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springboot based on a series of packaging framework. QmFramework to implements AOP, rewrite the requestBody, global exception catching,version checking, request body parameter symmetric encryption mechanism, controller packaging and the toolkit collection. thank you for using it.

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package com.starmcc.qmframework.tools.file;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.Properties;

/**
 * properties工具类，默认读取config.properties配置文件
 *
 * @Author qm
 * @Date 2018年11月24日 上午2:09:11
 */
public class QmPropertiesUtil {

    /**
     * 如果需要读取其他配置文件请指定fileName的值;
     */
    public static String fileName = null;
    private static Properties properties;

    private QmPropertiesUtil() {
    }

    static {
        properties = new Properties();
        InputStreamReader inStream = null;
        try {
            // 读取properties文件,使用InputStreamReader字符流防止文件中出现中文导致乱码
            inStream = new InputStreamReader
                    (QmPropertiesUtil.class.getClassLoader().getResourceAsStream("config.properties"),
                            "UTF-8");
            properties.load(inStream);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (inStream != null) {
                try {
                    inStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }


    /**
     * 从properties文件中读取出一个key对应的value
     *
     * @param key key
     * @return value
     */
    public static String get(String key) {
        String value = properties.getProperty(key);
        return value;
    }

    /**
     * 从properties文件中读取出一个key对应的value, 如果该value为空返回默认文本
     *
     * @param key          key
     * @param defaultValue 如果获取不到返回该默认值
     * @return value
     */
    public static String get(String key, String defaultValue) {
        String value = properties.getProperty(key, defaultValue);
        if ("".equals(value.trim())) {
            value = defaultValue;
        }
        return value;
    }

    /**
     * 根据文件名读取key
     *
     * @param key      key
     * @param fileName 文件名
     * @return
     */
    public static String getValueByFileName(String key, String fileName) {
        Properties pro = new Properties();
        InputStreamReader inStream = null;
        String value = null;
        try {
            // 读取properties文件,使用InputStreamReader字符流防止文件中出现中文导致乱码
            inStream = new InputStreamReader
                    (QmPropertiesUtil.class.getClassLoader().getResourceAsStream(fileName),
                            "UTF-8");
            pro.load(inStream);
            value = pro.getProperty(key);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (inStream != null) {
                try {
                    inStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return value;
    }

}