解决Springboot PostMapping无法获取数据的问题

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

@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
  }
}