java接收json数组转成字符串、对象转json、json字符串转list

方法一

@Slf4j
public class test {
    public static void main(String[] args) {
        String json = "[\"偏好零售\",\"偏好金融\",\"偏好教育\"]";
        JSONArray objects = null;
        try {
            objects = JSONObject.parseArray(json);
        } catch (Exception e) {
            log.info("e:{}", e);
        }
        String s = objects.toString();
        String replace = s.replace("[", "");
        String replace1 = replace.replace("\"", "");
        String replace2 = replace1.replace("]", "");
        System.out.println(replace2);

    }
}

方法二

@Slf4j
public class test {
    public static void main(String[] args) {
        String json = "[\"偏好零售\",\"偏好金融\",\"偏好教育\"]";
        JSONArray objects = JSONArray.parseArray(json);
        StringBuilder sb = new StringBuilder();
        for (Object object : objects) {
            sb.append(object + ",");
        }
        sb = sb.delete(sb.length() - 1, sb.length());
        System.out.println(sb);


//        JSONArray objects = null;
//        try {
//            objects = JSONObject.parseArray(json);
//        } catch (Exception e) {
//            log.info("e:{}", e);
//        }
//        String s = objects.toString();
//        String replace = s.replace("[", "");
//        String replace1 = replace.replace("\"", "");
//        String replace2 = replace1.replace("]", "");
//        System.out.println(replace2);

    }
}

最后都是得到

偏好零售,偏好金融,偏好教育

补充：对象转json
JSON.toJSONString(product)

public class MetadataTest {
    public static void main(String[] args) {
        KeyValue keyValue = new KeyValue();
        keyValue.setKey("reportInstanceId");
        keyValue.setValue("219836400005213");
        String jsonString = JSON.toJSONString(keyValue);
        System.out.println(jsonString);

        String reportId = "219836400005213";
        String s = JSON.toJSONString(reportId);
        System.out.println("===" + s);
    }
}

3///json字符串转list

String paramScores = "[\n" +
                "    {\n" +
                "        \"key\": 1,\n" +
                "        \"valueType\": 1,\n" +
                "        \"value\": \"100\",\n" +
                "        \"score\": 6\n" +
                "    },\n" +
                "    {\n" +
                "        \"key\": 2,\n" +
                "        \"valueType\": 3,\n" +
                "        \"value\": \"10-20\",\n" +
                "        \"score\": 1\n" +
                "    }\n" +
                "]";
        List<ParamScore> paramScore = JSONArray.parseArray(paramScores, ParamScore.class);
        System.out.println(paramScore);

其他方法

Shop shop = JSONUtil.toBean(shopJson, Shop.class);

反过来 JSONUtil.toJsonStr(shop);