RestController和Controller的区别
官方文档：
A convenience annotation that is itself annotated with @Controller and @ResponseBody.
意思是：
@RestController注解相当于@ResponseBody ＋ @Controller合在一起的作用。
1)如果只是使用@RestController注解Controller，则Controller中的方法无法返回jsp页面，配置的视图解析器InternalResourceViewResolver则不起作用，返回的内容就是Return 里的内容（String/JSON）。
例如：本来应该到success.jsp页面的，则其显示success.
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@RequestMapping
(
value
=
"/test"
)
public
String
test
(
HttpServletRequest
request
,
HttpServletResponse
response
)
{
return
"success"
;
}
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2))如果使用@RestController注解Controller，需要返回到指定页面，则需要配置视图解析器InternalResourceViewResolver，可以利用ModelAndView返回试图。
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@RequestMapping
(
value
=
"/test"
)
public
String
test
(
HttpServletRequest
request
,
HttpServletResponse
response
)
{
return
newModelAndView
(
"success"
)
;
}
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3)如果使用@Controller注解Controller，如果需要返回JSON，XML或自定义mediaType内容到页面，则需要在对应的方法上加上@ResponseBody注解。
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@ResponseBody
@RequestMapping
(
value
=
"/test"
)
public
String
test
(
HttpServletRequest
request
,
HttpServletResponse
response
)
{
return
"success"
;
}
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最后给大家贴上Spring4.x的RestController和Controller源码，供大家学习和理解。
RestController源码：
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/*
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package
org
.
springframework
.
web
.
bind
.
annotation
;
import
java
.
lang
.
annotation
.
Documented
;
import
java
.
lang
.
annotation
.
ElementType
;
import
java
.
lang
.
annotation
.
Retention
;
import
java
.
lang
.
annotation
.
RetentionPolicy
;
import
java
.
lang
.
annotation
.
Target
;
import
org
.
springframework
.
stereotype
.
Controller
;
/**
* A convenience annotation that is itself annotated with {@link Controller @Controller}
* and {@link ResponseBody @ResponseBody}.
*
* Types that carry this annotation are treated as controllers where
* {@link RequestMapping @RequestMapping} methods assume
* {@link ResponseBody @ResponseBody} semantics by default.
*
* @author Rossen Stoyanchev
* @author Sam Brannen
* @since 4.0
*/
@Target
(
ElementType
.
TYPE
)
@Retention
(
RetentionPolicy
.
RUNTIME
)
@Documented
@Controller
@ResponseBody
public
@interface
RestController
{
/**
* The value may indicate a suggestion for a logical component name,
* to be turned into a Spring bean in case of an autodetected component.
* @return the suggested component name, if any
* @since 4.0.1
*/
String
value
(
)
default
""
;
}
|
Controller源码：
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/*
* Copyright 2002-2007 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package
org
.
springframework
.
stereotype
;
import
java
.
lang
.
annotation
.
Documented
;
import
java
.
lang
.
annotation
.
ElementType
;
import
java
.
lang
.
annotation
.
Retention
;
import
java
.
lang
.
annotation
.
RetentionPolicy
;
import
java
.
lang
.
annotation
.
Target
;
/**
* Indicates that an annotated class is a "Controller" (e.g. a web controller).
*
*
This annotation serves as a specialization of {@link Component @Component},
* allowing for implementation classes to be autodetected through classpath scanning.
* It is typically used in combination with annotated handler methods based on the
* {@link org.springframework.web.bind.annotation.RequestMapping} annotation.
*
* @author Arjen Poutsma
* @author Juergen Hoeller
* @since 2.5
* @see Component
* @see org.springframework.web.bind.annotation.RequestMapping
* @see org.springframework.context.annotation.ClassPathBeanDefinitionScanner
*/
@Target
(
{
ElementType
.
TYPE
}
)
@Retention
(
RetentionPolicy
.
RUNTIME
)
@Documented
@Component
public
@interface
Controller
{
/**
* The value may indicate a suggestion for a logical component name,
* to be turned into a Spring bean in case of an autodetected component.
* @return the suggested component name, if any
*/
String
value
(
)
default
""
;
}
|