Solving the problem of Chinese garbled characters: Suggestions for optimizing Tomcat configuration

Optimize Tomcat configuration to solve the problem of Chinese garbled characters

Abstract: Chinese garbled characters are a problem often encountered when developing and deploying web applications. This article will This article introduces how to solve the problem of Chinese garbled characters by optimizing Tomcat configuration, and provides specific code examples.

Introduction:
In modern web applications, the use of Chinese characters is very common. However, due to different encoding methods and default configuration issues, these Chinese characters sometimes appear garbled. For developers who use Tomcat as a web server, it is very important to solve the problem of Chinese garbled characters. The following will introduce how to solve this problem by optimizing Tomcat configuration.

Step 1: Set the URIEncoding parameter
In Tomcat’s configuration file server.xml, find the node and add the URIEncoding="UTF-8" parameter. This parameter specifies the encoding method of the request URI as UTF-8, ensuring that Tomcat can correctly parse the request URI with Chinese characters. The sample code is as follows:

<Connector port="8080" protocol="HTTP/1.1" 
           connectionTimeout="20000" 
           redirectPort="8443" 
           URIEncoding="UTF-8" />

Step 2: Set the default encoding method
Tomcat uses the ISO-8859-1 encoding method by default to process the parameters of the POST request. In order to solve the Chinese garbled problem, we need to set the default encoding method to UTF-8. In Tomcat's configuration file web.xml, find the node, and add the characterEncodingFilter parameter and characterEncoding parameter. The sample code is as follows:

<filter>
  <filter-name>SetCharacterEncodingFilter</filter-name>
  <filter-class>org.apache.catalina.filters.SetCharacterEncodingFilter</filter-class>
  <init-param>
    <param-name>encoding</param-name>
    <param-value>UTF-8</param-value>
  </init-param>
  <init-param>
    <param-name>ignore</param-name>
    <param-value>true</param-value>
  </init-param>
</filter>

<filter-mapping>
  <filter-name>SetCharacterEncodingFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

Step 3: Set the encoding method in the response header
In order to ensure that Tomcat correctly responds to requests containing Chinese characters, we need to set the correct encoding method in the response header. In the Servlet code, this can be achieved by setting response.setCharacterEncoding("UTF-8"). The sample code is as follows:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setCharacterEncoding("UTF-8");
    // 其他代码
}

Summary:
Through the above steps of optimizing Tomcat configuration, we can easily solve the problem of Chinese garbled characters. It is important to remember that when processing Chinese characters, UTF-8 encoding is used uniformly and the corresponding settings are made in the Tomcat configuration file. In this way, our web application can correctly handle and display Chinese characters.

Reference:

1. Tomcat Configuration Reference - https://tomcat.apache.org/tomcat-9.0-doc/config/
2. Servlet API - http ://download.oracle.com/javaee/6/api/javax/servlet/http/HttpServletResponse.html

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