(GO) Java read-Write properties configuration file

Original: http://www.cnblogs.com/xudong-bupt/p/3758136.html

1.Properties class and properties configuration file

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.

2.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)

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.

3. Code examples

The properties file A.properties as follows:

Name=rootpass=liukey=value

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

 1 Import Java.io.BufferedInputStream; 2 Import Java.io.FileInputStream; 3 Import Java.io.FileOutputStream;  4 Import Java.io.InputStream; 5 Import Java.util.Iterator;  6 Import java.util.Properties; 7 8 public class PropertyTest {9 public static void Main (string[] args) {ten Properties prop = new Propertie     S (); TRY{12//Read properties file A.properties13 InputStream in = new Bufferedinputstream (New FILEINPUTST     Ream ("A.properties")); Prop.load (in); Load Property list iterator<string> it=prop.stringpropertynames (). Iterator (); (It.hasnext ())             {Key=it.next String (); System.out.println (key+ ":" +prop.getproperty (key)); 19 }20 In.close (); 21 22///Save properties to b.properties file FileOutputStream ofile = New FileOutputStream ("B.properties", true);//true means append open prop.setproperty ("Phone", "10086"); PR Op.Store (ofile, "The New properties File"); Ofile.close ();}28 catch (Exception e) {29 System.out.println (e); 30}31} 32}

(GO) Java read-Write properties configuration file