android post方式給后臺(tái)服務(wù)器傳遞數(shù)據(jù)

請(qǐng)求方式GET和POST的簡(jiǎn)單分別：

    get方式是把參數(shù)附加到URL地址后面,如：

    http://localhost:8080/loginServlet.html?username=123&password=456

    post是將請(qǐng)求參數(shù)放到請(qǐng)求體中，以流的方式傳到服務(wù)器，另外上傳文件時(shí)，一定是post方式

下面的代碼是用post方式模擬用戶(hù)登錄

package com.yuanlp.qqloginpost;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

public class MainActivity extends AppCompatActivity {

    private static final int LOAD_SUCCESS =1 ;
    private static final int LOAD_ERROR =2 ;
    private EditText mQqNum;
    private EditText mQqPwd;
    private CheckBox mCb_rember;

    private Button sub;
    private String mQq;
    private String mPwd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

       mQqNum= (EditText) findViewById(R.id.et_qqNum);
        mQqPwd = (EditText) findViewById(R.id.et_pwd);
        mCb_rember = (CheckBox) findViewById(R.id.cb_rember);
        sub = (Button) findViewById(R.id.bt_sub);

    }

    /**
     * 按鈕對(duì)應(yīng)的點(diǎn)擊方法
     * @param view
     */
    public void login(View view){
        //Toast.makeText(this,"點(diǎn)擊了提交",Toast.LENGTH_SHORT).show();
        mQq = mQqNum.getText().toString().trim();
        mPwd = mQqPwd.getText().toString().trim();
        //mCb_rember.getText().toString().trim();
        if (TextUtils.isEmpty(mQq)||TextUtils.isEmpty(mPwd)){
            Toast.makeText(this,"QQ號(hào)碼或者密碼為空",Toast.LENGTH_SHORT).show();
            return;
        }

        //這里設(shè)置按鈕不能點(diǎn)，應(yīng)為一直點(diǎn)，就一直發(fā)送請(qǐng)求，會(huì)造成一直請(qǐng)求數(shù)據(jù)
        sub.setEnabled(false);

             /** 
             * 點(diǎn)擊按鈕事件，在主線程中開(kāi)啟一個(gè)子線程進(jìn)行網(wǎng)絡(luò)請(qǐng)求 
             * （因?yàn)樵?.0只有不支持主線程進(jìn)行網(wǎng)絡(luò)請(qǐng)求，所以一般情況下，建議另開(kāi)啟子線程進(jìn)行網(wǎng)絡(luò)請(qǐng)求等耗時(shí)操作）。 
             */
        //請(qǐng)求網(wǎng)絡(luò)
        new Thread(){
            @Override
            public void run() {
                try {
                    Thread.sleep(5000);
                    String path="http://192.168.1.111:10010/aos/pdaLogin.jhtml";
                    URL url = new URL(path);
                    //打開(kāi)httpurlconnection
                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                    conn.setRequestMethod("POST");              //設(shè)置get方式獲取數(shù)據(jù)
                    conn.setConnectTimeout(5000);              //設(shè)置連接超時(shí)時(shí)間5秒

                    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");  //如果設(shè)置方式為post，則必須制定該屬性
                    //將數(shù)據(jù)進(jìn)行編碼,然后會(huì)自動(dòng)的將該數(shù)據(jù)放到post中傳到后臺(tái)
                    String data="username="+ URLEncoder.encode(mQq,"utf-8")+"&password="+URLEncoder.encode(mPwd,"utf-8");
                    //指定長(zhǎng)度
                    conn.setRequestProperty("Content-length",String.valueOf(data.length()));
                    /**
                     * post是以流的方式寫(xiě)給服務(wù)器
                     */
                    conn.setDoOutput(true); //指定輸出模式
                    conn.getOutputStream().write(data.getBytes());  //將要傳遞的數(shù)據(jù)寫(xiě)入輸出流

                    int code = conn.getResponseCode();         // 獲取response狀態(tài)，200表示成功獲取資源，404表示資源不存在
                    if (code==200){
                        InputStream is=conn.getInputStream();

                        BufferedReader br=new BufferedReader(new InputStreamReader(is));
                        StringBuffer sb=new StringBuffer();
                        String len=null;

                        while((len=br.readLine())!=null){
                            sb.append(len);
                        }
                        String result=sb.toString();
                        /**
                         * 這里就不用handler方式來(lái)處理子線程的數(shù)據(jù)了
                        */

                        runToastAnyThread(result);

                    }
                } catch (Exception e) {
                    e.printStackTrace();

                }
            }
        }.start();

    }



    /**
     * 在任何線程中都可以彈出吐司
     * @param result
     */
    private void runToastAnyThread(final String result) {
        /**
         * 在這個(gè)run方法里寫(xiě)的任何方法都是在UI線程中執(zhí)行
         */
        runOnUiThread(new Runnable() {
           @Override
            public void run() {
               JSONObject jsonObject=null;
               try {
                   jsonObject=new JSONObject(result);
                   String code=jsonObject.get("appcode").toString();
                   if ("0".equals(code)){
                      Toast.makeText(getApplicationContext(),"登錄失敗",Toast.LENGTH_SHORT).show();
                   }else if("1".equals(code)){
                       Toast.makeText(getApplicationContext(),"登錄成功",Toast.LENGTH_SHORT).show();
                   }
                   sub.setEnabled(true);
               } catch (JSONException e) {
                   e.printStackTrace();
               }
            }
        });
    }
}