主页 / 问题

问题[spring-mvc]

Martin Hope
Илья Гопак
Asked: 2022-07-17 01:14:12 +0800 CST
  • 0

我正在使用@Valid 注释。如果我理解正确的话，那么这个注解应该不仅要验证实体并填写BindingResult，还要自动将实体放入jsp模型中。所以。如何在 jsp 中获取“employeeDto”对象？

@PostMapping
public ModelAndView create(@Valid @ModelAttribute("employeeDto") EmployeeDto employeeDto,
                           BindingResult bindingResult) {

    ModelAndView mav = new ModelAndView("/action/employee/add_employee");
    //business logic

    if (bindingResult.hasErrors()) {
        mav.addObject("entity", employeeDto); //Как избавиться от этой строчки?
        return mav;
    }

    //business logic
    return mav;
}

例如，要获取错误，我使用以下代码：

<spring:hasBindErrors name="employeeDto">
    <s:set scope="page" var="errors" value="${errors}"/>
</spring:hasBindErrors>

但是如何获得employeeDto？

spring-mvc jsp
Martin Hope
Денис Короленко
Asked: 2022-07-04 20:51:30 +0800 CST
  • 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
YoungDarthVader
Asked: 2020-06-11 15:59:22 +0800 CST
  • 0

我正在编写 spring-boot，spring-mvc 应用程序。它有两个实体用户和任务。任务必须由特定用户拥有，我正在尝试使用 @OneToMany、@ManyToOne 和 @JoinColumn 使用外键来完成它。

用户.java：

package ru.chausov.to_do_list.data_base.entities;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import ru.chausov.to_do_list.data_base.types.Gender;

import javax.persistence.*;
import java.time.LocalDate;
import java.util.HashSet;
import java.util.Set;


@Data
@Builder
@Entity
@Table(name="users")
@NoArgsConstructor
@AllArgsConstructor
public class User {
    @Id
    @GeneratedValue
    private Long id; 
    private String name;
    private String lastName;
    private LocalDate birthDate;
    private Gender gender;
    private String address;
    private String company;
    @OneToMany(mappedBy = "id", cascade = CascadeType.ALL, orphanRemoval = true)
    private final Set<Task> tasks = new HashSet<>();

}

任务.java：

package ru.chausov.to_do_list.data_base.entities;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

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


@Data
@Builder
@Entity
@Table(name="tasks")
@NoArgsConstructor
@AllArgsConstructor
public class Task {
    @Id
    @GeneratedValue
    private Long id; 
    private String name;
    private String description;
    private LocalDateTime receivedDate;
    private LocalDateTime toBeDone;
    private boolean done;
    @ManyToOne
    @JoinColumn(name = "user_id")
    private User user;
}

制作了从 CrudRepository 继承的标准存储库。

用户Repositpry.java：

package ru.chausov.to_do_list.data_base.repositories;

import org.springframework.data.repository.CrudRepository;
import ru.chausov.to_do_list.data_base.entities.User;


public interface UsersRepository extends CrudRepository<User, Long> {
}

TasksRepository.java：

package ru.chausov.to_do_list.data_base.repositories;

import org.springframework.data.repository.CrudRepository;
import ru.chausov.to_do_list.data_base.entities.Task;


public interface TasksRepository extends CrudRepository<Task, Long> {
}

写了一个 junit/spring-boot 测试。

UserRepositoryTest.java：

package ru.chausov.to_do_list.data_base.repositories;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import ru.chausov.to_do_list.data_base.entities.Task;
import ru.chausov.to_do_list.data_base.entities.User;


@RunWith(SpringRunner.class)
@SpringBootTest
public class TasksRepositoryTests {
    @Autowired
    private TasksRepository tasksRepository;
    @Autowired
    private UsersRepository usersRepository;

    @Test
    public void saveTest() {
        User user = new User();

        usersRepository.save(user);

        Task taskToSave = Task.builder().user(user).build();

        Task savedTask = tasksRepository.save(taskToSave);

        Assert.assertEquals(savedTask, taskToSave);
    }

当我运行测试时，我得到一个错误：

org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint ["FKO4W1P8Y0P6E0GSR7VHBDG76KO: PUBLIC.TASKS FOREIGN KEY(ID) REFERENCES PUBLIC.USERS(ID) (2)"; SQL statement:
insert into tasks (description, done, name, received_date, to_be_done, user_id, id) values (?, ?, ?, ?, ?, ?, ?) [23506-197]]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement

    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:296)
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:253)
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:536)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:746)
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:714)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:533)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:304)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:138)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy97.save(Unknown Source)
    at ru.chausov.to_do_list.data_base.repositories.TasksRepositoryTests.saveTest(TasksRepositoryTests.java:29)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
    at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
    at org.junit.runners.Suite.runChild(Suite.java:128)
    at org.junit.runners.Suite.runChild(Suite.java:27)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:112)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:178)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3174)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3688)
    at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:90)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:604)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:478)
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:356)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1453)
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:510)
    at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3282)
    at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2478)
    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:473)
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:178)
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:39)
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:271)
    at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:104)
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:532)
    ... 55 more
Caused by: org.h2.jdbc.JdbcSQLException: Нарушение ссылочной целостности: "FKO4W1P8Y0P6E0GSR7VHBDG76KO: PUBLIC.TASKS FOREIGN KEY(ID) REFERENCES PUBLIC.USERS(ID) (2)"
Referential integrity constraint violation: "FKO4W1P8Y0P6E0GSR7VHBDG76KO: PUBLIC.TASKS FOREIGN KEY(ID) REFERENCES PUBLIC.USERS(ID) (2)"; SQL statement:
insert into tasks (description, done, name, received_date, to_be_done, user_id, id) values (?, ?, ?, ?, ?, ?, ?) [23506-197]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:357)
    at org.h2.message.DbException.get(DbException.java:179)
    at org.h2.message.DbException.get(DbException.java:155)
    at org.h2.constraint.ConstraintReferential.checkRowOwnTable(ConstraintReferential.java:332)
    at org.h2.constraint.ConstraintReferential.checkRow(ConstraintReferential.java:274)
    at org.h2.table.Table.fireConstraints(Table.java:995)
    at org.h2.table.Table.fireAfterRow(Table.java:1013)
    at org.h2.command.dml.Insert.insertRows(Insert.java:192)
    at org.h2.command.dml.Insert.update(Insert.java:134)
    at org.h2.command.CommandContainer.update(CommandContainer.java:102)
    at org.h2.command.Command.executeUpdate(Command.java:261)
    at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:199)
    at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:153)
    at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61)
    at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:175)
    ... 72 more

据我了解，该错误是由于未填写外键user_id引起的。

创建对象时如何使其填充？

spring-mvc
Martin Hope
Владислав
Asked: 2020-02-01 20:04:23 +0800 CST
  • 0

我正在尝试建立一个 Spring Boot 项目，更准确地说，我正在将我的 MVC 项目转移到 Spring Boot，以免部署到 Tomcat。我摆脱了 applicationContext.xml 并且第一次将所有内容与注释混合在一起传输到 JavaConfig，更准确地说，在 applicationContext.xml 中我只有一个与数据库的连接。

它是：

<bean id="zkSettingsHolder" class="com.uraltranscom.calculaterate.util.ZookeeperUtil.ZookeeperSettingHolder" />

<!-- дешифровка пароля -->
<bean id="decodedPassword" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetClass" value="com.uraltranscom.calculaterate.util.ZookeeperUtil.KeyMaster"/>
    <property name="targetMethod" value="dec"/>
    <property name="arguments">
        <list>
            <value>#{zkSettingsHolder.password}</value>
            <value>#{zkSettingsHolder.secretKey}</value>
        </list>
    </property>
</bean>

<!-- устанавливаем соединение -->
<bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource" lazy-init="false"  destroy-method="close">
    <property name="driverClassName" value="org.postgresql.Driver"/>
    <property name="url" value="#{zkSettingsHolder.dataBase}"/>
    <property name="username" value="#{zkSettingsHolder.user}"/>
    <property name="password" value="#{decodedPassword}"/>

</bean>

<bean class="com.uraltranscom.calculaterate.util.ConnectUtil.ConnectionDB">
    <property name="dataSource" ref="dataSource"/>
</bean>

它变成了：

@Configuration
@ComponentScan({"com.ex.calc"})
public class AppConfig {

@Bean
@Primary
public ZookeeperSettingHolder zookeeperSettingHolder() {
    return new ZookeeperSettingHolder();
}

@Bean
public CommonsMultipartResolver commonsMultipartResolver() {
    CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
    commonsMultipartResolver.setMaxUploadSize(10000000);
    return commonsMultipartResolver;
}

@Bean(name = "decodedPassword")
public MethodInvokingFactoryBean methodInvokingFactoryBean() throws Exception {
    MethodInvokingFactoryBean methodInvokingFactoryBean = new MethodInvokingFactoryBean();
    methodInvokingFactoryBean.setTargetClass(KeyMaster.class);
    methodInvokingFactoryBean.setTargetMethod("dec");
    methodInvokingFactoryBean.setArguments(new String[] {zookeeperSettingHolder().getPassword(), zookeeperSettingHolder().getSecretKey()});
    methodInvokingFactoryBean.afterPropertiesSet();
    return methodInvokingFactoryBean;
}

@Bean(destroyMethod = "close")
public DataSource dataSource() throws Exception {
    DataSource dataSource = new DataSource();
    dataSource.setDriverClassName("org.postgresql.Driver");
    dataSource.setUrl(zookeeperSettingHolder().getDataBase());
    dataSource.setUsername(zookeeperSettingHolder().getUser());
    dataSource.setPassword((String) methodInvokingFactoryBean().getObject());
    return dataSource;
}

@Bean
public ConnectionDB connectionDB() throws Exception {
    ConnectionDB connectionDB = new ConnectionDB();
    connectionDB.setDataSource(dataSource());
    return connectionDB;
}
}

在项目中，我使用注释 @Component 和 @Autowired

我添加了所有依赖项，在 Spring.io 网站上创建了项目本身，我不记得具体了，在那里你选择了必要的依赖项，等等。

应用类

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan({"com.ex.calc"})
public class CalcApplication {

public static void main(String[] args) {
    SpringApplication.run(CalcApplication .class, args);
}

}

我正在尝试开始，但出现错误

Caused by: java.lang.NullPointerException: null
at com.ex.calc.dao.AbstractObjectFactory.<init>(AbstractObjectFactory.java:21) ~[classes/:na]
at com.ex.calc.dao.GetTotalModelDAO.<init>(GetTotalModelDAO.java:28) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]

同时，GetTotalModelDAO 使用 Lombok 库中的 @Component 和 @NoArgsConstructor 注释进行标记。

如果你从上到下，那么他对我的控制器发誓

Error creating bean with name 'restControllerGetRate': Unsatisfied dependency expressed through field 'commonLogicClass'

控制器有一个 CommonLogicClass 声明，并且还标有 @Component

@Autowired
private CommonLogicClass commonLogicClass;

然后他自然而然的发誓

Error creating bean with name 'commonLogicClass': Unsatisfied dependency expressed through field 'getTotalModelDAO'

在 CommonLogicClass 类中有一个声明 GetTotalModelDAO

@Autowired
private GetTotalModelDAO getTotalModelDAO;

并低于错误

Error creating bean with name 'getTotalModelDAO' defined in file [C:\Users\user124\Desktop\demo\target\classes\com\ex\calc\dao\GetTotalModelDAO.class]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.ex.calc.dao.dao.GetTotalModelDAO]: Constructor threw exception; nested exception is java.lang.NullPointerException

我不明白为什么它会为 null 以及如何初始化组件。我读了很多东西，尝试了一切，到处都是如此简单，似乎可以启动，不需要任何额外的东西，但这里一切都是直的，一个管道（（

public class GetTotalModelDAO extends AbstractObjectFactory<TotalModel> {

抽象对象工厂：

@Getter
public abstract class AbstractObjectFactory<T> extends ConnectionDB implements 
ObjectFactory {
private Connection connection;

{
    try {
        connection = getDataSource().getConnection();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

@Override
public abstract T getObject(Map<String, Object> params);
}

它只会继承 AppConfig 中的 ConnectionDB bean

@Bean
public ConnectionDB connectionDB() throws Exception {
    ConnectionDB connectionDB = new ConnectionDB();
    connectionDB.setDataSource(dataSource());
    return connectionDB;
}

哪个是单例

public class ConnectionDB {
private static DataSource dataSource;

private static volatile ConnectionDB instance;

public static ConnectionDB getInstance() {
    ConnectionDB localInstance = instance;
    if (localInstance == null) {
        synchronized (ConnectionDB.class) {
            localInstance = instance;
            if (localInstance == null) {
                instance = localInstance = new ConnectionDB();
            }
        }
    }
    return localInstance;
}

public static DataSource getDataSource() {
    return dataSource;
}

public static void setDataSource(DataSource dataSource) {
    ConnectionDB.dataSource = dataSource;
}
}

请提供建议，也许我以某种方式错误配置了一些东西。如果您需要更多信息，请说出来。

spring-mvc
Martin Hope
titaniche
Asked: 2020-01-30 20:45:06 +0800 CST
  • 0

再会。请告诉我为什么会出现以下问题： 应用程序构建并启动后，浏览器中的窗口显示奇怪的内容。此外，消息来源显示没有编译过的脚本。

页

但是，如果您将其写入地址栏中.../index.html，应用程序将加载并开始工作。

页

然而，如果您刷新浏览器页面 - 在这种情况下，情况将再次重复，如上图（如果 url 是 form url/<application_context>/）或 Whitelabel Error Page 错误（如果 url 是 form url/<application_context>/child/anotherChild...）

我对可能导致这些问题的原因感到有些困惑，所以我什至不知道要包括哪些资源来帮助解决问题。以下是其中一些：

包.json

{
  "name": "asterisk-prime-ui",
  "version": "1.0.0",
  "..": "main.ts",
  "scripts": {
    "ng": "ng",
    "start": "ng serve --proxy-config proxy.conf.json",
    "build-prod": "ng build --prod",
    "build-dev": "ng build --aot --build-optimizer --vendor-chunk",
    "extract": "ngx-translate-extract --input ./src/app --output ./src/assets/i18n/*.json --clean --sort --format namespaced-json --marker _",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^6.1.7",
    "@angular/cdk": "^6.4.7",
    "@angular/common": "^6.1.7",
    "@angular/compiler": "^6.1.7",
    "@angular/core": "^6.1.7",
    "@angular/flex-layout": "^6.0.0-beta.18",
    "@angular/forms": "^6.1.7",
    "@angular/http": "^6.1.7",
    "@angular/material": "^6.4.7",
    "@angular/platform-browser": "^6.1.7",
    "@angular/platform-browser-dynamic": "^6.1.7",
    "@angular/router": "^6.1.7",
    "core-js": "^2.5.4",
    "hammerjs": "^2.0.8",
    "net": "^1.0.2",
    "rxjs": "^6.3.2",
    "rxjs-compat": "^6.3.2",
    "zone.js": "^0.8.29"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.7.0",
    "@angular/cli": "~6.1.5",
    "@angular/compiler-cli": "^6.1.7",
    "@angular/language-service": "^6.1.7",
    "@biesbjerg/ngx-translate-extract": "^2.3.4",
    "@ngx-translate/core": "^10.0.2",
    "@ngx-translate/http-loader": "^3.0.1",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "@types/sockjs-client": "^1.1.0",
    "@types/stompjs": "^2.3.4",
    "@types/yargs": "^12.0.5",
    "codelyzer": "^4.4.4",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "^3.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "^2.0.3",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "sockjs-client": "^1.1.5",
    "stompjs": "^2.3.3",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1",
    "typescript": "^2.9.2",
    "yargs": "^12.0.5"
  }
}

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "outDir": "./dist/out-tsc",
    "baseUrl": "/",
    "target": "es5",
    "module": "es2015",
    "moduleResolution": "node",
    "sourceMap": true,
    "declaration": false,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "lib": [
      "es6",
      "es7",
      "dom"
    ],
    "typeRoots": [
      "node_modules/@types"
    ]
  },
  "exclude": [
    "../../node_modules"
  ]
}

角.json

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "asterisk-prime-ui": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "prefix": "app",
      "schematics": {
        "@schematics/angular:component": {
          "styleext": "less"
        }
      },
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "../../../../asterisk-prime/src/main/resources/static/asterisk-prime-ui",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              {
                "glob": "**/*",
                "input": "src/assets",
                "output": "/assets"
              },
              {
                "glob": "favicon.ico",
                "input": "src",
                "output": "/"
              }
            ],
            "styles": [
              {
                "input": "node_modules/@angular/material/prebuilt-themes/indigo-pink.css"
              },
              {
                "input": "src/styles/global.scss"
              }
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "asterisk-prime-ui:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "asterisk-prime-ui:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "asterisk-prime-ui:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "karmaConfig": "src/karma.conf.js",
            "styles": [
              {
                "input": "node_modules/@angular/material/prebuilt-themes/indigo-pink.css"
              },
              {
                "input": "src/styles/global.scss"
              }
            ],
            "scripts": [],
            "assets": [
              {
                "glob": "**/*",
                "input": "src/assets",
                "output": "/assets"
              },
              {
                "glob": "favicon.ico",
                "input": "src",
                "output": "/"
              }
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    },
    "asterisk-prime-ui-e2e": {
      "root": "e2e/",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "asterisk-prime-ui:serve"
          },
          "configurations": {
            "production": {
              "devServerTarget": "asterisk-prime-ui:serve:production"
            }
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": "e2e/tsconfig.e2e.json",
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
  },
  "defaultProject": "asterisk-prime-ui",
  "schematics": {
    "@schematics/angular:component": {
      "styleext": "scss"
    }
  }
}

索引.html

<!doctype html>
<html lang="en">
<head>
  <base href=".">
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  <title>AsteriskPrimeUI</title>
  <meta name="description" content="">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet" />
  <link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500" rel="stylesheet" />
</head>
<body>
<app-root>Loading...</app-root>
</body>
</html>

前端部分在 spring-boot 应用程序的静态资源中组装和布局（请参阅 参考资料"outputPath": "../../../../asterisk-prime/src/main/resources/static/asterisk-prime-ui"）。此外，所有这些都收集在战争档案中。

WebMvcConfig.java

@Configuration
@EnableWebMvc
public class WebMvcConfig implements WebMvcConfigurer
{
    @Value("#{'${web.mvc.crossOrigins}'.split(',')}")
    private String[] crossOrigins;

    private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {
            "classpath:/META-INF/resources/",
            "classpath:/resources/",
            "classpath:/static/",
            "classpath:/public/",
            "classpath:/static/asterisk-prime-ui/"
    };

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry)
    {
        if (!registry.hasMappingForPattern("/webjars/**"))
        {
            registry.addResourceHandler("/webjars/**")
                    .addResourceLocations("/webjars/");
        }

        if (!registry.hasMappingForPattern("/**"))
        {
            registry.addResourceHandler("/**")
                    .addResourceLocations(CLASSPATH_RESOURCE_LOCATIONS);
        }
    }

    @Override
    public void addCorsMappings(CorsRegistry registry)
    {
        registry.addMapping("/api/**")
                .allowedOrigins(crossOrigins)
                .allowCredentials(true)
                .maxAge(3600);
    }

    @Bean
    public ViewResolver urlViewResolver()
    {
        UrlBasedViewResolver viewResolver = new UrlBasedViewResolver();
        viewResolver.setViewClass(InternalResourceView.class);
        return viewResolver;
    }
}

提前感谢大家的帮助。

spring-mvc