How to Resolve Character Encoding Issues in Spring MVC Using UTF-8?

Spring MVC UTF-8 Encoding: Resolving Character Encoding Issues

Introduction

When working with Spring MVC, character encoding plays a crucial role in displaying special characters correctly on JSP pages. This article addresses the issue of encoding errors and provides a solution to ensure proper UTF-8 character rendering.

Problem Statement

A user encountered encoding problems when displaying UTF-8 characters on JSP pages. The issue persisted despite setting the default encoding to UTF-8 in SpringSource Tool Suite.

Solution

Upon further investigation, it was determined that registering Spring's CharacterEncodingFilter in web.xml could resolve the issue. Here's the filter configuration:

<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>

Tomcat Configuration

If using Tomcat, the URIEncoding parameter in server.xml must be set to UTF-8 for proper character encoding.

Checklist for UTF-8 Encoding in Spring MVC

To ensure proper UTF-8 encoding, follow this checklist:

1. Register the CharacterEncodingFilter in web.xml as shown above.
2. Set URIEncoding to UTF-8 in server.xml if using Tomcat.

3. Ensure that your JSP pages have the following directives:

   • <%@ page language="java" pageEncoding="UTF-8"%>
   • <%@ page contentType="text/html;charset=UTF-8" %>
4. Make sure your source files are saved in UTF-8 encoding. In Eclipse, you can set this in Preferences > General > Workspace.

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