在Spring boot资源文件夹中访问xml时出现java问题

1 周，6 日 Questions & Answers 79

大家好我有个问题。我正在运行一个Spring Boot应用程序，其中的DataInitializer实现了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>

问题在于，在这个DataInitializer运行方法中，我正在初始化一个名为UserDto的对象：

@XmlRootElement(name = "user")
@XmlAccessorType(value = XmlAccessType.FIELD)
public class UserDto {

    @XmlElement(name = "first_name")
    private String firstName;

    @XmlElement(name = "last_name")
    private String lastName;

    @XmlElement(name = "city")
    private String city;

    public UserDto() {
    }

    public UserDto(String firstName, String lastName, String city) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.city = city;
    }

。。。。。。。能手和二传手

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。以下是代码：

@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，所以当我访问用户时。资源文件夹中的xml文件，然后单击复制路径->；我正在从content root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

当使用绝对路径时，一切正常。我现在知道，当编译应用程序时，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机器上，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或任何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。当我打印文件时。exists（），它告诉我文件存在->；没错

编辑：我试过使用src/main/resources/xmls/users。xml，xmls/users。xml，resources/xmls/users。只有绝对路径才能访问这些文件

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在Spring boot资源文件夹中访问xml时出现java问题

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