Question

java代码翻译 每行后面来个注释 小白真看不懂 毕业答辩老师要问的 急求大手子相助

具体实现系统登录功能的代码如下所示：
@RequestMapping(value="userlogin2")
public String ulogin(ModelMap modelMap,
@RequestParam(value = "username",required=false) String username,
@RequestParam(value = "password",required=false) String password,
HttpServletRequest request) {
Buyuser User = buyuserService.userlogin(username, password);
if(User != null) {
request.getSession().setAttribute("User", User);
request.getSession().setAttribute("userid", User.getId());
if(User.getUsername()!=null){
request.getSession().setAttribute("username", User.getUsername());
request.getSession().setAttribute("name", User.getName());
}
return "redirect:../index.html";
}else{
modelMap.put("msg", "用户名或密码错误，请重试！");
return "pages/user/userlogin";
}
}

Answer 1

@RequestMapping(value="userlogin2") 映射的url
public String ulogin(ModelMap modelMap, 参数model
@RequestParam(value = "username",required=false) String username, 参数用户名
@RequestParam(value = "password",required=false) String password,参数密码
HttpServletRequest request) {
Buyuser User = buyuserService.userlogin(username, password); 调用service校验用户名和密码
if(User != null) {如果用户存在
request.getSession().setAttribute("User", User);用户信息保存到session
request.getSession().setAttribute("userid", User.getId());用户的id保存到session
if(User.getUsername()!=null){用户名不为空
request.getSession().setAttribute("username", User.getUsername());用户名保存到session
request.getSession().setAttribute("name", User.getName());名称保存到session
}
return "redirect:../index.html";返回主页index.html
}else{
modelMap.put("msg", "用户名或密码错误，请重试！");返回错误提示
return "pages/user/userlogin";返回错误页面
}
}