前言

和切面一样，在项目中同样使用了自定义注解，目前项目中使用的自定义注解主要分为以下一些方面：controller参数解析，缓存方法声明，导入功能中的POJO声明。

@JsonObject

用在controller的方法参数，解析前台提交的json参数，组装成java对象。用法如下：

@PostMapping("/bas/user/status/toggle")    public PackVo toggleUserStatus(@JsonObject Long[] userIds , @JsonObject Long status ){        ...     }

注解声明

@Target(ElementType.PARAMETER)@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface JsonObject {    String value() default "";    boolean required() default true;}

注解处理,实现HandlerMethodArgumentResolver，

public class JsonArgumentResolver implements HandlerMethodArgumentResolver {    public static Logger logger = LoggerFactory.getLogger(JsonArgumentResolver.class);    @Override    public boolean supportsParameter(MethodParameter methodParameter) {        return methodParameter.hasParameterAnnotation(JsonObject.class);    }    @Override    public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory)            throws Exception {        try {            JSONObject para = getRequestInfo(nativeWebRequest);            Class
     type = methodParameter.getParameterType();            String name = methodParameter.getParameterName();            //获取参数注解JsonObject,如果为空，则使用参数名，不为空，则使用注解中的value            Annotation[] annotations = methodParameter.getParameterAnnotations();            for(Annotation annotation : annotations){                if(annotation instanceof JsonObject){                    String value = ((JsonObject) annotation).value();                    if(StringUtils.isNotEmpty(value)){                        name = value;                    }                }            }            if (null != para && para.containsKey(name)) {                if (String.class.equals(type)) {                    return para.getString(name);                }                if (List.class.equals(type)) {                    String typeName = methodParameter.getGenericParameterType().getTypeName();                    typeName = typeName.substring(typeName.indexOf("<")+1);                    typeName =typeName.substring(0,typeName.length()-1);                    return JSON.parseArray(para.getString(name), Class.forName(typeName));                }                return JSON.parseObject(para.getString(name), type);            }        } catch (Exception e) {            e.printStackTrace();            logger.info("",e);        }        return null;    }    private JSONObject getRequestInfo(NativeWebRequest webRequest) throws IOException {        JSONObject para = new JSONObject();        HttpServletRequest httpServletRequest = webRequest.getNativeRequest(HttpServletRequest.class);        String method = httpServletRequest.getMethod();        if (!method.equals("GET") && !method.equals("DELETE")) {            if (null != httpServletRequest.getAttribute("para")) {                try {                    para = JSON.parseObject(httpServletRequest.getAttribute("para").toString());                } catch (Exception e) {                    e.printStackTrace();                    logger.info("",e);                }            } else {                StringBuilder buffer = new StringBuilder();                BufferedReader reader = httpServletRequest.getReader();                String line;                while ((line = reader.readLine()) != null) {                    buffer.append(line);                }                httpServletRequest.setAttribute("para", buffer.toString());                try {                    para = JSON.parseObject(buffer.toString());                } catch (Exception e) {                    e.printStackTrace();                    logger.info("",e);                }            }        } else {            Map
    
      parameterMap = webRequest.getParameterMap();            for (Map.Entry
     
       entry : parameterMap.entrySet()) {                String key = entry.getKey();                String values = StringUtils.join(entry.getValue());                para.put(key, values);            }        }        return para;    }}
     
    

@RedisCache

接口使用方式如下：

注解声明，具体的注解处理在上一篇的DAO切面中有写到。

@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)@Documented@Componentpublic @interface RedisCache {    String value() default "";    boolean required() default true;}