How to solve the garbled characters issue when starting a project in Tomcat?

The reason for the garbled project page when starting Tomcat might be due to encoding issues or mismatched character sets. The solution is as follows:

1. Ensure that the encoding and character set settings of the project files are correct. Encoding and character set can be configured in the project’s configuration file, for example by adding the following content to the web.xml file.

<filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

This will set the encoding of all requests to UTF-8.

1. Ensure that the default encoding of the Tomcat server is set to UTF-8. This can be modified in the following configuration in the server.xml file of Tomcat.

<Connector URIEncoding="UTF-8" ...>

1. If a database is used in the project, make sure the character set of the database is properly configured. You can set the character set in the database configuration file, for example, by adding the following content to the MySQL configuration file my.cnf.

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

[mysqld]
character-set-server=utf8
collation-server=utf8_general_ci

This will set the character set of the database to UTF-8.

1. If none of the above methods have resolved the issue, try adding the following content to the header of the JSP page:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

1. If the above methods are still not effective, you can try modifying the system’s default encoding settings. Add the following content to the Tomcat startup script:

export LANG=en_US.UTF-8

Then restart Tomcat.

If none of the above methods have resolved the issue, it may be due to other reasons causing the garbled characters, you can try to check the server logs or debug the program for more information.