Read configuration file in Java (Properties, XML)

1. Using the tool class properties provided by Java.util
-First, I have a file.properties file on my side.
-then go to read this file

Note Project Path

//注意ProConfigUtil是当前类，也可用this替代    InputStream inputStream = PropConfigUtil.class.getClassLoader()           .getResourceAsStream("config/file.properties");     Properties pro = new Properties();    pro.load(inputStream);           String fileType = pro.getProperty("file.fileType").trim();

Full code

 PackageCom.zsl.uploadfile;ImportJava.io.IOException;ImportJava.io.InputStream;ImportJava.util.Properties;ImportOrg.apache.commons.configuration.ConfigurationException; Public Final  class imagepropconfigutil{     Public Imagepropconfigutil()    {} Public Static  class SingleTon {        Private StaticInputStream InputStream =NULL;Private StaticProperties Pro =NULL;Static{InputStream = ImagePropConfigUtil.class.getClassLoader (). getResourceAsStream ("Config/file.properties"); Pro =NewProperties ();Try{pro.load (InputStream); }Catch(IOException e)            {E.printstacktrace (); }        }    } Public StaticStringGetval(String key) {returnSingleTon.pro.getProperty (key); } Public Static void Main(string[] args)throwsConfigurationException {System.out.println ("--------------------"); String val = imagepropconfigutil.getval ("File.filetype"); System.out.println ("-------file type: \ t"+ val); }}

2. Using the jar package: Apache-commons-configuration-1.5.jar

PropertiesConfiguration prop = new PropertiesConfiguration("config/file.properties");prop.setDelimiterParsingDisabled(true);String val = prop.getProperty("image.imageType").toString();System.out.println(val);

Full code

Package Com.zsl.uploadfile;import Org.apache.commons.configuration.configurationexception;import Org.apache.commons.configuration.PropertiesConfiguration; Public classutil{ Public Util()    {} Public Static classSingle {Private StaticPropertiesconfiguration prop =NULL;Static{Try{prop =NewPropertiesconfiguration ("Config/file.properties"); Prop.setdelimiterparsingdisabled (true); }Catch(ConfigurationException e) {System. out. println (E.getmessage ());            E.printstacktrace (); }        }    } Public StaticStringGetval(String key) {Stringvalue= Single.prop.getProperty (key). ToString ();return value; } Public Static void Main(string[] args) {System. out. println (Util.getval ("File.filetype")); }}

Both of these methods can be used to read the configuration file. Compared with the more efficient reading configuration file, simulating a singleton mode, the program is only called once,

The printing results are as follows:

Read configuration file in Java (Properties, XML)