https://github.com/alibaba/fastjson/wiki/TypeReference

fastjson 版本 1.2.21

2.1. 单参数例子
 public class Response<T> {
     public T data;
}
public static <T> Response<T> parseToMap(String json, Class<T> type) {
     return JSON.parseObject(json, 
                            new TypeReference<Response<T>>(type) {});
}

我实际应用测试

public class Response<T> {
     public T data;
}
public static <T> Response<T> parseToObj(String json, Class<T> type) {
     return JSON.parseObject(json, 
                            new TypeReference<Response<T>>() {});
}

我如果传入type会出错,不传没问题