<span style="font-family:Comic Sans MS;">package com.mstar.investmeplugin;
 
import java.util.Collections;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.Properties;
import java.util.Set;
 
/**
 * OrderedProperties
 * @author liii
 * @date 2015-07-10
 */
public class OrderedProperties extends Properties {
 
    private static final long serialVersionUID = -4627607243846121965L;
     
    private final LinkedHashSet<Object> keys = new LinkedHashSet<Object>();
 
    public Enumeration<Object> keys() {
        return Collections.<Object> enumeration(keys);
    }
 
    public Object put(Object key, Object value) {
        keys.add(key);
        return super.put(key, value);
    }
 
    public Set<Object> keySet() {
        return keys;
    }
 
    public Set<String> stringPropertyNames() {
        Set<String> set = new LinkedHashSet<String>();
 
        for (Object key : this.keys) {
            set.add((String) key);
        }
 
        return set;
    }
}</span>

<span style="font-family:Comic Sans MS;">Properties props = new OrderedProperties();
props.load(fileInputStream);
 
//通过 keys(), keySet() 或 stringPropertyNames 来遍历都能保证按文件中的顺序输出</span>

• StackOverflow
• Playframework1中的另一个实现

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