Springboot PostMapping无法获取数据问题及解决
时间：2023-02-23 09:10:20|栏目：JAVA代码|点击： 次
PostMapping无法获取数据问题
在使用SpringBoot的PostMapping注解的时候，发现无法获取数据（get方法可行），经过一番查证，发现需要添加新的注解
举例如下
//接受单个参数，使用RequestParam，并且添加上name属性，保证前后端的参数名称一致
@PostMapping(value = "/users")
public RestfulResponse postUser(@RequestParam("id") Integer id, @RequestParam("username") String username, @RequestParam("password") String password) {
User user = new User(id, username, password);
//User user = new User(1,"tom","123123");
System.out.println(id + "----" + username);
restfulResponse = new RestfulResponse(true,200,"查询成功", null);
return restfulResponse;
}
//接受一个实体类，要使用RequestBody 注解
@PostMapping(value = "/getuser")
public RestfulResponse postUser1(@RequestBody User user) {
restfulResponse = new RestfulResponse(true,200,"查询成功", user);
return restfulResponse;
}
Springboot之PostMapping
@PostMapping
映射一个POST请求
Spring MVC新特性
提供了对Restful风格的支持
@PostMapping(value = "/user/login") //等价于 @RequestMapping(value = "/user/login",method = RequestMethod.POST)
扩展
@GetMapping，处理get请求@PostMapping，处理post请求@PutMapping，处理put请求@DeleteMapping，处理delete请求
@RequestMapping
RequestMapping是一个用来处理请求地址映射的注解，可用于类或方法上。用于类上，表示类中的所有响应请求的方法都是以该地址作为父路径。
属性
value：指定请求的实际地址method：指定方法类型，get、post、put、delete等consumes：指定处理请求的提交内容类型，如application/json, text/html;produces: 指定返回的内容类型，仅当request请求头中的(Accept)类型中包含该指定类型才返回；params： 指定request中必须包含某些参数值是，才让该方法处理。headers： 指定request中必须包含某些指定的header值，才能让该方法处理请求。
value/method示例
@Controller
@RequestMapping("/appointments")
public class AppointmentsController {
private AppointmentBook appointmentBook;
@Autowired
public AppointmentsController(AppointmentBook appointmentBook) {
this.appointmentBook = appointmentBook;
}
@RequestMapping(method = RequestMethod.GET)
public Map<String, Appointment> get() {
return appointmentBook.getAppointmentsForToday();
}
@RequestMapping(value="/{day}", method = RequestMethod.GET)
public Map<String, Appointment> getForDay(@PathVariable @DateTimeFormat(iso=ISO.DATE) Date day, Model model) {
return appointmentBook.getAppointmentsForDay(day);
}
@RequestMapping(value="/new", method = RequestMethod.GET)
public AppointmentForm getNewForm() {
return new AppointmentForm();
}
@RequestMapping(method = RequestMethod.POST)
public String add(@Valid AppointmentForm appointment, BindingResult result) {
if (result.hasErrors()) {
return "appointments/new";
}
appointmentBook.addAppointment(appointment);
return "redirect:/appointments";
}
}
value的uri值为以下三类：
A） 可以指定为普通的具体值；
B) 可以指定为含有某变量的一类值(URI Template Patterns with Path Variables)；
C) 可以指定为含正则表达式的一类值( URI Template Patterns with Regular Expressions);
@RequestMapping(value="/owners/{ownerId}", method=RequestMethod.GET)
public String findOwner(@PathVariable String ownerId, Model model) {
Owner owner = ownerService.findOwner(ownerId);
model.addAttribute("owner", owner);
return "displayOwner";
}
@RequestMapping("/spring-web/{symbolicName:[a-z-]+}-{version:\d\.\d\.\d}.{extension:\.[a-z]}")
public void handle(@PathVariable String version, @PathVariable String extension) {
// ...
}
}
cousumes的样例：
@Controller
@RequestMapping(value = "/pets", method = RequestMethod.POST, consumes="application/json")
public void addPet(@RequestBody Pet pet, Model model) {
// implementation omitted
}
params的样例：
@Controller
@RequestMapping("/owners/{ownerId}")
public class RelativePathUriTemplateController {
@RequestMapping(value = "/pets/{petId}", method = RequestMethod.GET, params="myParam=myValue")
public void findPet(@PathVariable String ownerId, @PathVariable String petId, Model model) {
// implementation omitted
}
}
headers的样例：
@Controller
@RequestMapping("/owners/{ownerId}")
public class RelativePathUriTemplateController {
@RequestMapping(value = "/pets", method = RequestMethod.GET, headers="Referer=http://www.ifeng.com/")
public void findPet(@PathVariable String ownerId, @PathVariable String petId, Model model) {
// implementation omitted
}
}
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