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体验新版 GitCode,发现更多精彩内容 >>
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fc9d1760
编写于
12月 17, 2018
作者:
J
Juergen Hoeller
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差异文件
Revised c-namespace example
Issue: SPR-17601
上级
aab42116
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1
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1 changed file
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23 addition
and
19 deletion
+23
-19
src/docs/asciidoc/core/core-beans.adoc
src/docs/asciidoc/core/core-beans.adoc
+23
-19
未找到文件。
src/docs/asciidoc/core/core-beans.adoc
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fc9d1760
...
...
@@ -927,14 +927,14 @@ element.
[
subs
=
"verbatim,quotes"
]
----
<
beans
>
<
bean
id
=
"
thing
One"
class
=
"x.y.ThingOne"
>
<
constructor
-
arg
ref
=
"
thing
Two"
/>
<
constructor
-
arg
ref
=
"
thing
Three"
/>
<
bean
id
=
"
bean
One"
class
=
"x.y.ThingOne"
>
<
constructor
-
arg
ref
=
"
bean
Two"
/>
<
constructor
-
arg
ref
=
"
bean
Three"
/>
</
bean
>
<
bean
id
=
"
thing
Two"
class
=
"x.y.ThingTwo"
/>
<
bean
id
=
"
bean
Two"
class
=
"x.y.ThingTwo"
/>
<
bean
id
=
"
thing
Three"
class
=
"x.y.ThingThree"
/>
<
bean
id
=
"
bean
Three"
class
=
"x.y.ThingThree"
/>
</
beans
>
----
====
...
...
@@ -1937,27 +1937,28 @@ The following example uses the `c:` namespace to do the same thing as the from
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="
thingOne
" class="x.y.ThingTwo"/>
<bean id="
thingTwo
" class="x.y.ThingThree"/>
<bean id="
beanTwo
" class="x.y.ThingTwo"/>
<bean id="
beanThree
" class="x.y.ThingThree"/>
<!-- traditional declaration -->
<bean id="
thing
One" class="x.y.ThingOne">
<constructor-arg
ref="thing
Two"/>
<constructor-arg
ref="thing
Three"/>
<constructor-arg value="something@somewhere.com"/>
<!-- traditional declaration
with optional argument names
-->
<bean id="
bean
One" class="x.y.ThingOne">
<constructor-arg
name="thingTwo" ref="bean
Two"/>
<constructor-arg
name="thingThree" ref="bean
Three"/>
<constructor-arg
name="email"
value="something@somewhere.com"/>
</bean>
<!-- c-namespace declaration -->
<bean id="thingOne" class="x.y.ThingOne" c:thingTwo-ref="thingTwo" c:thingThree-ref="thingThree" c:email="something@somewhere.com"/>
<!-- c-namespace declaration with argument names -->
<bean id="beanOne" class="x.y.ThingOne" c:thingTwo-ref="beanTwo"
c:thingThree-ref="beanThree" c:email="something@somewhere.com"/>
</beans>
----
====
The `c:` namespace uses the same conventions as the `p:` one (a trailing `-ref` for
bean
references) for setting the constructor arguments by their names. Similarly, it
needs to be declared even though it is not defined in an XSD schema (it exists
inside the Spring core).
The `c:` namespace uses the same conventions as the `p:` one (a trailing `-ref` for
bean references) for setting the constructor arguments by their names. Similarly,
it needs to be declared in the XML file even though it is not defined in an XSD schema
(it exists
inside the Spring core).
For the rare cases where the constructor argument names are not available (usually if
the bytecode was compiled without debugging information), you can use fallback to the
...
...
@@ -1968,12 +1969,15 @@ argument indexes, as follows:
[subs="verbatim,quotes"]
----
<!-- c-namespace index declaration -->
<bean id="thingOne" class="x.y.ThingOne" c:_0-ref="thingTwo" c:_1-ref="thingThree"/>
<bean id="beanOne" class="x.y.ThingOne" c:_0-ref="beanTwo" c:_1-ref="beanThree"
c:_2="something@somewhere.com"/>
----
====
NOTE: Due to the XML grammar, the index notation requires the presence of the leading `_`,
as XML attribute names cannot start with a number (even though some IDEs allow it).
A corresponding index notation is also available for `<constructor-arg>` elements but
not commonly used since the plain order of declaration is usually sufficient there.
In practice, the constructor resolution
<<beans-factory-ctor-arguments-resolution,mechanism>> is quite efficient in matching
...
...
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