Jni json處理 parson的高級使用

Jni json處理 parson的使用

構造json

extern "C" JNIEXPORT jstring JNICALL
Java_com_dds_parson_Parson_test(
        JNIEnv *env,
        jclass clazz) {
    char *serialized_string = 0;
    // 包裝一段jsonObject
    JSON_Value *root_value = json_value_init_object();
    
    // 設置簡單參數
    json_object_set_string(json_object(root_value), "name", "大大帥");
    json_object_set_number(json_object(root_value), "age", 27);
    json_object_set_string(json_object(root_value), "occupation", "Programmer");
    
    // 設置內聯參數
    json_object_dotset_string(json_object(root_value), "address.city", "Cupertino");
    
    // 設置數組
    json_object_dotset_value(json_object(root_value), "sub.habbit",
                             json_parse_string(R"(["dsdssd","dsdsd","sdsdsd"])"));
    json_object_dotset_value(json_object(root_value), "contact.emails",
                             json_parse_string(R"(["[e-mail]","[e-mail]"])"));

    // 導入object
    JSON_Value *pJsonSub = json_value_init_object();
    json_object_set_value(json_object(root_value), "address", pJsonSub);
    json_object_set_string(json_object(pJsonSub), "dds", "ddssingsong");

    // 導入array
    pJsonSub = json_value_init_array();
    json_object_set_value(json_object(root_value), "links", pJsonSub);

    JSON_Value *pJsonSubSub = json_value_init_object();
    json_array_append_value(json_array(pJsonSub), pJsonSubSub);
    json_object_set_string(json_object(pJsonSubSub), "dds", "ddssingsong");
    json_object_set_string(json_object(pJsonSubSub), "address", "https://baidu.com");
    pJsonSubSub = json_value_init_object();
    json_object_set_string(json_object(pJsonSubSub), "dds", "ddssingsong");
    json_object_set_string(json_object(pJsonSubSub), "address", "https://baidu.com");

    serialized_string = json_serialize_to_string_pretty(root_value);
    json_value_free(root_value);

    return env->NewStringUTF(serialized_string);
}

需要解析的對象

public class User {

    private String name;
    private String occu;
    private ArrayList<String> habbits;

    public User() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getOccu() {
        return occu;
    }

    public void setOccu(String occu) {
        this.occu = occu;
    }

    public List<String> getHabbits() {
        return habbits;
    }

    public void setHabbits(ArrayList<String> habbits) {
        this.habbits = habbits;
    }


}

解析json

extern "C"
JNIEXPORT jobject JNICALL
Java_com_dds_parson_Parson_parseJson(JNIEnv *env, jclass clazz, jstring json) {
    JSON_Value *root_value;
    char g_log_info[200];
    // 解析傳入的json
    const char *cJson = env->GetStringUTFChars(json, JNI_FALSE);
    root_value = json_parse_string(cJson);

    // 獲取根類型 object/array
    JSON_Value_Type jsonValueType = json_value_get_type(root_value);

    if (jsonValueType == JSONObject) {
        JSON_Object *jsonObject = json_value_get_object(root_value);

        // 獲取其中一個參數
        const char *name = json_object_get_string(jsonObject, "name");
        sprintf(g_log_info, "%s", name);
        LOGD("name : %s", g_log_info);

        // 獲取其中一個參數
        const char *occu = json_object_get_string(jsonObject, "occupation");
        sprintf(g_log_info, "%s", occu);
        LOGD("occupation : %s", g_log_info);

        // 反射類
        jclass userClass = env->FindClass("com/dds/parson/User");
        //反射構造方法
        jmethodID constructMethod = env->GetMethodID(userClass, "<init>", "()V");

        if (userClass == NULL || constructMethod == NULL) {
            return NULL;
        }
        // 構造對象
        jobject user = env->NewObject(userClass, constructMethod);
        // 設置參數
        jmethodID setName = env->GetMethodID(userClass, "setName", "(Ljava/lang/String;)V");
        jmethodID setOccu = env->GetMethodID(userClass, "setOccu", "(Ljava/lang/String;)V");
        jstring jName = env->NewStringUTF(name);
        env->CallVoidMethod(user, setName, jName);
        jstring jOccu = env->NewStringUTF(occu);
        env->CallVoidMethod(user, setOccu, jOccu);


        jmethodID setHabbit = env->GetMethodID(userClass, "setHabbits", "(Ljava/util/ArrayList;)V");
        if (setHabbit == NULL) {
            LOGD("setHabbit method is NULL");
            return NULL;
        }
        jclass listClass = env->FindClass("java/util/ArrayList");
        jmethodID list_init = env->GetMethodID(listClass, "<init>", "(I)V");
        jobject listObject = env->NewObject(listClass, list_init,4);
        jmethodID list_add = env->GetMethodID(listClass, "add",
                                              "(Ljava/lang/Object;)Z");
        if (listClass == NULL || list_init == NULL) {
            LOGD("listClass is NULL");
            return NULL;
        }
        if (list_add == NULL) {
            LOGD("add method is NULL");
            return NULL;
        }

        // 獲取array並打印長度
        JSON_Array *habbits = json_object_dotget_array(jsonObject, "sub.habbit");
        size_t size = json_array_get_count(habbits);
        LOGD("size %d", (int) size);

        size_t a = 0;
        for (a = 0; a < size; a++) {
            const char *ha = json_array_get_string(habbits, a);
            sprintf(g_log_info, "%s", ha);
            LOGD("habbit %d: %s", a, g_log_info);
            jstring haa = env->NewStringUTF(ha);

            bool flag = env->CallBooleanMethod(listObject, list_add, haa);
            LOGD("flag:%d", flag);
        }
        env->CallVoidMethod(user, setHabbit, listObject);

        json_value_free(root_value);
        return user;

    }
    return NULL;


}