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Android快速開發系列 10個常用工具類

編輯：關於Android編程

打開大家手上的項目，基本都會有一大批的輔助類，今天特此整理出10個基本每個項目中都會使用的工具類，用於快速開發~~

在此感謝群裡給我發項目中工具類的兄弟/姐妹~

1、日志工具類L.java

package com.zhy.utils;

import android.util.Log;

/**
 * Log統一管理類
 * 
 * 
 * 
 */
public class L
{

	private L()
	{
		/* cannot be instantiated */
		throw new UnsupportedOperationException(cannot be instantiated);
	}

	public static boolean isDebug = true;// 是否需要打印bug，可以在application的onCreate函數裡面初始化
	private static final String TAG = way;

	// 下面四個是默認tag的函數
	public static void i(String msg)
	{
		if (isDebug)
			Log.i(TAG, msg);
	}

	public static void d(String msg)
	{
		if (isDebug)
			Log.d(TAG, msg);
	}

	public static void e(String msg)
	{
		if (isDebug)
			Log.e(TAG, msg);
	}

	public static void v(String msg)
	{
		if (isDebug)
			Log.v(TAG, msg);
	}

	// 下面是傳入自定義tag的函數
	public static void i(String tag, String msg)
	{
		if (isDebug)
			Log.i(tag, msg);
	}

	public static void d(String tag, String msg)
	{
		if (isDebug)
			Log.i(tag, msg);
	}

	public static void e(String tag, String msg)
	{
		if (isDebug)
			Log.i(tag, msg);
	}

	public static void v(String tag, String msg)
	{
		if (isDebug)
			Log.i(tag, msg);
	}
}

網上看到的類，注釋上應該原創作者的名字，很簡單的一個類；網上也有很多提供把日志記錄到SDCard上的，不過我是從來沒記錄過，所以引入個最簡單的，大家可以進行評價是否需要擴充~~

2、Toast統一管理類

package com.zhy.utils;

import android.content.Context;
import android.widget.Toast;

/**
 * Toast統一管理類
 * 
 */
public class T
{

	private T()
	{
		/* cannot be instantiated */
		throw new UnsupportedOperationException(cannot be instantiated);
	}

	public static boolean isShow = true;

	/**
	 * 短時間顯示Toast
	 * 
	 * @param context
	 * @param message
	 */
	public static void showShort(Context context, CharSequence message)
	{
		if (isShow)
			Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
	}

	/**
	 * 短時間顯示Toast
	 * 
	 * @param context
	 * @param message
	 */
	public static void showShort(Context context, int message)
	{
		if (isShow)
			Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
	}

	/**
	 * 長時間顯示Toast
	 * 
	 * @param context
	 * @param message
	 */
	public static void showLong(Context context, CharSequence message)
	{
		if (isShow)
			Toast.makeText(context, message, Toast.LENGTH_LONG).show();
	}

	/**
	 * 長時間顯示Toast
	 * 
	 * @param context
	 * @param message
	 */
	public static void showLong(Context context, int message)
	{
		if (isShow)
			Toast.makeText(context, message, Toast.LENGTH_LONG).show();
	}

	/**
	 * 自定義顯示Toast時間
	 * 
	 * @param context
	 * @param message
	 * @param duration
	 */
	public static void show(Context context, CharSequence message, int duration)
	{
		if (isShow)
			Toast.makeText(context, message, duration).show();
	}

	/**
	 * 自定義顯示Toast時間
	 * 
	 * @param context
	 * @param message
	 * @param duration
	 */
	public static void show(Context context, int message, int duration)
	{
		if (isShow)
			Toast.makeText(context, message, duration).show();
	}

}

也是非常簡單的一個封裝，能省則省了~~

3、SharedPreferences封裝類SPUtils

package com.zhy.utils;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;

public class SPUtils
{
	/**
	 * 保存在手機裡面的文件名
	 */
	public static final String FILE_NAME = share_data;

	/**
	 * 保存數據的方法，我們需要拿到保存數據的具體類型，然後根據類型調用不同的保存方法
	 * 
	 * @param context
	 * @param key
	 * @param object
	 */
	public static void put(Context context, String key, Object object)
	{

		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();

		if (object instanceof String)
		{
			editor.putString(key, (String) object);
		} else if (object instanceof Integer)
		{
			editor.putInt(key, (Integer) object);
		} else if (object instanceof Boolean)
		{
			editor.putBoolean(key, (Boolean) object);
		} else if (object instanceof Float)
		{
			editor.putFloat(key, (Float) object);
		} else if (object instanceof Long)
		{
			editor.putLong(key, (Long) object);
		} else
		{
			editor.putString(key, object.toString());
		}

		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 得到保存數據的方法，我們根據默認值得到保存的數據的具體類型，然後調用相對於的方法獲取值
	 * 
	 * @param context
	 * @param key
	 * @param defaultObject
	 * @return
	 */
	public static Object get(Context context, String key, Object defaultObject)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);

		if (defaultObject instanceof String)
		{
			return sp.getString(key, (String) defaultObject);
		} else if (defaultObject instanceof Integer)
		{
			return sp.getInt(key, (Integer) defaultObject);
		} else if (defaultObject instanceof Boolean)
		{
			return sp.getBoolean(key, (Boolean) defaultObject);
		} else if (defaultObject instanceof Float)
		{
			return sp.getFloat(key, (Float) defaultObject);
		} else if (defaultObject instanceof Long)
		{
			return sp.getLong(key, (Long) defaultObject);
		}

		return null;
	}

	/**
	 * 移除某個key值已經對應的值
	 * @param context
	 * @param key
	 */
	public static void remove(Context context, String key)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();
		editor.remove(key);
		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 清除所有數據
	 * @param context
	 */
	public static void clear(Context context)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();
		editor.clear();
		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 查詢某個key是否已經存在
	 * @param context
	 * @param key
	 * @return
	 */
	public static boolean contains(Context context, String key)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		return sp.contains(key);
	}

	/**
	 * 返回所有的鍵值對
	 * 
	 * @param context
	 * @return
	 */
	public static Map getAll(Context context)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		return sp.getAll();
	}

	/**
	 * 創建一個解決SharedPreferencesCompat.apply方法的一個兼容類
	 * 
	 * @author zhy
	 * 
	 */
	private static class SharedPreferencesCompat
	{
		private static final Method sApplyMethod = findApplyMethod();

		/**
		 * 反射查找apply的方法
		 * 
		 * @return
		 */
		@SuppressWarnings({ unchecked, rawtypes })
		private static Method findApplyMethod()
		{
			try
			{
				Class clz = SharedPreferences.Editor.class;
				return clz.getMethod(apply);
			} catch (NoSuchMethodException e)
			{
			}

			return null;
		}

		/**
		 * 如果找到則使用apply執行，否則使用commit
		 * 
		 * @param editor
		 */
		public static void apply(SharedPreferences.Editor editor)
		{
			try
			{
				if (sApplyMethod != null)
				{
					sApplyMethod.invoke(editor);
					return;
				}
			} catch (IllegalArgumentException e)
			{
			} catch (IllegalAccessException e)
			{
			} catch (InvocationTargetException e)
			{
			}
			editor.commit();
		}
	}

}

對SharedPreference的使用做了建議的封裝，對外公布出put，get，remove，clear等等方法；

注意一點，裡面所有的commit操作使用了SharedPreferencesCompat.apply進行了替代，目的是盡可能的使用apply代替commit

首先說下為什麼，因為commit方法是同步的，並且我們很多時候的commit操作都是UI線程中，畢竟是IO操作，盡可能異步；

所以我們使用apply進行替代，apply異步的進行寫入；

但是apply相當於commit來說是new API呢，為了更好的兼容，我們做了適配；

SharedPreferencesCompat也可以給大家創建兼容類提供了一定的參考~~

4、單位轉換類 DensityUtils

package com.zhy.utils;

import android.content.Context;
import android.util.TypedValue;

/**
 * 常用單位轉換的輔助類
 * 
 * 
 * 
 */
public class DensityUtils
{
	private DensityUtils()
	{
		/* cannot be instantiated */
		throw new UnsupportedOperationException(cannot be instantiated);
	}

	/**
	 * dp轉px
	 * 
	 * @param context
	 * @param val
	 * @return
	 */
	public static int dp2px(Context context, float dpVal)
	{
		return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
				dpVal, context.getResources().getDisplayMetrics());
	}

	/**
	 * sp轉px
	 * 
	 * @param context
	 * @param val
	 * @return
	 */
	public static int sp2px(Context context, float spVal)
	{
		return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
				spVal, context.getResources().getDisplayMetrics());
	}

	/**
	 * px轉dp
	 * 
	 * @param context
	 * @param pxVal
	 * @return
	 */
	public static float px2dp(Context context, float pxVal)
	{
		final float scale = context.getResources().getDisplayMetrics().density;
		return (pxVal / scale);
	}

	/**
	 * px轉sp
	 * 
	 * @param fontScale
	 * @param pxVal
	 * @return
	 */
	public static float px2sp(Context context, float pxVal)
	{
		return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);
	}

}

5、SD卡相關輔助類 SDCardUtils

package com.zhy.utils;

import java.io.File;

import android.os.Environment;
import android.os.StatFs;

/**
 * SD卡相關的輔助類
 * 
 * 
 * 
 */
public class SDCardUtils
{
	private SDCardUtils()
	{
		/* cannot be instantiated */
		throw new UnsupportedOperationException(cannot be instantiated);
	}

	/**
	 * 判斷SDCard是否可用
	 * 
	 * @return
	 */
	public static boolean isSDCardEnable()
	{
		return Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED);

	}

	/**
	 * 獲取SD卡路徑
	 * 
	 * @return
	 */
	public static String getSDCardPath()
	{
		return Environment.getExternalStorageDirectory().getAbsolutePath()
				+ File.separator;
	}

	/**
	 * 獲取SD卡的剩余容量 單位byte
	 * 
	 * @return
	 */
	public static long getSDCardAllSize()
	{
		if (isSDCardEnable())
		{
			StatFs stat = new StatFs(getSDCardPath());
			// 獲取空閒的數據塊的數量
			long availableBlocks = (long) stat.getAvailableBlocks() - 4;
			// 獲取單個數據塊的大小（byte）
			long freeBlocks = stat.getAvailableBlocks();
			return freeBlocks * availableBlocks;
		}
		return 0;
	}

	/**
	 * 獲取指定路徑所在空間的剩余可用容量字節數，單位byte
	 * 
	 * @param filePath
	 * @return 容量字節 SDCard可用空間，內部存儲可用空間
	 */
	public static long getFreeBytes(String filePath)
	{
		// 如果是sd卡的下的路徑，則獲取sd卡可用容量
		if (filePath.startsWith(getSDCardPath()))
		{
			filePath = getSDCardPath();
		} else
		{// 如果是內部存儲的路徑，則獲取內存存儲的可用容量
			filePath = Environment.getDataDirectory().getAbsolutePath();
		}
		StatFs stat = new StatFs(filePath);
		long availableBlocks = (long) stat.getAvailableBlocks() - 4;
		return stat.getBlockSize() * availableBlocks;
	}

	/**
	 * 獲取系統存儲路徑
	 * 
	 * @return
	 */
	public static String getRootDirectoryPath()
	{
		return Environment.getRootDirectory().getAbsolutePath();
	}


}

6、屏幕相關輔助類 ScreenUtils

package com.zhy.utils;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.util.DisplayMetrics;
import android.view.View;
import android.view.WindowManager;

/**
 * 獲得屏幕相關的輔助類
 * 
 * 
 * 
 */
public class ScreenUtils
{
	private ScreenUtils()
	{
		/* cannot be instantiated */
		throw new UnsupportedOperationException(cannot be instantiated);
	}

	/**
	 * 獲得屏幕高度
	 * 
	 * @param context
	 * @return
	 */
	public static int getScreenWidth(Context context)
	{
		WindowManager wm = (WindowManager) context
				.getSystemService(Context.WINDOW_SERVICE);
		DisplayMetrics outMetrics = new DisplayMetrics();
		wm.getDefaultDisplay().getMetrics(outMetrics);
		return outMetrics.widthPixels;
	}

	/**
	 * 獲得屏幕寬度
	 * 
	 * @param context
	 * @return
	 */
	public static int getScreenHeight(Context context)
	{
		WindowManager wm = (WindowManager) context
				.getSystemService(Context.WINDOW_SERVICE);
		DisplayMetrics outMetrics = new DisplayMetrics();
		wm.getDefaultDisplay().getMetrics(outMetrics);
		return outMetrics.heightPixels;
	}

	/**
	 * 獲得狀態欄的高度
	 * 
	 * @param context
	 * @return
	 */
	public static int getStatusHeight(Context context)
	{

		int statusHeight = -1;
		try
		{
			Class clazz = Class.forName(com.android.internal.R$dimen);
			Object object = clazz.newInstance();
			int height = Integer.parseInt(clazz.getField(status_bar_height)
					.get(object).toString());
			statusHeight = context.getResources().getDimensionPixelSize(height);
		} catch (Exception e)
		{
			e.printStackTrace();
		}
		return statusHeight;
	}

	/**
	 * 獲取當前屏幕截圖，包含狀態欄
	 * 
	 * @param activity
	 * @return
	 */
	public static Bitmap snapShotWithStatusBar(Activity activity)
	{
		View view = activity.getWindow().getDecorView();
		view.setDrawingCacheEnabled(true);
		view.buildDrawingCache();
		Bitmap bmp = view.getDrawingCache();
		int width = getScreenWidth(activity);
		int height = getScreenHeight(activity);
		Bitmap bp = null;
		bp = Bitmap.createBitmap(bmp, 0, 0, width, height);
		view.destroyDrawingCache();
		return bp;

	}

	/**
	 * 獲取當前屏幕截圖，不包含狀態欄
	 * 
	 * @param activity
	 * @return
	 */
	public static Bitmap snapShotWithoutStatusBar(Activity activity)
	{
		View view = activity.getWindow().getDecorView();
		view.setDrawingCacheEnabled(true);
		view.buildDrawingCache();
		Bitmap bmp = view.getDrawingCache();
		Rect frame = new Rect();
		activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
		int statusBarHeight = frame.top;

		int width = getScreenWidth(activity);
		int height = getScreenHeight(activity);
		Bitmap bp = null;
		bp = Bitmap.createBitmap(bmp, 0, statusBarHeight, width, height
				- statusBarHeight);
		view.destroyDrawingCache();
		return bp;

	}

}

7、App相關輔助類

package com.zhy.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

/**
 * 跟App相關的輔助類
 * 
 * 
 * 
 */
public class AppUtils
{

	private AppUtils()
	{
		/* cannot be instantiated */
		throw new UnsupportedOperationException(cannot be instantiated);

	}

	/**
	 * 獲取應用程序名稱
	 */
	public static String getAppName(Context context)
	{
		try
		{
			PackageManager packageManager = context.getPackageManager();
			PackageInfo packageInfo = packageManager.getPackageInfo(
					context.getPackageName(), 0);
			int labelRes = packageInfo.applicationInfo.labelRes;
			return context.getResources().getString(labelRes);
		} catch (NameNotFoundException e)
		{
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * [獲取應用程序版本名稱信息]
	 * 
	 * @param context
	 * @return 當前應用的版本名稱
	 */
	public static String getVersionName(Context context)
	{
		try
		{
			PackageManager packageManager = context.getPackageManager();
			PackageInfo packageInfo = packageManager.getPackageInfo(
					context.getPackageName(), 0);
			return packageInfo.versionName;

		} catch (NameNotFoundException e)
		{
			e.printStackTrace();
		}
		return null;
	}

}

8、軟鍵盤相關輔助類KeyBoardUtils

package com.zhy.utils;

import android.content.Context;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;

/**
 * 打開或關閉軟鍵盤
 * 
 * @author zhy
 * 
 */
public class KeyBoardUtils
{
	/**
	 * 打卡軟鍵盤
	 * 
	 * @param mEditText
	 *            輸入框
	 * @param mContext
	 *            上下文
	 */
	public static void openKeybord(EditText mEditText, Context mContext)
	{
		InputMethodManager imm = (InputMethodManager) mContext
				.getSystemService(Context.INPUT_METHOD_SERVICE);
		imm.showSoftInput(mEditText, InputMethodManager.RESULT_SHOWN);
		imm.toggleSoftInput(InputMethodManager.SHOW_FORCED,
				InputMethodManager.HIDE_IMPLICIT_ONLY);
	}

	/**
	 * 關閉軟鍵盤
	 * 
	 * @param mEditText
	 *            輸入框
	 * @param mContext
	 *            上下文
	 */
	public static void closeKeybord(EditText mEditText, Context mContext)
	{
		InputMethodManager imm = (InputMethodManager) mContext
				.getSystemService(Context.INPUT_METHOD_SERVICE);

		imm.hideSoftInputFromWindow(mEditText.getWindowToken(), 0);
	}
}

9、網絡相關輔助類 NetUtils

package com.zhy.utils;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

/**
 * 跟網絡相關的工具類
 * 
 * 
 * 
 */
public class NetUtils
{
	private NetUtils()
	{
		/* cannot be instantiated */
		throw new UnsupportedOperationException(cannot be instantiated);
	}

	/**
	 * 判斷網絡是否連接
	 * 
	 * @param context
	 * @return
	 */
	public static boolean isConnected(Context context)
	{

		ConnectivityManager connectivity = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);

		if (null != connectivity)
		{

			NetworkInfo info = connectivity.getActiveNetworkInfo();
			if (null != info && info.isConnected())
			{
				if (info.getState() == NetworkInfo.State.CONNECTED)
				{
					return true;
				}
			}
		}
		return false;
	}

	/**
	 * 判斷是否是wifi連接
	 */
	public static boolean isWifi(Context context)
	{
		ConnectivityManager cm = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);

		if (cm == null)
			return false;
		return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;

	}

	/**
	 * 打開網絡設置界面
	 */
	public static void openSetting(Activity activity)
	{
		Intent intent = new Intent(/);
		ComponentName cm = new ComponentName(com.android.settings,
				com.android.settings.WirelessSettings);
		intent.setComponent(cm);
		intent.setAction(android.intent.action.VIEW);
		activity.startActivityForResult(intent, 0);
	}

}

10、Http相關輔助類 HttpUtils

package com.zhy.utils;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Http請求的工具類
 * 
 * @author zhy
 * 
 */
public class HttpUtils
{

	private static final int TIMEOUT_IN_MILLIONS = 5000;

	public interface CallBack
	{
		void onRequestComplete(String result);
	}


	/**
	 * 異步的Get請求
	 * 
	 * @param urlStr
	 * @param callBack
	 */
	public static void doGetAsyn(final String urlStr, final CallBack callBack)
	{
		new Thread()
		{
			public void run()
			{
				try
				{
					String result = doGet(urlStr);
					if (callBack != null)
					{
						callBack.onRequestComplete(result);
					}
				} catch (Exception e)
				{
					e.printStackTrace();
				}

			};
		}.start();
	}

	/**
	 * 異步的Post請求
	 * @param urlStr
	 * @param params
	 * @param callBack
	 * @throws Exception
	 */
	public static void doPostAsyn(final String urlStr, final String params,
			final CallBack callBack) throws Exception
	{
		new Thread()
		{
			public void run()
			{
				try
				{
					String result = doPost(urlStr, params);
					if (callBack != null)
					{
						callBack.onRequestComplete(result);
					}
				} catch (Exception e)
				{
					e.printStackTrace();
				}

			};
		}.start();

	}

	/**
	 * Get請求，獲得返回數據
	 * 
	 * @param urlStr
	 * @return
	 * @throws Exception
	 */
	public static String doGet(String urlStr) 
	{
		URL url = null;
		HttpURLConnection conn = null;
		InputStream is = null;
		ByteArrayOutputStream baos = null;
		try
		{
			url = new URL(urlStr);
			conn = (HttpURLConnection) url.openConnection();
			conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
			conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
			conn.setRequestMethod(GET);
			conn.setRequestProperty(accept, */*);
			conn.setRequestProperty(connection, Keep-Alive);
			if (conn.getResponseCode() == 200)
			{
				is = conn.getInputStream();
				baos = new ByteArrayOutputStream();
				int len = -1;
				byte[] buf = new byte[128];

				while ((len = is.read(buf)) != -1)
				{
					baos.write(buf, 0, len);
				}
				baos.flush();
				return baos.toString();
			} else
			{
				throw new RuntimeException( responseCode is not 200 ... );
			}

		} catch (Exception e)
		{
			e.printStackTrace();
		} finally
		{
			try
			{
				if (is != null)
					is.close();
			} catch (IOException e)
			{
			}
			try
			{
				if (baos != null)
					baos.close();
			} catch (IOException e)
			{
			}
			conn.disconnect();
		}
		
		return null ;

	}

	/**
	 * 向指定 URL 發送POST方法的請求
	 * 
	 * @param url
	 *            發送請求的 URL
	 * @param param
	 *            請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
	 * @return 所代表遠程資源的響應結果
	 * @throws Exception
	 */
	public static String doPost(String url, String param) 
	{
		PrintWriter out = null;
		BufferedReader in = null;
		String result = ;
		try
		{
			URL realUrl = new URL(url);
			// 打開和URL之間的連接
			HttpURLConnection conn = (HttpURLConnection) realUrl
					.openConnection();
			// 設置通用的請求屬性
			conn.setRequestProperty(accept, */*);
			conn.setRequestProperty(connection, Keep-Alive);
			conn.setRequestMethod(POST);
			conn.setRequestProperty(Content-Type,
					application/x-www-form-urlencoded);
			conn.setRequestProperty(charset, utf-8);
			conn.setUseCaches(false);
			// 發送POST請求必須設置如下兩行
			conn.setDoOutput(true);
			conn.setDoInput(true);
			conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
			conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

			if (param != null && !param.trim().equals())
			{
				// 獲取URLConnection對象對應的輸出流
				out = new PrintWriter(conn.getOutputStream());
				// 發送請求參數
				out.print(param);
				// flush輸出流的緩沖
				out.flush();
			}
			// 定義BufferedReader輸入流來讀取URL的響應
			in = new BufferedReader(
					new InputStreamReader(conn.getInputStream()));
			String line;
			while ((line = in.readLine()) != null)
			{
				result += line;
			}
		} catch (Exception e)
		{
			e.printStackTrace();
		}
		// 使用finally塊來關閉輸出流、輸入流
		finally
		{
			try
			{
				if (out != null)
				{
					out.close();
				}
				if (in != null)
				{
					in.close();
				}
			} catch (IOException ex)
			{
				ex.printStackTrace();
			}
		}
		return result;
	}
}

如果大家在使用過程中出現什麼錯誤，或者有更好的建議，歡迎大家留言提出~~可以不斷的改進這些類~

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