springboot快速創建項目框架

一、項目框架準備

1.1 新建maven空項目，併在pom中引入依賴

 1     <parent>
 2         <groupId>org.springframework.boot</groupId>
 3         <artifactId>spring-boot-starter-parent</artifactId>
 4         <version>2.1.12.RELEASE</version>
 5     </parent>
 6 
 7     <properties>
 8         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 9         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
10         <java.version>1.8</java.version>
11     </properties>
12 
13     <dependencies>
14         <!-- web啟動器 -->
15         <dependency>
16             <groupId>org.springframework.boot</groupId>
17             <artifactId>spring-boot-starter-web</artifactId>
18         </dependency>
19         <!--jdbc連接及其啟動器 -->
20         <dependency>
21             <groupId>org.springframework.boot</groupId>
22             <artifactId>spring-boot-starter-data-jdbc</artifactId>
23         </dependency>
24         <dependency>
25             <groupId>mysql</groupId>
26             <artifactId>mysql-connector-java</artifactId>
27             <version>5.1.48</version>
28         </dependency>
29         <!--tk.mybatis及mybatis啟動器 -->
30         <dependency>
31             <groupId>org.mybatis.spring.boot</groupId>
32             <artifactId>mybatis-spring-boot-starter</artifactId>
33             <version>1.3.2</version>
34         </dependency>
35         <dependency>
36             <groupId>tk.mybatis</groupId>
37             <artifactId>mapper-spring-boot-starter</artifactId>
38             <version>2.1.5</version>
39         </dependency>
40         <!--thymeleaf啟動器 -->
41         <dependency>
42             <groupId>org.springframework.boot</groupId>
43             <artifactId>spring-boot-starter-thymeleaf</artifactId>
44         </dependency>
45     </dependencies>
46 
47     <build>
48         <plugins>
49             <plugin>
50                 <groupId>org.springframework.boot</groupId>
51                 <artifactId>spring-boot-maven-plugin</artifactId>
52             </plugin>
53         </plugins>
54     </build>

1.2 準備mysql數據表

 1 CREATE TABLE `user` (
 2   `id` int(11) NOT NULL AUTO_INCREMENT,
 3   `username` varchar(255) NOT NULL,
 4   `password` varchar(255) NOT NULL,
 5   `birthday` date DEFAULT NULL,
 6   `address` varchar(255) DEFAULT NULL,
 7   PRIMARY KEY (`id`)
 8 ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4;
 9 INSERT INTO `user` VALUES ('1', '張三', '12345', '2020-01-16', '許昌市');
10 INSERT INTO `user` VALUES ('2', '李四', '54321', '2020-01-01', '河南省許昌市');

二、實現數據的展示

2.1 新建啟動入口並測試

在java文件夾中新建 MyApplication.java 文件，作為程式的啟動入口。

1 @SpringBootApplication
2 public class MyApplication {
3     public static void main(String[] args) {
4         SpringApplication.run(MyApplication.class, args);
5     }
6 }

在resources文件夾中新建application.yml文件，配置埠和資料庫連接

1 server:
2   port: 7001
3 spring:
4   datasource:
5     driver-class-name: com.mysql.jdbc.Driver
6     url: jdbc:mysql://localhost:3306/mydb
7     username: root
8     password: fanbao0713

新建controller --> UserController.java 文件，並啟動測試：http://localhost:7001/user/hello

1 @RestController
2 @RequestMapping("user")
3 public class UserController {
4     @GetMapping("hello")
5     public String hello(){
6         return "Hello World!";
7     }
8 }

2.2 資料庫連接配置

新建 pojo --> User.java 文件：

 1 @Table(name = "user")
 2 public class User {
 3     @Id
 4     @GeneratedValue(strategy = GenerationType.IDENTITY)
 5     private Integer id;
 6     private String username;
 7     private String password;
 8     private Date birthday;
 9     private String address;
10 
11     public Integer getId() {
12         return id;
13     }
14 
15     public void setId(Integer id) {
16         this.id = id;
17     }
18 
19     public String getUsername() {
20         return username;
21     }
22 
23     public void setUsername(String username) {
24         this.username = username;
25     }
26 
27     public String getPassword() {
28         return password;
29     }
30 
31     public void setPassword(String password) {
32         this.password = password;
33     }
34 
35     public Date getBirthday() {
36         return birthday;
37     }
38 
39     public void setBirthday(Date birthday) {
40         this.birthday = birthday;
41     }
42 
43     public String getAddress() {
44         return address;
45     }
46 
47     public void setAddress(String address) {
48         this.address = address;
49     }
50 }

在 application.yml 文件中，新增mybatis關聯

1 mybatis:
2   type-aliases-package: com.springbootdemo.pojo

在 mapper --> UserMapper.java 文件：

1 @Mapper
2 public interface UserMapper extends tk.mybatis.mapper.common.Mapper<User> {
3 }

在 service --> UserService.java 文件，由於tk.mybati不是spring官方插件，“userMapper”會報錯，可以忽略：

 1 @Service
 2 public class UserService {
 3     @Autowired
 4     private UserMapper userMapper;
 5 
 6     public User selectById(Long id){
 7         return this.userMapper.selectByPrimaryKey(id);
 8     }
 9 
10     public List<User> selectAll(){
11         return userMapper.selectAll();
12     }
13 }

在 controller --> UserController.java 文件中，展示介面，併進行測試：http://localhost:7001/user/findAll

 1 @RestController
 2 @RequestMapping("user")
 3 public class UserController {
 4     @Autowired
 5     private UserService userService;
 6 
 7     @GetMapping("{id}")
 8     public User selectById(@PathVariable("id") Long id){
 9         return this.userService.selectById(id);
10     }
11 
12     @GetMapping("findAll")
13     public Map<String, Object> findAll(){
14         Map<String, Object> map = new HashMap<>();
15         map.put("用戶列表", userService.selectAll());
16         return map;
17     }
18 }

三、靜態資源訪問及攔截器

3.1 訪問靜態資源

在 resources 文件夾中新增static中，並加入目錄中，static中的各類資源可以直接訪問：http://localhost:7001/js/common.js

3.2 攔截器設置

在 interceptors --> UserInterceptor中，首先我們定義一個攔截器：

 1 @Component
 2 public class UserInterceptor implements HandlerInterceptor {
 3     @Override
 4     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
 5         System.out.println("preHandle/前置攔截器 method is running!");
 6         return true;
 7     }
 8 
 9     @Override
10     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
11         System.out.println("postHandle/運行攔截器 method is running!");
12     }
13 
14     @Override
15     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
16         System.out.println("postHandle/後置攔截器 method is running!");
17     }
18 }

新建 config --> MvcConfig.java 中，定義配置類，註冊攔截器：

 1 @Configuration
 2 public class MvcConfig implements WebMvcConfigurer {
 3     @Autowired
 4     private HandlerInterceptor handlerInterceptor;
 5 
 6     @Override
 7     public void addInterceptors(InterceptorRegistry registry) {
 8         registry.addInterceptor(handlerInterceptor).addPathPatterns("/**");
 9     }
10 }