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@GetMapping("/login")
 public String greetingForm(Model model) {
    model.addAttribute("User2", new User());
    return "login";
}
@PostMapping("/login")
public String greetingSubmit(@ModelAttribute User regUser) {
    //userRepository.save(regUser);
    //String teststr = regUser.getName();
    //System.out.println(teststr);
    return "result";
}

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Getting Started: Handling Form Submission</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
    <h1>Form</h1>
    <form action="#" th:action="@{/demo/login}" th:object="${User2}" method="post">
        <p>Username: <input type="text" th:field="*{name}" /></p>
        <p>Password: <input type="text" th:field="*{password}" /></p>
        <p>Balance: <input type="text" th:field="*{balance}" /></p>
        <p><input type="submit" value="Submit" /> <input type="reset" value="Reset" /></p>
    </form>
</body>
</html>

@Entity // This tells Hibernate to make a table out of this class
public class User {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;

    private String name;

    private String password;

    private int balance;

    public int getBalance() {
        return balance;
    }

    public void setBalance(int balance) {
        this.balance = balance;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Getting Started: Handling Form Submission</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
    <h1>Result</h1>
    <p th:text="'username: ' + ${User.name}" />
    <p th:text="'password: ' + ${regUser != null ? regUser.password : 'NOT FOUND'}" />
    <p th:text="'balance: ' + ${model != null ? regUser.balance : 'NOT FOUND'}" />
    <a href="/demo/login">Submit another user?</a>
</body>
</html>

<p th:text="'username: ' + ${User.name}" />

${User2.name}
${User}
${User2}
${regUser.name}
${teststr}
${#User.name}

${user.name}

model.addAttribute("User2", new User());

@PostMapping("/login")
public String greetingSubmit(@ModelAttribute(name = "User") User regUser) {