Java RESTfulWeb服务教程中的自动连接

我已经下载了教程zip fom。它包含带有main方法的应用程序类

package hello;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan
@EnableAutoConfiguration
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

迎宾课

package hello;

public class Greeting {

    private final long id;
    private final String content;

    public Greeting(long id, String content) {
        this.id = id;
        this.content = content;
    }

    public long getId() {
        return id;
    }

    public String getContent() {
        return content;
    }
}

和迎宾控制器

package hello;

import java.util.concurrent.atomic.AtomicLong;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GreetingController {

    private static final String template = "Hello, %s!";
    private final AtomicLong counter = new AtomicLong();

    @RequestMapping("/greeting")
    public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) {
        return new Greeting(counter.incrementAndGet(),
                        String.format(template, name));
    }
}

这很好，但是我想使用Springbeans（使用applicationContext.xml）创建一些问候对象，所以我创建了src/main/resources目录（我使用maven来配置本教程），并将applicationContext.xml放在那里，如下所示

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean name = "greeting" class="hello.Greeting">
         <constructor-arg index="0" value = "25"  />
         <constructor-arg index="1" value = "Hello!"  />  
    </bean> 
</beans>

我怎样才能使这项建设工作？

---

谢谢。

同时添加@Qualifier注释：

@Autowired
@Qualifier("greeting")
Greeting gr;

这意味着Spring没有创建任何

Greeting

类的bean，所以我猜Spring没有导入您的文件。 建议使用

@ImportResource

因此，这将是一种悲哀：

@ComponentScan
@ImportResource("classpath:/applicationContext.xml")
@EnableAutoConfiguration
public class Application {
...
}

---

异常仅仅意味着它无法创建bean

GreetingController

，因为它依赖于您的

Greeting

类（当您添加它并用

@Autowire

注释时）

可能是找不到applicationContext.xml

确保在

web.xml

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
         /location/of/your/applicationContext.xml
    </param-value>
</context-param>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

上下文配置位置
/位置/of/your/applicationContext.xml
org.springframework.web.context.ContextLoaderListener

希望这有帮助

@ComponentScan
@ImportResource("classpath:/applicationContext.xml")
@EnableAutoConfiguration
public class Application {
...
}

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
         /location/of/your/applicationContext.xml
    </param-value>
</context-param>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>