在互联网上搜索一下后，我添加了几行到我的application.properties以便使用UTF-8编码，它终于奏效了。这里是文件。不要忘记更改网址和密码等。

 ＃DataSource设置：在这里设置您自己的$ b $配置b＃＃数据库
＃连接。在这个例子中，我们有netgloo_blog作为数据库名称＃和
＃root作为用户名和密码。 
 spring.datasource.url = jdbc：mysql：// localhost：3306 / newDB？useUnicode = yes& characterEncoding = UTF-8& characterSetResults = UTF-8 
 spring.datasource.username = root 
 spring.datasource.password = somePassword 

＃保持连接长时间闲置（需要在#production中）
 spring.datasource.testWhileIdle = true 
 spring .datasource.validationQuery = SELECT 1 

＃显示或不记录每个sql查询
 spring.jpa.show-sql = true 

＃Hibernate ddl auto（创建，删除，更新）
 spring.jpa.hibernate.ddl-auto =更新
 server.tomcat.uri-encoding = UTF-8 

＃HTTP编码HttpEncodingProperties）
 spring.http.encoding.charset = UTF-8 
 spring.http.encoding.enabled = true 
 spring.http.encoding.force = true 

＃命名策略
 spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy 

＃使用sp ring.jpa.properties。*用于Hibernate本地属性（#prefix是在将
＃添加到实体管理器之前剥离的）

＃SQL方言使得Hibernate为选定的对象生成更好的SQL #database 
 spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect 
 spring.jpa.properties.hibernate.connection.characterEncoding = utf-8 
 spring.jpa。 properties.hibernate.connection.CharSet = utf-8 
 spring.jpa.properties.hibernate.connection.useUnicode = true 

 server.port = 8080 
 

everyone, my app based on Spring MVC and i was trying to persist Arabic text in MySQL (i use JPA) but it's save ???? instead of Arabic characters. I tried to use this:

spring.datasource.url=jdbc:mysql://localhost/test?useUnicode=true&characterEncoding=UTF-8&characterSetResults=UTF-8

but i got error when i tried to save text in Ar***:

java.sql.SQLException: Incorrect string value: '\xD8\xAA\xD8\xB1\xD8\xAD...' for column 'last_name' at row 1

Thanks in advance.

Hi after a bit of search in the internet I added a couple of lines to my application.properties in order to use UTF-8 encoding and it finally worked. here is the file. don't forget to change the url and password etc.

   # DataSource settings: set here your own configurations for the   
# #database 
    # connection. In this example we have "netgloo_blog" as database name #and 
    # "root" as username and password.
    spring.datasource.url = jdbc:mysql://localhost:3306/newDB?useUnicode=yes&characterEncoding=UTF-8&characterSetResults=UTF-8
    spring.datasource.username = root
    spring.datasource.password = somePassword

    # Keep the connection alive if idle for a long time (needed in #production)
    spring.datasource.testWhileIdle = true
    spring.datasource.validationQuery = SELECT 1

    # Show or not log for each sql query
    spring.jpa.show-sql = true

    # Hibernate ddl auto (create, create-drop, update)
    spring.jpa.hibernate.ddl-auto = update
    server.tomcat.uri-encoding=UTF-8

    # HTTP encoding (HttpEncodingProperties)
    spring.http.encoding.charset=UTF-8
    spring.http.encoding.enabled=true
    spring.http.encoding.force=true

    # Naming strategy
    spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy

    # Use spring.jpa.properties.* for Hibernate native properties (the #prefix is
    # stripped before adding them to the entity manager)

    # The SQL dialect makes Hibernate generate better SQL for the chosen #database
    spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
    spring.jpa.properties.hibernate.connection.characterEncoding=utf-8
    spring.jpa.properties.hibernate.connection.CharSet=utf-8
    spring.jpa.properties.hibernate.connection.useUnicode=true

    server.port=8080