java对properties文件的操作 - Scripts 学盟

a. 通过 InputStream inputstream = ClassLoader.getSystemResourceAsStream("info.properties");
b. 通过 InputStream inputstream = this.getClass().getResourceAsStream("/info.properties");

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Properties properties = new Properties();
InputStream inputstream = ClassLoader.getSystemResourceAsStream("info.properties");
// InputStream inputstream = this.getClass().getResourceAsStream("/info.properties");
properties.load(inputstream);

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Enumeration<String> enumvalue = (Enumeration<String>) properties.propertyNames();// 返回属性列表中所有键的枚举，如果在主属性列表中未找到同名的键，则包括默认属性列表中不同的键
while (enumvalue.hasMoreElements())
{
String key = enumvalue.nextElement();
System.out.println(key + " : " + properties.getProperty(key));
}
c. 向资源文件中添加键值信息，如果key值相同就会将原有的信息覆盖
Java代码
URL url = ClassLoader.getSystemResource("info.properties");
File file = new File(url.toURI());
InputStream is = new FileInputStream(file);
properties.load(is);
properties.setProperty("key", "value");
OutputStream fos = new FileOutputStream(file);
properties.store(fos, null);
fos.flush();
is.close();
d. 删除相关的键值对
Java代码
File file = new File(ClassLoader.getSystemResource("info.properties").toURI());
InputStream is = new FileInputStream(file);
properties.load(is);
properties.remove("key");
OutputStream fos = new FileOutputStream(file);
properties.store(fos, null);
is.close();
fos.flush();
fos.close();File file = new File(ClassLoader.getSystemResource("info.properties").toURI());
InputStream is = new FileInputStream(file);
properties.load(is);
properties.remove("key");
OutputStream fos = new FileOutputStream(file);
properties.store(fos, null);
is.close();
fos.flush();
fos.close();

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