java读取和遍历properties文件并根据key进行排序

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import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Properties;import java.util.Set;import java.util.Map.Entry;public class PropertiesUtils {        public static Map<String, String> getPropertiesFromFile(String fileName) {        try {            Map<String, String> propMap = new HashMap<String, String>();            InputStream is = PropertiesUtils.class.getResourceAsStream(fileName);            if (is != null) {                Properties props = new Properties();                props.load(is);                Set<Object> keyset = props.keySet();                for (Object object : keyset) {                    String propValue = props.getProperty(object.toString()).toString();                    propMap.put(object.toString(), propValue.toString());                }                                List<Map.Entry<String, String>> list = new ArrayList<Map.Entry<String, String>>(propMap.entrySet());                //然后通过比较器来实现排序                Collections.sort(list, new Comparator<Map.Entry<String, String>>() {                    //升序排序                    public int compare(Entry<String, String> o1, Entry<String, String> o2) {                        return o1.getKey().compareTo(o2.getKey());                    }                                    });                                propMap = new HashMap<String, String>();                                for (Map.Entry<String, String> mapping : list) {                    propMap.put(mapping.getKey(), mapping.getValue());                    System.out.println(mapping.getKey() + " = " + mapping.getValue());                }                                is.close();            }            return propMap;        }        catch (IOException e) {                        e.printStackTrace();            return null;        }            }        public static void main(String[] args) {        PropertiesUtils.getPropertiesFromFile("/PortalResource_zh_CN.properties");    }}
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