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- package com.core.bean.memcache.util;
- 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) {
- 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;
- }
- }
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