推荐收藏系列：Spring boot 2.x注解Annotation大全（持续更新....）

@Service //组件注入，注明为service组件
@Scope("prototype")//声明Scope为Prototype
public class UseFunctionService {
    @Autowired //默认按type注入
    @Qualifier("functionService") //精确注入
    FunctionService functionService;
    @Resource(name="baseDao")//默认按name注入，可以通过name和type属性进行选择性注入
    private BaseDao baseDao;
    @Inject
    @Qualifier("userServiceImpl") //精确注入  
    public IUserService userService;  
    @PostConstruct//执行完构造函数后执行
    public postConstruct(){
        System.out.println("postConstruct");
    }
    @PreDestroy//在销毁Bean前执行
    public perDestroy(){
         System.out.println("perDestroy");
    }
    @Autowired   
    public void setUserDao(@Qualifier("userDao") UserDao userDao) {   
     this.userDao = userDao;   
    }  
    public String SayHello(String word){
        return functionService.sayHello(word);
    }
}
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@Configuration
//@SpringBootConfiguration
@ComponentScan(value="com.cn",ComponentDefaultFilters=true,
  includeFilters={
    @Filter(type=FilterType.ANNOTATION,classes={Controller.class}),
    @Filter(type=FilterType.CUSTOM,classes={MyTypeFilter.class})
})
@ImportResource("classpath:condition.xml")//导入xml配置
@Import(ConditionConfig.class)//导入ConditionConfig Class，并会实例化到容器中以及ConditionConfig中的配置也一起注入
public class Config {
     @Value("I Love You!") //注入普通字符
    private String normal;
    @Value("#{systemProperties['os.name']}") //注入操作系统属性
    private String osName;
    @Value("#{ T(java.lang.Math).random() * 100.0 }") //注入表达式运算结果
    private double randomNumber;
    @Value("#{demoService.another}") //注入其他Bean的属性
    private String fromAnother;
    @Value("classpath:org/light4j/sping4/usually/el/test.txt") //注入文件内容
    private Resource testFile;
    @Value("http://www.baidu.com") //注入网址内容
    private Resource testUrl;
    @Value("${book.name}") //注入属性文件
    private String bookName;
    @Bean//加载bean
    @Conditional(WindowsCondition.class) // 通过@Conditional注解，符合Windows条件则true
    @ConditionalOnResource(resources="classpath:windows.ini")//在类路径下是否存在windows.ini文件，存在为true,最后进行注解与操作，为true实例化Bean
    public ListService windowsListService(){
        return new WindowsListService();
    }
    @Bean
    @ConditionalOnClass(LinuxCondition.class) // 通过@ConditionalOnClass注解，符合Linux条件则true
    @ConditionalOnProperty(name = "synchronize", havingValue = "true"))//如果synchronize在配置文件中并且值为true
    public ListService linuxListService(){
        return new LinuxListService();
    }
    //加载配置文件中前缀为spring.datasource的属性
     @ConfigurationProperties(prefix = "spring.datasource")
      public DataSource jwcDataSource() {
         return DataSourceBuilder.create().build();
    }
    @Bean
    @ConditionalOnMissingClass({LinuxCondition.class,WindowsCondition.class})//当容器中缺失这两个Class时为true
    @Profile("dev")//在dev环境下为true  最后结果为注解和之与，true实例化该Bean
    public ListService macListService(){
        return new MacListService();
    }
}
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@Aspect //声明该类是一个切面
 @Component 
public class LogAspect {
    private final String POINT_CUT ="execution(* org.sping4.ccww.aop.DemoMethodService.*(..))";
    @Pointcut("@annotation(org.ccww.sping4.base.aop.Action)") //声明切面
     public void annotationPointCut(){};
     @After("annotationPointCut()") //声明一个建言，并使用@Pointcut定义的切点
    public void after(JoinPoint joinPoint) {
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        Action action = method.getAnnotation(Action.class); 
        System.out.println("注解式拦截 " + action.name()); //⑤
    }
     @Before("execution(* org.sping4.ccww.aop.DemoMethodService.*(..))")//声明一个建言，此建言直接使用拦截规则作为参数
      public void before(JoinPoint joinPoint){
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        System.out.println("方法规则式拦截,"+method.getName());
    }
    /**
    * 后置返回
    * 如果第一个参数为JoinPoint，则第二个参数为返回值的信息
    * 如果第一个参数不为JoinPoint，则第一个参数为returning中对应的参数
    * returning：限定了只有目标方法返回值与通知方法参数类型匹配时才能执行后置返回通知，否则不执行，
    * 参数为Object类型将匹配任何目标返回值
    */
    @AfterReturning(value = POINT_CUT,returning = "result")
    public void doAfterReturningAdvice1(JoinPoint joinPoint,Object result){
         System.out.println("第一个后置返回通知的返回值："+result);
    }
}
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@Controller //声明此类是一个控制器
@RequestMapping("/ccww") //映射此类的访问路径是/ccww
//@RestController // 使用@RestController，声明是控制器，并且返回数据时不需要@ResponseBody
//@RequestMapping("/ccww")
public class DemoAnnoController {
    //此方法未标注路径，因此使用类级别的路径/anno;produces可定制返回的response的媒体类型和字符集，或返回值是json对象，则设置porduces="application/json;charset=UTF-8"
    @RequestMapping(produces = "text/plain;charset=UTF-8")  
    public @ResponseBody String index(HttpServletRequest request) { //可接受HttpServletRequest作为参数，当然也可以接受HttpServletResponse作为参数。此处的@ResponseBody用在返回值前
        return "url:" + request.getRequestURL() + " can access";
    }
    @RequestMapping(value = "/demoPathVar/{str}", produces = "text/plain;charset=UTF-8")// 
    public @ResponseBody String demoPathVar(@PathVariable String str, //接受路径参数，并在方法参数前结合@PathVariable使用，访问路径为/ccww/demoPathVar/xxx
            HttpServletRequest request) {
        return "url:" + request.getRequestURL() + " can access,str: " + str;
    }
    //常规的request参数获取，访问路径为/ccww/requestParam?id=1
    @RequestMapping(value = "/requestParam", produces = "text/plain;charset=UTF-8") 
    public @ResponseBody String passRequestParam(Long id,
            HttpServletRequest request) {
        return "url:" + request.getRequestURL() + " can access,id: " + id;
    }
    @RequestMapping(value = "/obj", produces = "application/json;charset=UTF-8")
    @ResponseBody // 可注解在方法上
    public String passObj(DemoObj obj, HttpServletRequest request) {
         return "url:" + request.getRequestURL() 
                    + " can access, obj id: " + obj.getId()+" obj name:" + obj.getName();
    }
    //映射不同的路径到相同的方法，访问路径为/anno/name1或/anno/name2
    @RequestMapping(value = { "/name1", "/name2" }, produces = "text/plain;charset=UTF-8")
    public @ResponseBody String remove(HttpServletRequest request) {
        return "url:" + request.getRequestURL() + " can access";
    }
     @RequestMapping(value = "/helloWorld") 
     //以“user”为名称添加到模型对象中供视图页面展示使用
    public String helloWorld(@ModelAttribute User user) { 
     return "helloWorld"; 
    } 
}
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@Configuration
@EnableWebSecurity//开启webSecurityConfig
@EnableGlobalMethodSecurity(prePostEnabled = true.securedEnabled = true)//可开启多个注解
public class WebSecurityConfig extends WebSecurityConfigurerAdapter{
    .....
}
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@Secured("IS_AUTHENTICATED_ANONYMOUSLY")//@Secured注解，匿名访问
public Account readAccount(Long id){
    ...
}
@Secured("ROLE_TELLER")//@Secured注解具有TELLER访问
public Account readAccount(Long id){
    ...
}
@PreAuthorize("#userId==authentication.principal.userId or hasAuthority('ADMIN')")
//利用Spring Security的@P标注参数，或者Spring Data的@Param标注参数来接收@PreAuthorize的返回值
public void changPassword(@P("userId")long userId){
  ...
 }
@PreAuthorize("hasAuthority('ADMIN')")//PreAuthorize是否具有admin角色
public void changePassword(long userId){
...
}
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