package com.mzh.library.filter;

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;

public class CharacterEncodingFilter implements Filter {
    private String encoding = "UTF-8";

    @Override
    public void init(FilterConfig filterConfig) {
        String configuredEncoding = filterConfig.getInitParameter("encoding");
        if (configuredEncoding != null && !configuredEncoding.trim().isEmpty()) {
            encoding = configuredEncoding.trim();
        }
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
        throws IOException, ServletException {
        request.setCharacterEncoding(encoding);
        response.setCharacterEncoding(encoding);
        chain.doFilter(request, response);
    }
}
