HTTP状态400 - 必需字符串参数'walletName'不存在

Question

我使用Java/ Spring MVC RESTfulapp并400 HTTP status error在执行POST请求时获取.@RestController提供了该方法,

@RequestMapping(value = "/generateAddress", method = RequestMethod.POST)
    public ResponseEntity<WalletInfoWrapper> generateAddress(@RequestParam("walletName") String walletName,
                                                             @RequestParam("currencyName") String currencyName) {

        logger.info("walletName {} and currencyName {}", walletName, currencyName);

        // return if the wallet name or the currency is null
        if (Objects.isNull(walletName) || Objects.isNull(currencyName)) {
            return new ResponseEntity<WalletInfoWrapper>(HttpStatus.NOT_ACCEPTABLE);
        }

        WalletInfo walletInfo = walletService.generateAddress(walletName, currencyName);

        if (Objects.isNull(walletInfo)) {
            return new ResponseEntity<WalletInfoWrapper>(HttpStatus.NOT_ACCEPTABLE);
        }

        WalletInfoWrapper walletInfoWrapper = new WalletInfoWrapper();
        walletInfoWrapper.setName(walletInfo.getName());

        return new ResponseEntity<WalletInfoWrapper>(walletInfoWrapper, HttpStatus.CREATED);
    }

所述POST请求中的Postman下方,

错误消息通知, Required String parameter 'walletName' is not present

我还可以为观察下拉操作services的dataase层和层提供代码.这是什么问题？

UPDATE

我更新了Postman这样的请求,仍然有同样的错误,

UPDATE 1

我还有同样的问题,

我POST有数据,

{"walletName":"puut","currencyName":"Bitcoin"}

代码如下,

@RequestMapping(value = "/generateAddress", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<WalletInfoWrapper> generateAddress(@RequestBody WalletWithMoneyRequest walletWithMoneyRequest) {

        String walletName = walletWithMoneyRequest.getWalletName();

        String currencyName = walletWithMoneyRequest.getCurrencyName();

        logger.info("walletName {} and currencyName {}", walletName, currencyName);

        // return if the wallet name or the currency is null
        if (Objects.isNull(walletName) || Objects.isNull(currencyName)) {
            return new ResponseEntity<WalletInfoWrapper>(HttpStatus.NOT_ACCEPTABLE);
        }

        WalletInfo walletInfo = walletService.generateAddress(walletName, currencyName);

        if (Objects.isNull(walletInfo)) {
            return new ResponseEntity<WalletInfoWrapper>(HttpStatus.NOT_ACCEPTABLE);
        }

        WalletInfoWrapper walletInfoWrapper = new WalletInfoWrapper();
        walletInfoWrapper.setName(walletInfo.getName());

        return new ResponseEntity<WalletInfoWrapper>(walletInfoWrapper, HttpStatus.CREATED);
    }

该POJO提供,

private class WalletWithMoneyRequest {

        String walletName;

        String currencyName;

        public WalletWithMoneyRequest(String walletName, String currencyName) {
            this.walletName = walletName;
            this.currencyName = currencyName;
        }

        public WalletWithMoneyRequest() {
        }

        public String getWalletName() {
            return walletName;
        }

        public String getCurrencyName() {
            return currencyName;
        }

        public void setCurrencyName(String currencyName) {
            this.currencyName = currencyName;
        }

        public void setWalletName(String walletName) {
            this.walletName = walletName;
        }
    }

这是错误消息,

这里是Tomcat服务器信息,

org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver: 08/19/2017 19:45:55 - Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot construct instance of `mobi.puut.controllers.WalletRestController$WalletWithMoneyRequest` (although at least one Creator exists): can only instantiate non-static inner class by using default, no-argument constructor; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `mobi.puut.controllers.WalletRestController$WalletWithMoneyRequest` (although at least one Creator exists): can only instantiate non-static inner class by using default, no-argument constructor
 at [Source: (PushbackInputStream); line: 1, column: 2]

Tomcat Localhost log

Tomcat Catalina log

Answer 1

您的控制器需要 2 个请求参数，通常如下所示：/someurl?walletName=my-wallets-name¤cyName=dollars。

您在帖子正文中发送 json 字符串，但没有形式参数。您需要更新您的 POST 或控制器以使两端一致。我认为您可能想用一个具有两个字符串成员的 Java pojo 替换两个 @RequestParam 注释的字符串：walletName 和currencyName，将该 pojo 作为参数放入您的请求方法中，并在其前面添加注释 @RequestBody。这将与您的 json 帖子匹配。

要让您的控制器接受正文中包含 JSON 的帖子，请像这样编辑它：

@RequestMapping(value = "/generateAddress", method = RequestMethod.POST)
public ResponseEntity<WalletInfoWrapper> generateAddress(@RequestBody
    WalletWithMoneyRequest myJsonRequestComingIn) {
    logger.info("walletName {} and currencyName {}", myJsonRequestComingIn.getWalletName(), myJsonRequestComingIn.getCurrencyName());

还有你的波乔

public class WalletWithMoneyRequest{ 

    private String walletName;
    private String currencyName;

    //getters and setters down here.