java-spring与flyway加载jar包内文件示例

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文件加载

操作磁盘文件 java.io.File
操作jar包内文件 java.util.jar.JarFile
扫描classpath下文件(含jar包内文件) Enumeration urlEnumerations = classLoader.getResources(path);

flyway示例

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package com.sysware;

import org.flywaydb.core.internal.util.scanner.Resource;
import org.flywaydb.core.internal.util.scanner.classpath.ClassPathLocationScanner;
import org.flywaydb.core.internal.util.scanner.classpath.ClassPathResource;
import org.flywaydb.core.internal.util.scanner.classpath.FileSystemClassPathLocationScanner;
import org.flywaydb.core.internal.util.scanner.classpath.JarFileClassPathLocationScanner;
import org.junit.Test;

import java.net.URL;
import java.util.Enumeration;
import java.util.Set;
import java.util.TreeSet;

public class FlywayFileScannerTest {

    @Test
    public void jarScanner() throws Exception {
        String path = "customize/sql";//classpath:
        ClassLoader classLoader = getClass().getClassLoader();
        Set<Resource> resources = new TreeSet<>();

        Enumeration<URL> urlEnumerations = classLoader.getResources(path);
        while (urlEnumerations.hasMoreElements()) {
            URL url = urlEnumerations.nextElement();

            // jar/file
            String protocol = url.getProtocol();
            ClassPathLocationScanner locationScanner = null;
            //文件的话直接读
            if ("file".equalsIgnoreCase(protocol)) {
                locationScanner = new FileSystemClassPathLocationScanner();
            } else if ("jar".equalsIgnoreCase(protocol)) {
                locationScanner = new JarFileClassPathLocationScanner();
            }
            if (locationScanner == null) {
                System.err.println(url.getFile());
                continue;
            }

            Set<String> resourceNames = locationScanner.findResourceNames(path, url);
            for (String resourceName : resourceNames) {
                if (resourceName == null || !resourceName.endsWith("sql")) continue;
                resources.add(new ClassPathResource(resourceName, classLoader));
            }
        }

        System.out.println(resources);
        for (Resource resource : resources) {
            System.out.println(resource.getFilename());
            System.out.println(resource.loadAsString("UTF-8"));
        }
    }

}

spring示例

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package com.sysware;

import org.apache.commons.io.IOUtils;
import org.junit.Test;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

public class SpringFileScannerTest {

    @Test
    public void jarScanner() throws Exception {
        PathMatchingResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
        Resource[] resources = resourcePatternResolver.getResources("classpath*:customize/sql/*.sql");
        for (Resource resource : resources) {
            System.out.println(resource.getFilename());
            System.out.println(IOUtils.toString(resource.getInputStream()));
        }
    }
}