MaxMind从IP地址获取LAT/LNG，InvalidDatabaseException错误

Question

我的最终目标是获得与提供的ip地址相关联的纬度、经度和国家。我正在使用java和MaxMind GeoIP2 java API。我的偏好是不使用他们的webapi，因为我需要快速周转的时间。

有人能告诉我为什么当我调用绑定在MaxMind api调用中的函数时会出现这个错误吗（错误后面显示的代码）？

com.maxmind.db.InvalidDatabaseException: Could not find a MaxMind DB metadata marker in this file (GeoLite2-City-Blocks-IPv6.csv). Is this a valid MaxMind DB file?
at com.maxmind.db.Reader.findMetadataStart(Reader.java:231)
at com.maxmind.db.Reader.<init>(Reader.java:82)
at com.maxmind.db.Reader.<init>(Reader.java:74)
at com.maxmind.geoip2.DatabaseReader.<init>(DatabaseReader.java:41)
at com.maxmind.geoip2.DatabaseReader.<init>(DatabaseReader.java:31)
at com.maxmind.geoip2.DatabaseReader$Builder.build(DatabaseReader.java:126)
at com.tutelatechnologies.tapfortap.server.maxmind.MaxMindLookUp.maxMindLookup(MaxMindLookUp.java:20)
at com.tutelatechnologies.tapfortap.server.cidlaclookup.T4TUtilitiesTest.testMaxMindLookUpTest(T4TUtilitiesTest.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

我的代码：

public class MaxMindLookUp {

public static final void maxMindLookup(final String ipaddress) {
    File db = new File(
            "src/main/java/com/tutelatechnologies/tapfortap/server/maxmind/GeoLite2-City-Blocks-IPv6.csv");
    try {
        DatabaseReader reader = new DatabaseReader.Builder(db).build();
        InetAddress ip = InetAddress.getByName(ipaddress);

        CityResponse response = reader.city(ip);
        Location loc = response.getLocation();

        Double lat = loc.getLatitude();
        Double lng = loc.getLongitude();
        Integer acc = loc.getAccuracyRadius();

        System.out.println("lat=" + lat + "\nlng=" + lng + "\nacc=" + acc);

    } catch (GeoIp2Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}

注意：为了运行上面的代码，您需要在Maven Dependencies部分添加一个插件。

 <dependency>
    <groupId>com.maxmind.geoip2</groupId>
    <artifactId>geoip2</artifactId>
    <version>2.1.0</version>
</dependency>

我没有遇到太多关于SO的确切错误。我已执行调试器,错误发生在这一行：

DatabaseReader reader = new DatabaseReader.Builder(db).build();

我能够使用二进制db文件(geolite2-city.mmdb)使其工作。我留着这个问题，以防任何人有任何更多的信息，为什么CSV db文件不为我工作。

Answer 1

您使用的库用于读取GeoIP2的二进制数据库文件。CSV文件供人们加载到数据库中（或他们想要使用CSV的任何其他方式）。