Java - 从String中删除\ u0000

Question

我正在使用Twitter API,我有以下字符串,这是Proyecto de ingeniera comercial, actual Profesora de matemáticas \u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000Enseña Chile
我想在PostgreSql中存储,但\u0000不接受,所以我想替换它.
我尝试使用,string= string.replaceAll("\\u0000", "");但它不起作用.我得到以下内容

String json = TwitterObjectFactory.getRawJSON(user);
System.out.println(json);
json = json.replaceAll("\\u0000", "");
System.out.println(json);

输出(只有重要部分)

Proyecto de ingeniera comercial, actual Profesora de matemáticas \u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000Enseña Chile
Proyecto de ingeniera comercial, actual Profesora de matemáticas \u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000Enseña Chile

如果我把这个部分放在java中的一个字符串中替换有效,但是如果我把它放在一个文本文件中,或者我直接为Twitter读它就不行了
所以我的问题是,如何从字符串中替换\ u0000？
顺便说一句,完整的字符串就是这个

{"utc_offset":null,"friends_count":83,"profile_image_url_https":"https://pbs.twimg.com/profile_images/2636139584/3a8455cd94045fa6980402add14796a9_normal.jpeg","listed_count":1,"profile_background_image_url":"http://abs.twimg.com/images/themes/theme1/bg.png","default_profile_image":false,"favourites_count":0,"description":"Proyecto de ingeniera comercial, actual Profesora de matemáticas \u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000Enseña Chile","created_at":"Sat May 28 14:24:06 +0000 2011","is_translator":false,"profile_background_image_url_https":"https://abs.twimg.com/images/themes/theme1/bg.png","protected":false,"screen_name":"Fsquadritto","id_str":"306825274","profile_link_color":"0084B4","is_translation_enabled":false,"id":306825274,"geo_enabled":false,"profile_background_color":"C0DEED","lang":"es","profile_sidebar_border_color":"C0DEED","profile_location":null,"profile_text_color":"333333","verified":false,"profile_image_url":"http://pbs.twimg.com/profile_images/2636139584/3a8455cd94045fa6980402add14796a9_normal.jpeg","time_zone":null,"url":null,"contributors_enabled":false,"profile_background_tile":false,"entities":{"description":{"urls":[]}},"statuses_count":2,"follow_request_sent":false,"followers_count":36,"profile_use_background_image":true,"default_profile":true,"following":false,"name":"Fiorella Squadritto","location":"","profile_sidebar_fill_color":"DDEEF6","notifications":false,"status":{"in_reply_to_status_id_str":null,"in_reply_to_status_id":null,"possibly_sensitive":false,"coordinates":null,"created_at":"Fri Oct 12 17:40:35 +0000 2012","truncated":false,"in_reply_to_user_id_str":null,"source":"<a href=\"http://instagram.com\" rel=\"nofollow\">Instagram<\/a>","retweet_count":1,"retweeted":false,"geo":null,"in_reply_to_screen_name":null,"entities":{"urls":[{"display_url":"instagr.am/p/QsOQxTNfvQ/","indices":[49,69],"expanded_url":"http://instagr.am/p/QsOQxTNfvQ/","url":"http://t.co/GKziME7N"}],"hashtags":[{"indices":[24,34],"text":"eduinnova"}],"user_mentions":[{"indices":[35,47],"screen_name":"ensenachile","id_str":"57099132","name":"Enseña Chile","id":57099132}],"symbols":[]},"id_str":"256811615171792896","in_reply_to_user_id":null,"favorite_count":1,"id":256811615171792896,"text":"Amando las matemáticas! #eduinnova @ensenachile  http://t.co/GKziME7N","place":null,"contributors":null,"lang":"es","favorited":false}}

Answer 1

string = string.replace("\u0000", ""); // removes NUL chars
string = string.replace("\\u0000", ""); // removes backslash+u0000

具有u-escaping的字符在java源代码级别完成.例如"class"是:

public \u0063lass C {

你也不需要正则表达式.

Answer 2

的第一个参数replaceAll是一个正则表达式，Java 正则表达式引擎理解\uNNNN转义所以

json.replaceAll("\\u0000", "")

将搜索正则表达式 \u0000，它匹配 Unicode NUL 字符 (U+0000) 的实例，而不是实际字符串的实例\u0000。如果要匹配字符串，\u0000则需要使用正则表达式\\u0000，这意味着 Java 字符串文字"\\\\u0000"

json.replaceAll("\\\\u0000", "")

或者更简单地说，使用replace（其第一个参数是文字字符串而不是正则表达式）而不是replaceAll

json.replace("\\u0000", "")