子类MyHttpMessageConverter重载了MappingJackson2HttpMessageConverter，MappingJackson2HttpMessageConverter类重载了AbstractJackson2HttpMessageConverter。
read(Type type, Class<?> contextClass, HttpInputMessage inputMessage)方法是在AbstractJackson2HttpMessageConverter里定义的。在MappingJackson2HttpMessageConverter里没有重载这个方法。
那么在MyHttpMessageConverter里override了read(Type type, Class<?> contextClass, HttpInputMessage inputMessage)这个方法后，程序始终没有进到MyHttpMessageConverter的read方法。
代码如下：
//子类
public class MyHttpMessageConverter extends MappingJackson2HttpMessageConverter {
@Override
public Object read(Type type, Class<?> contextClass,
HttpInputMessage inputMessage) throws IOException,
HttpMessageNotReadableException {
//断点始终到不了这里
return super.read(type, contextClass, inputMessage);
}
}
//父类
public class MappingJackson2HttpMessageConverter extends AbstractJackson2HttpMessageConverter {
//重载了AbstractJackson2HttpMessageConverter里其他方法但是不包括read方法
}
//祖父类
public abstract class AbstractJackson2HttpMessageConverter extends AbstractGenericHttpMessageConverter<Object>
implements GenericHttpMessageConverter<Object> {
@Override
public Object read(Type type, Class<?> contextClass, HttpInputMessage inputMessage)
throws IOException, HttpMessageNotReadableException {
JavaType javaType = getJavaType(type, contextClass);
return readJavaType(javaType, inputMessage);
}
}
