Spring核心
BeanFactoryPostProcessor与BeanPostProcessor使用 创建pc过程
https://www.liangzl.com/get-article-detail-8613.html
BeanFactory 与ApplicationContext 设计思想
https://www.chkui.com/article/spring/spring_core_context_and_ioc
非侵入式扩展功能
https://www.chkui.com/article/spring/spring_core_bean_post_processors
Spring在Bean Validation
@Configuration
@ComponentScan("chkui.springcore.example.hybrid.springvalidation.service")
public class SpringValidationConfig {
@Bean("validator")
public Validator validator() {
return new LocalValidatorFactoryBean();
}
@Bean
public MethodValidationPostProcessor methodValidationPostProcessor(Validator validator) {
MethodValidationPostProcessor postProcessor = new MethodValidationPostProcessor();
postProcessor.setValidator(validator);
return postProcessor;
}
}
//对方法进行参数校验
try {
PersonService personService = ctx.getBean(PersonService.class);
personService.execute(null, 1);//传递参数
} catch (ConstraintViolationException error) {
error.getConstraintViolations().forEach(err -> {//输出校验错误信息
print("Field: ", err.getPropertyPath());
print("Error: ", err.getMessage());
});
}
@Validated({Creation.class}) @RequestBody UserDTO userDTO
但是出现其他字段不执行验证的问题,找了一大圈,发现@Validated在分组验证时并没有添加Default.class的分组,而其他字段默认都是Default分组,所以需要让分组接口继承Default:
public interface Creation extends Default {
}
https://www.cnblogs.com/hujihon/p/5357481.html
PropertyEditor 字符串到实体转换
使用Spring的BeanWrapper接口,可以快速的将Properties数据结构转换为一个JavaBean实体。
https://www.chkui.com/article/spring/spring_core_string_to_entity
数据的类型转换
Spring的类型转换的基础是Converter<S, T>(以下简称转换器)接口
ConverterFactory<S, R>
ConversionService 为数据转换预设了大量的Converter 包含了几乎所有Java常规类型的数据格式转换
public abstract class Device {
public void pares(String text){ //字符串转换为实体
Field[] fields = this.getClass().getDeclaredFields();
for (Field field : fields) {
int begIndex = text.indexOf(field.getName());
int endIndex = text.indexOf(";", begIndex);
String sub = text.substring(begIndex, endIndex), value = sub.split("=")[1];
field.setAccessible(true);
field.set(this, value);
}
};
public String value(){ //实体转换为字符串
Field[] fields = this.getClass().getDeclaredFields();
StringBuilder sb = new StringBuilder();
for (Field field : fields) {
sb.append(field.getName());
sb.append("=");
sb.append(field.get(this).toString());
sb.append(";");
}
return sb.toString();
}
}
public interface ConverterFactory<S, R> {
<T extends R> Converter<S, T> getConverter(Class<T> targetType);
}
public class String2DeviceConverterFactory implements ConverterFactory<String, Device> {
public <T extends Device> Converter<String, T> getConverter(Class<T> targetType) {
return new String2DeviceConverter(targetType);
}
// Device的通用转换器
static class String2DeviceConverter<T extends Device> implements Converter<String, Device> {
private Class<? extends Device> klass;
public String2DeviceConverter(Class<? extends Device> klass) {
this.klass = klass;
}
public T convert(String source) {
Device device = null;
device = klass.newInstance();
device.pares(source);
return (T) device;
}
}
}
ConfigurableApplicationContext ctx = new AnnotationConfigApplicationContext(ConversionConfig.class);
// 获取ConversionService
ConversionService service = ctx.getBean(ConversionService.class);
// 字符串转换为整型
int i = service.convert("123456", Integer.class);
// 字符串转换为浮点
float f = service.convert("1234.56", Float.class);
// 源生列表转换为List
List<?> list = service.convert(new int[] { 1, 2, 3, 4, 5, 6 }, List.class);
// 源生列表转换为Set
Set<?> set = service.convert(new int[] { 1, 2, 3, 4, 5, 6 }, Set.class);
// 枚举转换
Gender gender = service.convert("Male", Gender.class);
// 使用自定义转换器
PC pc = service.convert("cpu=amd;ram=kingston;graphic=Navidia;", PC.class);
// UUID转换
UUID uuid = service.convert("f51b4b95-0925-4ad0-8c62-4daf3ea7918f", UUID.class);
// 字符串转换为Optional<PC>
Optional<PC> options = service.convert("cpu=amd;ram=kingston;graphic=Navidia;", Optional.class);
// 使用TypeDescriptor描述进行转换
String source = "123456789";
int result = (int) service.convert(source, TypeDescriptor.valueOf(source.getClass()),
TypeDescriptor.valueOf(Integer.class));
_G.print(result);
}
enum Gender {
Male, Female, Other
}
https://www.chkui.com/article/spring/spring_core_type_conversion
https://www.chkui.com/article/spring/spring_core_data_validation
https://www.chkui.com/article/java/java_bean_validation
https://www.chkui.com/article/spring/spring_core_jsr250_and_resource