Question

我有两个POJO课程。

第1类是 Engine.java ：

private String engineId;

public String getEngineId(){
  return this.engineId;
}   

public void setEngineId(String engineId){
  this.engineId = engineId;
}

第二个POJO类是 Vehicle.java ：

private String type;
private String manufacturer;
private Engine engine;

public String getType() {
   return type;
} 

public void setType(String type) {
    this.type = type;
} 

public String getManufacturer() {
     return manufacturer;
} 

public void setManufacturer(String manufacturer) {
     this.manufacturer = manufacturer;
}  

public Engine getEngine() {
     return engine;
} 

public void setEngine(Engine engine) {
    this.engine = engine;
}

我有一个REST控制器，用于提供Vechicles（RequestMethod.GET）的信息：

@RequestMapping(method = RequestMethod.GET)
public Vehicle getVechileDetails(Vehicle inputVehicle){
   Vehicle vehicle = new Vehicle();
    // some processing
    return vehicle;
}

当我点击此服务并提供Request参数作为类型或制造商时，Spring会创建Vehicle对象并填充类型和制造商的值。但是如果我提供engineId的值，那么Spring就无法创建引擎对象vehicle.getEngine().getEngineId() != null

如果我调用我的Rest Service，有没有办法如下：

http://localhost:8080/Controller/getVehicleDetails?engineId=12345

然后使用引擎创建Vehicle，其值为engineId？

Answer 1

您可以像这样获得vehicleId（包含ResponseEntity结构）：

    @RequestMapping(value = "/Controller/getVehicleDetails", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)
    public
    @ResponseBody
    ResponseEntity<AjaxResponse> controller(@RequestParam(value = "engineId") Long engineId) {
        //Do whatever you want with the engineId
        return new ResponseEntity<AjaxResponse>(new AjaxResponse("Success"), HttpStatus.OK);
    }

但是，对于POJO，我必须警告两件事：

确保您的课程实施Serializable
对于从Java转换为Javascript时不确定的字段，反之亦然，如Date变量，您必须正确设置JsonSerializer类

更新：您希望从请求中获取对象，因此：

    @RequestMapping(value = "/Controller/getVehicleDetails", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE, , consumes = MediaType.APPLICATION_JSON_VALUE)
    public
    @ResponseBody
    ResponseEntity<AjaxResponse> controller(@RequestBody Vehicle vehicle) {
        //vehicle.getEngine().getEngineId()
        return new ResponseEntity<AjaxResponse>(new AjaxResponse("Success"), HttpStatus.OK);
    }

POJO。：

    public class Engine implements Serializable {
        //...
    }

    public class Vehicle implements Serializable {
        private Engine engine;
    }

JS方面：

    var vehicle = {
        engine: {id: 123}//,
        //...
    }
    //via angularjs:
    $http.post("http://localhost:8080/Controller/getVehicleDetails", vehicle).success(function(response) {
        console.log("success");
    });

Answer 2

在这里你可以参考，请求体具有转换为Object的JSON 请参阅：For references

@RequestMapping(value = EmpRestURIConstants.CREATE_EMP, method = RequestMethod.POST)
    public @ResponseBody Employee createEmployee(@RequestBody Employee emp) {
        logger.info("Start createEmployee.");
        emp.setCreatedDate(new Date());
        empData.put(emp.getId(), emp);
        return emp;
    }

将请求参数转换为Class对象

2 个答案: