Resource不能直接返回嗎？
老師，Resource不能直接返回嗎，為什么需要new一個(gè)新的對(duì)象，copy一份
SophieV5
2018-03-22
3 回答
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2018-06-13
同問(wèn)！
2018-04-12
老師，我直接返回Resource報(bào)錯(cuò)了，為什么
@RequestMapping("/getResource")
public JsonUtil getResource() {
Resource bean=new Resource();
//BeanUtils.copyProperties(resource, bean);
//System.out.println(resource);
//System.out.println(bean);
return JsonUtil.ok(resource);
}
2018-04-12 13:01:56.862 ?WARN 10980 --- [nio-8090-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.imooc.util.JsonUtil["date"]->com.imooc.model.Resource$$EnhancerBySpringCGLIB$$21953e4a["$$beanFactory"]->org.springframework.beans.factory.support.DefaultListableBeanFactory["beanExpressionResolver"])
2018-04-12 13:01:56.862 ?WARN 10980 --- [nio-8090-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.imooc.util.JsonUtil["date"]->com.imooc.model.Resource$$EnhancerBySpringCGLIB$$21953e4a["$$beanFactory"]->org.springframework.beans.factory.support.DefaultListableBeanFactory["beanExpressionResolver"])
2018-03-22
當(dāng)然可以啦