java 操作配置文件代码

以下是Java中操作配置文件的代码示例：

读取配置文件：

Properties props = new Properties();
try {
    InputStream in = new BufferedInputStream(new FileInputStream("config.properties"));
    props.load(in);
    in.close();
} catch (IOException e) {
    e.printStackTrace();
}

String value1 = props.getProperty("key1");
String value2 = props.getProperty("key2");

写入配置文件：

Properties props = new Properties();
try {
    OutputStream out = new FileOutputStream("config.properties");
    props.setProperty("key1", "value1");
    props.setProperty("key2", "value2");
    props.store(out, "This is a configuration file.");
    out.close();
} catch (IOException e) {
    e.printStackTrace();
}

更新配置文件：

Properties props = new Properties();
try {
    InputStream in = new BufferedInputStream(new FileInputStream("config.properties"));
    props.load(in);
    in.close();
} catch (IOException e) {
    e.printStackTrace();
}

props.setProperty("key1", "new_value1");

try {
    OutputStream out = new FileOutputStream("config.properties");
    props.store(out, "This is a configuration file.");
    out.close();
} catch (IOException e) {
    e.printStackTrace();
}

删除配置文件中的一个属性：

Properties props = new Properties();
try {
    InputStream in = new BufferedInputStream(new FileInputStream("config.properties"));
    props.load(in);
    in.close();
} catch (IOException e) {
    e.printStackTrace();
}

props.remove("key1");

try {
    OutputStream out = new FileOutputStream("config.properties");
    props.store(out, "This is a configuration file.");
    out.close();
} catch (IOException e) {
    e.printStackTrace();
}