Gson解析json字符串，并封装成List<T>

最近一个项目中，需要将从服务器上获取到的JSON字符串转换为对象，大概研究了一下，发现在项目中很多地方都要用到，而且有的时候需要返回的是一个集合，所以写了个方法，留着自用。

public class JsonUtils {    /**     * 将传入的json字符串按类模板解析成对象     * @param json 需要解析的json字符串     * @param cls 类模板     * @return 解析好的对象     */    public static <T> T getObj(String json,Class<T> cls){        Gson gson = new Gson();        T bean = (T) gson.fromJson(json, cls);        return bean;    }    /**     * 将传入的对象解析成json字符串     * @param bean 需要解析的对象     * @return 解析完成的json字符串     */    public static <T> String getJsonString(T bean){        Gson gson = new Gson();        String json = gson.toJson(bean, bean.getClass());        return json;    }    /**     * 将获取到的json字符串转换为对象集合进行返回     * @param jsonData 需要解析的json字符串     * @param cls 类模板     * @return     */    public <T> List<T> getObjList(String jsonData,Class<T> cls){        List<T> list = new ArrayList<T>();        if (jsonData.startsWith("[") && jsonData.endsWith("]")) {//当字符串以“[”开始，以“]”结束时，表示该字符串解析出来为集合            //截取字符串，去除中括号            jsonData = jsonData.substring(1, jsonData.length() -1);            //将字符串以"},"分解成数组            String[] strArr = jsonData.split("\\},");            //分解后的字符串数组的长度            int strArrLength = strArr.length;            //遍历数组，进行解析，将字符串解析成对象            for (int i = 0; i < strArrLength; i++) {                String newJsonString = null;                if (i == strArrLength -1) {                    newJsonString = strArr[i];                } else {                    newJsonString = strArr[i] + "}";                }                T bean = getObj(newJsonString, cls);                list.add(bean);            }        }        if (list == null || list.size() == 0) {            return null;        }        return list;    }}

这里测试一下,JSON字符串有点长，就放在后面了。

public class Test {    public static void main(String[] args) {        Exposure exp = JsonUtils.getObj(json, Exposure.class);        System.out.println("exp = " + exp);        String myJson = JsonUtils.getJsonString(exp);        System.out.println("myJson = " + myJson);        List<User> userList = JsonUtils.getObjList(listJson, User.class);        for (User user : userList) {            System.out.println("user = " + user);        }    }}public static String json = "{\"Id\": 9928,\"CustomerId\": 9248,\"Remark\": \"大类其他\",\"ExposureItem\": {\"Id\": 20734,\"Has\": true,\"AllergyNames\": null,\"AllergyNamesStr\": \"化学品,毒物,射线,其他\",\"Other\": \"暴露史其他\",\"PropertyName\": \"ExposureItem\",\"Text1\": null,\"Text2\": null,\"Text3\": null,\"Text4\": null,\"Text5\": null,\"Text6\": null,\"Text7\": null,\"Text8\": null,\"Text9\": null,\"Text10\": null,\"Text11\": null,\"Text12\": null,\"Text13\": null,\"Text14\": null,\"Date\": null,\"Remark\": null},\"OccupationalItem\": {\"Id\": 20735,\"Has\": true,\"AllergyNames\": null,\"AllergyNamesStr\": null,\"Other\": null,\"PropertyName\": \"OccupationalItem\",\"Text1\": \"工种\",\"Text2\": null,\"Text3\": \"毒物种类\",\"Text4\": \"1997\",\"Text5\": \"1\",\"Text6\": \"2\",\"Text7\": \"1998\",\"Text8\": \"3\",\"Text9\": \"4\",\"Text10\": null,\"Text11\": null,\"Text12\": null,\"Text13\": null,\"Text14\": null,\"Date\": null,\"Remark\": null}}";    public static String listJson = "[{\"UserId\":9555,\"Name\":\"测试账号\",\"UserType\":\"user\",\"TypeName\":\"VIP金卡\",\"UserTypeId\":4,\"Sex\":0,\"IDCard\":\"110102198506020034\",\"Country\":\"中国\",\"WorkUnit\":\"四川\",\"Phone\":\"02887654321\",\"Mobile\":\"13901234567\",\"QQ\":\"412455414\",\"Mail\":\"[e-mail]\",\"FamilyContact1\":\"张三\",\"FamilyContact2\":\"李四\",\"FamilyContact1Phone\":\"12345678912\",\"FamilyContact2Phone\":\"98765432121\",\"Address\":\"成都市\",\"NearbyHospital\":\"未知\",\"HealthServiceCentre\":\"没有\",\"ResidentType\":2,\"BloodType\":3,\"RHNegative\":2,\"EducationBackground\":5,\"Career\":1,\"Career_Other\":\"\",\"MaritalStatus\":0,\"MedicalPayWayId\":2,\"MedicalPayWay_Other\":\"\",\"SocialSecurityNo\":null,\"CardNo\":\"\",\"Birthday\":\"1985-06-02T00:00:00+08:00\",\"ServiceBuyWayId\":1,\"ServiceBuyWay_Other\":null,\"ExpireTime\":\"2016-03-17T00:00:00+08:00\",\"Height\":\"\",\"Waistline\":\"\",\"Hipline\":\"\",\"Weight\":\"\"},{\"UserId\":9555,\"Name\":\"测试账号\",\"UserType\":\"user\",\"TypeName\":\"VIP金卡\",\"UserTypeId\":4,\"Sex\":0,\"IDCard\":\"110102198506020034\",\"Country\":\"中国\",\"WorkUnit\":\"四川\",\"Phone\":\"02887654321\",\"Mobile\":\"13901234567\",\"QQ\":\"412455414\",\"Mail\":\"[e-mail]\",\"FamilyContact1\":\"张三\",\"FamilyContact2\":\"李四\",\"FamilyContact1Phone\":\"12345678912\",\"FamilyContact2Phone\":\"98765432121\",\"Address\":\"成都市\",\"NearbyHospital\":\"未知\",\"HealthServiceCentre\":\"没有\",\"ResidentType\":2,\"BloodType\":3,\"RHNegative\":2,\"EducationBackground\":5,\"Career\":1,\"Career_Other\":\"\",\"MaritalStatus\":0,\"MedicalPayWayId\":2,\"MedicalPayWay_Other\":\"\",\"SocialSecurityNo\":null,\"CardNo\":\"\",\"Birthday\":\"1985-06-02T00:00:00+08:00\",\"ServiceBuyWayId\":1,\"ServiceBuyWay_Other\":null,\"ExpireTime\":\"2016-03-17T00:00:00+08:00\",\"Height\":\"\",\"Waistline\":\"\",\"Hipline\":\"\",\"Weight\":\"\"},{\"UserId\":9555,\"Name\":\"测试账号\",\"UserType\":\"user\",\"TypeName\":\"VIP金卡\",\"UserTypeId\":4,\"Sex\":0,\"IDCard\":\"110102198506020034\",\"Country\":\"中国\",\"WorkUnit\":\"四川\",\"Phone\":\"02887654321\",\"Mobile\":\"13901234567\",\"QQ\":\"412455414\",\"Mail\":\"[e-mail]\",\"FamilyContact1\":\"张三\",\"FamilyContact2\":\"李四\",\"FamilyContact1Phone\":\"12345678912\",\"FamilyContact2Phone\":\"98765432121\",\"Address\":\"成都市\",\"NearbyHospital\":\"未知\",\"HealthServiceCentre\":\"没有\",\"ResidentType\":2,\"BloodType\":3,\"RHNegative\":2,\"EducationBackground\":5,\"Career\":1,\"Career_Other\":\"\",\"MaritalStatus\":0,\"MedicalPayWayId\":2,\"MedicalPayWay_Other\":\"\",\"SocialSecurityNo\":null,\"CardNo\":\"\",\"Birthday\":\"1985-06-02T00:00:00+08:00\",\"ServiceBuyWayId\":1,\"ServiceBuyWay_Other\":null,\"ExpireTime\":\"2016-03-17T00:00:00+08:00\",\"Height\":\"\",\"Waistline\":\"\",\"Hipline\":\"\",\"Weight\":\"\"}]";

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