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String json = EntityUtils.toString(response.getEntity(), "UTF-8");

 拿到的json字符串如下 

{"workItemList":[{"workItemId":102347,"workItemName":"申请人录入","workItemType":"man","currentState":12,"bizState":0,"assistant":"admin","participant":"admin","limitTime":0.0,"activityDefId":"Act_1","activityInstId":102676,"processInstId":102273,"startTime":"2019-01-09 00:00:00.000","endTime":"2019-01-09 00:00:00.000","shardingId":102273,"tenantId":"csp"}],"pageTotal":1}

我现在需要"workItemList"对应的值

JSONObject jsonObject = JSONObject.parseObject(json);            String r = jsonObject.getString("workItemList");

控制台打印字符串r,可以看见取到了

[{"bizState":0,"assistant":"admin","workItemType":"man","workItemId":102347,"activityDefId":"Act_1","activityInstId":102676,"participant":"admin","limitTime":0.0,"processInstId":102273,"tenantId":"csp","startTime":"2019-01-09 00:00:00.000","endTime":"2019-01-09 00:00:00.000","workItemName":"申请人录入","currentState":12,"shardingId":102273}]

然后把这个转成List  ,WorkItem是我自己的类，用的时候换一下

List
   
     object = (List
    
     )JSONArray.parseArray(r, WorkItem.class);
    
   

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