Springboot PostMapping无法获取数据问题及解决（springboot项目实战）

目录PostMapping无法获取数据问题举例如下Springboot之PostMapping @PostMapping@RequestMapping

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

@Chttp://ontroller

@RequestMapping("/appointmentsIkIWDXis")

public class AppointmentsController {

private AppointmentBook appointmentBook;

@Autowired

public AppointmentsController(AppoinIkIWDXistmentBook appointmentBook) {

this.appointmentBook = appointmentBook;

}

@RequestMapping(method = RequestMethod.GET)

public Map get() {

return appointmentBook.getAppointmentsForToday();

}

@RequestMapping(value="/{day}", method = RequestMethod.GET)

public Map 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://ifeng.com/")

public void findPet(@PathVariable String ownerId, @PathVariable String petId, Model model) {

// implementation omitted

}

}

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