Simple use of the Java configuration information class Properties

Properties: (Configuration information Class) is a collection that represents persistence, inherits Hashtable, and the stored value is a key-worthwhile way
Mainly used for production configuration files and read profile information.

A simple example:

1 Importjava.io.FileNotFoundException;2 ImportJava.io.FileReader;3 ImportJava.io.FileWriter;4 Importjava.io.IOException;5 ImportJava.util.Map.Entry;6 Importjava.util.Properties;7 ImportJava.util.Set;8 9  Public classProperties {Ten  One      Public Static voidMain (string[] args)throwsIOException { A Createpropert (); - Readpropert (); -     } the      -     //(i) Create the configuration information class -      Public Static voidCreatepropert ()throwsIOException { -         //1. Create an Object +Properties pt =NewProperties (); -          +         //2. Configure object information (key values are string types) APt.setproperty ("The Junior", "1101"); atPt.setproperty ("Small Two", "1102"); -Pt.setproperty ("Zhang 3", "1103"); -Pt.setproperty ("Lisi", "1104"); -          -         //3. Save the configured object files to disk (two methods are OK) -         //(1) Store (new FileWriter ("c:\\.")) A character stream is recommended if you need to write to Chinese in         //(2) Store (new FileOutputStream (c:\\.)) BYTE Stream -Pt.store (NewFileWriter ("c:\\users\\bigerf\\desktop\\ Configuration Flow. Properties"), "This is a descriptive message for the file:"); to     } +      -      the     //(ii) Read the configuration object information *      Public Static voidReadpropert ()throwsFileNotFoundException, IOException { $         //1. Create an ObjectPanax NotoginsengProperties pt =NewProperties (); -          the         //2. Read the Configuration object data according to the path load (new FileReader ("c:\\.")) +Pt.load (NewFileReader ("c:\\users\\bigerf\\desktop\\ Configuration flow. Properties")); A          the         //3. Traversing the collection (Configuration object data) +         //A collection is a loop that can be traversed through a foreach -Set<entry<object, object>> Entrys =Pt.entryset (); $          for(Entry<object, object>Entry:entrys) { $System.out.println ("Name:" +entry.getkey () + "ID:" +Entry.getvalue ()); -         } -     } the}

Printing results:

Name:    id:1101name:lisi    ID:1104Name: Small two    ID:1102Name: 3    ID:1103

Related methods:

Construction method: Properties ();//No default value

Properties (properties defaults);//Specify Default values

Configuration information: SetProperties (Key,value);//Key values are string types

Write Data:(1) Store (new FileWriter ("c:\\."), "description of configuration Information"); A character stream is recommended if you need to write to Chinese

(2) Store (new FileOutputStream (c:\\.)　　, "Description of the configuration Information"); BYTE stream

Read data: Load (new FileReader ("c:\\.")); Character Stream read

Simple use of the Java configuration information class Properties