我想以编程方式在 Spring Boot 项目中注册一个 Spring Converter。在过去的 Spring 项目中,我已经像这样在 XML 中完成了它......
<!-- Custom converters to allow automatic binding from Http requests parameters to objects -->
<!-- All converters are annotated w/@Component -->
<bean id="conversionService"
class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<list>
<ref bean="stringToAssessmentConverter" />
</list>
</property>
</bean>
我正在想办法在 Spring Boot 的 SpringBootServletInitializer 中做些什么
更新:通过将 StringToAssessmentConverter 作为参数传递给 getConversionService
,我取得了一些进展,但现在我得到了一个 "No default constructor发现 StringToAssessmentConverter 类的“
错误。我不确定为什么 Spring 没有看到 @Autowired 构造函数。
@SpringBootApplication
public class Application extends SpringBootServletInitializer {
...
@Bean(name="conversionService")
public ConversionServiceFactoryBean getConversionService(StringToAssessmentConverter stringToAssessmentConverter) {
ConversionServiceFactoryBean bean = new ConversionServiceFactoryBean();
Set<Converter> converters = new HashSet<>();
converters.add(stringToAssessmentConverter);
bean.setConverters(converters);
return bean;
}
}
这是转换器的代码...
@Component
public class StringToAssessmentConverter implements Converter<String, Assessment> {
private AssessmentService assessmentService;
@Autowired
public StringToAssessmentConverter(AssessmentService assessmentService) {
this.assessmentService = assessmentService;
}
public Assessment convert(String source) {
Long id = Long.valueOf(source);
try {
return assessmentService.find(id);
} catch (SecurityException ex) {
return null;
}
}
}
完全错误
Failed to execute goal org.springframework.boot:spring-boot-maven-
plugin:1.3.2.RELEASE:run (default-cli) on project yrdstick: An exception
occurred while running. null: InvocationTargetException: Error creating
bean with name
'org.springframework.boot.context.properties.ConfigurationPropertiesBindingPo
stProcessor': Invocation of init method failed; nested exception is
org.springframework.beans.factory.UnsatisfiedDependencyException: Error
creating bean with name 'conversionService' defined in
me.jpolete.yrdstick.Application: Unsatisfied dependency expressed through
constructor argument with index 0 of type
[me.jpolete.yrdstick.websupport.StringToAssessmentConverter]: : Error
creating bean with name 'stringToAssessmentConverter' defined in file
[/yrdstick/target/classes/me/jpolete/yrdstick/websupport
/StringToAssessmentConverter.class]: Instantiation of bean failed; nested
exception is org.springframework.beans.BeanInstantiationException: Failed
to instantiate
[me.jpolete.yrdstick.websupport.StringToAssessmentConverter]: No default
constructor found; nested exception is java.lang.NoSuchMethodException:
me.jpolete.yrdstick.websupport.StringToAssessmentConverter.<init>();
nested exception is
org.springframework.beans.factory.BeanCreationException: Error creating
bean with name 'stringToAssessmentConverter' defined in file [/yrdstick
/dev/yrdstick/target/classes/me/jpolete/yrdstick/websupport
/StringToAssessmentConverter.class]: Instantiation of bean failed; nested
exception is org.springframework.beans.BeanInstantiationException: Failed
to instantiate
[me.jpolete.yrdstick.websupport.StringToAssessmentConverter]: No default
constructor found; nested exception is java.lang.NoSuchMethodException:
me.jpolete.yrdstick.websupport.StringToAssessmentConverter.<init>()
最佳答案
答案是,你只需要将你的转换器标注为@Component
:
这是我的转换器示例
import org.springframework.core.convert.converter.Converter;
@Component
public class DateUtilToDateSQLConverter implements Converter<java.util.Date, Date> {
@Override
public Date convert(java.util.Date source) {
return new Date(source.getTime());
}
}
然后当Spring需要进行转换时,调用转换器。
我的 Spring Boot 版本:1.4.1
关于java - 在 Spring Boot 中以编程方式注册 Spring Converter,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35025550/