【发布时间】:2016-11-01 19:38:33
【问题描述】:
我使用 Twitter4j 抓取了数百万条推文,但令我惊讶的是,所有推文都以原始 json 格式存储。以下是格式化行的示例:
StatusJSONImpl{
createdAt=TueNov0119: 00: 04CET2016,
id=793512948027326464,
text='RT @DylanYamaha_: Et profitez vraiment des personnes qui sont près de vous, parce que sa arrive très très vite un malheur..',
source='<a href="http://twitter.com/download/iphone" rel="nofollow">Twitter for iPhone</a>',
isTruncated=false,
inReplyToStatusId=-1,
inReplyToUserId=-1,
isFavorited=false,
isRetweeted=false,
favoriteCount=0,
inReplyToScreenName='null',
geoLocation=null,
place=null,
retweetCount=0,
isPossiblySensitive=false,
lang='fr',
contributorsIDs=[
],
retweetedStatus=StatusJSONImpl{
createdAt=TueNov0118: 38: 05CET2016,
id=793507418244313088,
text='Et profitez vraiment des personnes qui sont près de vous, parce que sa arrive très très vite un malheur..',
source='<a href="http://twitter.com/download/iphone" rel="nofollow">Twitter for iPhone</a>',
isTruncated=false,
inReplyToStatusId=-1,
inReplyToUserId=-1,
isFavorited=false,
isRetweeted=false,
favoriteCount=56,
inReplyToScreenName='null',
geoLocation=null,
place=null,
retweetCount=175,
isPossiblySensitive=false,
lang='fr',
contributorsIDs=[
],
retweetedStatus=null,
userMentionEntities=[
],
urlEntities=[
],
hashtagEntities=[
],
mediaEntities=[
],
symbolEntities=[
],
currentUserRetweetId=-1,
user=UserJSONImpl{
id=2242998313,
name='_',
screenName='DylanYamaha_',
location='Marseille, France',
description='null',
isContributorsEnabled=false,
profileImageUrl='http://pbs.twimg.com/profile_images/793110090727424002/9bLOivem_normal.jpg',
profileImageUrlHttps='https://pbs.twimg.com/profile_images/793110090727424002/9bLOivem_normal.jpg',
isDefaultProfileImage=false,
url='null',
isProtected=false,
followersCount=12357,
status=null,
profileBackgroundColor='ABB8C2',
profileTextColor='333333',
profileLinkColor='89C9FA',
profileSidebarFillColor='DDEEF6',
profileSidebarBorderColor='FFFFFF',
profileUseBackgroundImage=false,
isDefaultProfile=false,
showAllInlineMedia=false,
friendsCount=87,
createdAt=ThuDec1223: 15: 28CET2013,
favouritesCount=6007,
utcOffset=3600,
timeZone='Amsterdam',
profileBackgroundImageUrl='http://abs.twimg.com/images/themes/theme1/bg.png',
profileBackgroundImageUrlHttps='https://abs.twimg.com/images/themes/theme1/bg.png',
profileBackgroundTiled=false,
lang='fr',
statusesCount=2049,
isGeoEnabled=false,
isVerified=false,
translator=false,
listedCount=43,
isFollowRequestSent=false,
withheldInCountries=null
},
withHeldInCountries=null,
quotedStatusId=-1,
quotedStatus=null
},
userMentionEntities=[
UserMentionEntityJSONImpl{
name='_',
screenName='DylanYamaha_',
id=2242998313
}
],
urlEntities=[
],
hashtagEntities=[
],
mediaEntities=[
],
symbolEntities=[
],
currentUserRetweetId=-1,
user=UserJSONImpl{
id=393519159,
name='Tiphaine.',
screenName='LehmannTiphaine',
location='France',
description='Snapchat : tiphainelehmann | IG : tiphainelmn',
isContributorsEnabled=false,
profileImageUrl='http://pbs.twimg.com/profile_images/777174096958332928/yoz2aPp2_normal.jpg',
profileImageUrlHttps='https://pbs.twimg.com/profile_images/777174096958332928/yoz2aPp2_normal.jpg',
isDefaultProfileImage=false,
url='null',
isProtected=false,
followersCount=145,
status=null,
profileBackgroundColor='000000',
profileTextColor='333333',
profileLinkColor='000000',
profileSidebarFillColor='F3F3F3',
profileSidebarBorderColor='000000',
profileUseBackgroundImage=true,
isDefaultProfile=false,
showAllInlineMedia=false,
friendsCount=200,
createdAt=TueOct1819: 17: 04CEST2011,
favouritesCount=3202,
utcOffset=3600,
timeZone='Paris',
profileBackgroundImageUrl='http://pbs.twimg.com/profile_background_images/753348262/9d241c29a193586d5dc519838bded4c9.jpeg',
profileBackgroundImageUrlHttps='https://pbs.twimg.com/profile_background_images/753348262/9d241c29a193586d5dc519838bded4c9.jpeg',
profileBackgroundTiled=true,
lang='fr',
statusesCount=3462,
isGeoEnabled=true,
isVerified=false,
translator=false,
listedCount=3,
isFollowRequestSent=false,
withheldInCountries=null
},
withHeldInCountries=null,
quotedStatusId=-1,
quotedStatus=null
}
我在解析这些 JSON 字符串时遇到了很多问题。第一个问题是一些推文不止一行。我通过连接同一条推文的行来解决这个问题。然后我必须用 "" 替换所有 StatusJSONImpl 和 UserJSONImploccurrences 以使用 JSONObject 构造函数。
主要问题是如何获取所有推文属性。我用过:
JSONObject jsonObj = new JSONObject(jsonline); //from twitter4j.JSONObject;
但每当推文文本包含“'”之类的字符时,我就有:
twitter4j.JSONException:在 117 [第 118 行第 1 行字符] 处应为“,”或“}”
即使文本不包含“'”,我仍然无法提取推文的时间创建(createdAt)。所以我创建了一个字符串:
String statusFromRaw = "{\"filter_level\": \"low\",";
statusFromRaw+= "\"retweeted\":"+jsonObj.get("isRetweeted")+",";
.....
为了重新创建更清洁的状态,并使用:
Status status = TwitterObjectFactory.createStatus(statusFromRaw);
但在大多数情况下,我在解析许多为空的属性时仍然存在问题。 有什么建议吗?
【问题讨论】:
-
StatusJSONImpl不是原始 JSON,您需要先将状态对象转换为带有TwitterObjectFactory.getRawJSON(status);的 json -
我已经尝试过了,但我遇到了这个异常:
Exception in thread "main" java.lang.IllegalStateException: Apparently jsonStoreEnabled is not set to true.将其设置为 true 为时已晚,因为它应该只执行一次,当调用 TwitterObjectFactory 时。 -
我觉得应该用正则表达式来一一提取属性...
标签: java json parsing twitter4j tweets