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小編給大家分享一下如何使用springboot配置和占位符獲取配置文件中的值,希望大家閱讀完這篇文章之后都有所收獲,下面讓我們一起去探討吧!
package com.example.springbootdemo.pojo; import com.alibaba.fastjson.JSON; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; /** * ***GOOD LUCK**** * * @Author : Wukn * @Date : 2018/6/ * * 將配置文件中的的每一個屬性的值,映射到這個組建中 *@ConfigurationProperties * prefix = "persion" 指定在配置文件中需要將persion的配置屬性映射到這個實(shí)體類中 */ /** * 獲取指定配置文件 * @PropertySource( value = {"classpath:coms.properties"}) */ @Component /** * @ConfigurationProperties(prefix = "persion"),默認(rèn)獲取根目錄下的值 */ @ConfigurationProperties(prefix = "persion") public class Persion { private String name; private Integer id; private Boolean bool; public Persion() { } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public Boolean getBool() { return bool; } public void setBool(Boolean bool) { this.bool = bool; } @Override public String toString() { return JSON.toJSONString( this ); } }
以上方式過于麻煩,springboot推薦通過全注解方式,添加組件的方式
通過注解@Configration申明一個配置類,通過注解@Bean可以使用在方法上面,申明一個組件的生成,要是放在方法上,表明這個方法的返回值放在ioc容器中
package com.example.springbootdemo.configration; import com.fasterxml.jackson.annotation.JsonAutoDetect; import com.fasterxml.jackson.annotation.PropertyAccessor; import com.fasterxml.jackson.databind.ObjectMapper; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.redis.connection.RedisConnectionFactory; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer; /** * Created with IntelliJ IDEA. * Description: Cms數(shù)據(jù)源的一些設(shè)置 * Date: 2018-06-08 * Time: 5:50 PM * * @author: wukn */ @Configuration public class DataConfig { @Bean public RedisTemplate redisTemplate(RedisConnectionFactory factory) { RedisTemplate template = new RedisTemplate(); template.setConnectionFactory(factory); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); ObjectMapper om = new ObjectMapper(); om.setVisibility( PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY); om.enableDefaultTyping( ObjectMapper.DefaultTyping.NON_FINAL); jackson2JsonRedisSerializer.setObjectMapper(om); template.setValueSerializer(jackson2JsonRedisSerializer); template.afterPropertiesSet(); return template; } }
通過占位符獲取值
#通過使用占位符賦值 persion.name=張三${random.value} persion.bool=false persion.id=12${random.int} person.last‐name=張三${random.uuid} person.age=${random.int} person.birth=2017/12/15 person.boss=false person.maps.k1=v1 person.maps.k2=14 person.lists=a,b,c person.dog.name=${person.hello:hello}_dog person.dog.age=15
讓user類可用通過配置文件進(jìn)行實(shí)例化
package com.example.springdemo.entity; import lombok.Data; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; import org.springframework.validation.annotation.Validated; import java.util.List; @Component//把User加到容器中 @Data /** * @ConfigurationProperties * 可以將配置文件中的每一個屬性的值,映射到這個組件中 * 告訴springboot將奔雷中的所有屬性和配置文件中的相關(guān)屬性先綁定 * prefix = "com"綁定配置文件com層級下的屬性進(jìn)行一一映射 * 只有是容器才能使用所以要添加注解@Component */ @ConfigurationProperties(prefix = "com") public class User { private Long id; private String name; private Integer age; private List<Object>list; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge(int i) { return age; } public void setAge(Integer age) { this.age = age; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } private String email; public Integer getAge() { return age; } public List<Object> getList() { return list; } public void setList(List<Object> list) { this.list = list; } }
com.email=99@dfp.com com.name=newDFP${com.cc:不存在給默認(rèn)值} com.age=${random.int}
首先就是對age取隨機(jī)數(shù)然后對name獲取對象的數(shù)據(jù)
package com.example.springdemo; import com.example.springdemo.entity.User; import com.example.springdemo.mapper.UserMapper; import com.example.springdemo.properties.Myproperties; import org.junit.jupiter.api.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.context.ApplicationContext; import org.springframework.test.context.junit4.SpringRunner; import javax.sql.DataSource; import java.sql.SQLException; import java.util.List; @SpringBootTest @RunWith(SpringRunner.class) class SpringdemoApplicationTests { //如果測試類與啟動入口類包名不一致,必須加該注解屬性classes指定啟動入口類,否則無法啟動SpringBoot @Autowired private DataSource dataSource; @Test public void dataSource() { try { System.out.println(dataSource.getConnection()); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Autowired Myproperties myproperties; @Test void test(){ System.out.println("------------------------"); System.out.println(myproperties.getMes()); } @Autowired UserMapper userMapper; @Test void testMybatisPlus(){ List<User> users=userMapper.selectList(null); for (User user:users){ System.out.println(user); } System.out.println("查詢成功!"); User aduuser=new User(); // aduuser.setName("DFP"); // aduuser.setAge(18); // aduuser.setEmail("DFP19053025@qq.com"); // aduuser.setId(19053065L); int i=userMapper.insert(aduuser); if (i>0){ System.out.println("成功加入記錄!"); }else{ System.out.println("失敗加入記錄!");} for (User user:users){ System.out.println(user); } } @Autowired User user; @Test public void contextlodes(){ System.out.println("測試結(jié)果輸出:"+user); } }
結(jié)果
因?yàn)閏om.cc是不存在的就回去:后面的默認(rèn)值
如果com.cc存在就會取com.cc的值
com.email=99@dfp.com com.name=newDFP+++${com.email:不存在給默認(rèn)值} com.age=${random.int}
這次的值不再是默認(rèn)值了com.email是存在數(shù)據(jù)的
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