java - com.fasterxml.jackson.core.JsonParseException : Unexpected character ('\' (code 92)) [Java]

Question

我对这个困惑的标题深感抱歉，但我完全不明白为什么会发生这种情况。

我正在尝试使用 Jackson 解析 JSON 字符串。我的代码很简单:

import com.fasterxml.jackson.databind.ObjectMapper;
import formatter.Tweet;
import com.fasterxml.jackson.databind.DeserializationFeature;
public class FormatterTester {


static String tweet = "{\"created_at\":\"Fri May 03 11:43:17 +0000 2019\",\"id\":1124278249620566017,\"id_str\":\"1124278249620566017\",\"text\":\"RT @entkom: '\\u0e40\\u0e0b\\u0e49\\u0e19\\u0e15\\u0e4c-\\u0e28\\u0e38\\u0e20\\u0e1e\\u0e07\\u0e29\\u0e4c' \\u0e41\\u0e08\\u0e01\\u0e04\\u0e27\\u0e32\\u0e21\\u0e19\\u0e48\\u0e32\\u0e23\\u0e31\\u0e01 \\u0e21\\u0e2d\\u0e1a\\u0e04\\u0e27\\u0e32\\u0e21\\u0e2a\\u0e38\\u0e02\\u0e43\\u0e2b\\u0e49\\u0e41\\u0e1f\\u0e19\\u0e04\\u0e25\\u0e31\\u0e1a https:\\/\\/t.co\\/hBbi5hzEH8\",\"source\":\"\\u003ca href=\\\"http:\\/\\/twitter.com\\/download\\/android\\\" rel=\\\"nofollow\\\"\\u003eTwitter for Android\\u003c\\/a\\u003e\",\"truncated\":false,\"in_reply_to_status_id\":null,\"in_reply_to_status_id_str\":null,\"in_reply_to_user_id\":null,\"in_reply_to_user_id_str\":null,\"in_reply_to_screen_name\":null,\"user\":{\"id\":1062336001941504001,\"id_str\":\"1062336001941504001\",\"name\":\"\\ud83d\\udc0a\\u26bd\\ud83d\\udc2f\\ud83c\\udfb8\\ud83d\\udc99sugajin\\/\\/\\ud83d\\udc9a\\ud83d\\udc7b\\ud83d\\udc32\\ud83d\\udc0a\",\"screen_name\":\"sugajinBTS1\",\"location\":null,\"url\":null,\"description\":\"#BTS\\u597d\\u304d\\ud83d\\udc95\\u30b8\\u30f3\\u30cb\\u30e0\\u3088\\u308a\\u306e\\uff75\\uff99\\uff8d\\uff9f\\uff9d\\n#LGBTQ\\u304c\\u3082\\u3063\\u3068\\u7406\\u89e3\\u3055\\u308c\\u3066\\u6b32\\u3057\\u3044\\n#lovebychance\\u306e\\u6cbc\\u306b\\u30cf\\u30de\\u308a\\u4e2d\\n#season2\\u3068\\u3063\\u3066\\u3082\\u671f\\u5f85\\uff01\\uff01\\n#PinSon\\u2665SonPin\\n#2wish\\ud83d\\udc99\\ud83d\\udc9a\\n#Magus\\n#TeamReal\\n#LBCForever\\n\\u7121\\u8a00\\u30d5\\u30a9\\u30ed\\u30fc\\u5931\\u793c\\u3057\\u307e\\u3059\\ud83d\\ude47\",\"translator_type\":\"none\",\"protected\":false,\"verified\":false,\"followers_count\":61,\"friends_count\":224,\"listed_count\":0,\"favourites_count\":37785,\"statuses_count\":11611,\"created_at\":\"Tue Nov 13 13:26:54 +0000 2018\",\"utc_offset\":null,\"time_zone\":null,\"geo_enabled\":false,\"lang\":\"ja\",\"contributors_enabled\":false,\"is_translator\":false,\"profile_background_color\":\"F5F8FA\",\"profile_background_image_url\":\"\",\"profile_background_image_url_https\":\"\",\"profile_background_tile\":false,\"profile_link_color\":\"1DA1F2\",\"profile_sidebar_border_color\":\"C0DEED\",\"profile_sidebar_fill_color\":\"DDEEF6\",\"profile_text_color\":\"333333\",\"profile_use_background_image\":true,\"profile_image_url\":\"http:\\/\\/pbs.twimg.com\\/profile_images\\/1062337509701513216\\/5HFkKxoi_normal.jpg\",\"profile_image_url_https\":\"https:\\/\\/pbs.twimg.com\\/profile_images\\/1062337509701513216\\/5HFkKxoi_normal.jpg\",\"profile_banner_url\":\"https:\\/\\/pbs.twimg.com\\/profile_banners\\/1062336001941504001\\/1543643861\",\"default_profile\":true,\"default_profile_image\":false,\"following\":null,\"follow_request_sent\":null,\"notifications\":null},\"geo\":null,\"coordinates\":null,\"place\":null,\"contributors\":null,\"retweeted_status\":{\"created_at\":\"Fri May 03 01:29:52 +0000 2019\",\"id\":1124123879654301696,\"id_str\":\"1124123879654301696\",\"text\":\"'\\u0e40\\u0e0b\\u0e49\\u0e19\\u0e15\\u0e4c-\\u0e28\\u0e38\\u0e20\\u0e1e\\u0e07\\u0e29\\u0e4c' \\u0e41\\u0e08\\u0e01\\u0e04\\u0e27\\u0e32\\u0e21\\u0e19\\u0e48\\u0e32\\u0e23\\u0e31\\u0e01 \\u0e21\\u0e2d\\u0e1a\\u0e04\\u0e27\\u0e32\\u0e21\\u0e2a\\u0e38\\u0e02\\u0e43\\u0e2b\\u0e49\\u0e41\\u0e1f\\u0e19\\u0e04\\u0e25\\u0e31\\u0e1a https:\\/\\/t.co\\/hBbi5hzEH8\",\"source\":\"\\u003ca href=\\\"http:\\/\\/twitter.com\\\" rel=\\\"nofollow\\\"\\u003eTwitter Web Client\\u003c\\/a\\u003e\",\"truncated\":false,\"in_reply_to_status_id\":null,\"in_reply_to_status_id_str\":null,\"in_reply_to_user_id\":null,\"in_reply_to_user_id_str\":null,\"in_reply_to_screen_name\":null,\"user\":{\"id\":69565234,\"id_str\":\"69565234\",\"name\":\"ent_komchadluek\",\"screen_name\":\"entkom\",\"location\":null,\"url\":null,\"description\":null,\"translator_type\":\"none\",\"protected\":false,\"verified\":false,\"followers_count\":6684,\"friends_count\":1115,\"listed_count\":86,\"favourites_count\":14,\"statuses_count\":31813,\"created_at\":\"Fri Aug 28 11:28:17 +0000 2009\",\"utc_offset\":null,\"time_zone\":null,\"geo_enabled\":false,\"lang\":\"en\",\"contributors_enabled\":false,\"is_translator\":false,\"profile_background_color\":\"FF6699\",\"profile_background_image_url\":\"http:\\/\\/abs.twimg.com\\/images\\/themes\\/theme11\\/bg.gif\",\"profile_background_image_url_https\":\"https:\\/\\/abs.twimg.com\\/images\\/themes\\/theme11\\/bg.gif\",\"profile_background_tile\":true,\"profile_link_color\":\"B40B43\",\"profile_sidebar_border_color\":\"CC3366\",\"profile_sidebar_fill_color\":\"E5507E\",\"profile_text_color\":\"362720\",\"profile_use_background_image\":true,\"profile_image_url\":\"http:\\/\\/pbs.twimg.com\\/profile_images\\/471687167\\/ent1_normal.jpg\",\"profile_image_url_https\":\"https:\\/\\/pbs.twimg.com\\/profile_images\\/471687167\\/ent1_normal.jpg\",\"default_profile\":false,\"default_profile_image\":false,\"following\":null,\"follow_request_sent\":null,\"notifications\":null},\"geo\":null,\"coordinates\":null,\"place\":null,\"contributors\":null,\"is_quote_status\":false,\"quote_count\":9,\"reply_count\":33,\"retweet_count\":584,\"favorite_count\":505,\"entities\":{\"hashtags\":[],\"urls\":[{\"url\":\"https:\\/\\/t.co\\/hBbi5hzEH8\",\"expanded_url\":\"http:\\/\\/www.komchadluek.net\\/news\\/ent\\/370511#.XMuZj_HCjrY.twitter\",\"display_url\":\"komchadluek.net\\/news\\/ent\\/37051\\u2026\",\"indices\":[52,75]}],\"user_mentions\":[],\"symbols\":[]},\"favorited\":false,\"retweeted\":false,\"possibly_sensitive\":false,\"filter_level\":\"low\",\"lang\":\"th\"},\"is_quote_status\":false,\"quote_count\":0,\"reply_count\":0,\"retweet_count\":0,\"favorite_count\":0,\"entities\":{\"hashtags\":[],\"urls\":[{\"url\":\"https:\\/\\/t.co\\/hBbi5hzEH8\",\"expanded_url\":\"http:\\/\\/www.komchadluek.net\\/news\\/ent\\/370511#.XMuZj_HCjrY.twitter\",\"display_url\":\"komchadluek.net\\/news\\/ent\\/37051\\u2026\",\"indices\":[64,87]}],\"user_mentions\":[{\"screen_name\":\"entkom\",\"name\":\"ent_komchadluek\",\"id\":69565234,\"id_str\":\"69565234\",\"indices\":[3,10]}],\"symbols\":[]},\"favorited\":false,\"retweeted\":false,\"possibly_sensitive\":false,\"filter_level\":\"low\",\"lang\":\"th\",\"timestamp_ms\":\"1556883797446\"}";

public static void main(String[]args) {

    String valor_retorno= null;
    Tweet tw;

    try {

        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

        tw = objectMapper.readValue(tweet, Tweet.class);

        System.out.println("Check 3 - El formatter retorna:\n"+tw.toString());

        valor_retorno = tw.toString();
    }  catch (Exception e) {
        e.printStackTrace();
        System.out.println("\nException " + e.getClass() + ": " + e.getMessage());
    } finally {
        System.out.println("\nReturn: Valor_retorno = "+valor_retorno);
    }

}

} 如果您运行该代码，您会发现它运行良好。那问题出在哪里呢？我必须在 Oracle NoSQL 数据库上执行相同的操作。了解与数据检索相关的任何部分并不重要，因为它们工作正常，我已经测试过它们。代码非常相似:

String data = new String(value.toByteArray(),StandardCharsets.UTF_8);
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objectMapper.configure(Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
tw = objectMapper.readValue(data, Tweet.class);

我的目标是获得与第一个代码完全相同的结果。由“|”分隔的值的字符串根据我的类(class)推文的属性。

但是，此代码被压缩在 Jar 文件中，并由数据库在记录的所有推文上内部运行。我看不到发生了什么，也无法调试它，但它会产生以下异常:

com.fasterxml.jackson.core.JsonParseException: Illegal character ((CTRL-CHAR, code 0)): only regular white space (\r, \n, \t) is allowed between tokens

我尝试使用 StringEscapeUtils.escapeJava(data); 对字符串“data”进行转义 然后会产生以下异常:

com.fasterxml.jackson.core.JsonParseException: Unexpected character ('\' (code 92)): expected a valid value (number, String, array, object, 'true', 'false' or 'null') I've also tried scaping the string like this data.replace('\'', ' '); without success.

经过多次测试，我无法理解为什么它在我首先放在这里的演示上运行良好，而不是在具有完全相同的依赖项的实际项目上运行良好。

Answer 1

出于某种原因，Jackson 无法解析我从数据库检索到的内容。这很可能是由于我的 Docker 容器用来保存数据库以及调用和执行脚本的 CentOS 中存在编码或解码问题。

最后，使用 Gson 进行解析是最好的选择，尽管如果不修剪()字符串，它仍然会产生错误。显然，由于某种原因，JSON 被引用了两次。这是“JSON 文本”。

代码:

package formatter;

import java.io.*;
import java.lang.String;
import java.nio.charset.StandardCharsets;
import java.util.List;

import oracle.kv.*;
import com.google.gson.Gson;
import oracle.kv.KeyValueVersion;
import oracle.kv.exttab.Formatter;

public class TweetFormatter implements Formatter {

    public TweetFormatter() {
        super();
    }

    public String toOracleLoaderFormat(final KeyValueVersion kvv, final KVStore kvStore){

        String valor_retorno= null;

        Tweet tw; //antes sin null

        BufferedWriter bf = FormatterUtils.getInstance().getWriter();

        try {
            final Key key = kvv.getKey();
            final Value value = kvv.getValue();
            Value.Format format = value.getFormat();

            FormatterUtils.getInstance().writeLine(bf,"[Key: "+ key + ", Value:" +value.toByteArray()+ "]" + ". Format= "+ format.toString());

            //Filtrar Clave
            List<String> major = key.getMajorPath();

            FormatterUtils.getInstance().writeLine(bf,"Check 1:\n Key is: "+key + "\n Key length is: "+major.size()
                    + "\n Values are: "+major.toString() + "\n contains: "+major.contains("TweeterStream"));

            Boolean contains = false;

            for(String x : major) {
                if(x.equals("TweeterStream")||x.equals("/TweeterStream")||x.equals("/TweeterStream/")) {
                    contains = true;
                    break;
                }
            }

            //Parsear
            if(contains){

                String data = new String(value.toByteArray(),StandardCharsets.UTF_8);

                data = data.trim();
                tw = new Gson().fromJson(data,Tweet.class); //FUNCIONA

                FormatterUtils.getInstance().writeLine(bf,"Check 3 - El formatter retorna:\n"+tw.toString());
                valor_retorno = tw.toString();
            }else{
                FormatterUtils.getInstance().writeLine(bf,"\nEstoy en else");
            }
            FormatterUtils.getInstance().writeLine(bf,"\nestoy fuera del if-else");
        }  catch (Exception e) {
            e.printStackTrace();
            FormatterUtils.getInstance().writeLine(bf, "\nException " + e.getClass() + ": " + e.getMessage());
        } finally {
            FormatterUtils.getInstance().writeLine(bf,"\nReturn: Valor_retorno = "+valor_retorno);
            FormatterUtils.getInstance().generateLog(bf);
        }
        return valor_retorno;
    }