如何将在控制器中找到的数据发送到视图？

Question

我尝试做一个 java 网络应用程序使用：
SpringBoot
Mysql
JDBC
设计模式：MVC、DAO
还有百里香
我想我明白了：
我必须为每个实体创建一个 class 和一个使用注解 @Repository:
的 DAO classe Diabetic.java（实体）：

    public class Diabetic {

    private int id_diabetic;
    private int id_doctor;
    private String name;
    private String firstname;
    private Date birthdate;
    private String mail;
    private String password;
    private String phone;
    private String emergencyContact;
    private String address;

    public Diabetic() {
    }

    public Diabetic(int id_diabetic, int id_doctor, String name, String firstname, Date birthdate,
                    String mail, String password, String phone, String emergencyContact, String address) {
        this.id_diabetic = id_diabetic;
        this.id_doctor = id_doctor;
        this.name = name;
        this.firstname = firstname;
        this.birthdate = birthdate;
        this.mail = mail;
        this.password = password;
        this.phone = phone;
        this.emergencyContact = emergencyContact;
        this.address = address;
    }

    public int getId_diabetic() {
        return id_diabetic;
    }

    public void setId_diabetic(int id_diabetic) {
        this.id_diabetic = id_diabetic;
    }

    public int getId_doctor() {
        return id_doctor;
    }

    public void setId_doctor(int id_doctor) {
        this.id_doctor = id_doctor;
    }

    public String getName() {
        return name;
    }

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

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    public Date getBirthdate() {
        return birthdate;
    }

    public void setBirthdate(Date birthdate) {
        this.birthdate = birthdate;
    }

    public String getMail() {
        return mail;
    }

    public void setMail(String mail) {
        this.mail = mail;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getEmergencyContact() {
        return emergencyContact;
    }

    public void setEmergencyContact(String emergencyContact) {
        this.emergencyContact = emergencyContact;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

DiabeticDAO.java:

@Repository
public class DiabeticDAO {

    private JdbcTemplate jdbcTemplate;
    private SimpleJdbcInsert simpleJdbcInsert;

    @Autowired
    public void setDataSource(DataSource dataSource){
        this.jdbcTemplate = new JdbcTemplate(dataSource);
        this.simpleJdbcInsert = new SimpleJdbcInsert(dataSource).withTableName("diabetic")
                .usingGeneratedKeyColumns("id_diabetic");
    }

    public Diabetic getDiabById(int id){
        return jdbcTemplate.queryForObject("select * from Diabetic where id_diabetic=?", new DiabeticRowMapper(),id);
    }

    public List<Diabetic> getAllDiab(){
        return jdbcTemplate.query("select * from Diabetic",new DiabeticRowMapper());

    }

    private final class DiabeticRowMapper implements RowMapper<Diabetic> {
        @Override
        public Diabetic mapRow(ResultSet rs, int rowNum) throws SQLException{
            Diabetic diabetic = new Diabetic();
            diabetic.setId_diabetic(rs.getInt("id_diabetic"));
            diabetic.setName(rs.getString("name"));
            diabetic.setFirstname(rs.getString("firstname"));
            diabetic.setBirthdate(rs.getDate("birthdate"));
            diabetic.setMail(rs.getString("mail"));
            diabetic.setPassword(rs.getString("password"));
            diabetic.setPhone(rs.getString("phone"));
            diabetic.setEmergencyContact(rs.getString("emergencyContact"));
            diabetic.setAddress(rs.getString("address"));
            return diabetic;
        }

    }
}

然后创建一个这样的控制器，我使用 DAO 中的方法：

@Controller
public class MainController {

    @GetMapping("/")
    public String firstPage(){
        return"firstPage";
    }

    @GetMapping("/authentification")
    public String auth(){
        DiabeticDAO diaDao = new DiabeticDAO();
        List<Diabetic> listDia = diaDao.getAllDiab();
        return"loggin";
    }

不明白的地方：

如何在视图 (html) 中执行 link 以转到控制器？
如何将在控制器中找到的数据发送到视图以显示它们？

对不起，如果我的问题看起来很奇怪，但这是我第一次在这里寻求帮助，英语不是我的母语

Answer 1

您不必 link 视图中的控制器。通过控制器的 URL 调用处理连接。

我从这篇介绍中举了一些例子： https://www.thymeleaf.org/doc/articles/springmvcaccessdata.html

您可以使用多种方法将数据添加到视图。

1.选项：

@RequestMapping(value = "message", method = RequestMethod.GET)
   public String messages(Model model) {
   model.addAttribute("messages", messageRepository.findAll());
   return "message/list";
}

在这个方法中，我们将“模型模型”作为方法的参数。您现在可以用一些数据填充模型。

2。选项：

@RequestMapping(value = "message", method = RequestMethod.GET)
public ModelAndView messages() {
   ModelAndView mav = new ModelAndView("message/list");
   mav.addObject("messages", messageRepository.findAll());
   return mav;
}

在这个方法中，我们创建了一个 ModelAndView 对象，设置了应该调用的 url 并用数据填充它。数据再次被称为“消息”。 return值为创建的对象。

在视图中访问数据：

实施两个选项之一后，您可以像这样访问数据：

<tr th:each="message : ${messages}">
   <td th:text="${message.id}">1</td>
   <td><a href="#" th:text="${message.title}">Title ...</a></td>
   <td th:text="${message.text}">Text ...</td>
</tr>

让我们尝试将其实现到您当前的代码中：

@Controller
public class MainController {

    @GetMapping("/")
    public String firstPage(){
        return"firstPage";
    }

    @GetMapping("/authentification")
    public String auth(Model model){
        DiabeticDAO diaDao = new DiabeticDAO();
        List<Diabetic> listDia = diaDao.getAllDiab();
        model.addAttribute("listdia", listDia);
        return"loggin";
    }
}

现在您可以访问视图中的数据了：

<tr th:each="dia: ${listdia}">
   <td th:text="${dia.id_diabetic}">1</td>
   <td><a href="#" th:text="${dia.name}">Name</a></td>
   <td th:text="${dia.firstname}">Firstname</td>
</tr>

如何将在控制器中找到的数据发送到视图？

How to send the data finded in the controller to a view?

java

spring-boot

thymeleaf

spring-jdbc