小编给大家分享一下如何使用SpringBoot配置和占位符获取配置文件中的值,希望大家阅读完这篇文章之后都有所收获,下面让我们一起去探讨吧!springboot配置和占位符获取配置文件值@PropertySource& 加载指定的配
小编给大家分享一下如何使用SpringBoot配置和占位符获取配置文件中的值,希望大家阅读完这篇文章之后都有所收获,下面让我们一起去探讨吧!
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; @Component@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 ); }}
以上方式过于麻烦,springboot推荐通过全注解方式,添加组件的方式
通过注解@Configration申明一个配置类,通过注解@Bean可以使用在方法上面,申明一个组件的生成,要是放在方法上,表明这个方法的返回值放在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;@Configurationpublic 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; } }
通过占位符获取值
#通过使用占位符赋值persion.name=张三${random.value}persion.bool=falsepersion.id=12${random.int} person.last‐name=张三${random.uuid}person.age=${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=${person.hello:hello}_dog person.dog.age=15
让user类可用通过配置文件进行实例化
package com.example.springdemo.entity;import lombok.Data;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;import org.springframework.stereotype.Component;import org.springframework.validation.annotation.Validated; import java.util.List; @Component//把User加到容器中@Data@ConfigurationProperties(prefix = "com")public class User { private Long id; private String name; private Integer age; private List<Object>list; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge(int i) { return age; } public void setAge(Integer age) { this.age = age; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } private String email; public Integer getAge() { return age; } public List<Object> getList() { return list; } public void setList(List<Object> list) { this.list = list; }}
com.email=99@dfp.comcom.name=newDFP${com.cc:不存在给默认值}com.age=${random.int}
首先就是对age取随机数然后对name获取对象的数据
package com.example.springdemo; import com.example.springdemo.entity.User;import com.example.springdemo.mapper.UserMapper;import com.example.springdemo.properties.Myproperties;import org.junit.jupiter.api.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.context.ApplicationContext;import org.springframework.test.context.junit4.SpringRunner; import javax.sql.DataSource;import java.sql.SQLException;import java.util.List; @SpringBootTest@RunWith(SpringRunner.class)class SpringdemoApplicationTests { //如果测试类与启动入口类包名不一致,必须加该注解属性classes指定启动入口类,否则无法启动SpringBoot @Autowired private DataSource dataSource; @Test public void dataSource() { try { System.out.println(dataSource.getConnection()); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Autowired Myproperties myproperties; @Test void test(){ System.out.println("------------------------"); System.out.println(myproperties.getMes()); } @Autowired UserMapper userMapper; @Test void testmybatisPlus(){ List<User> users=userMapper.selectList(null); for (User user:users){ System.out.println(user); } System.out.println("查询成功!"); User aduuser=new User();// aduuser.setName("DFP");// aduuser.setAge(18);// aduuser.setEmail("DFP19053025@qq.com");// aduuser.setId(19053065L); int i=userMapper.insert(aduuser); if (i>0){ System.out.println("成功加入记录!"); }else{ System.out.println("失败加入记录!");} for (User user:users){ System.out.println(user); } } @Autowired User user; @Test public void contextlodes(){ System.out.println("测试结果输出:"+user); }}
结果
因为com.cc是不存在的就回去:后面的默认值
如果com.cc存在就会取com.cc的值
com.email=99@dfp.comcom.name=newDFP+++${com.email:不存在给默认值}com.age=${random.int}
这次的值不再是默认值了com.email是存在数据的
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