案例代码实现1

案例代码实现1

写人实体类

package pojo;

public class User {
    private int id;
    private String name;
    private String gender;
    private int age;
    private String address;
    private String qq;
    private String email;

    public User(int id, String name, String gender, int age, String address, String qq, String email) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.address = address;
        this.qq = qq;
        this.email = email;
    }

    public User() {
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

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

    public String getQq() {
        return qq;
    }

    public void setQq(String qq) {
        this.qq = qq;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                ", qq='" + qq + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

我们在dao层创建一个查询全部的方法接口

public interface UserDao {
    public List<User> fileAll();
}

实现接口

public class UserDaoImpl implements UserDao {
    private UserDao dao = new UserDaoImpl();
    @Override
    public List<User> fileAll() {
        return dao.fileAll();
    }
}

然后在Servlce创建接口，实现接口

public interface UserServlce {
    public List<User> fileAll();
}

public class UserServlceImpl implements UserServlce {
    @Override
    public List<User> fileAll() {
        return null;
    }
}

在Web包实现跳转

@WebServlet( value = "/UserListServlet")
public class UserListServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request,response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        调用UserServlet完成查询
        UserServlceImpl servlce = new UserServlceImpl();
        List<User> users = servlce.fileAll();
        request.setAttribute("user",users);
//       转发
        request.getRequestDispatcher("/list.jsp").forward(request,response);
    }
}