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jeeplus-modules/jeeplus-system/src/main/java/com/jeeplus/sys/utils/PropertiesLoader.java

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+/**
+ * Copyright (c) 2005-2011 springside.org.cn
+ * 
+ * $Id: PropertiesLoader.java 1690 2012-02-22 13:42:00Z calvinxiu $
+ */
+package com.jeeplus.sys.utils;
+
+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;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.NoSuchElementException;
+import java.util.Properties;
+
+/**
+ * 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.
+ * @author calvin
+ * @version 2013-05-15
+ */
+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 "";
+	}
+
+	/**
+	 * 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;
+	}
+
+	/**
+	 * 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) {
+
+//			logger.debug("Loading properties file from:" + location);
+
+			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;
+	}
+}