采用过滤器解决中文乱码问题

最新推荐文章于 2020-04-22 18:14:34 发布

原创最新推荐文章于 2020-04-22 18:14:34 发布 · 158 阅读

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文章标签：

#Servlet #Web #XML

本文介绍了如何在web应用中使用CharacterEncodingFilter类实现请求和响应的字符编码转换，通过配置init-param参数来指定编码类型，并在doFilter方法中根据配置启用或禁用编码转换。

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 FilterConfig config;
    private String encoding;
    private boolean enable;

    public void destroy() {

    }

    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain filterChain) throws IOException, ServletException {

        if(this.enable){
            request.setCharacterEncoding(encoding);
            response.setCharacterEncoding(encoding);
        }

        filterChain.doFilter(request, response);


    }

    public void init (FilterConfig config ) throws ServletException {
        this.config = config;
        loadConfigParams();


    }

    private void loadConfigParams() {
        this.encoding= this.config.getInitParameter("enconding");
        String flag = this.config.getInitParameter("enable");
        if(flag.equalsIgnoreCase("true")){
            this.enable = true;
        }else{
            this.enable = false;
        }


    }

}

web.xml

<filter>
    <filter-name>encondingFilter</filter-name>
    <filter-class>com.morning.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>enconding</param-name>
        <param-value>utf-8</param-value>
    </init-param>
    <init-param>
        <param-name>enable</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>

<filter-mapping>
<filter-name>encondingFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>