Java 你如何将 bean 注入 @Controller 类
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/3735762/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
how do you inject a bean into a @Controller class
提问by GriffeyDog
I'm somewhat new to Spring (using 3.0), so I'm hoping there is a simple answer. If I have a controller that is annotated with @Controllerand @RequestMappingand I want to set a property via dependency injection, how do I go about doing that? The controller class doesn't have to appear in the Spring configuration file because it gets picked up automatically because of the @Controllerannotation.
我对 Spring（使用 3.0）有点陌生，所以我希望有一个简单的答案。如果我有一个用@Controllerand注释的控制器，@RequestMapping我想通过依赖注入设置一个属性，我该怎么做？控制器类不必出现在 Spring 配置文件中，因为它会因为@Controller注解而被自动选取。
Example Controller class:
示例控制器类：
package gov.wi.dnr.wh.web.spring;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class RehabHomeController {
private String xxx;
@RequestMapping(value="/rehab/home", method = RequestMethod.GET)
public String get() {
return "whdb.rehabhome";
}
public String getXxx() {
return xxx;
}
public void setXxx(String xxx) {
this.xxx = xxx;
}
}
Spring configuration:
弹簧配置：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<context:component-scan base-package="gov.wi.dnr.wh.web.spring"/>
<mvc:annotation-driven />
</beans>
This works as is, but I would like to inject the "xxx" property. How do I go about doing that?
这按原样工作，但我想注入“xxx”属性。我该怎么做？
采纳答案by Bozho
@Autowired
private YourService yourServiceBean;
(you can also use @Inject)
（你也可以使用@Inject）
Of course, YourServicehas to be declared as a bean - either in applicationContext.xml, or by annotations (@Servicefor example)
当然，YourService必须声明为 bean - 无论是在 中applicationContext.xml，还是通过注释（@Service例如）
If you want to inject string properties, you can use the @Valueannotation:
如果要注入字符串属性，可以使用@Value注释：
@Value("${propName}")
private String str;
(For that you will need a PropertyPlaceholderConfigurer)
（为此，您将需要一个PropertyPlaceholderConfigurer）
