Problems reading/writing UTF-8 data in MySQL from Java using JDBC connector 5.1
Solution 1
A little late but this will help you:
DriverManager.getConnection(
"jdbc:mysql://" + host + "/" + dbName
+ "?useUnicode=true&characterEncoding=UTF-8", user, pass);
Solution 2
At some point in the chain, UTF-8–encoded bytes are being decoded with Latin1. From the list of your settings, it appears this is happening at "character_set_server". Without knowing how these values were obtained, it is hard to interpret them.
Check the value of the system property "file.encoding". If that is not "UTF-8", then you need to explicitly specify "UTF-8" as the character encoding whenever you decode bytes to characters. For example, when you call a String
constructor with a byte[]
, or use an InputStreamReader
.
It is best to explicitly specify character encodings, rather than rely on the default platform encoding.
Solution 3
You can set the file.encoding
property of your JVM to UTF-8 so all locale/encoding sensitive API will consider decoded Strings as UTF8.
For example, you can set it in your command line that launches your Java app:
java -Dfile.encoding=UTF-8 ....
You can also refer to this SO question for a complete explanation of Tomcat setup.
Admin
Updated on January 18, 2020Comments
-
Admin over 4 years
I have a scenario with two MySQL databases (in UTF-8), a Java code (a Timer Service) that synchronize both databases (reading form first of them and writing/updating to second) and a Web application that lets modify data loaded in the second database.
All database access is made using IBATIS (but I detect that I have the same problem using JDBC,
PreparedStatement
s andResultSet
s)When my java code reads data from first database, I obtain characters like
'ó'
when really it must be'ó'
. This data is wroten without modifications to the second database.Later, when I see the loaded data in my web application, I see the extrange character despite the
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
.If I decode the data using ...
new String(data.getBytes("UTF-8"));
... I visualize correctly the character (ó). But I can not use this solution as a general rule because when I modify data using web application form, the data is not updated in UTF-8 in my second database (despite the database is UTF-8 and my connection string is using characterEncoding, characterSetResults and useUnicode parameters).
From my Java code I obtain the following Database settings:
character_set_client-->utf8 character_set_connection-->utf8 character_set_database-->utf8 character_set_filesystem-->binary character_set_results-->utf8 character_set_server-->latin1 character_set_system-->utf8 character_sets_dir-->/usr/local/mysql51/share/mysql/charsets/
the character_set_server setting can't be changed and I don't know what I am doing wrong!!
How can I read UTF-8 data from MySQL using JDBC connector (
mysql-connector-java-5.1.5-bin.jar
)?Is the problem with reading data from the first database or writing to the second database?