Struts2 Chinese messy code solution sharing

Fit the situation -> From the JSP passed into the action of the garbled code, here to GBK as an example

1. Create a filter for conversion coding
File location, for example: the SRC. Util. SetCharacterEncodingFilter. Java

package util;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.UnavailableException;

public class SetCharacterEncodingFilter implements Filter {
    
    public void destroy() {
    }
    
    public void doFilter(ServletRequest request, ServletResponse response,
    FilterChain chain)throws IOException, ServletException {
    request.setCharacterEncoding("gbk");
    //Pass control to the next filter
    chain.doFilter(request, response);
    }
    public void init(FilterConfig filterConfig) throws ServletException {
    }
}

2. Modify web.xml to add 2 filters before the struts FilterDispatcher mapping

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
 xmlns="http://java.sun.com/xml/ns/javaee" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
    <filter>
  <filter-name>Set Character Encoding</filter-name> 
  <filter-class>util.SetCharacterEncodingFilter</filter-class> 
 </filter> 
 <filter-mapping> 
     <filter-name>Set Character Encoding</filter-name>
     <url-pattern>/*</url-pattern> 
 </filter-mapping>

    <filter> 
        <filter-name>struts-cleanup</filter-name> 
        <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class> 
    </filter>
    <filter-mapping>
        <filter-name>struts-cleanup</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    

    
 <filter>
  <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
 </filter>
  <filter-mapping>
  <filter-name>struts2</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
</web-app>

3. Your JSP header should have
< % @ page language = "Java" pageEncoding = "GBK" % >

4. Modify the default encoding Settings in struts.xml

<struts>
 <constant name="struts.i18n.encoding" value="gbk"></constant>
...
...
...
</struts>

Basically this can solve the problem of most incoming characters

PS: if it is a database extraction character chaos, such as mysql, confirm that your database character is GBK, and the connection string specified the character encoding
< The property name = "url" value = "JDBC: mysql: / / localhost/database? UseUnicode = true& CharacterEncoding = GBK "> < / property>