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Springboot thymeleaf를 사용하여 두 개의 숫자를 추가하는 방법

기록만이살길 2021. 2. 25. 23:09
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Springboot thymeleaf를 사용하여 두 개의 숫자를 추가하는 방법

1. 질문(문제점):

나는 스프링 부트 타임 리프 형태의 초보자입니다. 합계를 계산하고 표시하기 위해 두 개의 숫자를 더하고 싶습니다. 나는 가치를 계산하는 방법을 모른다. 값을 @PostMapping ( "/ reg_success")에 게시 할 수 있으므로 reg_success.html 페이지에서 총계를 어떻게 계산하고 표시 할 수 있습니까? 지금까지 시도한 내용은 아래에 첨부했습니다.

나는 오류를 얻었다

org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/index.html]")
    at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:241) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666) ~[thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) [thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) [thymeleaf-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366) [thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190) [thymeleaf-spring5-3.0.12.RELEASE.jar:3.0.12.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1393) [spring-webmvc-5.3.3.jar:5.3.3]
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1138) [spring-webmvc-5.3.3.jar:5.3.3]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1077) [spring-webmvc-5.3.3.jar:5.3.3]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) [spring-webmvc-5.3.3.jar:5.3.3]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.3.3.jar:5.3.3]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) [spring-webmvc-5.3.3.jar:5.3.3]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) [tomcat-embed-core-9.0.41.jar:4.0.FR]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.3.3.jar:5.3.3]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) [tomcat-embed-core-9.0.41.jar:4.0.FR]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.41.jar:9.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.3.3.jar:5.3.3]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.3.jar:5.3.3]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.3.3.jar:5.3.3]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.3.jar:5.3.3]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.3.3.jar:5.3.3]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.3.3.jar:5.3.3]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.41.jar:9.0.41]
    at

StudentContoller

   @Controller
public class StudentContoller 
    {
    @GetMapping("/index")
    public String sendForm(Model model) {
        model.addAttribute("student", new Student());
        return "index";
    }

    @PostMapping("/reg_success")
    public String processForm(@ModelAttribute Student student, BindingResult result, Model model)
    {
        model.addAttribute("student", student);
        return "reg_success";
    }
 
}

Student.java

  public class Student 
{
     private int num1;
     private int num2;
     
    public int getNum1() 
    {
        return num1;
    }
    public void setNum1(int num1) 
    {
        this.num1 = num1;
    }
    public int getNum2() 
    {
        return num2;
    }
    public void setNum2(int num2) 
    {
        this.num2 = num2;
    }
    
    public int getTotal() {
        return num1 + num2;
    }
}

index.html

  <!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Add User</h1>

<form th:action="@{/reg_success}" th:object="${student}" method="post">
        Studnt ID: <input type="text" id="id" name="id" value="0">
    </p>
    
   <p>
    Num1 <input type="text" id="num1" th:field="*{num1}" name="num1" value="">
</p>
<p>
    Num2 <input type="text" id="num2" th:field="*{num2}" name="num2" value="">
</p> 
    
    <p>
        <input type="submit" value="Submit"/> <input type="reset" value="Reset">
    </p>
</form>
</body>
</html>

reg_success.html

    <!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <title>Show message</title>
    <meta charset="UTF-8">
</head>
<body>

<h1>Result</h1>

<p th:text="${student.getTotal()}"></p>  





</body>
</html>

2. 해결방안:

컨트롤러를 친절하게 업데이트하십시오 .

@GetMapping("/index")
public String sendForm(Model model) {
    model.addAttribute("student", new Student());
    return "index";
}

이 코드를 index.html 에서 친절하게 변경하십시오.

<p>
    Num1 <input type="text" id="num1" name="num1" value="">
</p>
<p>
    Num2 <input type="text" id="num2" name="num2" value="">
</p>

에:

<p>
    Num1 <input type="text" id="num1" th:field="*{num1}" name="num1" value="">
</p>
<p>
    Num2 <input type="text" id="num2" th:field="*{num2}" name="num2" value="">
</p>

이 방법을 학생에게 추가하십시오.

public int getTotal() {
    return num1 + num2;
}

마지막으로 reg_success.html을 업데이트하십시오 .

<p th:text="${student.getTotal()}"></p>

참고 이 솔루션이 문제에 대한 독점이라고하고 미래를위한 당신은 당신이 당신의 엔티티를 지속해야 할 때 특히 서비스를 생성 할 수 있습니다.

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