java - Crawler4j ImageCrawler 字符串参数

Question

我正在尝试启动crawler4j示例: crawler4j

当我启动 ImageCrawlController 时，第一步 args.length < 3 就失败了，因为它是 0。我如何确保 args 大于 3？

public class ImageCrawlController {
  public static void main(String[] args) throws Exception {
    if (args.length < 3) {
      System.out.println("Needed parameters: ");
      System.out.println("\t rootFolder (it will contain intermediate crawl data)");
      System.out.println("\t numberOfCralwers (number of concurrent threads)");
      System.out.println("\t storageFolder (a folder for storing downloaded images)");
      return;
    }
  }
}

Answer 1

'... how can I put a value in the main-function for args? The main-function always starts with args = 0.'

在 Eclipse 中:运行 -> 运行配置。在左侧菜单中选择 Java 应用程序。现在选择选项卡:参数。

您可以调用他们:System.out.println(args[1]); ///<-2