android中的HttpURLConnection和HttpClient实现app与pc数据交互

时间：2022-11-09 15:58:29

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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