How to correctly handle character encoding issues in Tomcat

How to correctly handle the garbled code problem in Tomcat requires specific code examples

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In Web development, the garbled code problem has always been a problem A headache for people. Especially when using Tomcat as a web server, it is even more important to correctly handle garbled characters. This article will introduce how to correctly handle garbled characters in Tomcat and give corresponding code examples.

First of all, we need to clarify the cause of the garbled code problem. Garbled characters are usually caused by inconsistent character encoding. For example, when a browser sends a form submission request, the data is transmitted through multiple links such as the browser, server, and database. The character encoding used in each link may be different, causing garbled characters. Therefore, we need to correctly set the character encoding at every link to ensure the correct transmission of data.

1. Set Tomcat's default character encoding
   The first step is to set Tomcat's default character encoding. Find the conf/server.xml file in the Tomcat installation directory and find the following code segment in it:

       connectionTimeout="20000"
       redirectPort="8443" />

Add the URIEncoding="UTF-8" attribute to this code snippet to set Tomcat's default character encoding to UTF-8:

       connectionTimeout="20000"
       redirectPort="8443" URIEncoding="UTF-8" />

2. Set the character encoding of the Web application
   The second step is to set the character encoding of the Web application. Find the web.xml file of the web application and find the following code segment in it:

     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
             http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
     version="4.0">

Add the following code in this code snippet to set the character encoding of the web application to UTF-8:

encodingFilter
org.springframework.web.filter.CharacterEncodingFilter

<param-name>encoding</param-name>
<param-value>UTF-8</param-value>

param>

<param-name>forceEncoding</param-name>
<param-value>true</param-value>

encodingFilter
/*

3. Set database Character encoding
   If the web application interacts with the database, we also need to set the character encoding of the database. Taking MySQL as an example, you can specify the character encoding to be UTF-8 when connecting to the database. The sample code is as follows:

String url = "jdbc:mysql://localhost:3306/mydatabase?useUnicode=true&characterEncoding=UTF-8";
Connection conn = DriverManager.getConnection(url, username, password);

In this way, you can ensure that the data is stored and read in the database using UTF-8 character encoding.

4. Set the character encoding in the JSP page
   Finally, we also need to set the character encoding in the JSP page. You can add the following code to the head of the JSP page to set the character encoding of the current page to UTF-8:

So far, we have completed the settings to correctly handle the garbled problem in Tomcat. By setting the default character encoding of Tomcat, the character encoding of the web application, the character encoding of the database, and setting the character encoding in the JSP page, you can ensure that the data uses UTF-8 character encoding throughout the entire process, effectively solving the problem of garbled characters.

Summary:

In Web development, it is very important to correctly handle the problem of garbled characters. This article introduces how to correctly handle garbled characters in Tomcat and gives corresponding code examples. By setting the default character encoding of Tomcat, the character encoding of the web application, the character encoding of the database, and setting the character encoding in the JSP page, we can ensure that the data uses UTF-8 character encoding throughout the entire process, effectively solving the problem of garbled characters. I hope this article will be helpful to friends who solve the problem of garbled characters.

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