Spring容器管理原型模式獲取實例 @lookup註解

Service類定義

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

@Component
@Scope(value = BeanDefinition.SCOPE_PROTOTYPE)
public class TaxThread extends Thread {
    @Log
    private static Logger logger;
    @Autowired
    private LocalService localService;
    	
    private Map param;
	
	public TaxThread() {
    }

    public TaxThread(Map map) {
        setParam(map);
    }
        @Override
    public void run() {
        localService.save(map);
    }
}

重點是@Scope註解，標記以原型模式管理類（默認是單例）：
** @Scope(value = BeanDefinition.SCOPE_PROTOTYPE) **

@Lookup註解獲取實例

@RestController
public class TestController {
    @Log
    private static Logger log;

    @Lookup
    protected TaxThread getTaxThread(Map param){
        return new TaxThread(param);
    }

    @PostMapping("/testTaxData")
    public Object testTaxData(String serviceid, String json) throws Exception {
        try {
            Map map = JsonUtil.parse(json, Map.class);
            TaxThread t = getTaxThread(map);
			System.out.println(t.toString());
            t.start();
            return "ok";
        } catch (Exception e) {
            log.error("", e);
        }
        return "no";
    }
}

重點是 @Lookup，容器初始化的時候會通過cglib字節碼庫動態生成一個TestController 的子類，並且會覆蓋父類的實現，因此 getTaxThread方法，不能爲private，不然不會覆蓋原有實現！

使用ApplicationContext 獲取實例

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class TestController implements ApplicationContextAware {
    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    protected TaxThread getTaxThread(Map map){
        TaxThread taxThread = applicationContext.getBean("taxThread",TaxThread.class);
        taxThread.setMap(map);
        return taxThread;
    }

    @PostMapping("/testTaxData")
    public Object testTaxData(String serviceid, String json) throws Exception {
        try {
            Map map = JsonUtil.parse(json, Map.class);
            TaxThread t = getTaxThread(map);
            t.start();
            System.out.println(t.toString());
            return "ok";
        } catch (Exception e) {
            log.error("", e);
        }
        return "no";
    }
}

重點是要實現ApplicationContextAware 接口，通過setApplicationContext獲取上下文，剩下的就是老套路了。

總結

@lookup註解使用更爽，降低Spring強耦合；
使用@lookup註解，需要注意的是 被動態代理方法不能是 private