname)); params.add(new BasicNameValuePair("pwd", pwd)); //post连接 HttpPost httpPost = new HttpPost(serverPath); httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); HttpResponse response = client.execute(httpPost); if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){ String str = EntityUtils.toString(response.getEntity(), "utf-8"); Log.i("info", str); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }
服务器：
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("utf-8"); PrintWriter pw = response.getWriter(); String uname = request.getParameter("uname"); String pwd = request.getParameter("pwd"); /*InputStream is = request.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); System.out.println(br.readLine());*/ if("zs".equals(uname) && "123".equals(pwd)){ pw.print("成功"); }else{ pw.print("失败"); } }
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