Java属性文件附加新值

只是

FileWriter

FileWriter fileWritter = new FileWriter("example.properties", true);BufferedWriter bufferWritter = new BufferedWriter(fileWritter);bufferWritter.append("PROPERTES_YOUR_KEY=PROPERTES_YOUR_VALUE");bufferWritter.close();

更新资料

属性API不支持，我不确定为什么需要此功能。
您可以尝试如下：

example.properties

PROPERTIES_KEY_3=PROPERTIES_VALUE_3PROPERTIES_KEY_2=PROPERTIES_VALUE_2PROPERTIES_KEY_1=PROPERTIES_VALUE_1

程序

Properties pop = new Properties();pop.load(new FileInputStream("example.properties"));pop.put("PROPERTIES_KEY_3", "OVERWRITE_VALUE");FileOutputStream output = new FileOutputStream("example.properties");pop.store(output, "This is overwrite file");

输出

PROPERTIES_KEY_3=OVERWRITE_VALUEPROPERTIES_KEY_2=PROPERTIES_VALUE_2PROPERTIES_KEY_1=PROPERTIES_VALUE_1