Four common ways to read a configuration file in Java

Configuration file
Placed under SRC obj.properties

Classname=com.store.order.dao.impl.orderdaoimpl

Way One

@Test Public void test1() throws exception{//files are placed under SRC. Eclipse will automatically copy one to the bin directory, or below the build/classes,InputStream is= Class.forName ("Com.store.test.test"). getClassLoader (). getResourceAsStream ("Obj.properties"); Properties Properties =NewProperties (); Properties.load ( is); String className = Properties.getproperty ("ClassName"); System. out. println (ClassName); }
  
 

   
  
 
   
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Way Two

    /** * Deprecated, file location is fixed, can only be used in this machine, we copy the class file to others can not use the * @throws Exception * *    @Test     Public void test2()throwsexception{FileInputStream FIS =NewFileInputStream ("D:\\workspaces\\store_v1.0\\src\\obj.properties"); Properties Properties =NewProperties ();        Properties.load (FIS); String className = Properties.getproperty ("ClassName");    System.out.println (ClassName); }
  
 

   
  
 
   
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Mode three

    @Test     Public void test3()throwsexception{//Read config file, only read default suffix named properties (not written)        //If there is a package, the notation is com.store.obj        //detail: He can only read files under Classpath path, cannot writeResourceBundle bundle = Resourcebundle.getbundle ("obj"); String className = bundle.getstring ("ClassName");//Get value by keySystem.out.println (ClassName); }
  
 

   
  
 
   
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Mode Four

/** * Spring provides propertiesloaderutils allows you to load a property resource directly from a file address based on a classpath * The greatest benefit is that the configuration file is loaded in real-time, it takes effect immediately after the modification, and does not have to restart */  Private Static void Springutil() {Properties props =NewProperties (); while(true){Try{Props=propertiesloaderutils.loadallproperties ("Message.properties"); for(Object Key:props.keySet ()) {System.out.print (key+":");              System.out.println (Props.get (key)); }          }Catch(IOException e)          {System.out.println (E.getmessage ()); }Try{Thread.Sleep ( the);}Catch(Interruptedexception e)      {E.printstacktrace ();} }  }
  
 

   
  

  
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Four common ways to read a configuration file in Java