Spring boot中使用工具类 无需注入获取properties 中的值

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

import java.io.IOException;
import java.util.MissingResourceException;

@Component
public final class PropertiesUtil {

    public static final byte[] KEY = { 9, -1, 0, 5, 39, 8, 6, 19 };
    private static Environment env;

    @Autowired
    protected void set(Environment env) throws IOException {
        PropertiesUtil.env = env;
    }

    /**
     * Get a value based on key , if key does not exist , null is returned
     * 
     * @param key
     * @return
     */
    public static String getString(String key) {
        try {
            return env.getProperty(key);
        } catch (MissingResourceException e) {
            return null;
        }
    }

    /**
     * Get a value based on key , if key does not exist , null is returned
     * 
     * @param key
     * @return
     */
    public static String getString(String key, String defaultValue) {
        try {
            String value = env.getProperty(key);
            if (value == null) {
                return defaultValue;
            }
            return value;
        } catch (MissingResourceException e) {
            return defaultValue;
        }
    }

    /**
     * 根据key获取值
     * 
     * @param key
     * @return
     */
    public static int getInt(String key) {
        return Integer.parseInt(env.getProperty(key));
    }

    /**
     * 根据key获取值
     * 
     * @param key
     * @param defaultValue
     * @return
     */
    public static int getInt(String key, int defaultValue) {
        String value = env.getProperty(key);
        if (StringUtils.isBlank(value)) {
            return defaultValue;
        }
        return Integer.parseInt(value);
    }

    /**
     * 根据key获取值
     * 
     * @param key
     * @param defaultValue
     * @return
     */
    public static boolean getBoolean(String key, boolean defaultValue) {
        String value = env.getProperty(key);
        if (StringUtils.isBlank(value)) {
            return defaultValue;
        }
        return new Boolean(value);
    }
}

使用

参考：https://blog.csdn.net/u011249282/article/details/80213880