Java web整站中文过滤器实现

[java]代码库

package cn.edu.itcast.filter;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

// 解决全站中文乱码的问题
public class AllCharacterFilter implements Filter{

	private FilterConfig filterConfig ;
	
	@Override
	public void init(FilterConfig arg0) throws ServletException {
		
		this.filterConfig = arg0 ;
	}
	@Override
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
		
		System.out.println("整站中文过滤器开始............");
		HttpServletRequest request = (HttpServletRequest)req ;
		HttpServletResponse response = (HttpServletResponse)res ;
		String encoding = filterConfig.getInitParameter("encoding"); 
		if(encoding == null){
			encoding = "UTF-8" ;
		}
		// 默认只能解决POST方式的中文乱码问题
		request.setCharacterEncoding(encoding) ;
		response.setCharacterEncoding(encoding) ;
		response.setContentType("text/html;charset="+encoding) ;
		MyHttpServletRequest myRequest = new MyHttpServletRequest(request); 		
		chain.doFilter(myRequest, response) ;
		System.out.println("整站中文过滤器结束............");
	}
	@Override
	public void destroy() {
		
		
	}
	

}
// 包装设计模式修改GET请求处理方式
class MyHttpServletRequest extends HttpServletRequestWrapper
{

	public MyHttpServletRequest(HttpServletRequest request)
	{
		super(request);		
	}

	@Override
	public String getParameter(String name)
	{
		
		String value = super.getParameter(name) ;
		if(value != null)
		{		
			String method = super.getMethod() ;
			if("get".equalsIgnoreCase(method))
			{				
				try 
				{
					value = new String (value.getBytes("ISO-8859-1"),super.getCharacterEncoding()) ;
					
				} catch (UnsupportedEncodingException e)
				{					
					e.printStackTrace();
				}
			}
		}
		return value ;
	}	
}