java讀取和遍歷properties文件並根據key進行排序

java讀取和遍歷properties文件並根據key進行排序

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());
                //然後通過比較器來實現排序
                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");
    }
}