过滤器

最新推荐文章于 2025-01-19 19:39:55 发布

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本文介绍了一个Java Web项目的过滤器配置与实现细节，包括编码设置、Hibernate Session管理及公司会员登录验证等功能。通过web.xml文件定义了过滤器的执行顺序，并详细展示了各个过滤器的Java代码。

过滤器的顺序由web.xml中的filter-mapping的顺序决定，改项目中过滤器的顺序是

EncodingSet->SessionDeal->ComCheck||SeekerCheck

编码过滤器

package com.lo4.ijob.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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class EncodingSet implements Filter{

	String encoding=null;
	public void destroy() {
		
	}

	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) arg0;
		HttpServletResponse response=(HttpServletResponse) arg1;
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		arg2.doFilter(request, arg1);
	}

	public void init(FilterConfig arg0) throws ServletException {
		encoding =arg0.getInitParameter("encoding");
		if(encoding==null){
			encoding="utf-8";
		}
	}

}

	<filter>
		<filter-name>EncodingSet</filter-name>
		<filter-class>com.lo4.ijob.filter.EncodingSet</filter-class>
		<init-param>
			<param-name>encoding</param-name><!--初始化默认编码-->
			<param-value>utf-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>EncodingSet</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

Hibernate持久化session的边界

package com.lo4.ijob.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;

import org.hibernate.Session;
import org.hibernate.Transaction;

import com.lo4.ijob.util.MySessionFactory;

public class SessionDeal implements Filter {

	public void destroy() {
	}

	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		Session session = MySessionFactory.getInstence().getSession();
		Transaction t = session.beginTransaction();
		try {
			arg2.doFilter(arg0, arg1);
			t.commit();
		} catch (Exception e) {
			e.printStackTrace();
			t.rollback();
		} finally{
			session.close();	
		}
	}

	public void init(FilterConfig arg0) throws ServletException {
	}

}

	<filter>
		<filter-name>SessionDeal</filter-name>
		<filter-class>com.lo4.ijob.filter.SessionDeal</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>SessionDeal</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

公司会员的登录限制

package com.lo4.ijob.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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.lo4.ijob.entity.Company;

public class ComCheck implements Filter{

	public void destroy() {		
	}

	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		HttpServletRequest request=(HttpServletRequest) arg0;
		HttpServletResponse response=(HttpServletResponse)arg1;
		HttpSession session=request.getSession();
		Company users=(Company)session.getAttribute("com");
		if(users==null){
			response.sendRedirect("../company_login.jsp");
		}else{
			arg2.doFilter(request, response);
		}
	}

	public void init(FilterConfig arg0) throws ServletException {		
	}

}

	<filter>
		<filter-name>ComCheck</filter-name>
		<filter-class>com.lo4.ijob.filter.ComCheck</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>ComCheck</filter-name>
		<url-pattern>/company/*</url-pattern>
	</filter-mapping>