Fastjson BeanToArray
2022-05-06 15:36 更新
在fastjson中,支持一种叫做BeanToArray的映射模式。普通模式下,JavaBean映射成json object,BeanToArray模式映射为json array。
Sample 1
class Mode { public int id; public int name; } Model model = new Model(); model.id = 1001; model.name = "gaotie"; // {"id":1001,"name":"gaotie"} String text_normal = JSON.toJSONString(model); // [1001,"gaotie"] String text_beanToArray = JSON.toJSONString(model, SerializerFeature.BeanToArray); // support beanToArray & normal mode JSON.parseObject(text_beanToArray, Feature.SupportArrayToBean);
上面的例子中,BeanToArray模式下,少了Key的输出,节省了空间,json字符串较小,性能也会更好。
Sample 2
BeanToArray可以局部使用,比如:
class Company { public int code; public List<Department> departments = new ArrayList<Department>(); } @JSONType(serialzeFeatures=SerializerFeature.BeanToArray, parseFeatures=Feature.SupportArrayToBean) class Department { public int id; public Stirng name; public Department() {} public Department(int id, String name) {this.id = id; this.name = name;} } Company company = new Company(); company.code = 100; company.departments.add(new Department(1001, "Sales")); company.departments.add(new Department(1002, "Financial")); // {"code":10,"departments":[[1001,"Sales"],[1002,"Financial"]]} String text = JSON.toJSONString(commpany);
在这个例子中,如果Company的属性departments元素很多,局部采用BeanToArray就可以获得很好的性能,而整体又能够获得较好的可读性。
Sample 3
上一个例子也可以这样写:
class Company { public int code; @JSONField(serialzeFeatures=SerializerFeature.BeanToArray, parseFeatures=Feature.SupportArrayToBean) public List<Department> departments = new ArrayList<Department>(); }
性能
使用BeanToArray模式,可以获得媲美protobuf的性能。
create ser deser total size +dfl
protobuf 244 2297 1296 3593 239 149
json/fastjson_array/databind 123 1289 1567 2856 281 163
msgpack/databind 122 1525 2180 3705 233 146
json/fastjson/databind 120 2019 2610 4629 486 262
json/jackson+afterburner/databind 118 2142 3147 5289 485 261
json/jackson/databind 124 2914 4411 7326 485 261
这里的json/fastjson_array/databind就是fastjson启用BeanToArray模式,total性能比protobuf好,请看fastjson Benchmark
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