java properties

package com.properties;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;

/**
* @author Jay
* @time 2015年8月7日
*/
public class PropertiesUtil {

public Map<String, String> load() {
Properties props = new Properties();
Map<String, String> map = new HashMap<String, String>();
try {
InputStream in = getClass().getResourceAsStream("properties.properties");
props.load(in);
Iterator<Entry<Object, Object>> it = props.entrySet().iterator();
while(it.hasNext()){
Entry<Object, Object> entry = it.next();
map.put(entry.getKey().toString(),entry.getValue().toString());
}
} catch (Exception e) {
e.printStackTrace();
}
return map;
}

public void getAll(){
Map<String, String> map = load();
Iterator<Map.Entry<String, String>> it = map.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, String> entry = it.next();
System.out.println( entry.getKey() + " = "+ entry.getValue());
}
}

public String getByKey(String key){
Map<String, String> map = load();
return map.get(key);
}

public static void main(String[] args) {
PropertiesUtil util = new PropertiesUtil();
// 获取所有
util.getAll();

// 根据key获取value
System.out.println(util.getByKey("b"));
}

}