两个Filter类：登录过滤和编码过滤

gongtao200118

LoginFilter.java:
import javax.servlet.FilterChain;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.servlet.FilterConfig;
/**//*
*
* @author Ace
* web.xml配置如下：
*  
* login
*
* org.waityou.news.util.filters.LoginFilter
*
*  
*  
* login
* /manager/*
*
*/
public class LoginFilter implements Filter {
    protected FilterConfig filterConfig;
    public void doFilter(final ServletRequest req, final ServletResponse res,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest hreq = (HttpServletRequest) req;
        HttpServletResponse hres = (HttpServletResponse) res;
        String isLog = (String) hreq.getSession().getAttribute("isLog");
        if ((isLog != null) && ((isLog.equals("true")) || (isLog == "true")))//检查是否登录
        {
            chain.doFilter(req, res);
            return;
        } else
            hres.sendRedirect("/error.html");//如果没有登录，把视图派发到登录页面
    }
    public void destroy() {
        this.filterConfig = null;
    }
    public void init(FilterConfig config) {
        this.filterConfig = config;
    }
    public void setFilterConfig(final FilterConfig filterConfig) {
        this.filterConfig = filterConfig;
    }
}
SetCharacterEncodingFilter.java:
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;
/** *//**
* @author Ace 编码过滤，一律设置成UTF-8
*
* web.xml中配置如下：
*
* Set Character Encoding
*
* org.waityou.news.util.filters.SetCharacterEncodingFilter
*  
*  
*
* Set Character Encoding
* /*
*
*/
public class SetCharacterEncodingFilter implements Filter {
   
    public void destroy() {}
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        request.setCharacterEncoding("UTF-8");
        // 传递控制到下一个过滤器
        chain.doFilter(request, response);
    }
   
    public void init(FilterConfig filterConfig) throws ServletException {}
}


本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u/25374/showart_190550.html