Java-Properties文件读取工具类

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

/**
 * @ClassName: ReadPropertiesUtil
 */
public class ReadPropertiesUtil {
    // 声明配置文件
    private static String[] confProps = { "config.properties" };
    private static PropertiesConfiguration conf = null;

    /**
     * 获取所有配置对象
     */
    public static PropertiesConfiguration getConf() {
        conf = new PropertiesConfiguration();// 初始化对象
        /* 把所有props配置文件一次加载,共后续使用 */
        for (int i = 0; i < confProps.length; i++) {
            try {
                conf.load(confProps[i]);
            } catch (ConfigurationException e) {
                conf = null;
            }
        }
        return conf;
    }

    /*
     * PropsUtil getInt()
     */
    public static Integer getInt(String key) {
        /** 声明返回值 **/
        Integer value = null;
        try {
            /* 获取value值 */
            conf = getConf();
            value = conf.getInt(key);
        } catch (Exception e) {
        }
        return value;
    }

    /*
     * PropsUtil getString()
     */
    public static String getString(String key) {
        /** 声明返回值 **/
        String value = null;
        try {
            /* 获取value值 */
            conf = getConf();
            value = conf.getString(key);
        } catch (Exception e) {
        }
        return value;
    }

    /*
     * PropsUtil getLong()
     */
    public static Long getLong(String key) {
        /** 声明返回值 **/
        Long value = null;
        try {
            /* 获取value值 */
            conf = getConf();
            value = conf.getLong(key);
        } catch (Exception e) {
        }
        return value;
    }

    /*
     * PropsUtil getBoolean()
     */
    public static boolean getBoolean(String key) {
        /** 声明返回值 **/
        boolean value = true;
        try {
            /* 获取value值 */
            conf = getConf();
            value = conf.getBoolean(key);
        } catch (Exception e) {
            value = false;
        }
        return value;
    }

    /*
     * PropsUtil getList()
     */
    public static String[] getStringArray(String key) {
        /** 声明返回值 **/
        String[] value = null;
        try {
            /* 获取value值 */
            conf = getConf();
            value = conf.getStringArray(key);
        } catch (Exception e) {
        }
        return value;
    }

    /*
     * PropsUtil getJsonHeaders()
     */
    public static JSONObject getJsonHeaders(String key) {
        JSONObject json = null;// 声明返回值
        try {
            /** 解析*.Properties文件 **/
            conf = getConf();
            String value = conf.getString(key).replace("=", ",");
            json = JSON.parseObject(value);
        } catch (Exception e) {
        }
        return json;
    }

    public static void main(String[] args) throws Exception {

        System.out.println(getString("dbcp.url"));

        // String[] tmp = getStringArray("Email_to");
        // for(String to:tmp){
        // System.out.println(to);
        // }

        // JSONObject json = getJsonHeaders("httpHead");
        // for(Entry<String, Object> entry:json.entrySet()){
        // System.out.println(entry.getKey() + "-----" + entry.getValue().toString());
        // }

        // System.out.println(getInt("dbcp.url"));

        // System.out.println(getInt("redis.minIdle"));
        // String[] tmp = getStringArray("redis.redisSlaveIp");
        // for(int i=0;i<tmp.length;i++){
        // System.out.println(tmp[i].split(":")[0]);
        // System.out.println(tmp[i].split(":")[1]);
        // }
    }
}

//相关依赖
        <!-- commons-configuration -->
        <dependency>
            <groupId>commons-configuration</groupId>
            <artifactId>commons-configuration</artifactId>
            <version>1.9</version>
        </dependency>
        <!-- fastjson json -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.7</version>
        </dependency>

 Properties文件载入工具类:

　　依赖spring等。

　　

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.7</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.7</version>
        </dependency>

import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;
import java.util.Properties;

import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;

/**
 * Properties文件载入工具类. 可载入多个properties文件,
 * 相同的属性在最后载入的文件中的值将会覆盖之前的值，但以System的Property优先.
 */
public class PropertiesLoader {
    private static Logger logger = LoggerFactory.getLogger(PropertiesLoader.class);
    private static ResourceLoader resourceLoader = new DefaultResourceLoader();
    private final Properties properties;

    public PropertiesLoader(String... resourcesPaths) {
        properties = loadProperties(resourcesPaths);
    }
    
    public Properties getProperties() {
        return properties;
    }

    /**
     * 取出Boolean类型的Property，但以System的Property优先.如果都为Null抛出异常,如果内容不是true/false则返回false.
     */
    public Boolean getBoolean(String key) {
        String value = getValue(key);
        if (value == null) {
            throw new NoSuchElementException();
        }
        return Boolean.valueOf(value);
    }

    /**
     * 取出Boolean类型的Property，但以System的Property优先.如果都为Null则返回Default值,如果内容不为true/false则返回false.
     */
    public Boolean getBoolean(String key, boolean defaultValue) {
        String value = getValue(key);
        return value != null ? Boolean.valueOf(value) : defaultValue;
    }

    /**
     * 取出Double类型的Property，但以System的Property优先.如果都为Null或内容错误则抛出异常.
     */
    public Double getDouble(String key) {
        String value = getValue(key);
        if (value == null) {
            throw new NoSuchElementException();
        }
        return Double.valueOf(value);
    }

    /**
     * 取出Double类型的Property，但以System的Property优先.如果都为Null则返回Default值，如果内容错误则抛出异常
     */
    public Double getDouble(String key, Integer defaultValue) {
        String value = getValue(key);
        return value != null ? Double.valueOf(value) : defaultValue;
    }

    /**
     * 取出Integer类型的Property，但以System的Property优先.如果都为Null或内容错误则抛出异常.
     */
    public Integer getInteger(String key) {
        String value = getValue(key);
        if (value == null) {
            throw new NoSuchElementException();
        }
        return Integer.valueOf(value);
    }

    /**
     * 取出Integer类型的Property，但以System的Property优先.如果都为Null则返回Default值，如果内容错误则抛出异常
     */
    public Integer getInteger(String key, Integer defaultValue) {
        String value = getValue(key);
        return value != null ? Integer.valueOf(value) : defaultValue;
    }

    /**
     * 取出String类型的Property，但以System的Property优先,如果都为Null则抛出异常.
     */
    public String getProperty(String key) {
        String value = getValue(key);
        if (value == null) {
            throw new NoSuchElementException();
        }
        return value;
    }

    /**
     * 取出String类型的Property，但以System的Property优先.如果都为Null则返回Default值.
     */
    public String getProperty(String key, String defaultValue) {
        String value = getValue(key);
        return value != null ? value : defaultValue;
    }

    /**
     * 取出Property，但以System的Property优先,取不到返回空字符串.
     */
    private String getValue(String key) {
        String systemProperty = System.getProperty(key);
        if (systemProperty != null) {
            return systemProperty;
        }
        if (properties.containsKey(key)) {
            return properties.getProperty(key);
        }
        return "";
    }

    /**
     * 载入多个文件, 文件路径使用Spring Resource格式.
     */
    private Properties loadProperties(String... resourcesPaths) {
        Properties props = new Properties();
        for (String location : resourcesPaths) {
            InputStream is = null;
            try {
                Resource resource = resourceLoader.getResource(location);
                is = resource.getInputStream();
                props.load(is);
            } catch (IOException ex) {
                logger.info("Could not load properties from path:" + location + ", " + ex.getMessage());
            } finally {
                IOUtils.closeQuietly(is);
            }
        }
        return props;
    }
}