com.jsj.filter====新闻发布系统（7）

2020-05-15

这个是拦截器，可以看做保安

com.jsj.filter

AdminFilter

package com.jsj.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 管理员认证拦截
 */
@WebFilter(urlPatterns = "/admin/manage/*")
public class AdminFilter implements Filter {

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        if (request.getSession().getAttribute("adminStatus")!=null&& (boolean) request.getSession().getAttribute("adminStatus"))
            filterChain.doFilter(servletRequest, servletResponse);
        else {
            response.setContentType("text/html;charset=UTF-8");
            response.getWriter().println("您不是管理员，无权访问该资源！请进行<a href='/admin'>管理员登录</a>");
        }
    }

}

CharterEncodingFilter

package com.jsj.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * 请求编码过滤器
 */
@WebFilter(urlPatterns = "/*",initParams = { @WebInitParam(name = "CharacterEncoding", value = "UTF-8")})
public class CharacterEncodingFilter implements Filter {

    private String characterEncoding;

    @Override
    public void init(FilterConfig filterConfig) {
        this.characterEncoding = filterConfig.getInitParameter("CharacterEncoding");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        request.setCharacterEncoding(characterEncoding);
        filterChain.doFilter(request,servletResponse);
    }
}