我有一个JSON输入，要写入Hbase
这方面的一个例子是
{
"contributors": null,
"truncated": false,
"text": "#Care #MichelleNunn #Stop #Pimping #Haiti #HurricaneMatthew #Give #Answers #Blacklivesmatter https:\/\/t.co\/mmlOawLdCy",
"is_quote_status": false,
"in_reply_to_status_id": null,
"id": 8.4878269282513e+17,
"favorite_count": 0,
"entities": {
"symbols": [
],
"user_mentions": [
],
"hashtags": [
{
"indices": [
0,
5
],
"text": "Care"
},
{
"indices": [
6,
19
],
"text": "MichelleNunn"
},
{
"indices": [
20,
25
],
"text": "Stop"
},
{
"indices": [
26,
34
],
"text": "Pimping"
},
{
"indices": [
35,
41
],
"text": "Haiti"
},
{
"indices": [
42,
59
],
"text": "HurricaneMatthew"
},
{
"indices": [
60,
65
],
"text": "Give"
},
{
"indices": [
66,
74
],
"text": "Answers"
},
{
"indices": [
75,
92
],
"text": "Blacklivesmatter"
}
],
"urls": [
],
"media": [
{
"expanded_url": "https:\/\/twitter.com\/skri_ar\/status\/848782692825128961\/photo\/1",
"display_url": "pic.twitter.com\/mmlOawLdCy",
"url": "https:\/\/t.co\/mmlOawLdCy",
"media_url_https": "https:\/\/pbs.twimg.com\/media\/C8d7XE2XsAAiIsY.jpg",
"id_str": "848782691151622144",
"sizes": {
"large": {
"h": 618,
"resize": "fit",
"w": 986
},
"small": {
"h": 426,
"resize": "fit",
"w": 680
},
"medium": {
"h": 618,
"resize": "fit",
"w": 986
},
"thumb": {
"h": 150,
"resize": "crop",
"w": 150
}
},
"indices": [
93,
116
],
"type": "photo",
"id": 8.4878269115162e+17,
"media_url": "http:\/\/pbs.twimg.com\/media\/C8d7XE2XsAAiIsY.jpg"
}
]
},
"retweeted": false,
"coordinates": null,
"source": "<a href=\"https:\/\/ifttt.com\" rel=\"nofollow\">IFTTT<\/a>",
"in_reply_to_screen_name": null,
"in_reply_to_user_id": null,
"retweet_count": 0,
"id_str": "848782692825128961",
"favorited": false,
"user": {
"follow_request_sent": false,
"has_extended_profile": false,
"profile_use_background_image": true,
"default_profile_image": false,
"id": 7.8840475360896e+17,
"profile_background_image_url_https": null,
"verified": false,
"translator_type": "none",
"profile_text_color": "333333",
"profile_image_url_https": "https:\/\/pbs.twimg.com\/profile_images\/788412708530061313\/gqwMR-0g_normal.jpg",
"profile_sidebar_fill_color": "DDEEF6",
"entities": {
"description": {
"urls": [
]
}
},
"followers_count": 15,
"profile_sidebar_border_color": "C0DEED",
"id_str": "788404753608957956",
"profile_background_color": "F5F8FA",
"listed_count": 15,
"is_translation_enabled": false,
"utc_offset": null,
"statuses_count": 25793,
"description": "",
"friends_count": 0,
"location": "",
"profile_link_color": "1DA1F2",
"profile_image_url": "http:\/\/pbs.twimg.com\/profile_images\/788412708530061313\/gqwMR-0g_normal.jpg",
"following": false,
"geo_enabled": false,
"profile_banner_url": "https:\/\/pbs.twimg.com\/profile_banners\/788404753608957956\/1476807236",
"profile_background_image_url": null,
"screen_name": "skri_ar",
"lang": "en",
"profile_background_tile": false,
"favourites_count": 0,
"name": "Ar Skri",
"notifications": false,
"url": null,
"created_at": "Tue Oct 18 15:41:56 +0000 2016",
"contributors_enabled": false,
"time_zone": null,
"protected": false,
"default_profile": true,
"is_translator": false
},
"geo": null,
"in_reply_to_user_id_str": null,
"possibly_sensitive": false,
"lang": "und",
"created_at": "Mon Apr 03 06:22:18 +0000 2017",
"in_reply_to_status_id_str": null,
"place": null,
"extended_entities": {
"media": [
{
"expanded_url": "https:\/\/twitter.com\/skri_ar\/status\/848782692825128961\/photo\/1",
"display_url": "pic.twitter.com\/mmlOawLdCy",
"url": "https:\/\/t.co\/mmlOawLdCy",
"media_url_https": "https:\/\/pbs.twimg.com\/media\/C8d7XE2XsAAiIsY.jpg",
"id_str": "848782691151622144",
"sizes": {
"large": {
"h": 618,
"resize": "fit",
"w": 986
},
"small": {
"h": 426,
"resize": "fit",
"w": 680
},
"medium": {
"h": 618,
"resize": "fit",
"w": 986
},
"thumb": {
"h": 150,
"resize": "crop",
"w": 150
}
},
"indices": [
93,
116
],
"type": "photo",
"id": 8.4878269115162e+17,
"media_url": "http:\/\/pbs.twimg.com\/media\/C8d7XE2XsAAiIsY.jpg"
}
]
},
"metadata": {
"iso_language_code": "und",
"result_type": "recent"
}
}
现在我编写了一个scala脚本，它接受单个值并将其存储到Hbase中。但是，如果使用“text”值，则会抛出类似org.json4s.package$MappingException: Did not find value which can be converted into java.lang.String的错误
解析JSON文件的scala脚本如下：
def parse_json(json_string: String, collection_name: String, collection_Id: String ):(ImmutableBytesWritable, Put) = {
val json_object = parse(json_string)
//printIn(json_object)
val id = (json_object \ "id_str").extract[String]
val favorite_count = (json_object \ "favorite_count").extract[String]
val retweet_count = (json_object \ "retweet_count").extract[String]
val text = (json_object \ "text").extract[String]
put.add(Bytes.toBytes("tweet"),Bytes.toBytes("text"), Bytes.toBytes(text))
请帮我解决此错误，因为如果我评论文字行，所有其他字段都已正确插入HBase
答案 0 :(得分：0)
最佳extract[]，其类型与JSON完全相同。如果您需要其他类型，您仍然可以转换它。看到favorite_count是一个Int（没有引号）：
"favorite_count": 0,
...
"retweet_count": 0,
最好用
val favorite_count = (json_object \ "favorite_count").extract[Int]
val retweet_count = (json_object \ "retweet_count").extract[Int]
或者如果您确实需要它们作为字符串添加.toString
希望这会有所帮助。
根据@SergGr的建议，添加try / catch总是一个好主意。