Question

我有这个用Spring Boot编写的基本应用程序，带有一个Web控制器。我添加了一个HTML表单来添加一些输入，这些输入将使用JpaRepository save方法保存输入。

我使用Thymeleaf作为我的模板引擎，MySql作为DB。当我运行应用程序时，它运行得很好。但是，当我点击localhost：8080 / addExpense页面时，它会出现一个白标错误页面，其中包含以下错误：

出现意外错误（type = Internal Server Error，状态= 500）。执行处理器期间出错＆org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor＆＃39; （模板：＆＃34; addExpense＆＃34; - 第19行，第49栏）

我认为问题在于此代码

个：字段=＆＃34; * {费用}＆＃34;

我的IDE控制台会输出以下错误：

org.thymeleaf.exceptions.TemplateProcessingException：期间出错执行处理器＆＃39; org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor＆＃39; （模板：＆＃34; addExpense＆＃34; - 第19行，第49栏）at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess（AbstractAttributeTagProcessor.java:117）〜[thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.processor.element.AbstractElementTagProcessor.process（AbstractElementTagProcessor.java:95）〜[thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.util.ProcessorConfigurationUtils $ ElementTagProcessorWrapper.process（ProcessorConfigurationUtils.java:633）〜[thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement（ProcessorTemplateHandler.java:918）〜[thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.engine.StandaloneElementTag.beHandled（StandaloneElementTag.java:228）〜[thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.engine.TemplateModel.process（TemplateModel.java:136）〜[thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.engine.TemplateManager.parseAndProcess（TemplateManager.java:661）〜[thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.TemplateEngine.process（TemplateEngine.java:1098） [thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.TemplateEngine.process（TemplateEngine.java:1072） [thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.renderFragment（ThymeleafView.java:354） [thymeleaf-spring5-3.0.9.RELEASE.jar:3.0.9.RELEASE] at org.thymeleaf.spring5.view.ThymeleafView.render（ThymeleafView.java:187） [thymeleaf-spring5-3.0.9.RELEASE.jar:3.0.9.RELEASE] at org.springframework.web.servlet.DispatcherServlet.render（DispatcherServlet.java:1325） [spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.processDispatchResult（DispatcherServlet.java:1069） [spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:1008） [spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:925） [spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:974） [spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:866） [spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at javax.servlet.http.HttpServlet.service（HttpServlet.java:635） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:851） [spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at javax.servlet.http.HttpServlet.service（HttpServlet.java:742） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:231） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52） [tomcat-embed-websocket-8.5.31.jar：8.5.31] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.springframework.web.filter.RequestContextFilter.doFilterInternal（RequestContextFilter.java:99） [spring-web-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107） [spring-web-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal（HttpPutFormContentFilter.java:109） [spring-web-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107） [spring-web-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:81） [spring-web-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107） [spring-web-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal（CharacterEncodingFilter.java:200） [spring-web-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107） [spring-web-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:193） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:166） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:198） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:96） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:496） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:140） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:81） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:87） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:342） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.coyote.http11.Http11Processor.service（Http11Processor.java:803） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.coyote.AbstractProcessorLight.process（AbstractProcessorLight.java:66） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.coyote.AbstractProtocol $ ConnectionHandler.process（AbstractProtocol.java:790） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1468） [tomcat-embed-core-8.5.31.jar：8.5.31] at org.apache.tomcat.util.net.SocketProcessorBase.run（SocketProcessorBase.java:49） [tomcat-embed-core-8.5.31.jar：8.5.31] at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1149） [na：1.8.0_161] at java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:624） [na：1.8.0_161] at org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61） [tomcat-embed-core-8.5.31.jar：8.5.31] at java.lang.Thread.run（Thread.java:748)[na:1.8.0_161]引起： java.lang.IllegalStateException：既不是BindingResult也不是普通的 bean名称的目标对象＆＃39;费用＆＃39;可用作请求属性在 org.springframework.web.servlet.support.BindStatus。（BindStatus.java:153）〜[spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.springframework.web.servlet.support.RequestContext.getBindStatus（RequestContext.java:903）〜[spring-webmvc-5.0.6.RELEASE.jar：5.0.6.RELEASE] at org.thymeleaf.spring5.context.webmvc.SpringWebMvcThymeleafRequestContext.getBindStatus（SpringWebMvcThymeleafRequestContext.java:227）〜[thymeleaf-spring5-3.0.9.RELEASE.jar:3.0.9.RELEASE] at org.thymeleaf.spring5.util.FieldUtils.getBindStatusFromParsedExpression（FieldUtils.java:305）〜[thymeleaf-spring5-3.0.9.RELEASE.jar:3.0.9.RELEASE] at org.thymeleaf.spring5.util.FieldUtils.getBindStatus（FieldUtils.java:252）〜[thymeleaf-spring5-3.0.9.RELEASE.jar:3.0.9.RELEASE] at org.thymeleaf.spring5.util.FieldUtils.getBindStatus（FieldUtils.java:226）〜[thymeleaf-spring5-3.0.9.RELEASE.jar:3.0.9.RELEASE] at org.thymeleaf.spring5.processor.AbstractSpringFieldTagProcessor.doProcess（AbstractSpringFieldTagProcessor.java:174）〜[thymeleaf-spring5-3.0.9.RELEASE.jar:3.0.9.RELEASE] at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess（AbstractAttributeTagProcessor.java:74）〜[thymeleaf-3.0.9.RELEASE.jar：3.0.9.RELEASE] ... 56个常见框架省略

Here's my codes:

Model File: Expense.java

package com.ksk.expenseapp.model;


import javax.persistence.*;
import java.time.LocalDate;

@Entity
public class Expense {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @Column(name = "date")
    private String date;

    @Column(name = "expense")
    private String expense;

    @Column(name = "amount")
    private int amount;

    //No Arg Construction required by JPA
    public Expense() {
    }

    public Expense(String expense, int amount) {
        this.date = LocalDate.now().toString();
        this.expense = expense;
        this.amount = amount;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public String getExpense() {
        return expense;
    }

    public void setExpense(String expense) {
        this.expense = expense;
    }

    public int getAmount() {
        return amount;
    }

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

网络控制器文件

package com.ksk.expenseapp.controller;

import com.ksk.expenseapp.model.Expense;
import com.ksk.expenseapp.repo.ExpenseRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class WebController {

    ExpenseRepo expenseRepo;

    @Autowired
    public WebController(ExpenseRepo expenseRepo) {
        this.expenseRepo = expenseRepo;
    }

    @RequestMapping("/addExpense")
    public String addExpense(){
        return "addExpense";
    }

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String addNewExpense(@ModelAttribute Expense expense){
        expenseRepo.save(expense);
        return "addExpense";
    }
}

AddExpense html file

<!doctype html>
<html xmlns:th="http://www.thymeleaf.org" lang="en">
<head>
    <!-- Required meta tags -->
    <meta charset="utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"/>

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"/>

    <title>Hello, world!</title>
</head>
<body>
<h1>Add Expense</h1>

<form th:action="@{/save}" th:object="${expense}" method="post">
    <div class="form-group">
        <label>Expense</label>
        <input type="text" class="form-control" th:field="*{expense}"/>

        <label>Amount</label>
        <input type="text" class="form-control"  th:field="*{amount}"/>
        <button class="btn btn-success" type="submit">Submit</button>
    </div>

</form>


<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>

使用Thymeleaf在Spring Boot App中提交表单的问题

0 个答案: