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Денис Короленко's questions

Martin Hope
Денис Короленко
Asked: 2022-07-04 20:51:30 +0000 UTC
  • 0

应用程序找不到与表单上指定的属性匹配的对象。我是新来的。我会很感激！

控制器：

    @GetMapping("/ads/{id}/edit")
public String adEdit(@PathVariable(value = "id") int id, Model model) {
    List<Platform> platforms = platformRepository.findAll();
    Ad ad = adRepository.findById(id).orElseThrow(() ->
            new ResponseStatusException(HttpStatus.NOT_FOUND,
                    "Ad having id " + id + " not found"));
    model.addAttribute("platforms", platforms);
    model.addAttribute("ad",ad);
    return "ad-edit";
}

@PostMapping("/ads/{id}/edit")
public String adUpdate(@PathVariable(value = "id") int id, @RequestBody AdDTO adDto,
                       Model model) {
    Ad ad = adRepository.findById(id).orElseThrow(() ->
            new ResponseStatusException(HttpStatus.NOT_FOUND,
                    "Ad having id " + id + " not found"));
    ad.setPlatforms((platformRepository.findAllById(adDto.platformsIds)));
    ad.setName(adDto.getName());
    ad.setAssetUrl(adDto.getAssetUrl());
    adRepository.save(ad);
    return "redirect:/ads";
}

ATT：

public class AdDTO {
public int id;
public String name;
public String assetUrl;
public Status status;
public Campaign campaign;
public Set<Integer> platformsIds;

HTML：

<!DOCTYPE html>
<html>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet"
      integrity="sha384-+0n0xVW2eSR5OomGNYDnhzAbDsOXxcvSN1TPprVMTNDbiYZCxYbOOl7+AMvyTG2x" crossorigin="anonymous">
<link rel="stylesheet" href="/css/style.css"/>
<head>
    <meta charset="UTF-8">
    <title>Редактирование обьявления</title>
</head>
<body>
<header>
    <nav class="navbar navbar-light bg-light">
        <form class="container justify-content-start">
            <h3 class="caption">Редактирование обьявления <span th:text="${ad.name}"></span></h3>
            <button class="navbar-toggler" type="button">
                <a href="../home.html" th:href="@{/home}">На главную</a></button>
            <button type="button" class="btn btn-light">
                <a href="../info.html" th:href="@{/info}">Обе SQL Таблицы</a></button>
            <button type="button" class="btn btn-light">
                <a href="../ads.html" th:href="@{/ads}">Обьявления</a></button>
            <button type="button" class="btn btn-light">
                <a class="link" href="../campaigns.html" th:href="@{/campaigns}">Кампании</a></button>
        </form>
    </nav>
</header>
<!--<div th:object="${adDto}"  class="container justify-content-start">-->
    <form th:object="${adDto}" th:action="@{/ads/{id}/edit}" method="post">
        <input type="text" th:value="${ad.name}" th:field="*{adDto.name}"

               placeholder="Введите название обьявления" class="form-control">

        <input type="text" th:value="${ad.assetUrl}" th:field="*{adDto.assetUrl}"

               placeholder="Введите ссылку на рекламу" class="form-control">
        <!--        <h6>id кампании </h6> <h6 th:value="${el.campaign.id}"></h6>-->
        <select class="form-control" th:field="*{adDto.platformsIds}" multiple="multiple">
            <div> <option th:each="platform : ${platforms}"
                    th:value="${platform.id}"
                    th:text="${platform.name}"
                    th:selected="${adDto.platformsIds.contains(platform.id)}">
            </option> </div>
        </select>
        <button type="submit" class="btn btn-success">Редактировать</button>
    </form>
<!--</div>-->
</body>
</html>

在此处输入图像描述

spring-mvc
Martin Hope
Денис Короленко
Asked: 2020-01-11 00:05:50 +0000 UTC
  • 0

有一个方法：

public void ShowRacingResults(String folderPath) {
    Map<String, String> abbreviationsMap = ConvertFileToMap(folderPath + "/abbreviations.txt");
    Map<String, String> resultMap = CalculateResults(folderPath);
    int place = 1;
    for (String s : resultMap.keySet())
        for (String k : abbreviationsMap.keySet())
            if (s.equals(k)) {
                System.out.println(place + ". " + abbreviationsMap.get(k).split("_")[0] + " | "
                        + abbreviationsMap.get(k).split("_")[1] + " | " + resultMap.get(s));
                place++;
            } else if (s.equals(k) & place == 16) {
                System.out.println("------------------------------------------------------------------------"
                        + "\n" + place + ". " + abbreviationsMap.get(k).split("_")[1] + " | "
                        + abbreviationsMap.get(k).split("_")[2] + " | " + resultMap.get(s));
                place++;
            }
}

最终将结果输出为：

  1. 瓦尔特利·博塔斯 | 梅赛德斯| 1:12.434
  2. 塞巴斯蒂安·维特尔 | 法拉利 | 1:04.415
  3. 卡洛斯·塞恩斯 | 雷诺 | 1:12.950
  4. 丹尼尔·里卡多 | 红牛赛车 TAG HEUER | 1:12.013
  5. 凯文马格努森 | 哈斯法拉利 | 1:13.393
  6. 塞尔吉奥佩雷斯 | FORCE INDIA MERCEDES | 1:12.848
  7. 斯托菲尔·范多恩 | 迈凯轮雷诺 | 1:12.463
  8. 查尔斯·勒克莱尔 | 索伯法拉利 | 1:12.829
  9. 布兰登哈特利 | SCUDERIA TORO ROSSO HONDA | 1:13.179
  10. 刘易斯·汉密尔顿 | 梅赛德斯| 1:12.460
  11. 兰斯漫步 | 威廉姆斯奔驰 | 1:13.323
  12. 罗曼·格罗斯让 | 哈斯法拉利 | 1:12.930
  13. 费尔南多·阿隆索 | 迈凯轮雷诺 | 1:12.657
  14. 谢尔盖·西罗特金 | 威廉姆斯奔驰 | 1:12.706
  15. 尼科·霍肯伯格 | 雷诺 | 1:13.065
  16. 马库斯·爱立信 | 索伯法拉利 | 1:13.265
  17. 埃斯特班奥康 | FORCE INDIA MERCEDES | 1:13.028
  18. 皮埃尔·加斯利 | SCUDERIA TORO ROSSO HONDA | 1:12.941
  19. 基米莱科宁 | 法拉利 | 1:12.639

请告诉我如何使用排序时间输出结果，如下所示：

需要“|” 在每条线上都处于同一水平，并且在第 15 名骑手之后有一个分隔的“----”

java
Martin Hope
Денис Короленко
Asked: 2020-09-09 22:37:22 +0000 UTC
  • 0

应用程序进行长除法并将整个过程打印到控制台。一切正常，测试通过，问题是当测试运行时，它会抛出 NullPointerException。我不明白在哪里以及如何处理它。NPE 在测试代码的倒数第二行弹出（String actual = subject.divide(256, 8);）。这是NPE：

`java.lang.NullPointerException
`at DivisionServiceTest.divide(DivisionServiceTest.java:30)
`at java.base/java.util.ArrayList.forEach(ArrayList.java:1380)
`at java.base/java.util.ArrayList.forEach(ArrayList.java:1380)

这是代码：

public class Division implements DivisionService {

private StringBuilder result = new StringBuilder();
private StringBuilder quotient = new StringBuilder();
private StringBuilder reminder = new StringBuilder();

public String divide(long dividend, long divider) throws IllegalArgumentException {

    if (divider == 0) {
        return "Divider cannot be 0, division by zero";
    }

    long absDividend = Math.abs(dividend);
    long absDivider = Math.abs(divider);

    if (absDividend < absDivider) {
        return "Dividend less than divider. Column Division isn't possible";
    }

    String[] dividentAsArray = String.valueOf(absDividend).split("");

    Integer reminderAsDigit;
    long multiplyResult;

    Integer dividerDigit = calculateDigit(absDivider);
    long mod;

    for (int i = 0; i < dividentAsArray.length; i++) {
        reminder.append(dividentAsArray[i]);
        reminderAsDigit = Integer.parseInt(reminder.toString());

        if (reminderAsDigit >= absDivider) {
            mod = reminderAsDigit % absDivider;
            multiplyResult = reminderAsDigit / absDivider * absDivider;

            String lastReminder = String.format("%" + (i + 2) + "s", "_" + reminderAsDigit.toString());
            result.append(lastReminder).append("\n");

            String multiply = String.format("%" + (i + 2) + "d", multiplyResult);
            result.append(multiply).append("\n");

            Integer tab = lastReminder.length() - calculateDigit(multiplyResult);
            result.append(makeDivider(reminderAsDigit, tab)).append("\n");

            quotient.append(reminderAsDigit / absDivider);

            reminder.replace(0, reminder.length(), Long.toString(mod));
            reminderAsDigit = Integer.parseInt(reminder.toString());
        } else {
            if (i >= dividerDigit) {
                quotient.append(0);
            }
        }

        if (i == dividentAsArray.length - 1) {
            result.append(String.format("%" + (i + 2) + "s", reminderAsDigit.toString())).append("\n");
        }
    }

    modifyResultToView(absDividend, absDivider);

    if (dividend > 0 && divider < 0) {
        result.insert(0, "-");
        return result.toString();
    }
    if (dividend < 0 && divider > 0) {
        result.insert(0, "-");
        return result.toString();
    } else return result.toString();
}

private String makeDivider(Integer reminderNumber, Integer tab) {
    return assemblyString(tab, ' ') + assemblyString(calculateDigit(reminderNumber), '-');
}

private void modifyResultToView(long dividend, long divider) {
    int[] index = new int[3];
    for (int i = 0, j = 0; i < result.length(); i++) {
        if (result.charAt(i) == '\n') {
            index[j] = i;
            j++;
        }

        if (j == 3) {
            break;
        }
    }

    int tab = calculateDigit(dividend) + 1 - index[0];
    result.insert(index[2], assemblyString(tab, ' ') + "│" + quotient.toString());
    result.insert(index[1], assemblyString(tab, ' ') + "│" + assemblyString(quotient.length(), '-'));
    result.insert(index[0], "│" + divider);
    result.replace(1, index[0], Long.toString(dividend));
}

private int calculateDigit(long i) {
    return (int) Math.log10(i) + 1;
}

private String assemblyString(int numberOfSymbols, char symbol) {
    StringBuilder string = new StringBuilder();
    for (int i = 0; i < numberOfSymbols; i++) {
        string.append(symbol);
    }
    return string.toString();
}
}

这是测试：

import org.junit.Before;
import org.junit.jupiter.api.Test;

import static org.junit.Assert.assertEquals;

public class DivisionServiceTest {`введите сюда код`

private DivisionService subject;

@Before
public void initSubject() throws Exception {
    subject = new Division();
}

@Test
public void divide() {

        /* Given */
        String expected =
                " 256 | 8\n" +
                        "-    |---\n" +
                        " 24  | 32\n" +
                        " --\n" +
                        " _16\n" +
                        "  16\n" +
                        "  --\n" +
                        "   0\n";

        /* When */
        String actual = subject.divide(256, 8);

        /* Then */
        assertEquals(expected, actual);
}
}
java