消费第三方RESTful API传递参数

Question

我需要使用第三方RESTful API。 这是我的控制器类：

@Controller
public class BrokerController {

    @RequestMapping(value = "/broker", method = RequestMethod.POST)
    public @ResponseBody MyPojo brokers(@RequestBody BrokerRequest brokerRequest){

        RestTemplate restTemplate = new RestTemplate();
        final String uri = "http://www.nepalipaisa.com/Modules/MarketMovers/Services/MarketMoversServices.asmx/GetTopBrokers";

        MyPojo myPojo = restTemplate.postForObject(uri,brokerRequest,MyPojo.class);
        return myPojo;
    }

}

编辑：-我的pojo课：

public class MyPojo {
private String __type;
private Integer RowTotal;
private Integer StockID;
private Object CodedCompany;
private Object ClosingPrice;
private Integer Amount;
private Integer PreviousClosing;
private Integer DifferenceRS;
private Object Symbol;
private Integer Price;
private Integer Diff;
private Integer PercentageDiff;
private Object Volume;
private Integer TotalTurnOverAmount;
private String FirmName;
private Integer BrokerID;
private String BrokerCode;
private Integer TotalTransactions;
private Object Traded;
private Object MaxPrice;
private Object MinPrice;
private Object OpeningPrice;
private Object TotalShare;
private Integer NoOfTransaction;
private Integer Purchase;
private Integer Sales;
private Integer Matching;


public String get__type() {
    return __type;
}

public void set__type(String __type) {
    this.__type = __type;
}

public Integer getRowTotal() {
    return RowTotal;
}

public void setRowTotal(Integer rowTotal) {
    this.RowTotal = rowTotal;
}

public Integer getStockID() {
    return StockID;
}

public void setStockID(Integer stockID) {
    this.StockID = stockID;
}

public Object getCodedCompany() {
    return CodedCompany;
}

public void setCodedCompany(Object codedCompany) {
    this.CodedCompany = codedCompany;
}

public Object getClosingPrice() {
    return ClosingPrice;
}

public void setClosingPrice(Object closingPrice) {
    this.ClosingPrice = closingPrice;
}

public Integer getAmount() {
    return Amount;
}

public void setAmount(Integer amount) {
    this.Amount = amount;
}

public Integer getPreviousClosing() {
    return PreviousClosing;
}

public void setPreviousClosing(Integer previousClosing) {
    this.PreviousClosing = previousClosing;
}

public Integer getDifferenceRS() {
    return DifferenceRS;
}

public void setDifferenceRS(Integer differenceRS) {
    this.DifferenceRS = differenceRS;
}

public Object getSymbol() {
    return Symbol;
}

public void setSymbol(Object symbol) {
    this.Symbol = symbol;
}

public Integer getPrice() {
    return Price;
}

public void setPrice(Integer price) {
    this.Price = price;
}

public Integer getDiff() {
    return Diff;
}

public void setDiff(Integer diff) {
    this.Diff = diff;
}

public Integer getPercentageDiff() {
    return PercentageDiff;
}

public void setPercentageDiff(Integer percentageDiff) {
    this.PercentageDiff = percentageDiff;
}

public Object getVolume() {
    return Volume;
}

public void setVolume(Object volume) {
    this.Volume = volume;
}

public Integer getTotalTurnOverAmount() {
    return TotalTurnOverAmount;
}

public void setTotalTurnOverAmount(Integer totalTurnOverAmount) {
    this.TotalTurnOverAmount = totalTurnOverAmount;
}

public String getFirmName() {
    return FirmName;
}

public void setFirmName(String firmName) {
    this.FirmName = firmName;
}

public Integer getBrokerID() {
    return BrokerID;
}

public void setBrokerID(Integer brokerID) {
    this.BrokerID = brokerID;
}

public String getBrokerCode() {
    return BrokerCode;
}

public void setBrokerCode(String brokerCode) {
    this.BrokerCode = brokerCode;
}

public Integer getTotalTransactions() {
    return TotalTransactions;
}

public void setTotalTransactions(Integer totalTransactions) {
    this.TotalTransactions = totalTransactions;
}

public Object getTraded() {
    return Traded;
}

public void setTraded(Object traded) {
    this.Traded = traded;
}

public Object getMaxPrice() {
    return MaxPrice;
}

public void setMaxPrice(Object maxPrice) {
    this.MaxPrice = maxPrice;
}

public Object getMinPrice() {
    return MinPrice;
}

public void setMinPrice(Object minPrice) {
    this.MinPrice = minPrice;
}

public Object getOpeningPrice() {
    return OpeningPrice;
}

public void setOpeningPrice(Object openingPrice) {
    this.OpeningPrice = openingPrice;
}

public Object getTotalShare() {
    return TotalShare;
}

public void setTotalShare(Object totalShare) {
    this.TotalShare = totalShare;
}

public Integer getNoOfTransaction() {
    return NoOfTransaction;
}

public void setNoOfTransaction(Integer noOfTransaction) {
    this.NoOfTransaction = noOfTransaction;
}

public Integer getPurchase() {
    return Purchase;
}

public void setPurchase(Integer purchase) {
    this.Purchase = purchase;
}

public Integer getSales() {
    return Sales;
}

public void setSales(Integer sales) {
    this.Sales = sales;
}

public Integer getMatching() {
    return Matching;
}

public void setMatching(Integer matching) {
    this.Matching = matching;
}
}

我需要使用JSON iI，即下面给出的确切结果：

{
"d": [
    {
        "__type": "SageFrame.MarketMovers.MarketInfo",
        "RowTotal": 0,
        "StockID": 0,
        "CodedCompany": null,
        "ClosingPrice": null,
        "Amount": 0,
        "PreviousClosing": 0,
        "DifferenceRS": 0,
        "Symbol": null,
        "Price": 0,
        "Diff": 0,
        "PercentageDiff": 0,
        "Volume": null,
        "TotalTurnOverAmount": 109969058,
        "FirmName": "Vision Securities Pvt. Ltd.",
        "BrokerID": 0,
        "BrokerCode": "34",
        "TotalTransactions": 0,
        "Traded": null,
        "MaxPrice": null,
        "MinPrice": null,
        "OpeningPrice": null,
        "TotalShare": null,
        "NoOfTransaction": 0,
        "Purchase": 70691939,
        "Sales": 39277119,
        "Matching": 6381555
    },
    {
        "__type": "SageFrame.MarketMovers.MarketInfo",
        "RowTotal": 0,
        "StockID": 0,
        "CodedCompany": null,
        "ClosingPrice": null,
        "Amount": 0,
        "PreviousClosing": 0,
        "DifferenceRS": 0,
        "Symbol": null,
        "Price": 0,
        "Diff": 0,
        "PercentageDiff": 0,
        "Volume": null,
        "TotalTurnOverAmount": 104830489,
        "FirmName": "Online Securities Pvt. Ltd.",
        "BrokerID": 0,
        "BrokerCode": "49",
        "TotalTransactions": 0,
        "Traded": null,
        "MaxPrice": null,
        "MinPrice": null,
        "OpeningPrice": null,
        "TotalShare": null,
        "NoOfTransaction": 0,
        "Purchase": 51927902,
        "Sales": 52902587,
        "Matching": 3049044
    }
]
}

当前，当我发送带有两个参数的POST请求时

{
    "offset":"1",
    "limit":"2000"
}

我可以得到上面给出的结果。 现在，我需要通过自己的控制器返回相同的结果。 上面的控制器返回MyPojo类，其中每个属性的值为null 。

Answer 1

您始终可以尝试将第三方API的结果放入地图中。

Map results = restTemplate.postForObject(uri,brokerRequest, Map.class);

或者，您可以仅为该第三方API创建一个新的pojo。

ThirdPartyPojo results = restTemplate.postForObject(uri,brokerRequest, ThirdPartyPojo.class);

Answer 2

---

这甚至可以轻松实现，甚至不需要您提供自定义映射或类似的内容，并保证您的控制器将提供相同的响应（尽管不是相同的标头）：

@RestController
final class Controller {

    // Both RestTemplate and URI instances can be cached
    private static final RestTemplate restTemplate = new RestTemplate();
    private static final URI testUri = URI.create("http://www.nepalipaisa.com/Modules/MarketMovers/Services/MarketMoversServices.asmx/GetTopBrokers");

    // I'm using GET just to simplify the testing using a web browser
    @RequestMapping(method = GET, value = "/")
    public void post(final ServletResponse response)
            throws IOException {
        // Create a POST request entity
        final RequestEntity<?> requestEntity = new RequestEntity<>(getRequest(0, 10), POST, testUri);
        // And send the request to the remote server
        final ResponseEntity<Resource> responseEntity = restTemplate.exchange(requestEntity, Resource.class);
        // Now just copy the response input stream to the output stream of this controller
        try ( final InputStream inputStream = responseEntity.getBody().getInputStream() ) {
            // Or provide HttpServletResponse via the controller method to be able to configure the response more accurately
            StreamUtils.copy(inputStream, response.getOutputStream());
        }
    }

    private static Object getRequest(final long offset, final long limit) {
        final Map<String, Object> request = new HashMap<>();
        request.put("offset", offset);
        request.put("limit", limit);
        return request;
    }

}

远程服务器可以使用不成功的响应代码进行响应，因此您还可以使用自定义控制器建议来处理RestTemplate异常：

@ControllerAdvice
final class ExceptionControllerAdvice {

    @ExceptionHandler(HttpServerErrorException.class)
    @ResponseBody
    public ResponseEntity<?> handleHttpServerErrorException(final HttpServerErrorException ex) {
        return new ResponseEntity<Object>("Bad gateway: " + ex.getMessage(), BAD_GATEWAY);
    }

}

Answer 3

现在的问题是您的pojo MyPojo与第三方API的响应不兼容。

您的pojo应该如下所示。

----------------------------------- com.example.D.java -------- ---------------------------

package com.example;

import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

public class D {

private String type;
private Integer rowTotal;
private Integer stockID;
private Object codedCompany;
private Object closingPrice;
private Integer amount;
private Integer previousClosing;
private Integer differenceRS;
private Object symbol;
private Integer price;
private Integer diff;
private Integer percentageDiff;
private Object volume;
private Integer totalTurnOverAmount;
private String firmName;
private Integer brokerID;
private String brokerCode;
private Integer totalTransactions;
private Object traded;
private Object maxPrice;
private Object minPrice;
private Object openingPrice;
private Object totalShare;
private Integer noOfTransaction;
private Integer purchase;
private Integer sales;
private Integer matching;

// Getter .. Setter//
}

----------------------------------- com.example.MyPojo.java -------- ---------------------------

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonAnySetter;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

public class Example {

@JsonProperty("d")
private List<D> d = null;

// Getter ... Setter
}

或者只是您可以使用地图。