java代码需要添加注释

Question

问题遇到的现象和发生背景

问题相关代码，请勿粘贴截图

运行结果及报错内容

我的解答思路和尝试过的方法

我想要达到的结果

代码要加上主要部分的注释
```java
if(ac.equals("adminlogin"))
{
String username = request.getParameter("username");
String password = request.getParameter("pwd");
String utype = request.getParameter("cx");
String pagerandom = request.getParameter("pagerandom")==null?"":request.getParameter("pagerandom");
String random = (String)request.getSession().getAttribute("random");
if(!pagerandom.equals(random)&&request.getParameter("a")!=null)
{
request.setAttribute("random", "");
go("/login.jsp", request, response);
}
else{
String sql1="";
if (utype.equals("管理员")){sql1 = "select * from allusers where username='"+username+"' and pwd='"+password+"'"; }
//quxanxiaxndexnglxu
List<HashMap>userlist1 = dao.select(sql1);
if(userlist1.size()==1)
{
request.getSession(). setAttribute("username", username);
if (utype.equals("管理员"))
{
request.getSession(). setAttribute("cx",  userlist1.get(0).get("cx"));
}
else
{
request.getSession(). setAttribute("cx", utype);
}


gor("main.jsp", request, response);
}else{
request.setAttribute("error", "");
go("/login.jsp", request, response);
}

```

Answer 1

//如果ac是adminlogin则为true
if(ac.equals("adminlogin"))
{
//接收传递过来的用户名，密码，类型，验证码
String username = request.getParameter("username");
String password = request.getParameter("pwd");
String utype = request.getParameter("cx");
String pagerandom = request.getParameter("pagerandom")==null?"":request.getParameter("pagerandom");
String random = (String)request.getSession().getAttribute("random");
//判断验证码是否正确并且a的值不为空
if(!pagerandom.equals(random)&&request.getParameter("a")!=null)
{
//清空验证码，去登录界面
request.setAttribute("random", "");
go("/login.jsp", request, response);
}
else{
//验证码证确执行下面的
String sql1="";
if (utype.equals("管理员")){sql1 = "select * from allusers where username='"+username+"' and pwd='"+password+"'"; }
//查询数据库
List<HashMap>userlist1 = dao.select(sql1);
//如果查询到的数据只有一条，则存到session里面
if(userlist1.size()==1)
{
request.getSession(). setAttribute("username", username);
//判断类型是否为管理员
if (utype.equals("管理员"))
{
request.getSession(). setAttribute("cx",  userlist1.get(0).get("cx"));
}
else
{
request.getSession(). setAttribute("cx", utype);
}
//最后登录成功了，去主页main.jsp
go("main.jsp", request, response);
}else{
//出现登录失败其他问题则回到登录界面，并传递error是空
request.setAttribute("error", "");
go("/login.jsp", request, response);