关于@Value注解失效的原因分析

/**
 * 抽象工厂+反射
 */
//不能在非注册的类中使用（类需要被注册在spring上下文中，如用@Service,@RestController,@Component等）；
public class SimpleAbstractFactory  {
    @Value("${packName}")
    //不能作用于静态变量（static）
    private static String packName;
    @Value("${sqlName}")
    //不能作用于常量（final）;
    private final String sqlName;
    public IUser CreateUser() throws Exception{
            String className=packName+"."+sqlName+"IUser";
            return (IUser)Class.forName(className).newInstance();
    }
    public IDepartment CreateDepartment() throws Exception{
            String className=packName+"."+sqlName+"IDepartment";
            return (IDepartment)Class.forName(className).newInstance();
    }
}

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:spring-config.xml"})
public class MainToken{
    @Test
	public void testToken() {
		try{
            //使用这个类时，只能通过依赖注入的方式，用new的方式是不会自动注入这些配置的。
			SimpleAbstractFactory  simpleAbstractFactory=new SimpleAbstractFactory();
			User user=new User();
			Department department=new Department();
			IDepartment idp=simpleAbstractFactory.CreateDepartment();
			IUser ius=simpleAbstractFactory.CreateUser();
			idp.insert(department);
			idp.getDepartment(Long.valueOf(1));
			ius.insert(user);
			ius.getUser(Long.valueOf(1));
		}catch(Exception e){
		}
	}
}

/**
 * 抽象工厂+反射
 */
@Service
public class SimpleAbstractFactory  {
    @Value("${packName}")
    private String packName;
    @Value("${sqlName}")
    private String sqlName;
    public IUser CreateUser() throws Exception{
            String className=packName+"."+sqlName+"IUser";
            return (IUser)Class.forName(className).newInstance();
    }
    public IDepartment CreateDepartment() throws Exception{
            String className=packName+"."+sqlName+"IDepartment";
            return (IDepartment)Class.forName(className).newInstance();
    }
}

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:spring-config.xml"})
public class MainToken {
    @Autowired
	//使用这个类时，只能通过依赖注入的方式，用new的方式是不会自动注入这些配置的。
	private SimpleAbstractFactory simpleAbstractFactory;
    @Test
	public void testToken() {
		try{
			User user=new User();
			Department department=new Department();
			IDepartment idp=simpleAbstractFactory.CreateDepartment();
			IUser ius=simpleAbstractFactory.CreateUser();
			idp.insert(department);
			idp.getDepartment(Long.valueOf(1));
			ius.insert(user);
			ius.getUser(Long.valueOf(1));
		}catch(Exception e){
		}
	}
}

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    // 从这里开始，先获取容器
    ServletContext context = request.getServletContext();
    WebApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(context);
    // 再读取配置文件中的变量
    Environment environment = ctx.getBean(Environment.class);
    String verify = environment.getProperty("你在yaml文件中的变量");

//    @Value("${XXX.verify}")
//    public  String verify;