5.松散绑定 (松散语法)
就是我们yaml中的last-name等同于实体类中驼峰命名的lastName
实体类的数据
package com.example.springboot01hello.pojo; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; import java.util.Date; import java.util.List; import java.util.Map; @Component /*@ConfigurationProperties作用: * 将配置文件中配置的每一个属性的值，映射到这个组件中； * 告诉SpringBoot将本类中的所有属性和配置文件相关的配置进行绑定 * 参数: prefix = "person"将配置文件中的person下面的所有书信一一对应 * * 只有这个组件是容器中的组件，才能使用容器提供的@ConfigurationProperties功能 */ @ConfigurationProperties(prefix = "person") //这里面的命名不能使用驼峰，全部小写 @PropertySource(value = "classpath:jsxs.properties") public class people { private String lastName; private Integer age; private Boolean happy; private Date birth; //这里的日期格式，一定要是xxxx/xx/xx否则报错 private Map<String,Object> maps; private List<Object> lists; private Dog dog; public people(String lastName, Integer age, Boolean happy, Date birth, Map<String, Object> maps, List<Object> lists, Dog dog) { this.lastName = lastName; this.age = age; this.happy = happy; this.birth = birth; this.maps = maps; this.lists = lists; this.dog = dog; } public people() { } public String getlastName() { return lastName; } public void setlastName(String lastName) { this.lastName = lastName; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public Boolean getHappy() { return happy; } public void setHappy(Boolean happy) { this.happy = happy; } public Date getBirth() { return birth; } public void setBirth(Date birth) { this.birth = birth; } public Map<String, Object> getMaps() { return maps; } public void setMaps(Map<String, Object> maps) { this.maps = maps; } public List<Object> getLists() { return lists; } public void setLists(List<Object> lists) { this.lists = lists; } public Dog getDog() { return dog; } public void setDog(Dog dog) { this.dog = dog; } @Override public String toString() { return "people{" + "lastName='" + lastName + '\'' + ", age=" + age + ", happy=" + happy + ", birth=" + birth + ", maps=" + maps + ", lists=" + lists + ", dog=" + dog + '}'; } }
yaml的配置文件
# 外对象 person: # 基本属性 last-name: jsxs${random.uuid} age: ${random.int} happy: false birth: 2001/12/01 hello: sdsdsd #键值对 maps: {k1: v1,k2: v2} #数组 lists: - code - music - girls # 内嵌对象 dog: # 假如说person这个yaml类中不存在hello,那么就会输出hello00_旺财 # 假如说存在: 就会输出存在的hello的值 name: ${person.hello:hello00}_旺财 age: 15
6.JSR303校验
实质上就是: 利用注解对数据类型进行初步校验。
需要导入依赖以及添加注解 @Validated //数据校验
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-validation --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-validation</artifactId> <version>2.7.7</version> </dependency>
(1).JSR303的总结
message这个属性就是如果出现错误，我们在控制台打印什么消息
@NotNull(message="名字不能为空") private String userName; @Max(value=120,message="年龄最大不能查过120") private int age; @Email(message="邮箱格式错误") private String email; 空检查 @Null 验证对象是否为null @NotNull 验证对象是否不为null, 无法查检长度为0的字符串 @NotBlank 检查约束字符串是不是Null还有被Trim的长度是否大于0,只对字符串,且会去掉前后空格. @NotEmpty 检查约束元素是否为NULL或者是EMPTY. Booelan检查 @AssertTrue 验证 Boolean 对象是否为 true @AssertFalse 验证 Boolean 对象是否为 false 长度检查 @Size(min=, max=) 验证对象（Array,Collection,Map,String）长度是否在给定的范围之内 @Length(min=, max=) string is between min and max included. 日期检查 @Past 验证 Date 和 Calendar 对象是否在当前时间之前 @Future 验证 Date 和 Calendar 对象是否在当前时间之后 @Pattern 验证 String 对象是否符合正则表达式的规则 .......等等 除此以外，我们还可以自定义一些数据校验规则
(2).JSR303数据核验的测试
实体类 人
- 添加注解 @Validated //数据校验
- 进行测试邮箱 @Email(message = “邮箱格式错误!”)
package com.example.springboot01hello.pojo; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.PropertySource; import org.springframework.stereotype.Component; import org.springframework.validation.annotation.Validated; import javax.validation.constraints.Email; import java.util.Date; import java.util.List; import java.util.Map; @Component /*@ConfigurationProperties作用: * 将配置文件中配置的每一个属性的值，映射到这个组件中； * 告诉SpringBoot将本类中的所有属性和配置文件相关的配置进行绑定 * 参数: prefix = "person"将配置文件中的person下面的所有书信一一对应 * * 只有这个组件是容器中的组件，才能使用容器提供的@ConfigurationProperties功能 */ @ConfigurationProperties(prefix = "person") //这里面的命名不能使用驼峰，全部小写 @PropertySource(value = "classpath:jsxs.properties") @Validated //数据校验 public class people { @Email(message = "邮箱格式错误!") private String name; private Integer age; private Boolean happy; private Date birth; //这里的日期格式，一定要是xxxx/xx/xx否则报错 private Map<String,Object> maps; private List<Object> lists; private Dog dog; public people(String name, Integer age, Boolean happy, Date birth, Map<String, Object> maps, List<Object> lists, Dog dog) { this.name = name; this.age = age; this.happy = happy; this.birth = birth; this.maps = maps; this.lists = lists; this.dog = dog; } public people() { } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public Boolean getHappy() { return happy; } public void setHappy(Boolean happy) { this.happy = happy; } public Date getBirth() { return birth; } public void setBirth(Date birth) { this.birth = birth; } public Map<String, Object> getMaps() { return maps; } public void setMaps(Map<String, Object> maps) { this.maps = maps; } public List<Object> getLists() { return lists; } public void setLists(List<Object> lists) { this.lists = lists; } public Dog getDog() { return dog; } public void setDog(Dog dog) { this.dog = dog; } @Override public String toString() { return "people{" + "name='" + name + '\'' + ", age=" + age + ", happy=" + happy + ", birth=" + birth + ", maps=" + maps + ", lists=" + lists + ", dog=" + dog + '}'; } }
