java反射泛型異常:argument type mismatch解決方案

最近使用java反射泛型的時候出現異常:argument type mismatch，經過debug排查終於解決，廢話不說，直接上代碼：

javabean及相應的執行函數如下所示：

public class RequestUploadXmlData<T> {private Root<T> root;/** * @return the root */public Root<T> getRoot() {return root;}/** * @param root *            the root to set */public void setRoot(Root<T> root) {this.root = root;}}

public class Root<T> {private T vehispara;/** * @return the vehispara */public T getVehispara() {return vehispara;}/** * @param vehispara the vehispara to set */public void setVehispara(T vehispara) {this.vehispara = vehispara;}}

public <T> String upload(String jkid, String WriteXmlDoc, Class<T> obj, Object objDao) throws Exception {JSONObject xmlJSONObj = XML.toJSONObject(WriteXmlDoc);RequestUploadXmlData<T> requestUploadXmlData = JsonUtil.fromRequest(xmlJSONObj.toString(),new TypeToken<RequestUploadXmlData<T>>() {}.getType(), "yyyy-MM-dd HH:mm:ss"); String webResult = WebServiceUtil.upload("", jkid, WriteXmlDoc);xmlJSONObj = XML.toJSONObject(webResult);UploadResult uploadResult = JsonUtil.fromRequest(xmlJSONObj.toString(), UploadResult.class);/** 如果上傳成功則插入資料 */if (CustomData.CODE_SUCCESS.equals(uploadResult.getRoot().getHead().getCode())) {Class<? extends Object> objClass = objDao.getClass();Method declaredMethod = objClass.getMethod("insert", obj);T vehispara = requestUploadXmlData.getRoot().getVehispara();declaredMethod.invoke(objDao, vehispara);/*tdlxxDao.insert(requestUploadXmlData.getRoot().getVehispara());*/}return webResult;}

執行後報異常：java.lang.IllegalArgumentException: argument type mismatch

解決方案

public <T> String upload(String jkid, String WriteXmlDoc, Class<T> obj, Object objDao) throws Exception {JSONObject xmlJSONObj = XML.toJSONObject(WriteXmlDoc);RequestUploadXmlData<T> requestUploadXmlData = JsonUtil.fromRequest(xmlJSONObj.toString(),new TypeToken<RequestUploadXmlData<T>>() {}.getType(), "yyyy-MM-dd HH:mm:ss"); String webResult = WebServiceUtil.upload("", jkid, WriteXmlDoc);xmlJSONObj = XML.toJSONObject(webResult);UploadResult uploadResult = JsonUtil.fromRequest(xmlJSONObj.toString(), UploadResult.class);/** 如果上傳成功則插入資料 */if (CustomData.CODE_SUCCESS.equals(uploadResult.getRoot().getHead().getCode())) {Class<? extends Object> objClass = objDao.getClass();Method declaredMethod = objClass.getMethod("insert", obj);/** 使用json進行類型轉換，避免getVehispara返回map<String>導致異常：argument type mismatch */String json = JsonUtil.toJson(requestUploadXmlData.getRoot().getVehispara());T vehispara = JsonUtil.fromRequest(json, obj);declaredMethod.invoke(objDao, vehispara);/*tdlxxDao.insert(requestUploadXmlData.getRoot().getVehispara());*/}return webResult;}

原因是requestUploadXmlData.getRoot().getVehispara()返回的是map<String>類型，導致類型不符，至於為什麼是這種類型，抱歉，目前沒時間研究，我也不知道。