Frequently Asked Questions and Solutions: Solving Tomcat Chinese Garbled Problems

Common problems and solutions to Chinese garbled characters in Tomcat

Introduction
As a commonly used Java Web server, Tomcat is often used to develop and deploy Web applications. However, due to various reasons, Tomcat sometimes encounters garbled Chinese characters, causing abnormalities in page display and data transmission. This article will introduce some common Chinese garbled code problems, and provide solutions and specific code examples to help developers solve the Chinese garbled code problem in Tomcat.

1. The problem and solution of Chinese garbled characters in the URL

1. Problem description
   When parameters containing Chinese characters are passed in the URL, Tomcat will convert the Chinese characters by default Encoding to ensure transmission security. However, sometimes we want to display Chinese characters directly in the URL, but Tomcat will convert them into garbled form.
2. Solution
   This problem can be solved by modifying the configuration of the encoding filter in the web.xml file. Add the following configuration 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>

In this way, Tomcat will process the Chinese characters in the URL as UTF-8 to avoid garbled characters.

2. The problem and solution of Chinese garbled characters in request parameters

1. Problem description
   When the application receives a request parameter from the user that contains Chinese characters, if it is not correct processing will cause garbled code problems. For example, when processing GET requests, Tomcat decodes in ISO-8859-1 by default instead of UTF-8.
2. Solution
   This problem can be solved by adding the URIEncoding parameter in Tomcat's server.xml file. Find and modify the following configuration:

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

In this way, Tomcat will process the request parameters in UTF-8 encoding to avoid Chinese garbled characters.

3. The problem and solution of Chinese garbled characters in the response page

1. Problem description
   When the page returned by the application contains Chinese characters, if the correct encoding is not performed , will cause the page to display garbled characters.
2. Solution
   In the JSP page or Servlet, you need to explicitly specify the character encoding of the page as UTF-8. You can set the encoding by adding the following code to the JSP page:

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

Alternatively, add the following code to the Servlet to set the encoding:

response.setContentType("text/html;charset=UTF-8");

In this way, Tomcat will return the page when Use UTF-8 for encoding to ensure that Chinese characters are displayed normally on the page.

Summary
Tomcat Chinese garbled problem is one of the common problems in web development. This article provides solutions to the problem of Chinese garbled characters in URLs, request parameters, and response pages in Tomcat, and gives specific code examples. By adjusting Tomcat-related configuration and encoding processing, the problem of Chinese garbled characters can be well solved and the normal operation of web applications can be ensured. I hope this article can help readers better understand and solve the problem of Chinese garbled characters in Tomcat.

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