android 简单获取服务器数据

1、activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.getserverdata.MainActivity" >

    <EditText
        android:id="@+id/et_username"
        android:hint="请输入用户名"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
         >
    </EditText>

    <EditText
        android:id="@+id/et_password"
        android:hint="请输入密码"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPassword" />

    <Button
        android:onClick="click"
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="登录" />

</LinearLayout>

2.AndroidManifest.xml 配置权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.getserverdata"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

3.get请求

package com.example.getserverdata.service;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import com.example.getserverdata.utils.StreamUtil;

public class LoginService {

    public static String loginByGet(String username,String password)
    {

        String path = "http://192.168.1.100:8088/Login.ashx?username="+username+"&password="+password;

        try {
            //创建URL
            URL url = new URL(path);

            //创建http连接
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
            //设置连接时间
            conn.setConnectTimeout(5000);
            //设置请求方式
            conn.setRequestMethod("GET");

            //获取请求码
            int code = conn.getResponseCode();

            System.out.println("code:"+code);

            if(code==200)
            {
                //请求成功
                //获取响应数据
                InputStream is = conn.getInputStream();
                //得到响应数据
                String result = StreamUtil.readInputStream(is);

                return result;
            }
            else
            {
                //请求失败
                return null;
            }

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

        return null;
    }

}

4.将InputStream转为String

package com.example.getserverdata.utils;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamUtil {

    public static String readInputStream(InputStream is)
    {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] data = new byte[1024];
        int len = 0;
        try {
            while((len = is.read(data))!=-1)
                baos.write(data, 0, len);
            is.close();
            baos.close();
            return new String(baos.toByteArray());

        } catch (Exception e) {

            e.printStackTrace();
        }  

        return null;
    }
}

5.MainActivity

package com.example.getserverdata;

import com.example.getserverdata.service.LoginService;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    private EditText et_username;
    private EditText et_password;

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

        et_username = (EditText)findViewById(R.id.et_username);
        et_password = (EditText)findViewById(R.id.et_password);
    }

    public void click(View view)
    {

        final String username = et_username.getText().toString().trim();
        final String password = et_password.getText().toString().trim();

        new Thread(){

            public void run(){

                final String result = LoginService.loginByGet(username, password);

                System.out.println("reuslt:"+result);

                if(result!=null)
                {
                    runOnUiThread(new Runnable(){

                        @Override
                        public void run() {

                            Toast.makeText(MainActivity.this, result, 0).show();
                        }

                    });

                }

                else
                {
                    runOnUiThread(new Runnable(){

                        @Override
                        public void run() {
                            Toast.makeText(MainActivity.this, "获取数据失败", 0).show();
                        }
                    });

                }

            }

        }.start();

    }

}