cookie實現登陸頁面保存用戶名

1.首先是用戶名，密碼的input 和保存狀態的checkbox

<input class="ipt" type="text" name='username' value='${name}'/>
<input class="ipt" type='password' name='password' id='password' />
<input style=" margin-left:60px; margin-right:10px; " type="checkbox" name="rememberMe" id="rememberMe" />

 

沒找到怎么保存checkbox的狀態，我就自己寫了個

 

<script>
    window.onload = function() {
        if ('${name}' != '') {
            document.getElementById('rememberMe').checked = true;
        } else {
            document.getElementById('rememberMe').checked = false;
        }
    }
</script>

 

2.然后在jsp頂部加入java代碼，用於讀取cookie

<%
    String name = "";
    String psw = "";
    String checked = "";
    Cookie[] cookies = request.getCookies();
    if(cookies != null && cookies.length>0){
        for(int i =0; i<cookies.length; i++){
            if(cookies[i].getName().equals("name")){
                name=cookies[i].getValue();
                request.setAttribute("name",name);
            }

            if(cookies[i].getName().equals("psw")){
                psw=cookies[i].getValue();
                request.setAttribute("psw",psw);
            }
        }
    }
%>

 

3.其次，在登陸到后台驗證完畢密碼后面加入

//處理Cookie
addCookie(username , pwd ,response ,request);

下面是addCookie這個方法

 

/**Cookie的實現
     * @throws UnsupportedEncodingException **/
    private void addCookie(String name, String password,HttpServletResponse response, HttpServletRequest request) throws UnsupportedEncodingException  {
        if(StringUtils.isNotBlank(name)&&StringUtils.isNotBlank(password)){
            //創建Cookie
//          Cookie nameCookie=new Cookie("name",URLEncoder.encode(name,"utf-8"));
            Cookie nameCookie=new Cookie("name",name);
            Cookie pswCookie=new Cookie("psw",password);

            //設置Cookie的父路徑
            nameCookie.setPath(request.getContextPath()+"/");
            pswCookie.setPath(request.getContextPath()+"/");

            //獲取是否保存Cookie
            String rememberMe=request.getParameter("rememberMe");
            if(rememberMe==null){//不保存Cookie
                nameCookie.setMaxAge(0);
                pswCookie.setMaxAge(0);
            }else{//保存Cookie的時間長度，單位為秒
                nameCookie.setMaxAge(7*24*60*60);
                pswCookie.setMaxAge(7*24*60*60);
            }
            //加入Cookie到響應頭
            response.addCookie(nameCookie);
            response.addCookie(pswCookie);
        }
    }
}   1.首先是用戶名，密碼的input 和保存狀態的checkbox 
           <input class="ipt" type="text" name='username' value='${name}'/>
<input class="ipt" type='password' name='password' id='password' />
<input style=" margin-left:60px; margin-right:10px; " type="checkbox" name="rememberMe" id="rememberMe" />   沒找到怎么保存checkbox的狀態，我就自己寫了個   
           <script>
    window.onload = function() {
        if ('${name}' != '') {
            document.getElementById('rememberMe').checked = true;
        } else {
            document.getElementById('rememberMe').checked = false;
        }
    }
</script>   2.然后在jsp頂部加入java代碼，用於讀取cookie 
           <%
    String name = "";
    String psw = "";
    String checked = "";
    Cookie[] cookies = request.getCookies();
    if(cookies != null && cookies.length>0){
        for(int i =0; i<cookies.length; i++){
            if(cookies[i].getName().equals("name")){
                name=cookies[i].getValue();
                request.setAttribute("name",name);
            }

            if(cookies[i].getName().equals("psw")){
                psw=cookies[i].getValue();
                request.setAttribute("psw",psw);
            }
        }
    }
%>   3.其次，在登陸到后台驗證完畢密碼后面加入 
           //處理Cookie
addCookie(username , pwd ,response ,request); 下面是addCookie這個方法   
           /**Cookie的實現
     * @throws UnsupportedEncodingException **/
    private void addCookie(String name, String password,HttpServletResponse response, HttpServletRequest request) throws UnsupportedEncodingException  {
        if(StringUtils.isNotBlank(name)&&StringUtils.isNotBlank(password)){
            //創建Cookie
//          Cookie nameCookie=new Cookie("name",URLEncoder.encode(name,"utf-8"));
            Cookie nameCookie=new Cookie("name",name);
            Cookie pswCookie=new Cookie("psw",password);

            //設置Cookie的父路徑
            nameCookie.setPath(request.getContextPath()+"/");
            pswCookie.setPath(request.getContextPath()+"/");

            //獲取是否保存Cookie
            String rememberMe=request.getParameter("rememberMe");
            if(rememberMe==null){//不保存Cookie
                nameCookie.setMaxAge(0);
                pswCookie.setMaxAge(0);
            }else{//保存Cookie的時間長度，單位為秒
                nameCookie.setMaxAge(7*24*60*60);
                pswCookie.setMaxAge(7*24*60*60);
            }
            //加入Cookie到響應頭
            response.addCookie(nameCookie);
            response.addCookie(pswCookie);
        }
    }
}
這是我借鑒CSDN一位前輩的