SpringBoot用户CRUD

1.准备

http://start.spring.io/ 这里地址去直接生成你需要的项目信息，如何你本身ide以及集成了springboot 那么可以直接生成项目信息

　需要的知识：java，spring，springmvc，thymelafe

2开始

根据图片项目结构信息可以推断，我们需要写下面几个类：

package com.dgw.boot.dgw.domain;

/**
 * @author DGW-PC
 * @data   2018年7月17日
 */
public class User{
    
    private Long id;
    private String name;
    private String email;
    
    public User() {
        
    }
    
    public User(Long id, String name, String email) {
        this.id = id;
        this.name = name;
        this.email = email;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", email=" + email + "]";
    }

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public String getEmail() {
        return email;
    }

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

Dao beans

public interface UserRepository {
    
    User savaOrUpdateUser(User user);
    
    void deleteUser(long id);
    
    User getUserById(long id);
    
    List<User> listUsre();
    

}

@Repository
public class UserRepositoryImpl implements UserRepository {

    private static AtomicLong count=new AtomicLong();
    private ConcurrentMap<Long, User> useMap=new ConcurrentHashMap<>();
    
    @Override
    public User savaOrUpdateUser(User user) {
        Long id = user.getId();
        if(id==null) {
            id=count.incrementAndGet();
            user.setId(id);
        }
        this.useMap.put(id, user);
        return user;
    }

    @Override
    public void deleteUser(long id) {
        this.useMap.remove(id);
    }

    @Override
    public User getUserById(long id) {
        return this.useMap.get(id);
    }

    @Override
    public List<User> listUsre() {
        return new ArrayList<>(this.useMap.values());
    }

}

 控制器：

/**
     * 从 用户存储库 获取用户列表
     * @return
     */
    private List<User> getUserlist() {
         return userRepository.listUser();
    }

    /**
     * 查询所用用户
     * @return
     */
    @GetMapping
    public ModelAndView list(Model model) {
        model.addAttribute("userList", getUserlist());
        model.addAttribute("title", "用户管理");
        return new ModelAndView("users/list", "userModel", model);
    }
 
    /**
     * 根据id查询用户
     * @param message
     * @return
     */
    @GetMapping("{id}")
    public ModelAndView view(@PathVariable("id") Long id, Model model) {
        User user = userRepository.getUserById(id);
        model.addAttribute("user", user);
        model.addAttribute("title", "查看用户");
        return new ModelAndView("users/view", "userModel", model);
    }

    /**
     * 获取 form 表单页面
     * @param user
     * @return
     */
    @GetMapping("/form")
    public ModelAndView createForm(Model model) {
        model.addAttribute("user", new User());
        model.addAttribute("title", "创建用户");
        return new ModelAndView("users/form", "userModel", model);
    }

    /**
     * 新建用户
     * @param user
     * @param result
     * @param redirect
     * @return
     */
    @PostMapping
    public ModelAndView create(User user) {
         user = userRepository.saveOrUpateUser(user);
        return new ModelAndView("redirect:/users");
    }

    /**
     * 删除用户
     * @param id
     * @return
     */
    @GetMapping(value = "delete/{id}")
    public ModelAndView delete(@PathVariable("id") Long id, Model model) {
        userRepository.deleteUser(id);
 
        model.addAttribute("userList", getUserlist());
        model.addAttribute("title", "删除用户");
        return new ModelAndView("users/list", "userModel", model);
    }

    /**
     * 修改用户
     * @param user
     * @return
     */
    @GetMapping(value = "modify/{id}")
    public ModelAndView modifyForm(@PathVariable("id") Long id, Model model) {
        User user = userRepository.getUserById(id);
 
        model.addAttribute("user", user);
        model.addAttribute("title", "修改用户");
        return new ModelAndView("users/form", "userModel", model);
    }