spring boot(十五)spring boot+thymeleaf+jpa增刪改查示例
阿新 • • 發佈：2018-06-23
ali 遍歷 config link examples 技術分享 返回 stat 業務
快速上手
配置文件
pom包配置
pom包裏面添加jpa和thymeleaf的相關包引用
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency> 在application.properties中添加配置
spring.datasource.url=jdbc:mysql://127.0.0.1/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
spring.jpa.show-sql= true
spring.thymeleaf.cache=false 其中propertiesspring.thymeleaf.cache=false是關閉thymeleaf的緩存，不然在開發過程中修改頁面不會立刻生效需要重啟，生產可配置為true。
在項目resources目錄下會有兩個文件夾：static目錄用於放置網站的靜態內容如css、js、圖片；templates目錄用於放置項目使用的頁面模板。
啟動類
啟動類需要添加Servlet的支持
@SpringBootApplication
public class JpaThymeleafApplication extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(JpaThymeleafApplication.class);
}
public static void main(String[] args) throws Exception {
SpringApplication.run(JpaThymeleafApplication.class, args);
}
} 數據庫層代碼
實體類映射數據庫表
@Entity
public class User {
@Id
@GeneratedValue
private long id;
@Column(nullable = false, unique = true)
private String userName;
@Column(nullable = false)
private String password;
@Column(nullable = false)
private int age;
...
}繼承JpaRepository類會自動實現很多內置的方法，包括增刪改查。也可以根據方法名來自動生成相關sql，具體可以參考：springboot(五)：spring data jpa的使用
public interface UserRepository extends JpaRepository<User, Long> {
User findById(long id);
Long deleteById(Long id);
}業務層處理
service調用jpa實現相關的增刪改查，實際項目中service層處理具體的業務代碼。
@Service
public class UserServiceImpl implements UserService{
@Autowired
private UserRepository userRepository;
@Override
public List<User> getUserList() {
return userRepository.findAll();
}
@Override
public User findUserById(long id) {
return userRepository.findById(id);
}
@Override
public void save(User user) {
userRepository.save(user);
}
@Override
public void edit(User user) {
userRepository.save(user);
}
@Override
public void delete(long id) {
userRepository.delete(id);
}
}Controller負責接收請求，處理完後將頁面內容返回給前端。
@Controller
public class UserController {
@Resource
UserService userService;
@RequestMapping("/")
public String index() {
return "redirect:/list";
}
@RequestMapping("/list")
public String list(Model model) {
List<User> users=userService.getUserList();
model.addAttribute("users", users);
return "user/list";
}
@RequestMapping("/toAdd")
public String toAdd() {
return "user/userAdd";
}
@RequestMapping("/add")
public String add(User user) {
userService.save(user);
return "redirect:/list";
}
@RequestMapping("/toEdit")
public String toEdit(Model model,Long id) {
User user=userService.findUserById(id);
model.addAttribute("user", user);
return "user/userEdit";
}
@RequestMapping("/edit")
public String edit(User user) {
userService.edit(user);
return "redirect:/list";
}
@RequestMapping("/delete")
public String delete(Long id) {
userService.delete(id);
return "redirect:/list";
}
}return "user/userEdit";代表會直接去resources目錄下找相關的文件。return "redirect:/list";代表轉發到對應的controller，這個示例就相當於刪除內容之後自動調整到list請求，然後再輸出到頁面。
頁面內容
list列表
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<title>userList</title>
<link rel="stylesheet" th:href="@{/css/bootstrap.css}"></link>
</head>
<body class="container">
<br/>
<h1>用戶列表</h1>
<br/><br/>
<div class="with:80%">
<table class="table table-hover">
<thead>
<tr>
<th>#</th>
<th>User Name</th>
<th>Password</th>
<th>Age</th>
<th>Edit</th>
<th>Delete</th>
</tr>
</thead>
<tbody>
<tr th:each="user : ${users}">
<th scope="row" th:text="${user.id}">1</th>
<td th:text="${user.userName}">neo</td>
<td th:text="${user.password}">Otto</td>
<td th:text="${user.age}">6</td>
<td><a th:href=