A simple java character set filter implementation

Time:2021-9-16

Copy codeThe code is as follows:
package dw05prj.util.filter;

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

/*Page character set filter stream*/

/*
Examples of configuration in web.xml
<filter>
<filter-name>CharEncodingFilter</filter-name>
<filter-class>dw05prj.util.filter.CharEncodingFilter</filter-class>
<init-param>
<param-name>charset</param-name>
<param-value>GBK</param-value>
</init-param>

</filter>
<filter-mapping>
<filter-name>CharEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
*/

public class CharEncodingFilter implements Filter {

private String charSet ;

public void init(FilterConfig parm1) throws ServletException {
charSet = parm1.getInitParameter(“charset”) ;
if (charSet == null && charSet.length() < 1)
{
charSet = “UTF-8” ;
}
System. Out. Println (“charencodingfilter — character set:” + this. Getcharset());
}

public void doFilter(ServletRequest parm1, ServletResponse parm2,
FilterChain parm3) throws IOException, ServletException {

//Set character set
parm1.setCharacterEncoding(this.getCharSet());
parm3.doFilter(parm1, parm2);
//Every request to the server in the page is filtered — such as images, JS, HTML / JSP, and so on
//System.out.println (“—CharEncodingFilter: ” + this.getCharSet()) ;
}

public void destroy() {
// TODO: Add your code here
this.setCharSet(null) ;
}

public void setCharSet(String charSet) {
this.charSet = charSet;
}

public String getCharSet() {
return (this.charSet);
}
}