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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 屬性文件工具類
 */
public final class PropsUtils {

    private static final Logger LOGGER = LoggerFactory.getLogger(PropsUtil.class);
    
    /**
     * 加載屬性文件
     */
    public static Properties loadProps(String fileName) {
        Properties props = null;
        InputStream is = null;
        try {
            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if (is == null) {
                throw new FileNotFoundException(fileName + " file is not found");
            }
            props = new Properties();
            props.load(is);
        } catch (IOException e) {
            LOGGER.error("load properties file failure", e);
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    LOGGER.error("close input stream failure", e);
                }
            }
        }
        return props;
    }

    /**
     * 獲取字符型屬性（默認值為空字符串）
     */
    public static String getString(Properties props, String key) {
        return getString(props, key, "");
    }

    /**
     * 獲取字符型屬性（可指定默認值）
     */
    public static String getString(Properties props, String key, String defaultValue) {
        String value = defaultValue;
        if (props.containsKey(key)) {
            value = props.getProperty(key);
        }
        return value;
    }

    /**
     * 獲取數值型屬性（默認值為 0）
     */
    public static int getInt(Properties props, String key) {
        return getInt(props, key, 0);
    }

    /**
     * 獲取數值型屬性（可指定默認值）
     */
    public static int getInt(Properties props, String key, int defaultValue) {
        int value = defaultValue;
        if (props.containsKey(key)) {
            value = CastUtil.castInt(props.getProperty(key));
        }
        return value;
    }

    /**
     * 獲取布爾型屬性（默認值為 false）
     */
    public static boolean getBoolean(Properties props, String key) {
        return getBoolean(props, key, false);
    }

    /**
     * 獲取布爾型屬性（可指定默認值）
     */
    public static boolean getBoolean(Properties props, String key, boolean defaultValue) {
        boolean value = defaultValue;
        if (props.containsKey(key)) {
            value = CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }
}

<!-- 加載配置文件 -->
<context:property-placeholder location="classpath:config.properties" />
<!-- 讀取配置文件 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="${web.view.prefix}" />
    <property name="suffix" value="${web.view.suffix}" />
</bean>