如果我有一个需要文件路径的构造函数，我该如何“伪造”如果它被包装成一个罐子？ [英] If I have a constructor that requires a path to a file, how can I "fake" that if it is packaged into a jar?

问题描述

这个问题的上下文是，我正尝试在我编写的猪脚本中使用maxmind java api ...但我不认为知道这两者是否有必要回答这个问题，但是。

The context of this question is that I am trying to use the maxmind java api in a pig script that I have written... I do not think that knowing about either is necessary to answer the question, however.

maxmind API有一个构造函数，它需要一个名为GeoIP.dat的文件的路径，该文件是一个逗号分隔的文件，它具有所需的信息。

The maxmind API has a constructor which requires a path to a file called GeoIP.dat, which is a comma delimited file which has the information it needs.

我有一个包含API的jar文件，以及一个实例化类并使用它的包装类。我的想法是将GeoIP.dat文件打包到jar文件中，然后将其作为jar文件中的资源进行访问。问题是，我不知道如何构造构造函数可以使用的路径。

I have a jar file which contains the API, as well as a wrapping class which instantiates the class and uses it. My idea is to package the GeoIP.dat file into the jar, and then access it as a resource in the jar file. The issue is that I do not know how to construct a path that the constructor can use.

看看API，它们是如何加载文件的：

Looking at the API, this is how they load the file:

public LookupService(String databaseFile) throws IOException {
    this(new File(databaseFile));
}


public LookupService(File databaseFile) throws IOException {
    this.databaseFile = databaseFile;
    this.file = new RandomAccessFile(databaseFile, "r");
    init();
}

我只粘贴它，因为我不反对编辑API本身这项工作，如果有必要的话，但不知道如何我可以复制我这样的功能。理想情况下，我希望将它放入文件表单中，否则，编辑API将非常麻烦。

I only paste that because I am not averse to editing the API itself to make this work, if necessary, but do not know how I could replicate the functionality I as such. Ideally I'd like to get it into the file form, though, or else editing the API will be quite a chore.

这可能吗？

推荐答案

这适用于我。

假设你有一个包org.foo.bar .util包含GeoLiteCity.dat

Assuming you have a package org.foo.bar.util that contains GeoLiteCity.dat

URL fileURL = this.getClass().getResource("org/foo/bar/util/GeoLiteCity.dat");
File geoIPData = new File(fileURL.toURI());
LookupService cl = new LookupService(geoIPData, LookupService.GEOIP_MEMORY_CACHE );

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