Aria/src/main/java/com/arialyy/downloadutil/Util.java

package com.arialyy.downloadutil;

import android.util.Log;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.util.Properties;

/**
 * Created by lyy on 2016/1/22.
 */
public class Util {
    private static final String TAG = "util";

    /**
     * 格式化文件大小
     *
     * @param size file.length() 获取文件大小
     * @return
     */
    public static String formatFileSize(double size) {
        double kiloByte = size / 1024;
        if (kiloByte < 1) {
            return size + "Byte(s)";
        }

        double megaByte = kiloByte / 1024;
        if (megaByte < 1) {
            BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
            return result1.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "KB";
        }

        double gigaByte = megaByte / 1024;
        if (gigaByte < 1) {
            BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
            return result2.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "MB";
        }

        double teraBytes = gigaByte / 1024;
        if (teraBytes < 1) {
            BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
            return result3.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "GB";
        }
        BigDecimal result4 = new BigDecimal(teraBytes);
        return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB";
    }
    /**
     * 创建目录 当目录不存在的时候创建文件，否则返回false
     *
     * @param path
     * @return
     */
    public static boolean createDir(String path) {
        File file = new File(path);
        if (!file.exists()) {
            if (!file.mkdirs()) {
                Log.d(TAG, "创建失败，请检查路径和是否配置文件权限！");
                return false;
            }
            return true;
        }
        return false;
    }

    /**
     * 创建文件 当文件不存在的时候就创建一个文件，否则直接返回文件
     *
     * @param path
     * @return
     */
    public static File createFile(String path) {
        File file = new File(path);
        if (!file.getParentFile().exists()) {
            Log.d(TAG, "目标文件所在路径不存在，准备创建……");
            if (!createDir(file.getParent())) {
                Log.d(TAG, "创建目录文件所在的目录失败！文件路径【" + path + "】");
            }
        }
        // 创建目标文件
        try {
            if (!file.exists()) {
                if (file.createNewFile()) {
                    Log.d(TAG, "创建文件成功:" + file.getAbsolutePath());
                }
                return file;
            } else {
                return file;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    /**
     * 设置打印的异常格式
     */
    public static String getPrintException(Throwable ex) {
        StringBuilder err = new StringBuilder();
        err.append("ExceptionDetailed:\n");
        err.append("====================Exception Info====================\n");
        err.append(ex.toString());
        err.append("\n");
        StackTraceElement[] stack = ex.getStackTrace();
        for (StackTraceElement stackTraceElement : stack) {
            err.append(stackTraceElement.toString()).append("\n");
        }
        Throwable cause = ex.getCause();
        if (cause != null) {
            err.append("【Caused by】: ");
            err.append(cause.toString());
            err.append("\n");
            StackTraceElement[] stackTrace = cause.getStackTrace();
            for (StackTraceElement stackTraceElement : stackTrace) {
                err.append(stackTraceElement.toString()).append("\n");
            }
        }
        err.append("===================================================");
        return err.toString();
    }
    /**
     * 读取下载配置文件
     *
     * @param file
     * @return
     */
    public static Properties loadConfig(File file) {
        Properties properties = new Properties();
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(file);
            properties.load(fis);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (fis != null) {
                    fis.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return properties;
    }

    /**
     * 保存配置文件
     *
     * @param file
     * @param properties
     */
    public static void saveConfig(File file, Properties properties) {
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(file, false);
            properties.store(fos, null);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (fos != null) {
                    fos.flush();
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}