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: 
 * <filter> 
 * <filter-name>login</filter-name>
 * <filter-class>
 * org.waityou.news.util.filters.LoginFilter
 * </filter-class>
 * </filter> 
 * <filter-mapping> 
 * <filter-name>login</filter-name>
 * <url-pattern>/manager/*</url-pattern> 
 * </filter-mapping>
 
*/

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: 
 * <filter>
 * <filter-name>Set Character Encoding</filter-name>
 * <filter-class>
 * org.waityou.news.util.filters.SetCharacterEncodingFilter
 * </filter-class> 
 * </filter> 
 * <filter-mapping>
 * <filter-name>Set Character Encoding</filter-name> 
 * <url-pattern>/*</url-pattern>
 * </filter-mapping>
 
*/

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 {}

}