字符编码过滤器

将编码设置成GBK

package com.student.comm;

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 SetCharacterEncodingFilter implements Filter {

	protected String encoding;
    protected FilterConfig filterConfig;
    protected boolean ignore;

    public SetCharacterEncodingFilter() {
        encoding = null;
        filterConfig = null;
        ignore = true;
    }

    public void destroy() {
        encoding = null;
        filterConfig = null;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        if (ignore || request.getCharacterEncoding() == null) {
            String encoding = selectEncoding(request);
            if (encoding != null) {
                request.setCharacterEncoding(encoding);
            } else {
               request.setCharacterEncoding("gbk");
            }
        }
        chain.doFilter(request, response);
    }
    
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
        encoding = filterConfig.getInitParameter("encoding");
        String value = filterConfig.getInitParameter("ignore");
        if (value == null) {
            ignore = true;
        } else
        if (value.equalsIgnoreCase("true")) {
            ignore = true;
        } else
        if (value.equalsIgnoreCase("yes")) {
            ignore = true;
        } else {
            ignore = false;
        }
    }

    protected String selectEncoding(ServletRequest request) {
        return encoding;
    }
}

web.xml配置

  <!-- =========================================== -->
	<!-- ============ 过滤器映射 ============== -->
	<!-- =========================================== -->
	<!-- 字符编码过滤器映射 -->
  <filter>
		<filter-name>SetCharacterEncodingFilter</filter-name>
		<filter-class>
			com.student.comm.SetCharacterEncodingFilter
		</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>GBK</param-value>
		</init-param>
		<init-param>
			<param-name>ignore</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	
	<filter-mapping>
		<filter-name>SetCharacterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

评论

1 楼 e437032193 2012-03-06  

这位仁兄可否解释一下你的每一行代码，小弟初学有些看不懂。谢谢