GsonでJSONを読み込む

以下はjson列です
login.re={"success":true,"content":[{"machineType":1,"rangeList":["M71813010251-M71813010255"],"activeType":2,"activeId":"121423EBB5DF424B9B0A589AD847C3FA","activeName":"","unActiveType":2,"unActiveId":"C52E42C6E6E64BEBBC2350FA138ACDA2","unActiveName":"","allotTime":"2018-08-13T10:23:07.000+0000","recallTime":null,"canRecall":true},{"machineType":1,"rangeList":["M71813010251-M71813010255"],"activeType":2,"activeId":"121423EBB5DF424B9B0A589AD847C3FA","activeName":"","unActiveType":2,"unActiveId":"C52E42C6E6E64BEBBC2350FA138ACDA2","unActiveName":"","allotTime":"2018-08-13T10:21:41.000+0000","recallTime":null,"canRecall":true},{"machineType":1,"rangeList":["M71813010251-M71813010260"],"activeType":2,"activeId":"121423EBB5DF424B9B0A589AD847C3FA","activeName":"","unActiveType":2,"unActiveId":"C52E42C6E6E64BEBBC2350FA138ACDA2","unActiveName":"","allotTime":"2018-08-13T10:18:42.000+0000","recallTime":null,"canRecall":true},{"machineType":1,"rangeList":["M71813010230-M71813010250"],"activeType":2,"activeId":"121423EBB5DF424B9B0A589AD847C3FA","activeName":"","unActiveType":2,"unActiveId":"B27E2550558C48EF880EC2BD579CD6C0","unActiveName":"","allotTime":"2018-08-13T08:34:57.000+0000","recallTime":null,"canRecall":true},{"machineType":1,"rangeList":["M71813010210-M71813010229"],"activeType":2,"activeId":"121423EBB5DF424B9B0A589AD847C3FA","activeName","unActiveType":2,"unActiveId":"B27E2550558C48EF880EC2BD579CD6C0","unActiveName":"","allotTime":"2018-08-13T04:14:26.000+0000","recallTime":null,"canRecall":true},{"machineType":1,"rangeList":["M 71813010201-M 71813010209"],"activeType":2,"activeId":"121423 EBB 5 DF 424 B 9 B 0 A 589 AD 847 C 3 FA","activeName":","unActiveType":2,"unActiveId":"B 201 D 65 A-A 65 A A 1 AE-4335 A-A-A A A-A 36-B 432323 CEC 95","unActiveName":","allotTime":"2018-08088-08080808088-080808088-088 8 A 24 A 36-A 36-A 36-B 4335 A 36-A 36-A 36-B 432323 CE- 13 T 04:13:05.000+0000","recallTime":null,"canRecoll":true},"message":"クエリ成功","code":"200"}
 
2つのエンティティAおよびBの作成
Aエンティティsuccess content message codeの4つの変数彼らはjson列の変数に対応しなければならなくて、私のJSON列はすべてこの4つの変数の
Bエンティティ:machineType rangeList activeType activeId activeName unActiveType unActiveType unActiveId unActiveName allotTime recallTime canRecollもJSONのkey対応
 
そしてJSONを読み込む必要があるクラスに

Gson gson=new Gson();
// resStr      jspn   
A a=gson.fromJson(resStr,A.class);
System.out.println(a.getMessage());
List list=a.getContent();
for(B b:list){
    System.out.println(b.getAllotTime());
}

これでAllotTimeのすべての値が読み出され、