20231106学习总结ini文件读写

INI（Initialization）文件是一种常见的配置文件格式，通常用于存储应用程序的配置信息。INI文件通常包含一系列的节（sections）和键-值对（key-value pairs）。每个节包含一组相关的键-值对。

; 这是注释
[Database]
Server = localhost
Port = 3306
Username = myuser
Password = mypassword

以下是java对INI文件的读写操作

package file.ini;

import java.io.*;
import java.util.HashMap;
import java.util.Map;

public class INIFIleReader {
    private Map<String, Map<String,String>> sections = new HashMap<>();

    public void readINIFile(String path){
        BufferedReader reader = null;
        try{
            reader = new BufferedReader(new FileReader(path));
            String line;
            String currentSection = null;
            while((line = reader.readLine()) != null){
                line = line.trim();
                //忽略#;空开头的空行、注释
                if(line.isEmpty() || line.startsWith(";") || line.startsWith("#")){
                    continue;
                }
                if (line.startsWith("[")){
                    //解析节
                    int endIndex = line.indexOf("]");
                    if(endIndex > 0){
                        currentSection = line.substring(1,endIndex);
                        sections.put(currentSection,new HashMap<>());
                    }
                }else {
                    //解析属性
                    int separatorIndex = line.indexOf("=");
                    if(separatorIndex > 0 && currentSection !=null){
                        String key = line.substring(0,separatorIndex).trim();
                        String value = line.substring(separatorIndex + 1).trim();
                        sections.get(currentSection).put(key,value);
                    }
                }
            }
        }catch (IOException e){
            try {//读写失败则新建一个ini文件
                FileWriter fileWriter = new FileWriter("config.ini");
                PrintWriter printWriter = new PrintWriter("config.ini");
                printWriter.println("[Section1]");
                printWriter.println("key1=value1");
                printWriter.println("key2=value2");
                printWriter.close();
            }catch (IOException e1){
                e1.printStackTrace();
            }
            e.printStackTrace();
        } finally {
            if (reader !=null){
                try{
                    reader.close();
                }catch (IOException e){
                    e.printStackTrace();
                }
            }
        }
    }
    
    public String getProperty(String section,String key){
        Map<String, String> properties = sections.get(section);
        if (properties !=null) {
            return properties.get(key);
        }
        return null;
    }
    //遍历Map数组
    public void ForEach(){
        sections.forEach((key,value) -> System.out.println(key + "=" +value));
    }
    
    public static void main(String[] args){
        INIFIleReader reader = new INIFIleReader();
        reader.readINIFile("config.ini");
        String value = reader.getProperty("Section1","key1");
        System.out.println(value);
        reader.ForEach();
    }

}