Properties这个读取属性的类我站有教吗？

Question

package cn.jikexueyuan.kafka.ubas.util;

import java.util.Enumeration;

import java.util.HashMap;

import java.util.Map;

import java.util.Properties;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * @Date May 25, 2015

 * 

 * @Author dengjie

 * 

 * @Note This is the single entry point for accessing configuration properties.

 * 

 */

public class SystemConfig {

private static Properties mConfig;

private static Logger log = LoggerFactory.getLogger(SystemConfig.class);

static {

mConfig = new Properties();

try {

try {

mConfig.load(SystemConfig.class.getClassLoader().getResourceAsStream("system-config.properties"));

mConfig.load(SystemConfig.class.getClassLoader().getResourceAsStream("jdbc.properties"));

} catch (Exception exp1) {

exp1.printStackTrace();

}

log.info("Successfully loaded default properties.");

if (log.isDebugEnabled()) {

log.debug("SystemConfig looks like this ...");

String key = null;

Enumeration<Object> keys = mConfig.keys();

while (keys.hasMoreElements()) {

key = (String) keys.nextElement();

log.debug(key + "=" + mConfig.getProperty(key));

}

}

} catch (Exception e) {

e.printStackTrace();

}

}

private SystemConfig() {

}

/**

* Retrieve a property value

*/

public static String getProperty(String key) {

return mConfig.getProperty(key);

}

public static String getProperty(String key, String defaultValue) {

log.debug("Fetching property [" + key + "=" + mConfig.getProperty(key) + "]");

String value = SystemConfig.getProperty(key);

if (value == null) {

return defaultValue;

}

return value;

}

/**

* Retrieve a property as a boolean ... defaults to false if not present.

*/

public static boolean getBooleanProperty(String name) {

return getBooleanProperty(name, false);

}

/**

* Retrieve a property as a boolean with specified default if not present.

*/

public static boolean getBooleanProperty(String name, boolean defaultValue) {

String value = SystemConfig.getProperty(name);

if (value == null) {

return defaultValue;

}

return (new Boolean(value)).booleanValue();

}

/**

* Retrieve a property as a int,defaults to 0 if not present.

*/

public static int getIntProperty(String name) {

return getIntProperty(name, 0);

}

/**

* Retrieve a property as a int

*/

public static int getIntProperty(String name, int defaultValue) {

String value = SystemConfig.getProperty(name);

if (value == null) {

return defaultValue;

}

try {

return Integer.parseInt(value);

} catch (NumberFormatException e) {

return defaultValue;

}

}

/**

* 

*/

public static int[] getIntPropertyArray(String name, int[] defaultValue, String splitStr) {

String value = SystemConfig.getProperty(name);

if (value == null) {

return defaultValue;

}

try {

String[] propertyArray = value.split(splitStr);

int[] result = new int[propertyArray.length];

for (int i = 0; i < propertyArray.length; i++) {

result[i] = Integer.parseInt(propertyArray[i]);

}

return result;

} catch (NumberFormatException e) {

return defaultValue;

}

}

/**

*/

public static boolean[] getBooleanPropertyArray(String name, boolean[] defaultValue, String splitStr) {

String value = SystemConfig.getProperty(name);

if (value == null) {

return defaultValue;

}

try {

String[] propertyArray = value.split(splitStr);

boolean[] result = new boolean[propertyArray.length];

for (int i = 0; i < propertyArray.length; i++) {

result[i] = (new Boolean(propertyArray[i])).booleanValue();

}

return result;

} catch (NumberFormatException e) {

return defaultValue;

}

}

/**

*/

public static String[] getPropertyArray(String name, String[] defaultValue, String splitStr) {

String value = SystemConfig.getProperty(name);

if (value == null) {

return defaultValue;

}

try {

String[] propertyArray = value.split(splitStr);

return propertyArray;

} catch (NumberFormatException e) {

return defaultValue;

}

}

/**

*/

public static String[] getPropertyArray(String name, String splitStr) {

String value = SystemConfig.getProperty(name);

if (value == null) {

return null;

}

try {

String[] propertyArray = value.split(splitStr);

return propertyArray;

} catch (NumberFormatException e) {

return null;

}

}

/**

* Retrieve all property keys

*/

public static Enumeration<Object> keys() {

return mConfig.keys();

}

public static Map<String, String> getPropertyMap(String name) {

String[] maps = getPropertyArray(name, ",");

Map<String, String> map = new HashMap<String, String>();

try {

for (String str : maps) {

String[] array = str.split(":");

if (array.length > 1) {

map.put(array[0], array[1]);

}

}

} catch (Exception e) {

log.error("Get PropertyMap info has error,key is :" + name);

e.printStackTrace();

}

return map;

}

}

类似这样的类，不知道自己写的话应该要写哪几个方法，想系统地学一下，不知道哪里有教。。谢谢，拜托拜托~