Java read-Write properties configuration file

I. Properties and properties configuration Files

The properties class inherits from the Hashtable class and implements the map interface, and it also holds the property set in the form of a key-value pair. However, the properties have a special place, that is, its keys and values are string types.

Two. Main methods in the properties

(1) load (inputstream instream)

     this Method can load a property list into the Properties class object from the file input stream corresponding to the. Properties property file. As in the following code:

Properties Pro = new properties (); FileInputStream in = new FileInputStream ("A.properties");p ro.load (in); In.close ();

(2) Store (OutputStream out, String comments)

& nbsp;    This method saves the property list of the Properties class object to the output stream. As in the following code:

FileOutputStream ofile = new FileOutputStream (file, "A.properties");p Ro.store (ofile, "Comment"); Ofile.close ();

If comments is not empty, the first row of the saved properties file is #comments, which represents the comment information, and if blank, no comment information.

The comment information is followed by the current save time information for the property file.

(3) Getproperty/setproperty

The two methods are to get and set property information, respectively.

three. Code Examples

Properties The file a.properties is as follows:

Name=rootpass=liukey=value

     reads the A.properties property list, with the build properties file b.properties. The code is as follows:

import java.io.bufferedinputstream;import java.io.fileinputstream;import  java.io.fileoutputstream;import java.io.inputstream; import java.util.iterator;import  java.util.properties; public class propertytest {    public  Static void main (String[] args)  {          Properties prop = new properties ();              try{            // Read the properties file A.properties            inputstream in  = new BufferedInputStream  (New fileinputstream ("A.properties"));             prop.load (in);      ///Load Property list              iterator<string> it=prop.stringpropertynames (). Iterator ();             while (It.hasnext ()) {                 string key=it.next ();                 system.out.println (key+ ":" +prop.getProperty ( Key));            }             in.close ();                         /// Save properties to b.properties file             fileoutputstream  ofile = new fileoutputstream ("B.properties",  true);//true means append open               prop.setproperty ("Phone",  "10086");             prop.store (ofile,  "The new properties file");             ofile.close ();         }        catch (exception e) {             system.out.println (e);         }     } }

Java Read-write properties configuration file