SpringBoot学习：获取yml和properties配置文件的内容

项目下载地址：http://download.csdn.net/detail/aqsunkai/9805821

（一）yml配置文件：

pom.xml加入依赖：

<!-- 支持 @ConfigurationProperties 注解 -->
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-configuration-processor -->
<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-configuration-processor</artifactId>
      <version>${spring-boot.version}</version>
</dependency>

在application.yml文件中加上：

#自定义的属性和值
myYml:
  simpleProp: simplePropValue
  arrayProps: 1,2,3,4,5
  listProp1:
    - name: abc
      value: abcValue
    - name: efg
      value: efgValue
  listProp2:
    - config2Value1
    - config2Vavlue2
  mapProps:
    key1: value1
    key2: value2

使用一个java类获取yml文件的内容：

package com.sun.configuration;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 加载yaml配置文件的方法
 * Created by sun on 2017-1-15.
 * spring-boot更新到1.5.2版本后locations属性无法使用
 * @PropertySource注解只可以加载proprties文件,无法加载yaml文件
 * 故现在把数据放到application.yml文件中,spring-boot启动时会加载
 */
@Component
//@ConfigurationProperties(locations = {"classpath:config/myProps.yml"},prefix = "myProps")
@ConfigurationProperties(prefix = "myYml")
public class YmlConfig {

    String simpleProp;
    private String[] arrayProps;
    private List<Map<String, String>> listProp1 = new ArrayList<>(); //接收prop1里面的属性值
    private List<String> listProp2 = new ArrayList<>(); //接收prop2里面的属性值
    private Map<String, String> mapProps = new HashMap<>(); //接收prop1里面的属性值

    public String getSimpleProp() {
        return simpleProp;
    }

    //String类型的一定需要setter来接收属性值；maps, collections, 和 arrays 不需要
    public void setSimpleProp(String simpleProp) {
        this.simpleProp = simpleProp;
    }

    public String[] getArrayProps() {
        return arrayProps;
    }

    public void setArrayProps(String[] arrayProps) {
        this.arrayProps = arrayProps;
    }

    public List<Map<String, String>> getListProp1() {
        return listProp1;
    }

    public void setListProp1(List<Map<String, String>> listProp1) {
        this.listProp1 = listProp1;
    }

    public List<String> getListProp2() {
        return listProp2;
    }

    public void setListProp2(List<String> listProp2) {
        this.listProp2 = listProp2;
    }

    public Map<String, String> getMapProps() {
        return mapProps;
    }

    public void setMapProps(Map<String, String> mapProps) {
        this.mapProps = mapProps;
    }
}

通过依赖注入就可以获取该对象：

@Autowired
private YmlConfig config;

方法内获取值：

ObjectMapper objectMapper = new ObjectMapper();
//测试加载yml文件
System.out.println("simpleProp: " + config.getSimpleProp());
System.out.println("arrayProps: " + objectMapper.writeValueAsString(config.getArrayProps()));
System.out.println("listProp1: " + objectMapper.writeValueAsString(config.getListProp1()));
System.out.println("listProp2: " + objectMapper.writeValueAsString(config.getListProp2()));
System.out.println("mapProps: " + objectMapper.writeValueAsString(config.getMapProps()));

（二）properties配置文件：

使用@PropertySource注解加载配置文件，该注解无法加载yml配置文件。使用@Value注解获得文件中的参数值

package com.sun.configuration;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;

/**
 * 加载properties配置文件,在方法中可以获取
 * abc.properties文件不存在,验证ignoreResourceNotFound属性
 * 加上encoding = "utf-8"属性防止中文乱码,不能为大写的"UTF-8"
 * Created by sun on 2017-3-30.
 */
@Configuration
@PropertySource(value = {"classpath:/config/propConfigs.properties","classpath:/config/abc.properties"},
        ignoreResourceNotFound = true,encoding = "utf-8")
public class PropConfig {

    // PropertySourcesPlaceholderConfigurer这个bean，
    // 这个bean主要用于解决@value中使用的${…}占位符。
    // 假如你不使用${…}占位符的话，可以不使用这个bean。
    @Bean
    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }
}
获取properties文件参数值有两种方法，一种获得Environment 的对象，第二种就是@Value注解

@Autowired
    private Environment env;
    @Value("${age}")
    String name;

    @RequestMapping("/")
    @ResponseBody
    String home(HttpServletRequest req) throws JsonProcessingException, UnsupportedEncodingException {
        logger.info("测试通过！！！");
        ObjectMapper objectMapper = new ObjectMapper();
        //测试加载yml文件
        System.out.println("simpleProp: " + config.getSimpleProp());
        System.out.println("arrayProps: " + objectMapper.writeValueAsString(config.getArrayProps()));
        System.out.println("listProp1: " + objectMapper.writeValueAsString(config.getListProp1()));
        System.out.println("listProp2: " + objectMapper.writeValueAsString(config.getListProp2()));
        System.out.println("mapProps: " + objectMapper.writeValueAsString(config.getMapProps()));

        //测试加载properties文件
        System.out.println(env.getProperty("name"));//孙凯
        System.out.println(env.getProperty("abc"));//null
        System.out.println(name);//

        return "Hello World!";
    }