A practical manual to effectively solve the problem of garbled characters in Tomcat

A practical guide to solving Tomcat garbled characters

Introduction:
In web development, we often encounter the problem of Tomcat garbled characters. Garbled characters may cause users to be unable to display or process data correctly, causing inconvenience to the user experience. Therefore, solving the Tomcat garbled problem is a very important step. This article will provide you with some practical guidelines to solve Tomcat garbled code, and attach specific code examples to help you easily deal with this problem.

1. Understand the causes of Tomcat garbled characters
The main cause of Tomcat garbled characters is that the encoding and decoding of characters do not match. The following are several common situations that may cause Tomcat garbled characters:

1. The page encoding is inconsistent with the request encoding.
2. The default encoding of the server is inconsistent with the page encoding.
3. The character encoding stored in the database is inconsistent with the page encoding.

2. Solution
In order to solve the Tomcat garbled problem, we can adopt the following solutions.

1. Set Tomcat's character encoding
   First, we can set the server's default character encoding by modifying Tomcat's configuration file. Open the server.xml file in Tomcat's conf directory, find the Connector node, and add the attribute:

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

   This will set Tomcat's default character encoding to UTF-8 so that Chinese characters can be processed correctly.

2. Set the encoding of the page
   Tomcat supports setting the encoding of the page in the web.xml file. We can add the following code to the head of the web.

Set encoding in JSP page
3. We can also manually set encoding in JSP page. Add the following code to the head of the JSP page:

   <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>
     <init-param>
    <param-name>forceEncoding</param-name>
    <param-value>true</param-value>
     </init-param>
   </filter>
   <filter-mapping>
     <filter-name>encodingFilter</filter-name>
     <url-pattern>/*</url-pattern>
   </filter-mapping>

   
   In this way, the encoding of the JSP page will be set to UTF-8.

Dealing with database garbled characters
4. If our data is stored in a relational database, then we also need to deal with the problem of garbled characters in the database. Before connecting to the database, we can specify the character encoding by setting the parameters of the connection string. For example, for a MySQL database, the connection string can be set as follows:

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

   
   In this way, our database connection will use UTF-8 encoding to handle Chinese characters.

3. Code Example

The following is a simple example code that demonstrates how to deal with Tomcat garbled characters in Servlet:

jdbc:mysql://localhost:3306/db_name?useUnicode=true&characterEncoding=UTF-8

4. Summary## The #Tomcat garbled problem may cause certain troubles to web development, but as long as we follow some basic principles and adopt appropriate solutions, we can easily deal with this problem. This article provides some practical guides and code examples, hoping to help you solve Tomcat garbled problems.

The article is over, I wish you good luck in your web development work!

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