maven 项目（四） spring集成springMVC开发统一接入API（准备工作：第一部分）

第一部分：通过自定义Annotation,获取所有Controller的Url

1、自定义Annotation接口：

@Target({ ElementType.TYPE, ElementType.METHOD })@Retention(RetentionPolicy.RUNTIME)public @interface FunctionCode {String value();String descript();}

2、普通接口一般写法（知道为毛这么爱用接口吗：度娘一下）：

public interface JdpushService {    ApiResponse<HashMap<String,Object>> doJdpush(ApiRequest apiRequest) throws Throwable;}

2.1 在需要获取Url的Controller上加上自定义Annotation

@FunctionCode(value = "jdpush", descript = "推送相关API")@Servicepublic class JdpushServiceImpl implements JdpushService {    @FunctionCode(value = "jdpush.doJdpush", descript = "推送处理接口")    @Override    public ApiResponse<HashMap<String,Object>> doJdpush(ApiRequest apiRequest) throws Exception  {        ApiResponse<HashMap<String,Object>> apiResponse =null;        boolean flag=false;        try {                flag=Jdpush.SendPush("这是一条推送消息");            }            if (flag==true) {                apiResponse = new ApiResponse<HashMap<String, Object>>(RestResultEnum.SUCCESS, 1, hashMap);            }else{                apiResponse = new ApiResponse<HashMap<String, Object>>(RestResultEnum.FAIL, 1, hashMap);            }        }catch (Exception ex){            ex.printStackTrace();            apiResponse=new ApiResponse<HashMap<String,Object>>(RestResultEnum.UNKNOW_ERROR);        }        return apiResponse;    }

2.2  利用Java反射原理读取Annotation

public class SpringBeanProxy { private static ApplicationContext applicationContext; private static Map<String, Object> functionCodeBeanMap = new HashMap<String, Object>(); private static Map<String, Method> functionCodeMethodMap = new HashMap<String, Method>(); private static Map<String, String> functionCodeCatalogMap = new HashMap<String, String>(); private static Map<String, Map<String, String>> functionCodeListMap = new HashMap<String, Map<String, String>>();       //公共静态方法：项目启动。初始化加载Annotation的接口 public synchronized static void setApplicationContext(ApplicationContext arg0) {applicationContext = arg0;Map<String, Object> tempMap = applicationContext.getBeansWithAnnotation(FunctionCode.class);//读取注解beanif (tempMap != null && tempMap.size() > 0) {for (Map.Entry<String, Object> entry : tempMap.entrySet()) {Object bean = entry.getValue();FunctionCode beanFc = bean.getClass().getAnnotation(FunctionCode.class);//反射beanif (beanFc != null) {String beanFunctionCode = beanFc.value();//读取定义的值functionCodeBeanMap.put(beanFunctionCode, bean);functionCodeCatalogMap.put(beanFunctionCode, beanFc.descript());//构造目录结构Method[] methodArr = bean.getClass().getDeclaredMethods();//获取类或接口声明的所有方法if (methodArr != null && methodArr.length > 0) {Map<String, String> methodFunctionCodeMap = new HashMap<String, String>();for (Method method : methodArr) {FunctionCode methodFc = method.getAnnotation(FunctionCode.class);if (methodFc != null) {String methodFunctionCode = methodFc.value();functionCodeMethodMap.put(methodFunctionCode, method);//code对应方法methodFunctionCodeMap.put(methodFunctionCode, methodFc.descript());//code对应描述}}functionCodeListMap.put(beanFunctionCode, methodFunctionCodeMap);//code对应对象}}}} } public static Object getBean(String beanName) { return applicationContext.getBean(beanName); } public static Object getBeanByFunctionCode(String functionCode) { return functionCodeBeanMap.get(functionCode); } public static Method getMethodByFunctionCode(String functionCode) { return functionCodeMethodMap.get(functionCode); } public static Map<String, String> getFunctionCodeCatalogMap() { return functionCodeCatalogMap; } public static Map<String, Map<String, String>> getFunctionCodeListMap() { return functionCodeListMap; } }

注：以上代买的意义是讲Annotation的类和方法加载map中。

好处自然，就是在获取的时候不用再次加载；map作为类似缓存，方便取值；

这行代码以后将会出现：

public static Object getBeanByFunctionCode(String functionCode) {
return functionCodeBeanMap.get(functionCode);
}