Spring容器管理原型模式获取实例
Service类定义
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);
}
}
重点是@Scope注解,标记以原型模式管理类(默认是单例):
** @Scope(value = BeanDefinition.SCOPE_PROTOTYPE) **
@Lookup注解获取实例
@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";
}
}
重点是 @Lookup,容器初始化的时候会通过cglib字节码库动态生成一个TestController 的子类,并且会覆盖父类的实现,因此 getTaxThread方法,不能为private,不然不会覆盖原有实现!
使用ApplicationContext 获取实例
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";
}
}
重点是要实现ApplicationContextAware 接口,通过setApplicationContext获取上下文,剩下的就是老套路了。
总结
@lookup注解使用更爽,降低Spring强耦合;
使用@lookup注解,需要注意的是 被动态代理方法不能是 private