获取properties文件

获取properties文件的信息

代码如下：

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * 读取配置文件信息工具类
 * 
 * @author 
 *
 */
public class PropertiesUtil {

    /**
     * 获取某配置文件的值 带默认值
     * 
     * @param url
     *            properties文件名路劲
     * @param propName
     *            获取关键字
     * @param defaultValue
     *            默认值
     * @return
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static String loadProperties(String url, String propName, String defaultValue)
            throws FileNotFoundException, IOException {
        Properties prop = new Properties();
        FileInputStream fis = null;
        try {
            fis = new FileInputStream(url);
            prop.load(fis);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        String returnValue = prop.getProperty(propName, defaultValue);
        return returnValue;
    }

    /**
     * 获取某配置文件的值 不带默认值
     * 
     * @param fileName
     *            配置文件名
     * @param key
     *            获取关键字
     * @return
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static String getProperty(String fileName, String key) {
        Properties prop = new Properties();
        InputStream in = PropertiesUtil.class.getResourceAsStream("/" + fileName);
        System.out.println(in == null ? "in=null" : in.toString());
        try {
            prop.load(in);
            String value = prop.getProperty(key);
            return value;
        } catch (IOException e) {
            e.printStackTrace();
            return "false";
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

    /**
     * 获取某配置文件的所有值
     * 
     * @param fileName
     *            配置文件名
     * @return
     * @throws FileNotFoundException
     * @throws IOException
     */
    public Properties getProperties(String fileName) {
        Properties prop = new Properties();
        InputStream in = PropertiesUtil.class.getResourceAsStream("/" + fileName);
        try {
            prop.load(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return prop;
    }

    public static void main(String[] args) throws FileNotFoundException, IOException {
        System.out.println(PropertiesUtil.getProperty("ConstVar.properties", "FILE_UPLOAD_DIR"));
    }
}

在src/main/resource/ConstVar.properties如图：

运行结果：