Spring Boot:无法从资源加载文件

Question

我的Spring Boot项目中有几个带有SQL查询的文件.这些查询按路径定位

spring-boot-sql-in-files/src/main/resources/sql/query.sql

当我运行我的应用程序时,我执行这些查询加载到静态变量.

private static final String PATH_PREFIX = "src/main/resources/sql/";

public static String loadQueryFromFile(@NonNull String fileName) {
    try {
        return FileUtils.readFileToString(new File(PATH_PREFIX + fileName), Charset.defaultCharset());
    } catch (Exception e) {
        log.error("Error occurred during loading sql file to string, file=" + fileName, e);
        throw new QueryNotLoadedException();
    }
}

当我使用IDE运行它时工作正常,但是当我运行name.jar文件时它不起作用,我得到以下错误:

java.io.FileNotFoundException: File 'src/main/resources/sql/query.sql' does not exist

我该如何修复这条路？

Answer 1

src/main/resources喜欢src/main/java成为你的类路径的根,因此将无法正常工作.它不会只工作sql,以及时的包装它不是一个文件jar.而是使用Spring Resource抽象加载文件并将其StreamUtils加载到String.

public static String loadQueryFromFile(@NonNull String fileName) {
    try {
        Resource resource = new ClassPathResource("sql/" + fileName);
        return StreamUtils.copyToString(resource.getInputStream(), Charset.defaultCharset());
    } catch (Exception e) {
        log.error("Error occurred during loading sql file to string, file=" + fileName, e);
        throw new QueryNotLoadedException();
    }
}

这样的事情应该可以解决问题.