Java 访问Spring启动资源文件夹中的xml时出现问题

大家好，我有个问题。我正在运行一个Spring启动应用程序，其中我有一个DataInitializer，它实现CommandLineRunner和Override run方法，以模拟应用程序的启动程序。DataInitializer被注释为@Component。该项目使用Maven，我为jaxb添加了三个依赖项：

        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.0</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-core</artifactId>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
        </dependency>

……接受者和接受者

它使用jaxb注释作为映射器。当我初始化这个对象并创建一个实例时，我试图将封送的数据写入资源文件夹，其中已经创建了xml。代码如下：

@Component
public class DataInitializer implements CommandLineRunner {

    private final UserService userService;


    @Autowired
    public DataInitializer(UserService userService) {
        this.userService = userService;

    }
    private final String USERS_FILE_PATH = "src/main/resources/xmls/users.xml";

    @Override
    public void run(String... args) throws Exception {

        UserDto user = new UserDto("k", "d", "e");


        JAXBContext context = JAXBContext.newInstance(UserDto.class);


        Marshaller marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);


        marshaller.marshal(user, new File("src/main/resources"));


    }
}

我使用的是IntliJ Ultimate Edition，因此当我转到资源文件夹中的users.xml文件并单击复制路径->时，我正在从内容根目录中选择路径。问题是当我运行应用程序，JVM调用这个run方法时，我收到错误，应用程序停止。错误：

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:787) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:768) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:322) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at com.softuni.xmlmapping.XmlMappingApplication.main(XmlMappingApplication.java:12) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.2.5.RELEASE.jar:2.2.5.RELEASE]
Caused by: javax.xml.bind.JAXBException: null
    at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:123) ~[jaxb-api-2.3.0.jar:2.3.0]
    at com.softuni.xmlmapping.init.DataInitializer.run(DataInitializer.java:51) ~[classes/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:784) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    ... 10 common frames omitted
Caused by: java.io.FileNotFoundException: src/main/resources (Is a directory)
    at java.base/java.io.FileOutputStream.open0(Native Method) ~[na:na]
    at java.base/java.io.FileOutputStream.open(FileOutputStream.java:292) ~[na:na]
    at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:235) ~[na:na]
    at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:185) ~[na:na]
    at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:116) ~[jaxb-api-2.3.0.jar:2.3.0]
    ... 12 common frames omitted

java.lang.IllegalStateException:无法执行CommandLineRunner
在org.springframework.boot.SpringApplication.callRunner（SpringApplication.java:787）~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
在org.springframework.boot.SpringApplication.callRunners（SpringApplication.java:768）~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
在org.springframework.boot.SpringApplication.run（SpringApplication.java:322）~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
在org.springframework.boot.SpringApplication.run（SpringApplication.java:1226）~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
在org.springframework.boot.SpringApplication.run（SpringApplication.java:1215）~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
在com.softuni.xmlmapping.XmlMappingApplication.main（XmlMappingApplication.java:12）~[classes/:na]
在java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0（本机方法）~[na:na]
在java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）~[na:na]
在java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）~[na:na]
在java.base/java.lang.reflect.Method.invoke（Method.java:567）~[na:na]
在org.springframework.boot.devtools.restart.RestartLauncher.run（RestartLauncher.java:49）~[spring-boot-devtools-2.2.5.RELEASE.jar:2.2.5.RELEASE]
原因：javax.xml.bind.JAXBException:null
在javax.xml.bind.helpers.AbstractMarshallerImpl.marshall（AbstractMarshallerImpl.java:123）~[jaxb-api-2.3.0.jar:2.3.0]
在com.softuni.xmlmapping.init.DataInitializer.run（DataInitializer.java:51）~[classes/:na]
在org.springframework.boot.SpringApplication.callRunner（SpringApplication.java:784）~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
... 省略10个公共框架
原因：java.io.FileNotFoundException:src/main/resources（是一个目录）
在java.base/java.io.FileOutputStream.open0（本机方法）~[na:na]
在java.base/java.io.FileOutputStream.open（FileOutputStream.java:292）~[na:na]
在java.base/java.io.FileOutputStream.（FileOutputStream.java:235）~[na:na]
在java.base/java.io.FileOutputStream.（FileOutputStream.java:185）~[na:na]
在javax.xml.bind.helpers.AbstractMarshallerImpl.marshall（AbstractMarshallerImpl.java:116）~[jaxb-api-2.3.0.jar:2.3.0]
... 省略了12个公共框架

当使用绝对路径时，一切正常。我现在知道，编译应用程序时，文件夹的工作方式与编写代码时不同。出现此问题的主要原因是，在windows计算机上，同样使用InteliJ Ultimate Edition，所有操作都使用内容根目录的路径。对我来说，我只能使用绝对值，或者选择文件名并从src文件夹外部创建它。我在MacOS机器上。intelij或其他东西是否有一些设置，因为windows上的工作方式很奇怪，但对我来说不是。windows机器不是我的，所以我不知道设置，目前我与此人没有联系。我们来自Spring数据课程，只在课堂上看到他。当我打印文件.exists（）时，它告诉我文件exist->true

---

编辑：我尝试使用src/main/resources/xmls/users.xml、xmls/users.xml、resources/xmls/users.xml等。只有绝对路径能够访问此文件。

问题在于InteliJ，我在InteliJ EAP 2020.1版上破坏了它，一切正常。如果某个版本有此问题，您可以尝试使用其他版本或重置该版本的所有设置。或者只是重新安装IDE。谢谢大家的回答。：）

尝试此路径：

xmls/users.xml

我尝试过，相同的错误为

resources

文件夹配置的输出文件夹是什么？构建路径配置将包含此信息。您能告诉我从哪里可以看到此信息，以便能够将其发送给youtry此

新文件（urldecker.decode（getClass（）.getClassLoader（）.getResource（“xmls/users.xml”）.getFile（），

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:787) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:768) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:322) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at com.softuni.xmlmapping.XmlMappingApplication.main(XmlMappingApplication.java:12) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.2.5.RELEASE.jar:2.2.5.RELEASE]
Caused by: javax.xml.bind.JAXBException: null
    at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:123) ~[jaxb-api-2.3.0.jar:2.3.0]
    at com.softuni.xmlmapping.init.DataInitializer.run(DataInitializer.java:51) ~[classes/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:784) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    ... 10 common frames omitted
Caused by: java.io.FileNotFoundException: src/main/resources (Is a directory)
    at java.base/java.io.FileOutputStream.open0(Native Method) ~[na:na]
    at java.base/java.io.FileOutputStream.open(FileOutputStream.java:292) ~[na:na]
    at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:235) ~[na:na]
    at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:185) ~[na:na]
    at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:116) ~[jaxb-api-2.3.0.jar:2.3.0]
    ... 12 common frames omitted