按节点取出.properties中的数据问题 有点小挑战

Question

pro.properties文件配置如下
[Default]
team = happy team

[Project]
Dev = Harry
From = %team%
age = 20
Des = %Dev%, from %From%, %age% yeas old

用什么办法可以按节点将其中的数据取出？
范例：
getString(Project,Des)意思取出节点Project下的Des 结果为：Harry,from Happy Team ,20 years old
getInteger(Project,age)意思是取出节点Project下的age 结果为：20
求老师指点一下

Answer 1

代码如下，先解析文件再保存：

 import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class FileParser {
    private HashMap<String,HashMap<String, String>> dataHashMap;
    private String filePath;
    private String patternString="%[A-Za-z]+%";
    private Pattern pattern=Pattern.compile(patternString);
    public FileParser(String filePath){
        this.filePath=filePath;
        dataHashMap=new HashMap<String,HashMap<String,String>>();
    }
    public String getString(String nodeKey,String valueKey){
        Set<String> nodeKeys=dataHashMap.keySet();
        for(String key:nodeKeys){
            if(key.equals(nodeKey)){
                HashMap<String,String> map=dataHashMap.get(key);
                return map.get(valueKey);
            }
        }
        return null;
    }
    public int getInteger(String nodeKey,String valueKey){
        Set<String> nodeKeys=dataHashMap.keySet();
        for(String key:nodeKeys){
            if(key.equals(nodeKey)){
                HashMap<String,String> map=dataHashMap.get(key);
                return Integer.parseInt(map.get(valueKey));
            }
        }
        return -1;
    }
    public void parse(){
        try {
            boolean isNewNode=false;
            FileReader reader=new FileReader(filePath);
            BufferedReader buf=new BufferedReader(reader);
            String str=null;
            String nodeKey=null;
            while((str=buf.readLine())!=null){
                if(str.startsWith("[")){ //新的节点
                    isNewNode=true;
                    nodeKey=str.substring(str.indexOf("[")+1,str.indexOf("]")); 
                    HashMap<String,String> map=new HashMap<String,String>();
                    dataHashMap.put(nodeKey, map);
                }
                if(!isNewNode){
                    HashMap<String,String> detail=dataHashMap.get(nodeKey);
                    String detailKey=str.substring(0,str.indexOf("=")).trim();
                    String detailValue=str.substring(str.indexOf("=")+1).trim();
                    String newDetailValue=null;
                    if(detailValue.contains("%")){ //因为可能包含%
                        Matcher matcher=pattern.matcher(detailValue);
                        while(matcher.find()){              
                            String matchString=matcher.group();
                            String keyString=matchString.replace("%","");
                            String valueString=null;
                            Set<String> keysSet=dataHashMap.keySet();
                            for(String key:keysSet){
                                HashMap<String,String> nodeValueMap=dataHashMap.get(key);
                                valueString=nodeValueMap.get(keyString);
                                if(valueString!=null)
                                    break;
                            }
                            newDetailValue=detailValue.replaceFirst(matchString, valueString);
                            detailValue=newDetailValue;
                            matcher=pattern.matcher(detailValue);
                        }
                    }
                    detail.put(detailKey, detailValue);
                }
                isNewNode=false;
            }
            buf.close();
            reader.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("保存的数据为："+dataHashMap);
    }
    /**
     * @param args
     */
    public static void main(String[] args) {
        FileParser fileParser=new FileParser("D:\\pro.properties");
        fileParser.parse();
        System.out.println(fileParser.getString("Project","Des"));
        System.out.println(fileParser.getInteger("Project", "age"));
    }

}

结果如下：