property_自己编写一个读取Property文件的Util类

读取property文件的Util类：

 

所需jar包：

编写PropertiesUtil类：

 

 

package com.west.util.property;



import java.io.InputStream;

import java.util.HashMap;

import java.util.Map;

import java.util.Properties;



import org.apache.log4j.Logger;



/**

 * 工具类： 操作Property文件

 * 

 */

public class PropertiesUtil {

    private static Logger logger = Logger.getLogger(PropertiesUtil.class);

    private static Map<String, Properties> propertyMap = new HashMap<String, Properties>();



    private static Properties objProperties = null;



    private PropertiesUtil() {

    }



    /**

     * 通过fileName、key获取value

     */

    public static String getValueByNameAndKey(String fileName, String key) {

        String rt = null;

        if (objProperties == null) {

            objProperties = gerProperties(fileName);

        }

        if (objProperties != null) {

            rt = objProperties.getProperty(key);

        }

        return rt;

    }

    

    /**

     * 通过property文件名：加载properties

     */

    public synchronized static Properties gerProperties(String fileName) {

        Properties properties = propertyMap.get(fileName);

        if (properties == null) {

            properties = new Properties();

            // 加载

            InputStream in = PropertiesUtil.class.getClassLoader()

                    .getResourceAsStream(fileName);

            System.out.println(in);

            try {

                properties.load(in);

            } catch (Exception e) {

                e.printStackTrace();

                logger.error(e);

            }

        }

        return properties;

    }

}

 

编写：message.properties文件

 

编写测试类：

package com.west.util.property;

import org.junit.Test;

public class PropertiesUtilTest {

    @Test

    public void test() {

        String value=PropertiesUtil.getValueByNameAndKey("message.properties","west");

        System.out.println(value);

    }



}