编码 filter

package com.hongyou.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 HyCharEncodingFilter implements Filter
{
	private String charSet;

	public void init(FilterConfig filterConfig) throws ServletException {
		charSet = filterConfig.getInitParameter("charSet");
		if(charSet == null || charSet.length() < 1){
			charSet = "UTF-8";
		}
		System.out.println("CharEncodingFilter--字符集: " + this.getCharSet());
	}

	public void destroy() {
		this.setCharSet(null);
	}

	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		req.setCharacterEncoding(this.getCharSet());
		chain.doFilter(req, res);
	}


	public String getCharSet() {
		return charSet;
	}

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

web.xml

<filter>
		<filter-name>CharEncodingFilter</filter-name>
		<filter-class>com.hongyou.filter.HyCharEncodingFilter</filter-class>
		<init-param>
			<param-name>charSet</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	
	<filter-mapping>
		<filter-name>CharEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>