关于SpringBoot获取IOC容器中注入的Bean(推荐)

package com.shop.sell.Utils; 
import com.shop.sell.dto.CartDTO; 
import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.Configuration; 
@Configuration 
public class TestUtils { 
  @Bean(name="testDemo") 
  public CartDTO said() { 
    CartDTO cartDTO = new CartDTO(); 
    cartDTO.setProductID(789); 
    cartDTO.setProductQuantity(10); 
    return cartDTO; 
  } 
} 

package com.shop.sell.Utils; 
import org.springframework.beans.BeansException; 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.ApplicationContextAware; 
import org.springframework.stereotype.Component; 
@Component 
public class SpringUtil implements ApplicationContextAware{ 
  private static ApplicationContext applicationContext; 
  @Override 
  public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 
    if(SpringUtil.applicationContext == null) { 
      SpringUtil.applicationContext = applicationContext; 
    } 
  } 
  public static ApplicationContext getApplicationContext() { 
    return applicationContext; 
  } 
  public static Object getBean(String name){ 
    return getApplicationContext().getBean(name); 
  } 
  public static <T> T getBean(Class<T> clazz){ 
    return getApplicationContext().getBean(clazz); 
  } 
  public static <T> T getBean(String name,Class<T> clazz){ 
    return getApplicationContext().getBean(name, clazz); 
  } 
} 

package com.shop.sell.controller; 
import com.shop.sell.Utils.ResultVOUtil; 
import com.shop.sell.Utils.SpringUtil; 
import com.shop.sell.VO.ProductInfoVO; 
import com.shop.sell.VO.ProductVO; 
import com.shop.sell.VO.ResultVO; 
import com.shop.sell.dataobject.ProductCategory; 
import com.shop.sell.dataobject.ProductInfo; 
import com.shop.sell.dto.CartDTO; 
import com.shop.sell.from.OrderForm; 
import com.shop.sell.service.CategoryService; 
import com.shop.sell.service.ProductService; 
import org.springframework.beans.BeanUtils; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.context.ApplicationContext; 
import org.springframework.web.bind.annotation.GetMapping; 
import org.springframework.web.bind.annotation.RequestMapping; 
import org.springframework.web.bind.annotation.RestController; 
import java.util.ArrayList; 
import java.util.Arrays; 
import java.util.List; 
/** 
 * 买家商品 
 */ 
@RestController 
@RequestMapping("/buyer/product") 
public class BuyerProductController { 
  private static ApplicationContext applicationContext; 
  @Autowired 
  private ProductService productService; 
  @Autowired 
  private CategoryService categoryService; 
  @GetMapping(value = "/list") 
  public CartDTO list(){ 
    CartDTO cartDTO = (CartDTO) SpringUtil.getBean("testDemo"); 
    return cartDTO; 
  } 
}