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+/**
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+ * Copyright (c) 2005-2011 springside.org.cn
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+ *
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+ * $Id: PropertiesLoader.java 1690 2012-02-22 13:42:00Z calvinxiu $
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+ */
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+package com.jeeplus.sys.utils;
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+
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+import org.apache.commons.io.IOUtils;
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+import org.slf4j.Logger;
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+import org.slf4j.LoggerFactory;
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+import org.springframework.core.io.DefaultResourceLoader;
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+import org.springframework.core.io.Resource;
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+import org.springframework.core.io.ResourceLoader;
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+
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+import java.io.IOException;
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+import java.io.InputStream;
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+import java.util.NoSuchElementException;
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+import java.util.Properties;
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+
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+/**
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+ * 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.
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+ * @author calvin
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+ * @version 2013-05-15
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+ */
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+public class PropertiesLoader {
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+
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+ private static Logger logger = LoggerFactory.getLogger(PropertiesLoader.class);
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+
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+ private static ResourceLoader resourceLoader = new DefaultResourceLoader();
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+
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+ private final Properties properties;
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+
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+ public PropertiesLoader(String... resourcesPaths) {
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+ properties = loadProperties(resourcesPaths);
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+ }
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+
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+ public Properties getProperties() {
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+ return properties;
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+ }
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+
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+ /**
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+ * 取出Property,但以System的Property优先,取不到返回空字符串.
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+ */
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+ private String getValue(String key) {
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+ String systemProperty = System.getProperty(key);
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+ if (systemProperty != null) {
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+ return systemProperty;
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+ }
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+ if (properties.containsKey(key)) {
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+ return properties.getProperty(key);
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+ }
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+ return "";
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+ }
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+
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+ /**
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+ * 取出String类型的Property,但以System的Property优先,如果都为Null则抛出异常.
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+ */
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+ public String getProperty(String key) {
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+ String value = getValue(key);
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+ if (value == null) {
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+ throw new NoSuchElementException();
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+ }
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+ return value;
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+ }
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+
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+ /**
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+ * 取出String类型的Property,但以System的Property优先.如果都为Null则返回Default值.
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+ */
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+ public String getProperty(String key, String defaultValue) {
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+ String value = getValue(key);
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+ return value != null ? value : defaultValue;
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+ }
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+
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+ /**
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+ * 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.
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+ */
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+ public Integer getInteger(String key) {
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+ String value = getValue(key);
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+ if (value == null) {
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+ throw new NoSuchElementException();
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+ }
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+ return Integer.valueOf(value);
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+ }
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+
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+ /**
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+ * 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
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+ */
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+ public Integer getInteger(String key, Integer defaultValue) {
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+ String value = getValue(key);
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+ return value != null ? Integer.valueOf(value) : defaultValue;
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+ }
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+
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+ /**
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+ * 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.
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+ */
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+ public Double getDouble(String key) {
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+ String value = getValue(key);
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+ if (value == null) {
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+ throw new NoSuchElementException();
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+ }
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+ return Double.valueOf(value);
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+ }
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+
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+ /**
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+ * 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
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+ */
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+ public Double getDouble(String key, Integer defaultValue) {
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+ String value = getValue(key);
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+ return value != null ? Double.valueOf(value) : defaultValue;
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+ }
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+
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+ /**
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+ * 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.
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+ */
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+ public Boolean getBoolean(String key) {
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+ String value = getValue(key);
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+ if (value == null) {
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+ throw new NoSuchElementException();
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+ }
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+ return Boolean.valueOf(value);
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+ }
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+
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+ /**
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+ * 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.
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+ */
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+ public Boolean getBoolean(String key, boolean defaultValue) {
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+ String value = getValue(key);
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+ return value != null ? Boolean.valueOf(value) : defaultValue;
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+ }
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+
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+ /**
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+ * 载入多个文件, 文件路径使用Spring Resource格式.
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+ */
|
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+ private Properties loadProperties(String... resourcesPaths) {
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+ Properties props = new Properties();
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+
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+ for (String location : resourcesPaths) {
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+
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+// logger.debug("Loading properties file from:" + location);
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+
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+ InputStream is = null;
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+ try {
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+ Resource resource = resourceLoader.getResource(location);
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+ is = resource.getInputStream();
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+ props.load(is);
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+ } catch (IOException ex) {
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+ logger.info("Could not load properties from path:" + location + ", " + ex.getMessage());
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+ } finally {
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+ IOUtils.closeQuietly(is);
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+ }
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+ }
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+ return props;
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+ }
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+}
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