在json中解析尾随字符 [英] trailing characters getting parsed in json

问题描述

我正在尝试检查json是否有效，并且遇到异常行为. 当我将某些字符附加到可解析的json时，杰克逊和gson都在解析它，并且它们忽略了结尾的字符.我想检查json是否严格有效.请帮忙.我在mapper.configure()中尝试了几个标志，但是找不到确切的设置.

I am trying to check if json is valid and I am experiencing a bizzare behaviour. When I append some characters to a parsable json both jackson and gson are parsing it and they ignore the trailing charaters. I want to check if the json is strictly valid. Please help. I tried a couple of flags in mapper.configure() but I couldn't find the exact setting.

import com.google.gson.JsonParser;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.ObjectMapper;

public class JSONUtil {
    public static void main(String[] args) {
        String jsonStr = "{\"outputValueSchemaFormat\": \"\",\"sortByIndexInRecord\": 0,\"sortOrder\":\"descending\"}opdfahf";
        System.out.println(JSONUtil.isValidJson(jsonStr));
    }
    public static boolean isValidJson(String str) {
        try {
             final ObjectMapper mapper  = new ObjectMapper();
             mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, true);
             mapper.readTree(str);
         System.out.println(str);
             new JsonParser().parse(str);

        } catch (Exception e) {
            return false;
        }
            return true;
        }
}

PS:此问题不同于

PS: This question is different from this because i have used the same code but it seems that either the library has some bug or some configuration flag is missing. I tried a couple of configuration flag but none seems to work.

推荐答案

在论坛上进行了一些研究之后，我发现了一个有趣的链接，其中有人遇到了同样的问题.团队的回应是

After some research on the forums i found an interesting link someone who had the same problem. The response from the team was

是的.这是设计使然.如果要解决此类问题，则需要构造JsonParser，并手动进行升级.存在多个根级别的值不认为是有效性问题，但是在您的情况下，将捕获不匹配']'的流末尾.

Yes. This is by design. If you want to catch such problems, you need to construct JsonParser, advance it manually. Existence of multiple root-level values is not considered a validity problem, but in your case, end-of-stream without matching ']' would be caught.

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