标签java

java读取properties文件的当前路径

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class PropertiesUtil {
    static Logger logger = LoggerFactory.getLogger(PropertiesUtil.class);
     Properties memProperties = null;
    static String CONFIG_FILE = "zkManager.properties";
    public  PropertiesUtil(String confFile) {
        CONFIG_FILE = confFile;
    }
    /**
     * 通过key获取配置值
     * @param key
     * @return
     * @throws Exception
     */
    public  String getProperty(String key) throws Exception {
        return getProperty(key, null);
    }
    public   String getProperty(String key, String defaultVl) throws Exception {
        if (null == memProperties) {
            logger.info("The memProperties is empty ,read properties from " + CONFIG_FILE);
            memProperties = loadPropertiesFromFile(null);
        }
        String value = memProperties.getProperty(key, defaultVl);
        if (null == value) {
            String info = "Cannot get valid value for the key:" + key + " from file " + CONFIG_FILE;
            throw new Exception(info);
        }  
        return value;
    }
    /**
     * 读取配置文件
     * @param fileName:配置文件名称
     * @return
     */
    protected  Properties loadPropertiesFromFile(String fileName) throws Exception {
        if (fileName == null || fileName.isEmpty()) {
            fileName = CONFIG_FILE;
        }
        //获取当前路径
        String localPath = this.getClass().getClassLoader().getResource(".").getPath();
        int idx = localPath.indexOf(":") + 1;
        localPath = localPath.substring(idx);
        logger.info("loadPropertiesFromFile, the target file path : " + localPath);
        memProperties = new Properties();
        FileInputStream in = null;
        try {
            String filePathName = localPath + fileName;
            in = new FileInputStream(filePathName);
            memProperties.load(in);
        } catch (Exception ex) {
            logger.error("Error occured when reading the properties file：" + localPath, ex);
            throw ex;
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (Exception ex) {
                    //
                }
                in = null;
            }
        }
        return memProperties;
    }
    public static void main(String[] args) throws Exception {
        PropertiesUtil propUtil = new PropertiesUtil(CONFIG_FILE);
        //获得配置文件中的keyname所对应的值
        String str = propUtil.getProperty(keyname)
    }
}