需求

现在返回json数据带有分页的数据，将返回data属性数据变更为content，数据不变，key发生变化

在这里插入图片描述

实现1，源数据比较复杂，组装数据比较麻烦

说明：如果使用这种方式完成需求，需要创建对象，一个和PageInfo一样的对象，list属性修改为content，其他拷贝过去就行了。
但是，如果数据量10w左右，还是按照这种方式，json转换比较耗时，这种方式虽然麻烦，效率快一点。

    @Test
    public void t2(){
        log.info("需求：k1变为k2,value不变");
        Map<String, Object> map = new HashMap<>();
        map.put("k1","v1");
        log.info("修改前");
        for (Map.Entry<String, Object> entry : map.entrySet()) {
            log.info("key:【{}】，value:【{}】",entry.getKey(),entry.getValue());
        }
        String pendingItem  = map.get("k1").toString();
        map.remove("k1");
        map.put("k2",pendingItem);
        log.info("修改后");
        for (Map.Entry<String, Object> entry : map.entrySet()) {
            log.info("key:【{}】，value:【{}】",entry.getKey(),entry.getValue());
        }
    }

Connected to the target VM, address: ‘127.0.0.1:5463’, transport: ‘socket’
20:12:41.966 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - 需求：k1变为k2,value不变
20:12:41.984 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - 修改前
20:12:41.984 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - key:【k1】，value:【v1】
20:12:41.989 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - 修改后
20:12:41.990 [main] INFO com.geekmice.springbootselfexercise.NoDaoTest - key:【k2】，value:【v1】
Disconnected from the target VM, address: ‘127.0.0.1:5463’, transport: ‘socket’

实现2，通过工具类json转换，注意数据量大时候不建议使用

        String listSTR = "{\n" +
                "\t\t\"startRow\": 3,\n" +
                "\t\t\"navigatepageNums\": [1, 2],\n" +
                "\t\t\"prePage\": 1,\n" +
                "\t\t\"hasNextPage\": false,\n" +
                "\t\t\"nextPage\": 0,\n" +
                "\t\t\"pageSize\": 2,\n" +
                "\t\t\"endRow\": 3,\n" +
                "\t\t\"list\": [{\n" +
                "\t\t\t\"teacherName\": \"小2\",\n" +
                "\t\t\t\"teacherNo\": \"6\",\n" +
                "\t\t\t\"categoryId\": 9999\n" +
                "\t\t}],\n" +
                "\t\t\"pageNum\": 2,\n" +
                "\t\t\"navigatePages\": 8,\n" +
                "\t\t\"total\": 3,\n" +
                "\t\t\"navigateFirstPage\": 1,\n" +
                "\t\t\"pages\": 2,\n" +
                "\t\t\"size\": 1,\n" +
                "\t\t\"isLastPage\": true,\n" +
                "\t\t\"hasPreviousPage\": true,\n" +
                "\t\t\"navigateLastPage\": 2,\n" +
                "\t\t\"isFirstPage\": false\n" +
                "\t}";
        
        JSONObject jsonObject1 = JSONObject.parseObject(listSTR);
        Object newList = jsonObject1.get("list");
        jsonObject1.remove("list");
        jsonObject1.put("content", newList);