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：
1 package com.dgw.boot.dgw.domain;
2
3 /**
4 * @author DGW-PC
5 * @data 2018年7月17日
6 */
7 public class User{
8
9 private Long id;
10 private String name;
11 private String email;
12
13 public User() {
14
15 }
16
17 public User(Long id, String name, String email) {
18 this.id = id;
19 this.name = name;
20 this.email = email;
21 }
22
23 @Override
24 public String toString() {
25 return "User [id=" + id + ", name=" + name + ", email=" + email + "]";
26 }
27
28 public Long getId() {
29 return id;
30 }
31
32 public void setId(Long id) {
33 this.id = id;
34 }
35
36 public String getName() {
37 return name;
38 }
39
40 public void setName(String name) {
41 this.name = name;
42 }
43
44 public String getEmail() {
45 return email;
46 }
47
48 public void setEmail(String email) {
49 this.email = email;
50 }
51
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：
1 /**
2 * 从 用户存储库 获取用户列表
3 * @return
4 */
5 private List<User> getUserlist() {
6 return userRepository.listUser();
7 }
8
9 /**
10 * 查询所用用户
11 * @return
12 */
13 @GetMapping
14 public ModelAndView list(Model model) {
15 model.addAttribute("userList", getUserlist());
16 model.addAttribute("title", "用户管理");
17 return new ModelAndView("users/list", "userModel", model);
18 }
19
20 /**
21 * 根据id查询用户
22 * @param message
23 * @return
24 */
25 @GetMapping("{id}")
26 public ModelAndView view(@PathVariable("id") Long id, Model model) {
27 User user = userRepository.getUserById(id);
28 model.addAttribute("user", user);
29 model.addAttribute("title", "查看用户");
30 return new ModelAndView("users/view", "userModel", model);
31 }
32
33 /**
34 * 获取 form 表单页面
35 * @param user
36 * @return
37 */
38 @GetMapping("/form")
39 public ModelAndView createForm(Model model) {
40 model.addAttribute("user", new User());
41 model.addAttribute("title", "创建用户");
42 return new ModelAndView("users/form", "userModel", model);
43 }
44
45 /**
46 * 新建用户
47 * @param user
48 * @param result
49 * @param redirect
50 * @return
51 */
52 @PostMapping
53 public ModelAndView create(User user) {
54 user = userRepository.saveOrUpateUser(user);
55 return new ModelAndView("redirect:/users");
56 }
57
58 /**
59 * 删除用户
60 * @param id
61 * @return
62 */
63 @GetMapping(value = "delete/{id}")
64 public ModelAndView delete(@PathVariable("id") Long id, Model model) {
65 userRepository.deleteUser(id);
66
67 model.addAttribute("userList", getUserlist());
68 model.addAttribute("title", "删除用户");
69 return new ModelAndView("users/list", "userModel", model);
70 }
71
72 /**
73 * 修改用户
74 * @param user
75 * @return
76 */
77 @GetMapping(value = "modify/{id}")
78 public ModelAndView modifyForm(@PathVariable("id") Long id, Model model) {
79 User user = userRepository.getUserById(id);
80
81 model.addAttribute("user", user);
82 model.addAttribute("title", "修改用户");
83 return new ModelAndView("users/form", "userModel", model);
84
