如何在springboot中構建微服務GET api，它可以將單個或多個參數作為插入請求url並作為請求獲取數據

Question

GET/data/search? 將返回所有記錄

GET/data/search?name=jhon&add=US將根據請求返回特定記錄

GET/data/search? Amount=100 GET/data/search? Amount=100將返回特定於金額 100 的所有記錄

客戶可以根據自己的要求，隨時輸入全部或部分參數。

任何指向參考代碼的鏈接也可以

下面是我的錯誤和實現

我的 repo 方法沒有被調用，它正在調用 service 方法並打印 controller 和 service 但不是 repo 的 sysout，這意味着它沒有調用 repo 下面是 consol output: Request param received (sysout)

內部服務方法（sysout）

2019-10-15 13:54:30,185 錯誤 [http-nio-8080-exec-1] org.apache.juli.logging.DirectJDKLog: Servlet.service() for servlet [dispatcherServlet] 在上下文中與路徑 [] 引發異常[請求處理失敗； 嵌套異常是 java.lang.NullPointerException] 根本原因 java.lang.NullPointerException: null

@RestController
public class MobileController {


@GetMapping(value="/mobile/search")
public List<MobileResponse> getMobile(@RequestParam Map<String, String> 
 map) {
    MobileService mobileService =new MobileService();
    System.out.println("Request param received");
    map.forEach((k,v)->System.out.println(k+":"+v));
    List<MobileResponse> mobiles = mobileService.getAllMobiles(map);
    mobiles.forEach(mobile-> System.out.println(mobile));
    return mobiles;
 }
 }

服務

       @Service
       public class MobileService {


  public List<MobileResponse> getAllMobiles(Map<String, String> map) {

    List<MobileResponse> mobilResponseList = new ArrayList<>();
    System.out.println("Inside service method");
     MobileRepoIntf repo=null;
    mobilResponseList  = repo.findAllMobiles(map);
    return mobilResponseList;
 }
 }

回購接口

 @Repository
 public interface MobileRepoIntf{


List<MobileResponse> findAllMobiles(Map<String, String> map);

 }

回購實施

public class MobileRepository implements MobileRepoIntf {

@PersistenceContext
private EntityManager em;

@SuppressWarnings("uncheaked")

@Override
public List<MobileResponse> findAllMobiles(Map<String, String> map) {
    System.out.println("inside Repo method ");
    String query = "select m.id,h.id, r.id from 
 com.axiomtelecom.assignment.entities.Mobile m, 
com.axiomtelecom.assignment.entities.Hardware 
h,com.axiomtelecom.assignment.entities.Releases r where m.hardware_id = 
h.id AND m.releases_id = r.id";
    List<MobileResponse> mobileList = new ArrayList();
    Query qry = em.createQuery(query);
    System.out.println("Query is "+qry);
    return qry.getResultList();
  }

 }

移動實體

@Entity
@Table(name = "MOBILE")
public class Mobile implements Serializable {

//Logger logger = (Logger) LoggerFactory.getLogger(Mobile.class);

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;

@Column(name = "brand")
private String brand;

@Column(name = "phone")
private String phone;

@Column(name = "picture")
private String picture;

@Column(name = "sim")
private String sim;

@Column(name = "resolution")
private String resolution;


//@OneToOne(cascade = CascadeType.ALL)
@OneToOne
@JoinColumn(name ="id")
private Hardware hardware;

@OneToOne
@JoinColumn(name="id")
private Releases releases;

//followed by setter and getter methods
}

硬件實體

@Entity
@Table(name="Hardware")
public class Hardware implements Serializable {

//Logger logger = (Logger) LoggerFactory.getLogger(Hardware.class);

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;

@Column(name="audioJacks")
private String audioJacks;

@Column(name = "gps")
private String gps;


@Column(name = "battery")
private String battery;

//followed by setter and getter methods
}

發布實體

@Entity
@Table(name="Releases")
public class Releases implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;

@Column(name="priceEuro")
private long priceEuro;

@Column(name="announceDate")
private String announceDate;

//followed by setter and getter methods
}

data.sql 文件

enter code here

drop table if exists Hardware;
CREATE table  Hardware (
    id INT AUTO_INCREMENT  PRIMARY KEY,
    audioJacks varchar(200),
    gps varchar(100),
    battery varchar(200),
);


drop table if exists Releases;
create table If Not exists Releases (
    id INT AUTO_INCREMENT  PRIMARY KEY,
    priceEuro int,
    announceDate varchar(100),
);

drop table if exists Mobile;
CREATE TABLE If Not exists   Mobile (
id INT AUTO_INCREMENT  PRIMARY KEY,
 brand VARCHAR(250),
phone VARCHAR(250),
picture VARCHAR(250),
sim VARCHAR(250),
resolution VARCHAR(250),
hardware_id int references Hardware(id),
releases_id int references Releases(id)
  );

 //followed by insert query first for releases,hardware and then for mobile 
 data is inserted as expected in db.

Answer 1

它應該是這樣的：

@GetMapping("/data/search")
public YourObject getData(@RequestParam(value = "name", required = false) String name, 
                          @RequestParam(value = "amount", required = false) Integer amount){
                          ...
                          }

Answer 2

有多種方法可以實現它。

您可以將每個查詢參數作為方法參數接收：

@GetMapping("/foo")
public ResponseEntity<Foo> getFoo(@RequestParam(value = "name", required = false) String name,
                                  @RequestParam(value = "amount", required = false) Integer amount) {
    ...
}

您可以將所有參數作為Map<String, String>接收：

@GetMapping("/foo")
public ResponseEntity<Foo> getFoo(@RequestParam Map<String, String> parameters) {   
    ...
}

或者您可以定義一個 class 來表示參數並接收它的實例作為方法參數：

@Data
public class FooQueryParameters {
    private String name;
    private Integer amount;
}

@GetMapping("/foo")
public ResponseEntity<Foo> getFoo(FooQueryParameters parameters) {   
    ...
}