JAVA工具类集锦3--编码过滤器_util包编码的过滤器-优快云博客

本文链接：https://blog.youkuaiyun.com/anysky130/article/details/2407108

本文介绍了一个简单的字符编码Filter实现方式，该Filter可以根据配置选择字符编码，并应用于ServletRequest对象中，确保了后续处理过程中数据的正确解析。

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3、编码过滤器

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

/**
* 字符编码filter
*/
public class EncodingFilter extends HttpServlet implements Filter{
    private FilterConfig filterConfig;
    private String encoding = null;
    protected boolean ignore = true;

    public void init(FilterConfig filterConfig) throws ServletException{
        this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
        String value = filterConfig.getInitParameter("ignore");
        if (value == null){
            this.ignore = true;
        } else if (value.equalsIgnoreCase("true")) {
            this.ignore = true;
        } else if (value.equalsIgnoreCase("yes")) {
            this.ignore = true;
        } else {
            this.ignore = false;
        }
    }

    //Process the request/response pair
    public void doFilter(ServletRequest request,ServletResponse response,
                         FilterChain filterChain){
        try{
            if (ignore || (request.getCharacterEncoding() == null)) {
                 String encoding = selectEncoding(request);
                 if (encoding != null)
                     request.setCharacterEncoding(encoding);
             }
            filterChain.doFilter(request,response);
        } catch(Exception sx){
            sx.getMessage();
        }

}

    private String selectEncoding(ServletRequest request) {
        return (this.encoding);
    }

    //Clean up resources
    public void destroy(){
        encoding = null;
        filterConfig = null;
    }
}