详解Spring Boot读取配置文件与配置文件优先级

package com.ivan.config.controller;

import org.springframework.beans.factory.annotation.autowired;

import org.springframework.context.applicationcontext;

import org.springframework.core.env.environment;

import org.springframework.web.bind.annotation.requestmapping;

import org.springframework.web.bind.annotation.requestmethod;

import org.springframework.web.bind.annotation.restcontroller;

@restcontroller

public class configcontroller {

   @autowired

   applicationcontext context;

   @autowired

   environment environment;

   @requestmapping (value= "/config" , method={requestmethod.get})

   public string getconfigcontent(){      

     string name = context.getenvironment().getproperty( "db.user.name" );

     return name;

   }

   @requestmapping (value= "/configenv" , method={requestmethod.get})

   public string getconfigenvironment(){

     string name = environment.getproperty( "db.user.name" );

     return name;

   }

}

package com.ivan.config.entity;

import org.springframework.boot.context.properties.configurationproperties;

import org.springframework.context.annotation.configuration;

import org.springframework.context.annotation.propertysource;

@configuration

@propertysource ( "classpath:config/druid.properties" )

@configurationproperties (prefix = "druid" )

public class druidconfig {

   private int   initialsize;

   private int   minidle;

   private int   maxactive;

   private int   maxwait;

   private string validationquery;

   private boolean testwhileidle;

   private boolean testonborrow;

   private boolean testonreturn;

   public int getinitialsize() {

     return initialsize;

   }

   public void setinitialsize( int initialsize) {

     this .initialsize = initialsize;

   }

   public int getminidle() {

     return minidle;

   }

   public void setminidle( int minidle) {

     this .minidle = minidle;

   }

   public int getmaxactive() {

     return maxactive;

   }

   public void setmaxactive( int maxactive) {

     this .maxactive = maxactive;

   }

   public int getmaxwait() {

     return maxwait;

   }

   public void setmaxwait( int maxwait) {

     this .maxwait = maxwait;

   }

   public string getvalidationquery() {

     return validationquery;

   }

   public void setvalidationquery(string validationquery) {

     this .validationquery = validationquery;

   }

   public boolean istestwhileidle() {

     return testwhileidle;

   }

   public void settestwhileidle( boolean testwhileidle) {

     this .testwhileidle = testwhileidle;

   }

   public boolean istestonborrow() {

     return testonborrow;

   }

   public void settestonborrow( boolean testonborrow) {

     this .testonborrow = testonborrow;

   }

   public boolean istestonreturn() {

     return testonreturn;

   }

   public void settestonreturn( boolean testonreturn) {

     this .testonreturn = testonreturn;

   }

   @override

   public string tostring() {

     return "druidconfig [initialsize=" + initialsize + ", minidle=" + minidle + ", maxactive=" + maxactive + ", maxwait=" + maxwait + ", validationquery=" + validationquery + ", testwhileidle=" + testwhileidle + ", testonborrow=" + testonborrow + ", testonreturn=" + testonreturn + "]" ;

   }

}

druid.initialsize= 5

druid.minidle= 5

druid.maxactive= 20

druid.maxwait= 60000

druid.validationquery=select 'x'

druid.testwhileidle= true

druid.testonborrow= true

druid.testonreturn= true

package com.ivan.config.controller;

import org.springframework.beans.factory.annotation.autowired;

import org.springframework.web.bind.annotation.requestmapping;

import org.springframework.web.bind.annotation.requestmethod;

import org.springframework.web.bind.annotation.restcontroller;

import com.ivan.config.entity.druidconfig;

@restcontroller

public class druidconfigcontroller {

   @autowired

   public druidconfig druidconfig;

   @requestmapping (value= "/druidconfig" , method={requestmethod.get})

   public string getdruidconfig(){

     return druidconfig.tostring();

   }

}

package com.ivan.config.entity;

import org.springframework.beans.factory.annotation.value;

import org.springframework.context.annotation.configuration;

@configuration

public class valuetest {

   @value ( "${db.user.name}" )

   private string username;

   public string getusername() {

     return username;

   }

   public void setusername(string username) {

     this .username = username;

   }

}

package com.ivan.config.controller;

import org.springframework.beans.factory.annotation.autowired;

import org.springframework.web.bind.annotation.requestmapping;

import org.springframework.web.bind.annotation.requestmethod;

import org.springframework.web.bind.annotation.restcontroller;

import com.ivan.config.entity.valuetest;

@restcontroller

public class valuecontroller {

   @autowired

   private valuetest value;

   @requestmapping (value= "/configvalue" , method={requestmethod.get})

   public string getconfig(){

     return value.getusername();

   }

}