J2EE工具类：CookieUtil.java

package com.worthtech.app.util;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CookieUtil {

	private HttpServletRequest request;
	private HttpServletResponse response;
	private int age;//设置cookie经过多长秒后被删除
	public CookieUtil(HttpServletRequest request,
			HttpServletResponse response,int age) {
		this.request = request;
		this.response = response;
		this.age=age;
	}
	
	public void addCookie(String name, String value) {
		Cookie cookies = new Cookie(name, value);
		cookies.setPath("/");
//		cookies.setMaxAge(-1);//设置cookie经过多长秒后被删除。如果0，就说明立即删除。如果是负数就表明当浏览器关闭时自动删除。
		cookies.setMaxAge(age);
		response.addCookie(cookies);
	}
	public String getCookieValue(String cookieName) {
		if (cookieName != null) {
        	Cookie cookie = getCookie(cookieName);
        	if(cookie!=null){
        		return cookie.getValue();
        	}
        }
		return "";
	}
	
	public Cookie getCookie(String cookieName){
		Cookie[] cookies = request.getCookies();
		Cookie cookie = null;
		try {
			if (cookies != null && cookies.length > 0) {
				for (int i = 0; i < cookies.length; i++) {
					cookie = cookies[i];
					if (cookie.getName().equals(cookieName)) {
						return cookie;
					}
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return cookie;
	}
	
	public boolean deleteCookie(String cookieName) {
        if (cookieName != null) {
        	Cookie cookie = getCookie(cookieName);
        	if(cookie!=null){
        		cookie.setMaxAge(0);//如果0，就说明立即删除
                cookie.setPath("/");//不要漏掉
        		response.addCookie(cookie);
        		return true;
        	}
        }
        return false;
    }
	public static void main(String[] args){
//		CookieUtil util=new CookieUtil(request,response,-1);
//		util.addCookie("name","value");
//		String value=util.getCookieValue("name");
//		System.out.println("value="+value);
	}
}

评论

4 楼 moxia 2013-05-27  

jbas 写道

    public Cookie getCookie(String cookieName){  
        Cookie[] cookies = request.getCookies();  
        Cookie cookie = null;  
        try {  
            if (cookies != null && cookies.length > 0) {  
                for (int i = 0; i < cookies.length; i++) {  
                    cookie = cookies[i];  
                    if (cookie.getName().equals(cookieName)) {  
                        return cookie;  
                    }  
                }  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return cookie;  
    }  


这个有问题，改了下：

    public Cookie getCookie(String cookieName){  
        Cookie[] cookies = request.getCookies();  
        Cookie cookie = null;  
        try {  
            if (cookies != null && cookies.length > 0) {  
                for (int i = 0; i < cookies.length; i++) {  
                    cookie = cookies[i];  
                    if (cookie.getName().equals(cookieName)) {  
                        return cookie;  
                    }  
                }  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return null;   //修改处  
    }  

没必要修改

3 楼 330821256 2013-05-08  

谢谢了，学习下！

2 楼 gundumw100 2009-11-27  

thank 有

1 楼 jbas 2009-11-27  

    public Cookie getCookie(String cookieName){  
        Cookie[] cookies = request.getCookies();  
        Cookie cookie = null;  
        try {  
            if (cookies != null && cookies.length > 0) {  
                for (int i = 0; i < cookies.length; i++) {  
                    cookie = cookies[i];  
                    if (cookie.getName().equals(cookieName)) {  
                        return cookie;  
                    }  
                }  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return cookie;  
    }  


这个有问题，改了下：

    public Cookie getCookie(String cookieName){  
        Cookie[] cookies = request.getCookies();  
        Cookie cookie = null;  
        try {  
            if (cookies != null && cookies.length > 0) {  
                for (int i = 0; i < cookies.length; i++) {  
                    cookie = cookies[i];  
                    if (cookie.getName().equals(cookieName)) {  
                        return cookie;  
                    }  
                }  
            }  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return null;   //修改处  
    }