JAVA，读写properties文件

代码如下：properties工具类

package com.java.app01;

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Properties;
import java.util.Set;

public class PropertiesUtil {
    public static void main(String[] args) {
        Properties properties = readProperties("src/main/resources/account.properties");
        String pwd2 = properties.getProperty("pwd2");
        System.out.println(pwd2);

        HashMap<String, String> map = new HashMap<>();
        map.put("user1", "pwd1");
        map.put("user2", "pwd2");
        writeProperties(map,"src/main/resources/account1.properties");

    }

    // 读取properties文件
    public static Properties readProperties(String readFilePath) {
        Properties properties = new Properties();
        File file = new File(readFilePath);
        if (!file.exists()) {
            System.out.println("输入文件路径不存在");
            return null;
        }
        FileReader reader = null;
        try {
            reader = new FileReader(readFilePath);
            properties.load(reader);
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            return properties;
        }

    }
    // 写入properties文件，参数传文件路径和map数据
    public static void writeProperties(HashMap<String, String> mapData,String writeFilePath) {
        Properties properties = new Properties();
        File file = new File(writeFilePath);
        if (!file.exists()) {
            System.out.println("输入文件路径不存在");
            return;
        }
        try {
            Set<String> set = mapData.keySet();
            for (String key : set) {
                String value = mapData.get(key);
                properties.setProperty(key, value);
            }
            FileWriter writer = new FileWriter(writeFilePath);
            properties.store(writer, "data");
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}