Java更改.properties文件

Question

Properties prop = new Properties();

FileOutputStream oFile = new FileOutputStream("systemConfig.properties", true);
prop.setProperty("a", 1);
prop.store(oFile, "The New properties file");
oFile.close();

    这样子没修改成功！文件路径也没报错

Answer 1

这样写试一下；

Properties prop = new Properties();

FileInputStream oFile = new FileInputStream("systemConfig.properties");
prop.load(oFile);
prop.setProperty("a", 1);
prop.store(new FileOutputStream("systemConfig.properties"), "The New properties file");
oFile.close();