Created
February 1, 2012 10:00
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JsonActionInterceptor
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| package com.klopaj.interceptor; | |
| import com.klopaj.domain.Poi; | |
| import com.klopaj.interceptor.meta.JsonAction; | |
| import com.klopaj.interceptor.meta.JsonIn; | |
| import flexjson.JSONDeserializer; | |
| import flexjson.JSONSerializer; | |
| import jodd.madvoc.ActionRequest; | |
| import jodd.madvoc.interceptor.ActionInterceptor; | |
| import jodd.servlet.ServletUtil; | |
| import javax.servlet.http.HttpServletRequest; | |
| import java.lang.reflect.Field; | |
| import java.lang.reflect.Method; | |
| import java.util.*; | |
| public class JsonActionInterceptor extends ActionInterceptor { | |
| @Override | |
| public Object intercept(ActionRequest actionRequest) throws Exception { | |
| HttpServletRequest request = actionRequest.getHttpServletRequest(); | |
| Object action = actionRequest.getAction(); | |
| Method method = actionRequest.getActionConfig().getActionClassMethod(); | |
| if (method.isAnnotationPresent(JsonAction.class)) { | |
| // if this is a json action, get all @JsonIn fields, and try to parse them from input | |
| String jsonStringValue = ServletUtil.readRequestBody(request); | |
| Object fieldValues = new JSONDeserializer<Object>().deserialize(jsonStringValue); | |
| Field[] fields = action.getClass().getDeclaredFields(); | |
| for (Field field : fields) { | |
| if (field != null) { | |
| if (field.isAnnotationPresent(JsonIn.class)) { | |
| // This field is marked as @JsonIn meaning it should be in the content of the response | |
| Class fieldType = field.getType(); | |
| if (fieldType == String.class || fieldType.isPrimitive()) { | |
| // it's simple string, just try to get that value from json | |
| Object fieldValue = getFieldValue(field.getName(), fieldValues); | |
| field.setAccessible(true); | |
| field.set(action, fieldValue); | |
| } else if (fieldType.isArray()) { | |
| // Do some array magic | |
| } else if (fieldType.isEnum()) { | |
| // Convert value to enum | |
| } else if (List.class.isAssignableFrom(fieldType)) { | |
| // Handle lists and similar | |
| System.out.println("It's a collection"); | |
| List fieldValue = (List) getFieldValue(field.getName(), fieldValues); | |
| field.setAccessible(true); | |
| field.set(action, fieldValue); | |
| for (Object object : fieldValue) { | |
| if (object != null) { | |
| System.out.println("Collection item " + object); | |
| } | |
| } | |
| } else { | |
| // Most likely this is a POJO. | |
| Object fieldValue = getFieldValue(field.getName(), fieldValues); | |
| String objectSerialized = new JSONSerializer().exclude("*.class").serialize(fieldValue); | |
| Object fieldValueObject = new JSONDeserializer().deserialize(objectSerialized, fieldType); | |
| field.setAccessible(true); | |
| field.set(action, fieldValueObject); | |
| } | |
| } | |
| } | |
| } | |
| } | |
| return actionRequest.invoke(); | |
| } | |
| private Object getFieldValue(String fieldName, Object fieldValues) { | |
| if (fieldValues instanceof List) { | |
| List listFieldValue = (List) fieldValues; | |
| } else if (fieldValues instanceof Map) { | |
| Map mapFieldValue = (Map) fieldValues; | |
| return mapFieldValue.get(fieldName); | |
| } else { | |
| // some primitive type? | |
| } | |
| return null; | |
| } | |
| } |
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