On the basis of using java properties class

The properties class inherits from hashtable and is usually used in combination with IO streams. Its most prominent feature is to write key / value as configuration attributes to the configuration file to realize configuration persistence, or read these attributes from the configuration file. The specification suffix of these configuration files is ". Properties". Represents a persistent property set.

Points to note:

Both key and value must be of string data type.

Although it inherits from hashtable, it does not use generics.

Although you can use the put method of hashtable, it is not recommended. Instead, you should use the setproperty () method.

Multiple threads can share a single properties object without external synchronization. Thread synchronization.

If you want to write the property set in the properties collection to the configuration file, use the store () method; If you want to read properties from the ". Properties" configuration file, you can use the load () method.

The following are common methods of the properties class:

Setproperty (string K, string V): call the put method of hashtable to add key / value to the properties collection. The return value is the old value corresponding to key. If there is no old value, null is returned. Note that both K and V are string types.

Getproperty (string K): get the value corresponding to the key in the properties collection.

Store (OutputStream o, string comment): write the properties property collection to the output stream O. note that the comment is essential- Load (InputStream I): from The properties in the properties configuration file are read in bytes.

Load (reader R): from The properties in the properties configuration file are read by characters.

Stringpropertynames(): returns the set set consisting of the key part in the properties collection.

The following is a simple example of adding, fetching, traversing key / value to the properties collection and using it in combination with IO streams.

The above discussion on the use of Java properties class is based on all the contents shared by Xiaobian. I hope it can give you a reference and support more programming tips.