这篇文章,介绍SpringBoot常用的配置和请求处理。大致分成三个部分介绍:常用的请求方式、Jpa配置、MySql配置。
如下是常用的几种请求方式:
get请求:一般用于查询数据,获取一些非重要性的信息。
post请求:一般用于插入数据。
put请求:一般用于数据更新。
delete请求:一般用于数据删除。
那么,在SpringBoot中,怎么对这些请求方式进行处理。(这里以最常用的get、post请求为例,其他的类似)
//get请求,获取url路径上的参数 @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请求,获取url请求参数的值 @RequestParam //localhost:8080/test?id=99 @RequestMapping(value = "/test", method = RequestMethod.GET) public String sayHello(@RequestParam Integer id) { return "id:" + id; } //get请求,获取url请求参数的值,增加参数映射,默认值 @RequestParam //required=false 表示url中可以无id参数,此时就使用默认参数 @RequestMapping(value = "/test2", method = RequestMethod.GET) public String sayHello2(@RequestParam(value = "id", required = false, defaultValue = "1") Integer id) { return "id:" + id; }
//post请求 //表单参数 @RequestMapping(value= "/getMessage", method = RequestMethod.POST) public String getMessage(int code, String message) { return "success"; } //post请求 //json raw参数 @PostMapping(value= "/getMessageBody") public String getMessagePost(@RequestBody HolidayEntity bean) { return "success"; } //匹配参数 //password如果匹配对,@RequestParam不写都ok public void login(@RequestParam("account") String name, @RequestParam String password) { System.out.println(name + ":" + password); } //@RequestHeader注解用来将请求头的内容绑定到方法参数上。 @PostMapping(value = "login") public void login2(@RequestHeader("access_token") String accessToken,@RequestParam String name) { System.out.println("accessToken:" + accessToken); }
组合注解(RequestMapping的变形) @GetMapping = @RequestMapping(method = RequestMethod.GET) @PostMapping = @RequestMapping(method = RequestMethod.POST) @PutMapping = @RequestMapping(method = RequestMethod.PUT) @DeleteMapping = @RequestMapping(method = RequestMethod.DELETE)
1.pom文件加入Jpa配置
<!--jpa--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency>
2.Application入口类增加@EnableJpaRepositories注解
@EnableJpaRepositories public class Application extends SpringBootServletInitializer {
3.dao接口
@Repository public interface HolidayRepository extends JpaRepository<HolidayEntity, Long> { @Query(value = "SELECT p FROM HolidayEntity p") List<HolidayEntity> queryHoliday(); }
4.entity类
@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调休 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.执行,获取数据
@Autowired private HolidayRepository holidayRepository; @RequestMapping("/test") @ResponseBody public List<HolidayEntity> test() { return holidayRepository.findAll(); }
1.pom文件加入MySql配置
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency>
2.application.properties文件配置MySql相关
# tomcat配置 server.port=8090 # 数据库配置 #Mysql属性配置文件,Spring-boot系统配置 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=*** #配置自动建表:updata:没有表新建,有表更新操作,控制台显示建表语句 #spring.jpa.hibernate.ddl-auto=update spring.jpa.show-sql=true spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect #如下的配置会导致报错 Unable to build Hibernate SessionFactory #spring.jpa.properties.hibernate.hbm2ddl.auto=validate