FastJson的範型解析相關的幾個demo
阿新 • • 發佈：2018-12-04
fastjson 的確很好用，官網：https://github.com/alibaba/fastjson/wiki/常見問題
但是在解析範型的時候要特別的小心，使用下面的goodExample的方法去解析是最好的
還有就是需要進行範型解析的類，一定不要包含內部了，否者會報錯
package com.example.kodulf.utilsdemo.utils.http.test; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import com.alibaba.fastjson.TypeReference; import com.example.kodulf.utilsdemo.entity.City; import com.example.kodulf.utilsdemo.entity.Flow; import com.example.kodulf.utilsdemo.utils.http.Result; import com.example.kodulf.utilsdemo.utils.http.ResultList; import java.math.BigDecimal; import java.util.ArrayList; import java.util.List; /** * Created by Kodulf on 2017/5/14. * FastJson的測試 * * 為什麼要做這個測試，主要是為了解析範型的，因為專案中Result<T>是使用的範型，解析起來就需要特殊的處理new TypeReference() * 注意了，前面四個方法，怎麼說呢，都相當於已經制定了型別了， * 注意看兩個goodexample，還有就是showCastError * 千萬，千萬要記住，需要解析的類裡面不要使用內部類，否者fastjson 會報錯報錯create instance error, class com.example.kodulf.utilsdemo.entity.City$Flow */ public class FastJsonTest{ //todo 千萬，千萬要記住，需要解析的類裡面不要使用內部類，否者fastjson 會報錯報錯create instance error, class com.example.kodulf.utilsdemo.entity.City$Flow public static void main(String[] args){ //{"reason":"允許充值的手機號碼及金額","result":null,"error_code":0} //{"reason":"success","result":[{"city":"全國","company":"中國聯通","companytype":"1","name":"中國聯通全國流量套餐","type":"1","flows":[{"id":"34","p":"20M","v":"20","inprice":"2.880"},{"id":"1","p":"50M","v":"50","inprice":"5.760"},{"id":"35","p":"100M","v":"100","inprice":"9.600"},{"id":"2","p":"200M","v":"200","inprice":"14.400"},{"id":"36","p":"500M","v":"500","inprice":"28.800"},{"id":"37","p":"1G","v":"1024","inprice":"48.000"}]},{"city":"全國","company":"中國移動","companytype":"2","name":"中國移動全國流量套餐","type":"1","flows":[{"id":"3","p":"10M","v":"10","inprice":"2.985"},{"id":"4","p":"30M","v":"30","inprice":"4.975"},{"id":"5","p":"70M","v":"70","inprice":"9.950"},{"id":"49","p":"100M","v":"100","inprice":"9.950"},{"id":"6","p":"150M","v":"150","inprice":"19.900"},{"id":"50","p":"300M","v":"300","inprice":"19.900"},{"id":"7","p":"500M","v":"500","inprice":"29.850"},{"id":"26","p":"1G","v":"1024","inprice":"49.750"},{"id":"27","p":"2048M","v":"2048","inprice":"69.650"}]},{"city":"全國","company":"中國電信","companytype":"3","name":"中國電信全國流量套餐","type":"1","flows":[{"id":"8","p":"10M","v":"10","inprice":"1.860"},{"id":"9","p":"30M","v":"30","inprice":"4.650"},{"id":"32","p":"50M","v":"50","inprice":"6.510"},{"id":"10","p":"100M","v":"100","inprice":"9.300"},{"id":"11","p":"200M","v":"200","inprice":"13.950"},{"id":"12","p":"500M","v":"500","inprice":"27.900"},{"id":"28","p":"1G","v":"1024","inprice":"46.500"}]}],"error_code":0} // parseTestResultString(); // // parseTestResultCity(); // // parseTestResultListCityList(); // // parseTestResultCityList(); // testError(); // testError2(); showCastError(); // goodExampleToResultGeneric(); // goodExampleToResultListGeneric(); } public static void parseTestResultString(){ String jsonResult = "{\"reason\":\"允許充值的手機號碼及金額\",\"result\":\"hello world\",\"error_code\":0}"; Result<String> result = (Result<String>)JSON.parseObject(jsonResult, new TypeReference<Result<String>>(){}); System.out.println(result.toString()); } public static void parseTestResultCity(){ String jsonResult = "{\"reason\":\"允許充值的手機號碼及金額\",\"result\":{\"city\":\"全國\",\"company\":\"中國聯通\",\"companytype\":\"1\",\"name\":\"中國聯通全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"34\",\"p\":\"20M\",\"v\":\"20\",\"inprice\":\"2.880\"},{\"id\":\"1\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"5.760\"},{\"id\":\"35\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.600\"},{\"id\":\"2\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"14.400\"},{\"id\":\"36\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"28.800\"},{\"id\":\"37\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"48.000\"}]},\"error_code\":0}"; Result<City> result = (Result<City>)JSON.parseObject(jsonResult, new TypeReference<Result<City>>(){}); System.out.println(result.getResult().getCity()); ArrayList<Flow> flows = result.getResult().getFlows(); System.out.println(flows.get(0).getP()); } /** * 測試使用ResultList<City> 獲取citylist */ public static void parseTestResultListCityList(){ String jsonResultList = "{\"reason\":\"success\",\"result\":[{\"city\":\"全國\",\"company\":\"中國聯通\",\"companytype\":\"1\",\"name\":\"中國聯通全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"34\",\"p\":\"20M\",\"v\":\"20\",\"inprice\":\"2.880\"},{\"id\":\"1\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"5.760\"},{\"id\":\"35\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.600\"},{\"id\":\"2\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"14.400\"},{\"id\":\"36\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"28.800\"},{\"id\":\"37\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"48.000\"}]},{\"city\":\"全國\",\"company\":\"中國移動\",\"companytype\":\"2\",\"name\":\"中國移動全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"3\",\"p\":\"10M\",\"v\":\"10\",\"inprice\":\"2.985\"},{\"id\":\"4\",\"p\":\"30M\",\"v\":\"30\",\"inprice\":\"4.975\"},{\"id\":\"5\",\"p\":\"70M\",\"v\":\"70\",\"inprice\":\"9.950\"},{\"id\":\"49\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.950\"},{\"id\":\"6\",\"p\":\"150M\",\"v\":\"150\",\"inprice\":\"19.900\"},{\"id\":\"50\",\"p\":\"300M\",\"v\":\"300\",\"inprice\":\"19.900\"},{\"id\":\"7\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"29.850\"},{\"id\":\"26\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"49.750\"},{\"id\":\"27\",\"p\":\"2048M\",\"v\":\"2048\",\"inprice\":\"69.650\"}]},{\"city\":\"全國\",\"company\":\"中國電信\",\"companytype\":\"3\",\"name\":\"中國電信全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"8\",\"p\":\"10M\",\"v\":\"10\",\"inprice\":\"1.860\"},{\"id\":\"9\",\"p\":\"30M\",\"v\":\"30\",\"inprice\":\"4.650\"},{\"id\":\"32\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"6.510\"},{\"id\":\"10\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.300\"},{\"id\":\"11\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"13.950\"},{\"id\":\"12\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"27.900\"},{\"id\":\"28\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"46.500\"}]}],\"error_code\":0}"; ResultList<City> resultList = (ResultList<City>) JSON.parseObject(jsonResultList, new TypeReference<ResultList<City>>(){}); System.out.println(resultList.toString()); List<City> result1 = resultList.getResult(); for (City city : result1) { System.out.println(city.getCity()); } } /** * 測試解析裡面是ResultList，json 是CityList的 */ public static void parseTestResultCityList(){ String jsonResultList = "{\"reason\":\"success\",\"result\":[{\"city\":\"全國\",\"company\":\"中國聯通\",\"companytype\":\"1\",\"name\":\"中國聯通全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"34\",\"p\":\"20M\",\"v\":\"20\",\"inprice\":\"2.880\"},{\"id\":\"1\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"5.760\"},{\"id\":\"35\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.600\"},{\"id\":\"2\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"14.400\"},{\"id\":\"36\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"28.800\"},{\"id\":\"37\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"48.000\"}]},{\"city\":\"全國\",\"company\":\"中國移動\",\"companytype\":\"2\",\"name\":\"中國移動全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"3\",\"p\":\"10M\",\"v\":\"10\",\"inprice\":\"2.985\"},{\"id\":\"4\",\"p\":\"30M\",\"v\":\"30\",\"inprice\":\"4.975\"},{\"id\":\"5\",\"p\":\"70M\",\"v\":\"70\",\"inprice\":\"9.950\"},{\"id\":\"49\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.950\"},{\"id\":\"6\",\"p\":\"150M\",\"v\":\"150\",\"inprice\":\"19.900\"},{\"id\":\"50\",\"p\":\"300M\",\"v\":\"300\",\"inprice\":\"19.900\"},{\"id\":\"7\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"29.850\"},{\"id\":\"26\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"49.750\"},{\"id\":\"27\",\"p\":\"2048M\",\"v\":\"2048\",\"inprice\":\"69.650\"}]},{\"city\":\"全國\",\"company\":\"中國電信\",\"companytype\":\"3\",\"name\":\"中國電信全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"8\",\"p\":\"10M\",\"v\":\"10\",\"inprice\":\"1.860\"},{\"id\":\"9\",\"p\":\"30M\",\"v\":\"30\",\"inprice\":\"4.650\"},{\"id\":\"32\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"6.510\"},{\"id\":\"10\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.300\"},{\"id\":\"11\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"13.950\"},{\"id\":\"12\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"27.900\"},{\"id\":\"28\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"46.500\"}]}],\"error_code\":0}"; Result<List<City>> listResult = JSON.parseObject(jsonResultList, new TypeReference<Result<List<City>>>() { }); System.out.println(listResult.toString()); List<City> result1 = (List<City>)listResult.getResult(); for (City city : result1) { System.out.println(city.getCity()); } } /** * 錯誤的復現 */ public static void testError(){ String jsonResult = "{\"reason\":\"允許充值的手機號碼及金額\",\"result\":{\"city\":\"全國\",\"company\":\"中國聯通\",\"companytype\":\"1\",\"name\":\"中國聯通全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"34\",\"p\":\"20M\",\"v\":\"20\",\"inprice\":\"2.880\"},{\"id\":\"1\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"5.760\"},{\"id\":\"35\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.600\"},{\"id\":\"2\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"14.400\"},{\"id\":\"36\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"28.800\"},{\"id\":\"37\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"48.000\"}]},\"error_code\":0}"; Result<City> t=parseTest(jsonResult,new Result<City>(),new City()); //只要在這裡是獲取範型裡面的東西的時候，例如這裡是City,獲取city的屬性，一定是會報錯的 try { System.out.println(t.getResult().getCity()); }catch (Exception e){ e.printStackTrace(); } } /** * 測試，這裡面 T ret = (T) tResult;應該是導致錯誤的地方 * 多級範型，解析的時候報錯， * 參考一下：http://blog.csdn.net/lanmo555/article/details/52769372 * 範型的 * @param jsonString * @param t * @param k * @param <K> * @param <T> * @return */ public static <K, T extends Result<K>> T parseTest(String jsonString,T t,final K k){ Result<K> tResult = JSON.parseObject(jsonString, new TypeReference<Result<K>>() { }); System.out.println(tResult.toString()); T ret = (T) tResult; System.out.println(t.getReason()); return ret; } /** * 測試Error2， * * 之前是再City裡面設定了一個內部類flow，如果這樣做的話，就會報錯create instance error, class com.example.kodulf.utilsdemo.entity.City$Flow * * 將這個內部類刪除了以後，重新建立一個類（不是City的內部類），就不會報錯了 */ public static void testError2(){ String jsonResult = "{\"reason\":\"允許充值的手機號碼及金額\",\"result\":{\"city\":\"全國\",\"company\":\"中國聯通\",\"companytype\":\"1\",\"name\":\"中國聯通全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"34\",\"p\":\"20M\",\"v\":\"20\",\"inprice\":\"2.880\"},{\"id\":\"1\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"5.760\"},{\"id\":\"35\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.600\"},{\"id\":\"2\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"14.400\"},{\"id\":\"36\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"28.800\"},{\"id\":\"37\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"48.000\"}]},\"error_code\":0}"; Result<City> t= parseTestFail2(jsonResult,new Result<City>(),new City()); try { System.out.println(t.getResult().getCity()); }catch (Exception e){ e.printStackTrace(); } } public static <K, T extends Result<K>> T parseTestFail2(String jsonString, T t, final K k){ Result<K> responseObject = JSON.parseObject(jsonString, new TypeReference<Result<K>>() { }); System.out.println(responseObject.toString()); //修復的方法 if (responseObject.getResult() != null) { K valueObject = null; Class<?> targetType= k.getClass(); if (targetType == String.class) { valueObject = (K)responseObject.getResult().toString(); } else if ((targetType == Integer.class) || (targetType == Integer.TYPE)) valueObject = (K)Integer.valueOf(responseObject.getResult().toString()); else if ((targetType == Byte.class) || (targetType == Byte.TYPE)) valueObject = (K)Byte.valueOf(responseObject.getResult().toString()); else if ((targetType == Double.class) || (targetType == Double.TYPE)) valueObject = (K)Double.valueOf(responseObject.getResult().toString()); else if ((targetType == Float.class) || (targetType == Float.TYPE)) valueObject = (K)Float.valueOf(responseObject.getResult().toString()); else if ((targetType == Long.class) || (targetType == Long.TYPE)) valueObject = (K)Long.valueOf(responseObject.getResult().toString()); else if ((targetType == Short.class) || (targetType == Short.TYPE)) valueObject = (K)Short.valueOf(responseObject.getResult().toString()); else if (targetType == BigDecimal.class ) valueObject = (K)new BigDecimal(responseObject.getResult().toString()); else{ valueObject = (K) JSONObject.toJavaObject((JSONObject) responseObject.getResult(), k.getClass()); } responseObject.setResult(valueObject); } T ret = (T) responseObject; System.out.println(t.getReason()); return ret; } /** * 簡單的復原CastError的error */ public static void showCastError(){ String jsonResult = "{\"reason\":\"允許充值的手機號碼及金額\",\"result\":{\"city\":\"全國\",\"company\":\"中國聯通\",\"companytype\":\"1\",\"name\":\"中國聯通全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"34\",\"p\":\"20M\",\"v\":\"20\",\"inprice\":\"2.880\"},{\"id\":\"1\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"5.760\"},{\"id\":\"35\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.600\"},{\"id\":\"2\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"14.400\"},{\"id\":\"36\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"28.800\"},{\"id\":\"37\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"48.000\"}]},\"error_code\":0}"; Result<City> result = new Result<>(); showCastError(jsonResult,result); System.out.println(result.getResult().getCity()); } public static <T> void showCastError(String jsonString, Result<T> result){ Result<T> tResult = JSON.parseObject(jsonString, new TypeReference<Result<T>>() { }); if(tResult.getResult()!=null){ result.setResult(tResult.getResult()); } result.setReason(tResult.getReason()); result.setError_code(tResult.getError_code()); } /** * 正確的解析韓歐範型型別的Result的方法的example */ public static void goodExampleToResultGeneric(){ String jsonResult = "{\"reason\":\"允許充值的手機號碼及金額\",\"result\":{\"city\":\"全國\",\"company\":\"中國聯通\",\"companytype\":\"1\",\"name\":\"中國聯通全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"34\",\"p\":\"20M\",\"v\":\"20\",\"inprice\":\"2.880\"},{\"id\":\"1\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"5.760\"},{\"id\":\"35\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.600\"},{\"id\":\"2\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"14.400\"},{\"id\":\"36\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"28.800\"},{\"id\":\"37\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"48.000\"}]},\"error_code\":0}"; Result<City> result = new Result<>(); try { parseJsonStringToResultGeneric(result,jsonResult,new City()); System.out.println(result.getResult().getCity()); } catch (Exception e) { e.printStackTrace(); } } /** * 範型解析為特定類 * @param result * @param responseStr * @param k * @param <K> * @throws Exception */ public static <K> void parseJsonStringToResultGeneric(Result<K> result, String responseStr, K k) throws Exception{ Result<K> responseObject = JSON.parseObject(responseStr, new TypeReference<Result<K>>() { }); if (responseObject.getResult() != null) { K valueObject = null; Class<?> targetType = k.getClass(); if (targetType == String.class) { valueObject = (K) responseObject.getResult().toString(); } else if ((targetType == Integer.class) || (targetType == Integer.TYPE)) valueObject = (K) Integer.valueOf(responseObject.getResult().toString()); else if ((targetType == Byte.class) || (targetType == Byte.TYPE)) valueObject = (K) Byte.valueOf(responseObject.getResult().toString()); else if ((targetType == Double.class) || (targetType == Double.TYPE)) valueObject = (K) Double.valueOf(responseObject.getResult().toString()); else if ((targetType == Float.class) || (targetType == Float.TYPE)) valueObject = (K) Float.valueOf(responseObject.getResult().toString()); else if ((targetType == Long.class) || (targetType == Long.TYPE)) valueObject = (K) Long.valueOf(responseObject.getResult().toString()); else if ((targetType == Short.class) || (targetType == Short.TYPE)) valueObject = (K) Short.valueOf(responseObject.getResult().toString()); else if (targetType == BigDecimal.class) valueObject = (K) new BigDecimal(responseObject.getResult().toString()); else { valueObject = (K) JSONObject.toJavaObject((JSONObject) responseObject.getResult(), k.getClass()); } result.setResult(valueObject); } result.setError_code(responseObject.getError_code()); result.setReason(responseObject.getReason()); } /** * 正確的解析韓歐範型型別的ResultList的方法的example */ public static void goodExampleToResultListGeneric(){ String jsonResultList = "{\"reason\":\"success\",\"result\":[{\"city\":\"全國\",\"company\":\"中國聯通\",\"companytype\":\"1\",\"name\":\"中國聯通全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"34\",\"p\":\"20M\",\"v\":\"20\",\"inprice\":\"2.880\"},{\"id\":\"1\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"5.760\"},{\"id\":\"35\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.600\"},{\"id\":\"2\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"14.400\"},{\"id\":\"36\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"28.800\"},{\"id\":\"37\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"48.000\"}]},{\"city\":\"全國\",\"company\":\"中國移動\",\"companytype\":\"2\",\"name\":\"中國移動全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"3\",\"p\":\"10M\",\"v\":\"10\",\"inprice\":\"2.985\"},{\"id\":\"4\",\"p\":\"30M\",\"v\":\"30\",\"inprice\":\"4.975\"},{\"id\":\"5\",\"p\":\"70M\",\"v\":\"70\",\"inprice\":\"9.950\"},{\"id\":\"49\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.950\"},{\"id\":\"6\",\"p\":\"150M\",\"v\":\"150\",\"inprice\":\"19.900\"},{\"id\":\"50\",\"p\":\"300M\",\"v\":\"300\",\"inprice\":\"19.900\"},{\"id\":\"7\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"29.850\"},{\"id\":\"26\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"49.750\"},{\"id\":\"27\",\"p\":\"2048M\",\"v\":\"2048\",\"inprice\":\"69.650\"}]},{\"city\":\"全國\",\"company\":\"中國電信\",\"companytype\":\"3\",\"name\":\"中國電信全國流量套餐\",\"type\":\"1\",\"flows\":[{\"id\":\"8\",\"p\":\"10M\",\"v\":\"10\",\"inprice\":\"1.860\"},{\"id\":\"9\",\"p\":\"30M\",\"v\":\"30\",\"inprice\":\"4.650\"},{\"id\":\"32\",\"p\":\"50M\",\"v\":\"50\",\"inprice\":\"6.510\"},{\"id\":\"10\",\"p\":\"100M\",\"v\":\"100\",\"inprice\":\"9.300\"},{\"id\":\"11\",\"p\":\"200M\",\"v\":\"200\",\"inprice\":\"13.950\"},{\"id\":\"12\",\"p\":\"500M\",\"v\":\"500\",\"inprice\":\"27.900\"},{\"id\":\"28\",\"p\":\"1G\",\"v\":\"1024\",\"inprice\":\"46.500\"}]}],\"error_code\":0}"; ResultList<City> resultList = new ResultList<>(); try { parseJsonStringToResultListGeneric(resultList,jsonResultList,new City()); System.out.println(resultList.getResult().get(0).getFlows().get(0).getInprice()); } catch (Exception e) { e.printStackTrace(); } } /** * 範型解析為list的 * @param result * @param readString * @param <T> */ public static <T> void parseJsonStringToResultListGeneric(ResultList<T> result, String readString, T t) throws Exception{ ResultList<T> responseObject = JSON.parseObject(readString, new TypeReference<ResultList<T>>() { }); if (responseObject.getResult() != null) { String valueString = JSON.toJSONString(responseObject.getResult()); List<T> values = (List<T>) JSON.parseArray(valueString, t.getClass()); //更新result result.setResult(values); } result.setReason(responseObject.getReason()); result.setError_code(responseObject.getError_code()); } }