一、Controller编写
1、页面跳转方法
@Controller
public class PageController {
//页面跳转方法
@RequestMapping("/{page}")
public String showPage(@PathVariable String page){
return page;
}
}
2、增删改查功能
@Controller
@RequestMapping("/user")
public class UsersController {
@Autowired
private UserService userService;
//添加用户
@PostMapping("/addUser")
public String addUser(Users users){
try{
this.userService.addUser(users);
}catch(Exception e){
e.printStackTrace();
return "error";
}
return "redirect:/ok";//避免表单二次提交
}
//查找所有用户信息
@GetMapping("/findUserAll")
public String findUserAll(Model model){
List<Users> list = null;
try{
list = this.userService.findUsersAll();
model.addAttribute("list",list);
}catch(Exception e){
e.printStackTrace();
return "error";
}
return "showUsers";
}
//根据id查找用户信息
@GetMapping("/preUpdateUser")
public String preUpdateUser(Integer id,Model model){
try{
Users user = this.userService.findUserById(id);
model.addAttribute("user",user);
}catch(Exception e){
e.printStackTrace();
return "error";
}
return "updateUser";
}
//根据id更新用户信息
@PostMapping("/updateUser")
public String updateUser(Users users){
try{
this.userService.modifyUser(users);
}catch(Exception e){
e.printStackTrace();
return "error";
}
return "redirect:/ok";
}
//根据id删除用户
@GetMapping("/deleteUser")
public String deleteUser(Integer id){
try{
this.userService.dropUser(id);
}catch(Exception e){
e.printStackTrace();
return "error";
}
return "redirect:/ok";
}
}
二、业务层编写
UserServiceImpl
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UsersDao usersDao;
@Override
@Transactional
public void addUser(Users users) {
this.usersDao.insertUsers(users);
}
@Override
public List<Users> findUsersAll() {
return this.usersDao.selectUsersAll();
}
@Override
public Users findUserById(Integer id) {
return this.usersDao.selectUserById(id);
}
@Override
@Transactional
public void modifyUser(Users users) {
this.usersDao.updateUsers(users);
}
@Override
@Transactional
public void dropUser(Integer id) {
this.usersDao.deleteUserById(id);
}
}
三、持久层编写
UsersDaoImpl
@Repository
public class UsersDaoImpl implements UsersDao {
@Autowired
private JdbcTemplate jdbcTemplate;
//添加用户
@Override
public void insertUsers(Users users) {
String sql = "insert into user(name,gender) values(?,?)";
this.jdbcTemplate.update(sql,users.getName(),users.getGender());
}
//查找所有用户信息
@Override
public List<Users> selectUsersAll() {
String sql = "select * from user";
return this.jdbcTemplate.query(sql, new RowMapper<Users>() {
@Override
public Users mapRow(ResultSet resultSet, int i) throws SQLException {
Users users = new Users();
users.setId(resultSet.getInt("id"));
users.setName(resultSet.getString("name"));
users.setGender(resultSet.getString("gender"));
return users;
}
});
}
//根据id查找用户信息
@Override
public Users selectUserById(Integer id) {
Users user = new Users();
String sql = "select * from user where id = ?";
Object[] arry = new Object[]{id};
this.jdbcTemplate.query(sql, arry, new RowCallbackHandler() {
@Override
public void processRow(ResultSet resultSet) throws SQLException {
user.setId(resultSet.getInt("id"));
user.setName(resultSet.getString("name"));
user.setGender(resultSet.getString("gender"));
}
});
return user;
}
//根据id更新用户信息
@Override
public void updateUsers(Users users) {
String sql = "update user set name = ?,gender = ? where id = ?";
this.jdbcTemplate.update(sql,users.getName(),users.getGender(),users.getId());
}
//根据id删除用户
@Override
public void deleteUserById(Integer id) {
String sql = "delete from user where id = ?";
this.jdbcTemplate.update(sql,id);
}
}
四、简单前端页面部分代码
所有页面开头需加入 Thymeleaf 支持
<html lang="en" xmlns:th="http://www.thymeleaf.org">
还需编写成功提示页和失败页面,随需求添加即可。
1、用户信息展示页
<table border="1" align="center">
<tr>
<th>用户ID</th>
<th>用户姓名</th>
<th>用户性别</th>
<th>操作</th>
</tr>
<tr th:each="u : ${list}">
<td th:text="${u.id}"></td>
<td th:text="${u.name}"></td>
<td th:text="${u.gender}"></td>
<td>
<a th:href="@{/user/preUpdateUser(id=${u.id})}">修改</a>
<a th:href="@{/user/deleteUser(id=${u.id})}">删除</a>
</td>
</tr>
</table>
2、添加用户信息页
<form th:action="@{/user/addUser}" method="post">
<input type="text" name="name"><br/>
<input type="text" name="gender"><br/>
<input type="submit" value="添加">
</form>
3、更改用户信息页
<form th:action="@{/user/updateUser}" method="post">
<input type="hidden" name="id" th:value="${user.id}">
<input type="text" name="name" th:value="${user.name}"><br/>
<input type="text" name="gender" th:value="${user.gender}"><br/>
<input type="submit" value="添加">
</form>