用SSM形式编写抢答器的代码
时间: 2024-05-13 17:14:10 浏览: 22
抢答器的代码需要实现以下功能:
1. 创建题目列表,存储每个题目的答案和得分;
2. 开始抢答,记录每个抢答者的抢答时间和答案;
3. 判断抢答者的答案是否正确,如果正确则给予相应得分;
4. 记录每个抢答者的得分,按照得分从高到低排序;
5. 输出得分排名。
以下是使用 SSM 框架编写的抢答器代码:
1. 创建题目列表的实体类:
```java
public class Question {
private int id; // 题目编号
private String question; // 题目内容
private String answer; // 题目答案
private int score; // 题目分值
// 省略 getter 和 setter 方法
}
```
2. 开始抢答和记录抢答者答案的服务:
```java
@Service
public class AnswerService {
@Autowired
private QuestionMapper questionMapper;
// 记录每个抢答者的抢答时间和答案
private Map<String, String> answerMap = new HashMap<>();
public String start(String username) {
// 获取当前题目
Question question = questionMapper.getNextQuestion();
// 记录抢答者的抢答时间
answerMap.put(username, new Date().toString());
// 返回题目
return question.getQuestion();
}
public boolean answer(String username, String answer) {
// 判断答案是否正确
Question question = questionMapper.getCurrentQuestion();
if (question.getAnswer().equals(answer)) {
// 给予相应得分
int score = question.getScore();
questionMapper.addScore(username, score);
return true;
}
return false;
}
public Map<String, String> getAnswerMap() {
return answerMap;
}
}
```
3. 记录每个抢答者的得分和输出得分排名的服务:
```java
@Service
public class ScoreService {
@Autowired
private QuestionMapper questionMapper;
public List<Map.Entry<String, Integer>> getRanking() {
// 获取每个抢答者的得分
List<UserScore> userScores = questionMapper.getUserScores();
Map<String, Integer> scoreMap = new HashMap<>();
for (UserScore userScore : userScores) {
scoreMap.put(userScore.getUsername(), userScore.getScore());
}
// 按照得分从高到低排序
List<Map.Entry<String, Integer>> list = new ArrayList<>(scoreMap.entrySet());
list.sort((o1, o2) -> o2.getValue().compareTo(o1.getValue()));
return list;
}
}
```
4. 处理抢答请求的控制器:
```java
@Controller
public class AnswerController {
@Autowired
private AnswerService answerService;
@Autowired
private ScoreService scoreService;
@RequestMapping("/start")
public ModelAndView start(HttpServletRequest request) {
String username = request.getParameter("username");
String question = answerService.start(username);
ModelAndView mav = new ModelAndView("index");
mav.addObject("question", question);
return mav;
}
@RequestMapping("/answer")
@ResponseBody
public String answer(HttpServletRequest request) {
String username = request.getParameter("username");
String answer = request.getParameter("answer");
boolean isCorrect = answerService.answer(username, answer);
if (isCorrect) {
return "恭喜回答正确!";
} else {
return "回答错误,请继续努力!";
}
}
@RequestMapping("/ranking")
public ModelAndView ranking() {
List<Map.Entry<String, Integer>> list = scoreService.getRanking();
ModelAndView mav = new ModelAndView("ranking");
mav.addObject("list", list);
return mav;
}
}
```
5. 数据库操作的 Mapper 接口:
```java
public interface QuestionMapper {
@Select("SELECT * FROM question WHERE id = #{id}")
Question getQuestionById(int id);
@Select("SELECT * FROM question WHERE id > (SELECT MAX(question_id) FROM user_answer WHERE username = #{username}) LIMIT 1")
Question getNextQuestion(String username);
@Select("SELECT * FROM question WHERE id = (SELECT MAX(question_id) FROM user_answer WHERE username = #{username})")
Question getCurrentQuestion(String username);
@Insert("INSERT INTO user_answer (username, question_id, answer) VALUES (#{username}, #{questionId}, #{answer})")
void addUserAnswer(@Param("username") String username, @Param("questionId") int questionId, @Param("answer") String answer);
@Select("SELECT username, SUM(score) AS score FROM user_score GROUP BY username")
List<UserScore> getUserScores();
@Insert("INSERT INTO user_score (username, score) VALUES (#{username}, #{score}) ON DUPLICATE KEY UPDATE score = score + #{score}")
void addScore(@Param("username") String username, @Param("score") int score);
}
```
以上是使用 SSM 框架编写的抢答器代码,可以根据具体需求进行修改和优化。
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