log日志打印封装，并保存到本地文件

封装了本地日志，可以通过config
文件动态控制log的打印，方便上线前日志打印的检查，并且如果在测试环境下，日志等级为i以上的日志都会存文件，并且文件以日期命名，最大数量为5，可以配置。

代码如下所示：

public final class EBLog {private static final String TAG = EBLog.class.getName();/*** Define the log priority.*/private static LogType logType;private static HashMap<Integer, String> level = new HashMap<>();static {level.put(2, "verbose");level.put(3, "debug");level.put(4, "info");level.put(5, "warn");level.put(6, "error");level.put(7, "asset");if (Config.ISRELEASE) {setLogType(LogType.asset);} else {setLogType(LogType.verbose);}}private EBLog() {}/*** Get the log level.** @return log level*/public static LogType getLogType() {return logType;}/*** Set the log level for the application.** @param logType the value to be set.*/public static void setLogType(LogType logType) {EBLog.logType = logType;i(TAG, "logType: " + logType);}/*** Send a  log message.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.*/public static int v(String tag, String msg) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.verbose.value(), tag, msg,stackTraceElement);}/*** Send a  log message and log the exception.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.* @param tr  An exception to log*/public static int v(String tag, String msg, Throwable tr) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.verbose.value(), tag, msg + '\n' + getStackTraceString(tr),stackTraceElement);}/*** Send a log message.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.*/public static int d(String tag, String msg) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.debug.value(), tag, msg,stackTraceElement);}/*** Send a  log message and log the exception.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.* @param tr  An exception to log*/public static int d(String tag, String msg, Throwable tr) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.debug.value(), tag, msg + '\n' + getStackTraceString(tr),stackTraceElement);}/*** Send an log message.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.*/public static int i(String tag, String msg) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.info.value(), tag, msg,stackTraceElement);}/*** Send a log message and log the exception.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.* @param tr  An exception to log*/public static int i(String tag, String msg, Throwable tr) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.info.value(), tag, msg + '\n' + getStackTraceString(tr),stackTraceElement);}/*** Send a log message.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.*/public static int w(String tag, String msg) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.warn.value(), tag, msg,stackTraceElement);}/*** Send a log message and log the exception.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.* @param tr  An exception to log*/public static int w(String tag, String msg, Throwable tr) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.warn.value(), tag, msg + '\n' + getStackTraceString(tr),stackTraceElement);}/*** Checks to see whether or not a log for the specified tag is loggable at* the specified level. The default level of any tag is set to INFO. This* means that any level above and including INFO will be logged. Before you* make any calls to a logging method you should check to see if your tag* should be logged. You can change the default level by setting a system* property: 'setprop log.tag.&lt;YOUR_LOG_TAG> &lt;LEVEL>' Where level is* either value of LogType, or SUPPRESS. SUPRESS will turn off all logging* for your tag. You can also create a local.prop file that with the* following in it: 'log.tag.&lt;YOUR_LOG_TAG>=&lt;LEVEL>' and place that in* /data/local.prop.** @param tag   The tag to check.* @param level The level to check, value of LogType.* @return Whether or not that this is allowed to be logged.* @throws IllegalArgumentException is thrown if the tag.length() > 23.*/public static native boolean isLoggable(String tag, int level);/** Send a {@link #WARN} log message and log the exception.* * @param tag Used to identify the source of a log message. It usually* identifies the class or activity where the log call occurs.* * @param tr An exception to log*/public static int w(String tag, Throwable tr) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.warn.value(), tag, getStackTraceString(tr),stackTraceElement);}/*** Send an log message.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.*/public static int e(String tag, String msg) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.error.value(), tag, msg,stackTraceElement);}/*** Send a log message and log the exception.** @param tag Used to identify the source of a log message. It usually*            identifies the class or activity where the log call occurs.* @param msg The message you would like logged.* @param tr  An exception to log*/public static int e(String tag, String msg, Throwable tr) {StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];return ElectronicBrandPrintln(LogType.error.value(), tag, msg + "\n" + getStackTraceString(tr),stackTraceElement);}/*** Handy function to get a loggable stack trace from a Throwable** @param tr An exception to log*/private static String getStackTraceString(Throwable tr) {if (tr == null) {return "";}StringWriter sw = new StringWriter();PrintWriter pw = new PrintWriter(sw);tr.printStackTrace(pw);return sw.toString();}private static int ElectronicBrandPrintln(int priority, String tag, String msg,StackTraceElement stackTraceElement) {if (priority >= logType.value()) {if (!Config.ISRELEASE && priority >= 4) {ThreadPoolService.addTask(new LogSaveUtils(getLogInfo( priority, tag, msg,stackTraceElement)));}return android.util.Log.println(priority, tag, msg);} else {return -1;}}/*** May be verbose, debug, info, warn, error, asset.** @author coleman*/public static enum LogType {verbose(2), debug(3), info(4), warn(5), error(6), asset(7);private final int type;private LogType(int type) {this.type = type;}public int value() {return type;}public static LogType instanse(int i) {LogType type = verbose;switch (i) {case 2:type = verbose;break;case 3:type = debug;break;case 4:type = info;break;case 5:type = warn;break;case 6:type = error;break;case 7:type = asset;break;default:type = null;break;}return type;}}/*** 保存日志所包含的信息** @param tag* @param priority* @return*/private static String getLogInfo(int priority, String tag, String msg,StackTraceElement stackTraceElement) {StringBuilder logInfoStringBuilder = new StringBuilder();// 获取线程名String threadName = Thread.currentThread().getName();// 获取类名.即包名+类名String className = stackTraceElement.getClassName();// 获取方法名称String methodName = stackTraceElement.getMethodName();// 获取生日输出行数int lineNumber = stackTraceElement.getLineNumber();logInfoStringBuilder.append(GeneralUtils.getCurrentTime(Constants.YEAR_MONTH_DAY_HOUR_MINUTE_SECOND));logInfoStringBuilder.append("  [");logInfoStringBuilder.append(threadName).append("]   ");logInfoStringBuilder.append(className).append("   ");logInfoStringBuilder.append(level.get(priority)).append("/").append(tag);logInfoStringBuilder.append("   [methodName=" + methodName).append("]   ");logInfoStringBuilder.append("[lineNumber=" + lineNumber);logInfoStringBuilder.append(" ]   ");logInfoStringBuilder.append(msg);return logInfoStringBuilder.toString();}
}

线程池类代码如下：

/*** <线程池管理>** @author caoyinfei* @version [版本号, 2016/6/21]* @see [相关类/方法]* @since [V1]*/
public class ThreadPoolService {private static ExecutorService executor = Executors.newCachedThreadPool();public static void addTask(LogSaveUtils logSaveUtils){executor.execute(logSaveUtils);}
}

文件保存类代码如下：

/*** <日志文件处理类>** @author caoyinfei* @version [版本号, 2016/6/21]* @see [相关类/方法]* @since [V1]*/
public class LogSaveUtils implements Runnable {private String content;public LogSaveUtils(String content) {this.content = content;}/*** 文件最大个数*/private static final int MAX_SIZE = 5;/*** 文件名后缀*/private static String FILE_NAME = ".log";/*** 文件*/private File file;/*** 输出流*/private RandomAccessFile randomAccessFile;private SimpleDateFormat dataFormat = new SimpleDateFormat("yyyy-MM-dd");// 日志名称格式@Overridepublic void run() {saveToFile();}/*** 保存到本地文件*/private synchronized void saveToFile() {try {deleteFile();LocalFileStorageManager localFileStorageManager = BridgeFactory.getBridge(Bridges.LOCAL_FILE_STORAGE);String fileName = localFileStorageManager.getVersionLogPath() + Config.LOG_FILE_NAME + GeneralUtils.getCurrentTime(Constants.YEAR_MONTH_DAY) + FILE_NAME;file = new File(fileName);randomAccessFile = new RandomAccessFile(file, "rw");randomAccessFile.seek(file.length());randomAccessFile.write(content.getBytes("utf-8"));randomAccessFile.write("\r\n".getBytes());} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {try {randomAccessFile.close();} catch (Exception e) {}}}/*** 文件超过最大个数则删除最旧的文件*/private void deleteFile() {LocalFileStorageManager localFileStorageManager = BridgeFactory.getBridge(Bridges.LOCAL_FILE_STORAGE);File root = new File(localFileStorageManager.getVersionLogPath());if (root.isDirectory()) {File[] listFiles = root.listFiles();if (listFiles != null && listFiles.length >= MAX_SIZE) {Arrays.sort(listFiles, new FileComparator());listFiles[0].delete();}}}class FileComparator implements Comparator<File> {public int compare(File file1, File file2) {String createInfo1 = getFileNameWithoutExtension(file1.getName());String createInfo2 = getFileNameWithoutExtension(file2.getName());try {Date create1 = dataFormat.parse(createInfo1);Date create2 = dataFormat.parse(createInfo2);if (create1.before(create2)) {return -1;} else {return 1;}} catch (ParseException e) {return 0;}}}/*** 去除文件的扩展类型（.log）** @param fileName* @return*/private String getFileNameWithoutExtension(String fileName) {try {return fileName.substring(fileName.indexOf(".")+1, fileName.lastIndexOf("."));} catch (Exception e) {return "";}}}

/*** <上线前需要更改的配置文件>** @author caoyinfei* @version [版本号, 2016/6/21]* @see [相关类/方法]* @since [产品/模块版本]*/
public class Config {/*** 是否为release版本*/public static final boolean ISRELEASE = false;/*** 日志文件前缀*/public static final String LOG_FILE_NAME = "eb-p.";}

文件目录的创建代码：

    /*** <日志目录>* <功能详细描述>* @return*/public static String getVersionLogPath() {return FileUtil.createNewFile(getCacheFilePath() + FOLDER_NAME_LOG + File.separator);}

    public static String createNewFile(String path) {File dir = new File(path);if (!dir.exists()) {dir.mkdirs();}return path;}

保存的文件如下所示：

eb-p.2016-06-23.log
eb-p.2016-06-28.log

文件中的日志如下所示：

2016-06-23 16:43:17  [main]   com.test.electronicbrand.capabilities.log.EBLog   info/com.test.electronicbrand.capabilities.log.EBLog   [methodName=setLogType]   [lineNumber=90 ]   logType: verbose
2016-06-23 16:43:17  [main]   com.test.electronicbrand.ui.personcenter.LoginActivity   info/sdsd   [methodName=initData]   [lineNumber=57 ]   ssdsd
2016-06-23 16:43:17  [main]   com.test.electronicbrand.ui.personcenter.LoginActivity   info/aaa   [methodName=setHeader]   [lineNumber=64 ]   dfdf

如有错误欢迎指出来，一起学习。

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