Apache Commons Configuration

        <dependency>
            <groupId>commons-configuration</groupId>
            <artifactId>commons-configuration</artifactId>
            <version>1.10</version>
        </dependency>

public void editIni() {
    String iniFilePath = "xxx";
    try {
        //创建文件对象
        HierarchicalINIConfiguration hierarchicalINIConfiguration = new HierarchicalINIConfiguration(iniFilePath);
        //获取指定节点对象
        SubnodeConfiguration section = hierarchicalINIConfiguration.getSection("xx");
        //编辑指定key
        section.setProperty("xx", "8");
        //保存修改
        hierarchicalINIConfiguration.save();
    } catch (ConfigurationException e) {
        e.printStackTrace();
    }
}

Apache Commons Configuration2

	<dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-configuration2</artifactId>
        <version>2.9.0</version>
     </dependency>
      <dependency>
           <groupId>commons-beanutils</groupId>
           <artifactId>commons-beanutils</artifactId>
           <version>1.9.4</version> 
       </dependency>

public void editIni() {
    String filename = "xxxx";
    // 默认直接读取类路径下的配置文件
    try {	Configurations configs = new Configurations();
        INIConfiguration ini = configs.ini(new File(filename));
        SubnodeConfiguration section = ini.getSection("xxx");
        section.setProperty("xx","5");
        FileWriter fileWriter = new FileWriter(filename);
        ini.write(fileWriter);
        fileWriter.close();
        ini.clear();
    } catch (Exception e) {
        // Something went wrong
        e.printStackTrace();
    }
}