SpringBoot+Jpa+MySql 常用配置及請求
這篇文章,介紹SpringBoot常用的配置和請求處理。大致分成三個部分介紹:常用的請求方式、Jpa配置、MySql配置。
常用的請求方式
如下是常用的幾種請求方式:
get請求:一般用於查詢資料,獲取一些非重要性的資訊。
post請求:一般用於插入資料。
put請求:一般用於資料更新。
delete請求:一般用於資料刪除。
那麼,在SpringBoot中,怎麼對這些請求方式進行處理。(這裡以最常用的get、post請求為例,其他的類似)
get請求:
//get請求,獲取url路徑上的引數 @PathVariable //注:localhost:8080/test/11/hans @RequestMapping(value = "/test/{id}/{name}", method = RequestMethod.GET) public String sayHello(@PathVariable("id") Integer id, @PathVariable("name") String name) { return "id:" + id + " name:" + name; } //get請求,獲取url請求引數的值 @RequestParam //localhost:8080/test?id=99 @RequestMapping(value = "/test", method = RequestMethod.GET) public String sayHello(@RequestParam Integer id) { return "id:" + id; } //get請求,獲取url請求引數的值,增加引數對映,預設值 @RequestParam //required=false 表示url中可以無id引數,此時就使用預設引數 @RequestMapping(value = "/test2", method = RequestMethod.GET) public String sayHello2(@RequestParam(value = "id", required = false, defaultValue = "1") Integer id) { return "id:" + id; }
post請求:
//post請求 //表單引數 @RequestMapping(value= "/getMessage", method = RequestMethod.POST) public String getMessage(int code, String message){ return "success"; } //post請求 //json raw引數 @PostMapping(value= "/getMessageBody") public String getMessagePost(@RequestBody HolidayEntity bean){ return "success"; } //匹配引數 //password如果匹配對,@RequestParam不寫都ok public void login(@RequestParam("account") String name, @RequestParam String password) { System.out.println(name + ":" + password); } //@RequestHeader註解用來將請求頭的內容繫結到方法引數上。 @PostMapping(value = "login") public void login2(@RequestHeader("access_token") String accessToken,@RequestParam String name) { System.out.println("accessToken:" + accessToken); }
補充:
組合註解(RequestMapping的變形) @GetMapping = @RequestMapping(method = RequestMethod.GET) @PostMapping = @RequestMapping(method = RequestMethod.POST) @PutMapping = @RequestMapping(method = RequestMethod.PUT) @DeleteMapping = @RequestMapping(method = RequestMethod.DELETE)
Jpa配置
1.pom檔案加入Jpa配置
<!--jpa--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency>
2.Application入口類增加@EnableJpaRepositories註解
@EnableJpaRepositories public class Application extends SpringBootServletInitializer {
3.dao介面
@Repository public interface HolidayRepository extends JpaRepository<HolidayEntity, Long> { @Query(value = "SELECT p FROM HolidayEntity p") List<HolidayEntity> queryHoliday(); }
4.entity類
@Entity @Table(name = "holiday_scheme") @EntityListeners(AuditingEntityListener.class) public class HolidayEntity extends AbstractPersistable<Long> { @Column(name = "date") public String date; @Column(name = "hour") public String hour; @Column(name = "holiday") public String holiday; @Column(name = "holiday_explain") public String holiday_explain; @Column(name = "type") public String type;//SUB假期,ADD調休 public String getDate() { return date; } public void setDate(String date) { this.date = date; } public String getHour() { return hour; } public void setHour(String hour) { this.hour = hour; } public String getHoliday() { return holiday; } public void setHoliday(String holiday) { this.holiday = holiday; } public String getHoliday_explain() { return holiday_explain; } public void setHoliday_explain(String holiday_explain) { this.holiday_explain = holiday_explain; } public String getType() { return type; } public void setType(String type) { this.type = type; } @Override public String toString() { return "HolidayEntity{" + "date='" + date + '\'' + ", hour='" + hour + '\'' + ", holiday='" + holiday + '\'' + ", holiday_explain='" + holiday_explain + '\'' + ", type='" + type + '\'' + '}'; } }
5.執行,獲取資料
@Autowired private HolidayRepository holidayRepository; @RequestMapping("/test") @ResponseBody public List<HolidayEntity> test() { return holidayRepository.findAll(); }
MySql配置
1.pom檔案加入MySql配置
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency>
2.application.properties檔案配置MySql相關
# tomcat配置 server.port=8090 # 資料庫配置 #Mysql屬性配置檔案,Spring-boot系統配置 spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://*.*.*.*:3306/db?autoReconnect=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai spring.datasource.username=*** spring.datasource.password=*** #配置自動建表:updata:沒有表新建,有表更新操作,控制檯顯示建表語句 #spring.jpa.hibernate.ddl-auto=update spring.jpa.show-sql=true spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect #如下的配置會導致報錯 Unable to build Hibernate SessionFactory #spring.jpa.properties.hibernate.hbm2ddl.auto=validate