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");
}
}