高防服务器读取jar包中resource文件夹下的文件154.223.64.2租用

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高防服务器读取jar包中resource文件夹下的文件154.223.64.2租用

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联系人：銳輝（香港）科技 敏敏
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前两天写了对医院端提供的接口，接口需要从数据库中主动抽取符合条件的数据，然后将数据替换到resource文件夹下已有的XML模板中，例如模板在resource文件夹的templete文件夹中，模板名称为publicTemplete.xml，刚开始使用了File file = ResourceUtils.getFile("classpath:templates/publicTemplete.xml")，然后将获取到的xml模板通过SAXReader解析成Document文件，在通过Document的asXML方法转换成字符串返回给调用者，代码如下：

private String returnXmlStr() throws FileNotFoundException, UnsupportedEncodingException, IOException {
        File file = ResourceUtils.getFile("classpath:templates/publicTemplete.xml");
        SAXReader reader = new SAXReader();
        Document doc = reader.read(file);               
        return doc.asXML();
}
上述代码在未发布成Jar包前通过eclipse启动springboot项目，是可以使用的，然而等到发布成Jar包后通过java -jar xxx.jar来启动时，控制台就会报异常：class path resource [templates/publicTemplete.xml] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/D:/ydhl/xxx。通过百度发现从Jar包中读取文件需要使用ClassPathResource类的getInputStream()方法来完成，代码如下：

private String returnXmlStr() throws FileNotFoundException, UnsupportedEncodingException, IOException {
        //此处如果用File file = Resource.getFile(filePath)会报异常：找不到文件
            Resource resource = new ClassPathResource("classpath:templates/publicTemplete.xml");
            InputStream is = resource.getInputStream();
            ByteArrayOutputStream result = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int length;
            while ((length = is.read(buffer)) != -1) {
                    result.write(buffer, 0, length);
            }
            return result.toString(StandardCharsets.UTF_8.name());
        }
再次通过java -jar xxx.jar启动Jar包，读取成功，特此记录下来，已备查寻和增加印象。


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