<form method="post" action="test.do" id="form">

  <input type="text" name="users[0].username"/>

  <input type="text" name="users[0].password"/>

　<input type="text" name="users[1].username"/>

  <input type="text" name="users[2].password"/>

</form>

public class UserList{

  private List<User> users;

  public List<User> getUsers(){return users;}

  public void setUsers(List<User> users){this.users=users;}

  public UserList(){super();}

  public UserList(List<User> users){

       super();

       this.users=users;

  }

   @RequestMapping("/insertData")

    public String insertData(UserList userList) {
　　　　　　//
　　　　  }