ajax用户登陆获取不到session里的验证码

Question

session验证码ajaxSSH

Answer 1

session不同步导致的，你是异步登录操作，那么获取session也应该异步。。

Answer 2

呃，上周五的时候又改成Extjs做了，还是取不到session里的验证码的值。EXt的验证码代码段：new Ext.Panel(
{
baseCls : "x-plain",
layout : 'column',
width : 290,
height : 38,
items : [
{
layout : "form",
columnWidth : .7,
labelWidth : 97,
items : [ {
xtype : "textfield",
width : 90,
fieldLabel : "Codingss",
name : "image",
allowBlank : true,
} ],
},
{
columnWidth : .3,
html : "<a href='javascript:void(0)'><img border='0' src='pages/image.jsp' id='image'  onClick='to('pages/login.jsp');'></a>",
} ],
}) ],
buttons : [
{
text : "Submit",
type : "submit",
handler : function() {
if (form1.form.isValid()) {
form1.form
.submit({
waitMsg : "Loging......",
url : "login.action",
method : "post",
success : function(
form, action) {
Ext.Msg
.alert(
"Tips",
"LoginSuccess!");
document.location = "index.jsp";
},
failure : function(
form, action) {
Ext.Msg
.alert(
"Tips",
action.result.message);
}
});
}
}
}  验证码存入session： // 将认证码存入SESSION
session.setAttribute("rand",sRand);
System.out.println("新的验证码"+sRand);
// 图象生效
g.dispose();
OutputStream output=response.getOutputStream();
// 输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
output.flush();
out.clear();
out = pageContext.pushBody();
action代码：//String rand=(String)ServletActionContext.getRequest().getSession().getAttribute("rand");
String rand=(String)ActionContext.getContext().getSession().get("rand");

Answer 3

呃，上周五的时候又改成Extjs做了，还是取不到session里的验证码的值。EXt的验证码代码段：new Ext.Panel(
                                        {
                                            baseCls : "x-plain",
                                            layout : 'column',
                                            width : 290,
                                            height : 38,
                                            items : [
                                                    {
                                                        layout : "form",
                                                        columnWidth : .7,
                                                        labelWidth : 97,
                                                        items : [ {
                                                            xtype : "textfield",
                                                            width : 90,
                                                            fieldLabel : "Codingss",
                                                            name : "image",
                                                            allowBlank : true,
                                                        } ],
                                                    },
                                                    {
                                                        columnWidth : .3,
                                                        html : "<a href='javascript:void(0)'><img border='0' src='pages/image.jsp' id='image'  onClick='to('pages/login.jsp');'></a>",
                                                    } ],
                                        }) ],
                        buttons : [
                                {
                                    text : "Submit",
                                    type : "submit",
                                    handler : function() {
                                        if (form1.form.isValid()) {
                                            form1.form
                                                    .submit({
                                                        waitMsg : "Loging......",
                                                        url : "login.action",
                                                        method : "post",
                                                        success : function(
                                                                form, action) {
                                                            Ext.Msg
                                                                    .alert(
                                                                            "Tips",
                                                                            "LoginSuccess!");
                                                            document.location = "index.jsp";
                                                        },
                                                        failure : function(
                                                                form, action) {
                                                            Ext.Msg
                                                                    .alert(
                                                                            "Tips",
                                                                            action.result.message);
                                                        }
                                                    });
                                        }
                                    }
                                }
  验证码存入session： // 将认证码存入SESSION
session.setAttribute("rand",sRand);
            System.out.println("新的验证码"+sRand);
// 图象生效
g.dispose();
OutputStream output=response.getOutputStream();
// 输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
output.flush();
out.clear();
out = pageContext.pushBody();action代码：//String rand=(String)ServletActionContext.getRequest().getSession().getAttribute("rand");
            String rand=(String)ActionContext.getContext().getSession().get("rand");

Answer 4

怎么放的，还怎么取，用request.getSession().getAttribute("rand")

Answer 5

session.getAttribute("rand")呢？

Answer 6

我那段注释掉的代码//String rand=(String)ServletActionContext.getRequest().getSession().getAttribute("rand"); 就是之前用request取的，不过没有取到

Answer 7

session.setAttribute("rand",sRand);
            System.out.println("新的验证码"+sRand);
这两句放到生成验证码最后面。

Answer 8

把那两句放到out = pageContext.pushBody();后面吗

Answer 9

这个和同步，异步没有关系 ，建议你装一个fiddler监控一下http的请求，这样分析起来会容易很多，另外补一下http协议相关的知识

Answer 10

你的ajax是不是跨域了， 跨域请求的时候， 服务器session会发生改变，所以session里面原来存储的验证码的值不存在了，也就为null了