spring自定义注解！

转载自:http://my.oschina.net/ffy/blog/114015

一下代码适用场景：1.表单 不确定那些需要做防止重复提交 2.Controller 需要传同一个值（不确定那些需要；PS：如果Controller链接地址有规律 可以用Filter统一直接刷到页面）

@interface

/** * 方法级 创建Token * User: Alec * Date: 13-3-15 * Time: 下午2:16 */@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)public @interface Token {}/** * 方法级 检测重复提交 * User: Alec * Date: 13-3-15 * Time: 下午2:16 */@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)public @interface CheckFormToken {}/** * 类级 右边栏 * User: Alec * Date: 13-3-15 * Time: 下午2:52 */@Target(ElementType.TYPE)@Retention(RetentionPolicy.RUNTIME)public @interface RSidebar {}

Interceptor

/** * Created with IntelliJ IDEA. * User: Alec * Date: 13-3-15 * Time: 下午2:21 * To change this template use File | Settings | File Templates. */public class RenderInterceptor implements HandlerInterceptor {    @Autowired    private CategoryService categoryService;    @Autowired    private TagService tagService;    @Autowired    private MenuQueryService menuQueryService;    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {        if (handler.getClass().isAssignableFrom(HandlerMethod.class)) {            HandlerMethod handlerMethod = (HandlerMethod) handler;            Object target = handlerMethod.getBean();            Token token= handlerMethod.getMethodAnnotation(Token.class);            if(token != null ){                this.generateFormToken(request);            }            CheckFormToken checkFormToken = handlerMethod.getMethodAnnotation(CheckFormToken.class);            if (checkFormToken != null) {                if (!checkFormToken(request)) {                    throw new DuplicateSubmitFormException("表单重复提交!");                } else {                    generateFormToken(request);                }            }            if (target.getClass().isAnnotationPresent(RSidebar.class)) {                pageAddRightSidebar(request);            }        }        return true;    }    @Override     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {    }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {    }    private boolean checkFormToken(HttpServletRequest request) {        String token = request.getParameter(SessionConstants.TOKEN);        HttpSession session = request.getSession();        String oldToken = (String) session.getAttribute(SessionConstants.TOKEN);        return token.equals(oldToken);    }    private void generateFormToken(HttpServletRequest request) {        String sessionId = request.getSession().getId();        String hashString = MD5.getHashString(System.currentTimeMillis() + sessionId);        request.getSession().setAttribute(SessionConstants.TOKEN, hashString);    }    /**     * 页面右侧栏     *     * @return     */    private void pageAddRightSidebar(HttpServletRequest request) {        //加入顶级类目        List<Category> categoryBanner = categoryService.querySubCategories(0);        request.setAttribute("categoryBanner", categoryBanner);        //加入标签        List<Tag> tags = tagService.queryAllTag();        request.setAttribute("tags", tags);        //加入一周推荐        List<Menu> menuRecommend = menuQueryService.queryMenuRecommendList();        request.setAttribute("menuRecommend", getMenuListWithMainPicture(menuRecommend));    }}

DuplicateSubmitFormException 自定义表单重复提交异常

/** * 表单重复提交异常 * User: Alec * Date: 13-3-15 * Time: 下午2:49 */public class DuplicateSubmitFormException extends RuntimeException {    private String message;    public DuplicateSubmitFormException(String msg){        this.message = message;    }    public String getMessage() {        return message;    }    public void setMessage(String message) {        this.message = message;    }    @Override    public Throwable fillInStackTrace() {        return this;    }}

表单提交重复提交异常 页面

/** * 表单提交重复提交异常 页面 * User: Alec * Date: 13-3-15 * Time: 下午2:52 */public class SnsExceptionResolver implements HandlerExceptionResolver {    private final Log logger = LogFactory.getLog(HandlerExceptionResolver.class);    private String pagePath = "error/default";    private boolean developModel = false;    @Override    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {        logger.error("发生一个系统异常", ex);        ModelAndView modelAndView = new ModelAndView();        //这里是在发文章的时候        if (ex instanceof DuplicateSubmitFormException) {            modelAndView.setViewName("addArticle");        } else {            modelAndView.addObject("msg", ExceptionUtils.getFullStackTrace(ex));            modelAndView.addObject("developModel", developModel);            modelAndView.setViewName(pagePath);        }        return modelAndView;    }    public String getPagePath() {        return pagePath;    }    public void setPagePath(String pagePath) {        this.pagePath = pagePath;    }    public boolean isDevelopModel() {        return developModel;    }    public void setDevelopModel(boolean developModel) {        this.developModel = developModel;    }}

xml 

<bean class="com.sns.web.utils.SnsExceptionResolver">        <property name="developModel">            <value>${develop}</value>        </property>    </bean>    <mvc:interceptors>        <mvc:interceptor>            <mvc:mapping path="/**"/>            <bean class="com.sns.web.utils.RenderInterceptor"></bean>        </mvc:interceptor>    </mvc:interceptors>

Controller

使用就不写了