cookie实现登陆页面保存用户名

大家好，又见面了，我是全栈君。

1.首先是用户名，密码的input 和保存状态的checkbox

[html]
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<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” />

没找到怎么保存checkbox的状态，我就自己写了个

[html]
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<script>
window.onload = function() {
if (‘${name}’ != ”) {
document.getElementById(‘rememberMe’).checked = true;
} else {
document.getElementById(‘rememberMe’).checked = false;
}
}
</script>

2.然后在jsp顶部加入java代码，用于读取cookie

[html]
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<%
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，在登陆到后台验证完毕密码后面加入

[java]
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//处理Cookie
addCookie(username , pwd ,response ,request);

下面是addCookie这个方法

[java]
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/**Cookie的实现
* @throws UnsupportedEncodingException **/
private void addCookie(String name, String password,HttpServletResponse response, HttpServletRequest request) throws UnsupportedEncodingException {
if(StringUtils.isNotBlank(name)&&StringUtils.isNotBlank(password)){
//创建Cookie
// Cookie nameCookie=new Cookie(“name”,URLEncoder.encode(name,”utf-8″));
Cookie nameCookie=new Cookie(“name”,name);
Cookie pswCookie=new Cookie(“psw”,password);
//设置Cookie的父路径
nameCookie.setPath(request.getContextPath()+“/”);
pswCookie.setPath(request.getContextPath()+“/”);
//获取是否保存Cookie
String rememberMe=request.getParameter(“rememberMe”);
if(rememberMe==null){
//不保存Cookie
nameCookie.setMaxAge(0);
pswCookie.setMaxAge(0);
}else{
//保存Cookie的时间长度，单位为秒
nameCookie.setMaxAge(7*24*60*60);
pswCookie.setMaxAge(7*24*60*60);
}
//加入Cookie到响应头
response.addCookie(nameCookie);
response.addCookie(pswCookie);
}
}
}
1.首先是用户名，密码的input 和保存状态的checkbox
[html]
view plain
copy
1. <input class=“ipt” type=“text” name=‘username’ value=‘${name}’/>
2. <input class=“ipt” type=‘password’ name=‘password’ id=‘password’ />
3. <input style=” margin-left:60px; margin-right:10px; ” type=“checkbox” name=“rememberMe” id=“rememberMe” />
没找到怎么保存checkbox的状态，我就自己写了个
[html]
view plain
copy
1. <script>
2. window.onload = function() {
3. if (‘${name}’ != ”) {
4. document.getElementById(‘rememberMe’).checked = true;
5. } else {
6. document.getElementById(‘rememberMe’).checked = false;
7. }
8. }
9. </script>
2.然后在jsp顶部加入java代码，用于读取cookie
[html]
view plain
copy
1. <%
2. String name = “”;
3. String psw = “”;
4. String checked = “”;
5. Cookie[] cookies = request.getCookies();
6. if(cookies != null && cookies.length>0){
7. for(int i =0; i<cookies.length; i++){
8. if(cookies[i].getName().equals(“name”)){
9. name=cookies[i].getValue();
10. request.setAttribute(“name”,name);
11. }
13. if(cookies[i].getName().equals(“psw”)){
14. psw=cookies[i].getValue();
15. request.setAttribute(“psw”,psw);
16. }
17. }
18. }
19. %>
3.其次，在登陆到后台验证完毕密码后面加入
[java]
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1. //处理Cookie
2. addCookie(username , pwd ,response ,request);
下面是addCookie这个方法
[java]
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1. /**Cookie的实现
2. * @throws UnsupportedEncodingException **/
3. private void addCookie(String name, String password,HttpServletResponse response, HttpServletRequest request) throws UnsupportedEncodingException {
4. if(StringUtils.isNotBlank(name)&&StringUtils.isNotBlank(password)){
5. //创建Cookie
6. // Cookie nameCookie=new Cookie(“name”,URLEncoder.encode(name,”utf-8″));
7. Cookie nameCookie=new Cookie(“name”,name);
8. Cookie pswCookie=new Cookie(“psw”,password);
10. //设置Cookie的父路径
11. nameCookie.setPath(request.getContextPath()+“/”);
12. pswCookie.setPath(request.getContextPath()+“/”);
14. //获取是否保存Cookie
15. String rememberMe=request.getParameter(“rememberMe”);
16. if(rememberMe==null){
  //不保存Cookie
17. nameCookie.setMaxAge(0);
18. pswCookie.setMaxAge(0);
19. }else{
  //保存Cookie的时间长度，单位为秒
20. nameCookie.setMaxAge(7*24*60*60);
21. pswCookie.setMaxAge(7*24*60*60);
22. }
23. //加入Cookie到响应头
24. response.addCookie(nameCookie);
25. response.addCookie(pswCookie);
26. }
27. }
28. }
29. 这是我借鉴CSDN一位前辈的