项目配置
@Value(“${变量名}”)
变量名：配置文件中的全局变量
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@Value("${name}")
private String name;
@Value("${desc}")
private String desc;
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yml配置文件中的配置
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name: 维吉尔
desc: 你好，${name}！
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@ConfigurationProperties(prefix = “对象名”)
@ConfigurationProperties(prefix = “person”)注解要和@Component一起用
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@Component
@ConfigurationProperties(prefix = "person")
public class Person {
private String name;
private int age;
private String sex;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
@Override
public String toString() {
final StringBuffer sb = new StringBuffer("Person{");
sb.append("name='").append(name).append('\'');
sb.append(", age=").append(age);
sb.append(", sex='").append(sex).append('\'');
sb.append('}');
return sb.toString();
}
}
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yml配置文件中的对象配置
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person:
name: Vigilr
age: 23
sex: 男
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调用方式，会用到@Autowired和@GetMapping("/person")
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@Autowired
private Person person;
@GetMapping("/person")
public String printPerson() {
return this.person.toString();
}
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请求方式
| 代码 |
说明 |
举例 |
@GetMapping("/url") |
get请求 |
@GetMapping("/user/{id}") |
@PostMapping("/url") |
post请求 |
@PostMapping("/user") |
@PutMapping("/url") |
put请求 |
@PutMapping("/user/{id}") |
Controller相关注解
@Controller
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@Controller
public class HelloController {
@GetMapping("/index")
public String printIndex() {
return "index";
}
}
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直接用可解析HTML
@ResponseBody
与@Controller配合使用
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@Controller
public class HelloController {
@GetMapping({"/hello", "hi"})
@ResponseBody
public String sayHello() {
return desc;
}
}
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@RestController
@RestController=@Controller+@ResponseBody
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@RestController
public class HelloController {
@GetMapping({"/hello", "hi"})
public String sayHello() {
return desc;
}
}
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获取参数
@PathVariable(“参数名”)
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@GetMapping("/user/{id}")
public UserEntity findId(@PathVariable("id") Integer id) {
return repository.findById(id).orElse(null);
}
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@RequestParam(“参数名”)
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@PostMapping("/user")
public UserEntity create(@RequestParam("age") Integer age,
@RequestParam("name") String name, @RequestParam("sex") String sex) {
UserEntity userEntity = new UserEntity();
userEntity.setAge(age);
userEntity.setName(name);
userEntity.setSex(sex);
return repository.save(userEntity);
}
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数据库相关
@Entity
表的定义
@Id
设置主键
@GeneratedValue
设置自增
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@Entity
public class UserEntity {
@Id
@GeneratedValue
private Integer id;
private String name;
private String sex;
private Integer age;
public UserEntity() {
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
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在IDEA中声明@Entity后，左侧会有数据库的标志
@Transactional
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@Transactional
public void createTwo() {
UserEntity userEntity1 = new UserEntity();
userEntity1.setAge(12);
userEntity1.setName("wasd");
userEntity1.setSex("sssss");
repository.save(userEntity1);
UserEntity userEntity2 = new UserEntity();
userEntity2.setAge(1314);
userEntity2.setName("zxcvbnm");
userEntity2.setSex("ddddddd");
repository.save(userEntity2);
}
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数据库表的引擎必须为INNODB才可进行事务管理
