java ini配置工具类 -复制工具类即可使用

package 这里写你工具类包存放的地址

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URLDecoder;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 说明：ini文件读写操作工具类
 * 作者：FH Admin
 * from：fhadmin.cn
 */
public class IniFileUtil {

    /**
     * 从ini配置文件中读取变量的值
     * @param file         配置文件的路径
     * @param section      要获取的变量所在段名称
     * @param variable     要获取的变量名称
     * @param defaultValue 变量名称不存在时的默认值
     * @return 变量的值
     * @throws IOException 抛出文件操作可能出现的io异常
     */
    public static String readCfgValue(String file, String section, String variable, String defaultValue)
       throws IOException {
       String strLine, value = "";
       BufferedReader bufferedReader = new BufferedReader(new FileReader(URLDecoder.decode(file, "UTF-8"))); //解决中文路径乱码
       boolean isInSection = false;
       try {
          while ((strLine = bufferedReader.readLine()) != null) {
             strLine = strLine.trim();
             strLine = strLine.split("[;]")[0];
             Pattern p;
             Matcher m;
             p = Pattern.compile("\\[\\w+]");// Pattern.compile("file://[//s*.*//s*//]");
             m = p.matcher((strLine));
             if (m.matches()) {
                p = Pattern.compile("\\[" + section + "\\]");// Pattern.compile("file://[//s*" + section +
                // "file://s*//]");
                m = p.matcher(strLine);
                if (m.matches()) {
                   isInSection = true;
                } else {
                   isInSection = false;
                }
             }
             if (isInSection == true) {
                strLine = strLine.trim();
                String[] strArray = strLine.split("=");
                if (strArray.length == 1) {
                   value = strArray[0].trim();
                   if (value.equalsIgnoreCase(variable)) {
                      value = "";
                      return value;
                   }
                } else if (strArray.length == 2) {
                   value = strArray[0].trim();
                   if (value.equalsIgnoreCase(variable)) {
                      value = strArray[1].trim();
                      return value;
                   }
                } else if (strArray.length > 2) {
                   value = strArray[0].trim();
                   if (value.equalsIgnoreCase(variable)) {
                      value = strLine.substring(strLine.indexOf("=") + 1).trim();
                      return value;
                   }
                }
             }
          }
       } finally {
          bufferedReader.close();
       }
       return defaultValue;
    }

    /**
     * 修改ini配置文件中变量的值
     * @param file     配置文件的路径
     * @param section  要修改的变量所在段名称
     * @param variable 要修改的变量名称
     * @param value    变量的新值
     * @throws IOException 抛出文件操作可能出现的io异常
     */
    public static boolean writeCfgValue(String file, String section, String variable, String value) throws IOException {
       String fileContent, allLine, strLine, newLine;
       String getValue = null;
       BufferedReader bufferedReader = new BufferedReader(new FileReader(URLDecoder.decode(file, "UTF-8"))); //解决中文路径乱码
       boolean isInSection = false;
       boolean canAdd = true;
       fileContent = "";
       try {

          while ((allLine = bufferedReader.readLine()) != null) {
             allLine = allLine.trim();
             strLine = allLine.split(";")[0];
             Pattern p;
             Matcher m;
             p = Pattern.compile("\\[\\w+]");
             m = p.matcher((strLine));
             if (m.matches()) {
                p = Pattern.compile("\\[" + section + "\\]");
                m = p.matcher(strLine);
                if (m.matches()) {
                   isInSection = true;
                } else {
                   isInSection = false;
                }
             }
             if (isInSection == true) {
                strLine = strLine.trim();
                String[] strArray = strLine.split("=");
                getValue = strArray[0].trim();
                if (getValue.equalsIgnoreCase(variable)) {
                   newLine = getValue + "=" + value;
                   fileContent += newLine;
                   while ((allLine = bufferedReader.readLine()) != null) {
                      fileContent += "\r\n" + allLine;
                   }
                   bufferedReader.close();
                   canAdd = false;
                   BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file, false));
                   bufferedWriter.write(fileContent);
                   bufferedWriter.flush();
                   bufferedWriter.close();

                   return true;
                }

             }
             fileContent += allLine + "\r\n";
          }
          if (canAdd) {
             String str = variable + "=" + value;
             fileContent += str + "\r\n";
             BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(file, false));
             bufferedWriter.write(fileContent);
             bufferedWriter.flush();
             bufferedWriter.close();
          }
       } catch (IOException ex) {
          throw ex;
       } finally {
          bufferedReader.close();
       }
       return false;
    }

    public static void main(String[] args) {
       try {
          /*;文件事例
          [Client]
          ;客户端版本号
          version=0001
          ;设备号
          devNum=6405*/
          String value = IniFileUtil.readCfgValue("L:/a.ini", "Client", "devNum", "1");
          System.out.println(value);
       } catch (IOException e) {
          e.printStackTrace();
       }
    }

}



参考腾讯云大佬：java 读写 ini 配置文件-腾讯云开发者社区-腾讯云 (tencent.com)