spring boot学习2之properties配置文件读取

      在spring boot学习1 时，知道spring boot会默认读取配置application.properties。那如果我们直接在application.properties添加自定义的配置项时，如何读取？或者不想把所有的配置都放在application.properties中，而是自定义一个properties文件时，又该如何读取呢？难道还需自己写代码加载读取配置文件吗？

注：下面代码是在spring boot 1.5.2版本下写的。

pom.xml

 <parent>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-parent</artifactId>    <version>1.5.2.RELEASE</version></parent>   <dependencies>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-web</artifactId>    </dependency></dependencies>

@Value

   使用@Value注入写在application.properties中的配置项

application.properties

logging.config=classpath:logback.xmllogging.path=d:/logs##tomcat set###server.port=80#session 超时时间server.session-timeout=60###########hello=hello china!!!class.schoolName=china schoolclass.className=second grade three classclass.students[0].name=tomclass.students[1].name=jack

在代码中@Value注入到属性中

@Controller@RequestMapping("/")public class HelloController {public static Logger LOG = LoggerFactory.getLogger(HelloController.class);@Value("${hello}")private String hello;@Value("${class.schoolName}")private String schoolName;

@ConfigurationProperties

 如果想把某种相关的配置，注入到某个配置类中，比如上面的application.properties中看到class.xx的配置项，想注入到ClassConfig配置类中

package com.fei.springboot.config;import java.util.ArrayList;import java.util.List;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.stereotype.Component;@Component("classConfig")@ConfigurationProperties(prefix="class")public class ClassConfig {private String schoolName;private String className;private List<StudentConfig> students = new ArrayList<StudentConfig>();public String getSchoolName() {return schoolName;}public void setSchoolName(String schoolName) {this.schoolName = schoolName;}public void setClassName(String className) {this.className = className;}public void setStudents(List<StudentConfig> students) {this.students = students;}public String getClassName() {return className;}public List<StudentConfig> getStudents() {return students;}}

 这样就会把application.properties中以class.开头的配置项给注入进来
我们看到代码中@ConfigurationProperties并没有指明properties，那默认的就是application.properties。那是否有地方指明properties的路径呢？在版本1.5.1之前可以@ConfigurationProperties(prefix="class",location="classpath:/customer.properties")，但是1.5.2版本没有location了，需要用@PropertySource("classpath:/student.properties")

package com.fei.springboot.config;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.PropertySource;import org.springframework.stereotype.Component;@Component("studentConfig")@ConfigurationProperties@PropertySource("classpath:/student.properties")public class StudentConfig {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}}

测试下

package com.fei.springboot.controller;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import com.fei.springboot.config.ClassConfig;import com.fei.springboot.config.StudentConfig;@Controller@RequestMapping("/")public class HelloController {public static Logger LOG = LoggerFactory.getLogger(HelloController.class);@Value("${hello}")private String hello;@Value("${class.schoolName}")private String schoolName;@Autowiredprivate ClassConfig classConfig;@Autowiredprivate StudentConfig studentConfig;@RequestMapping(value="/hello")@ResponseBodypublic String hello(){System.out.println("=======使用@Value注入获取.....===========");System.out.println("hello="+hello+"   schoolName=" + schoolName);System.out.println("======使用@ConfigurationProperties注入获取.....============");System.out.println("schoolName=" + classConfig.getSchoolName());System.out.println("className=" + classConfig.getClassName());System.out.println("student[0].name=" + classConfig.getStudents().get(0).getName());System.out.println("studentConfig...name=" + studentConfig.getName());return "hello";}}

打印结果

2017-05-17 15:20:49.677  INFO 72996 --- [p-nio-80-exec-1] o.s.web.servlet.DispatcherServlet        : FrameworkServlet 'dispatcherServlet': initialization completed in 19 ms2017-05-17 15:20:49.677 [http-nio-80-exec-1] INFO  o.s.web.servlet.DispatcherServlet - FrameworkServlet 'dispatcherServlet': initialization completed in 19 ms=======使用@Value注入获取.....===========hello=hello china!!!   schoolName=china school======使用@ConfigurationProperties注入获取.....============schoolName=china schoolclassName=second grade three classstudent[0].name=tomstudentConfig...name=xiao hong

 源码下载