沉睡森林@漂在北京

    在利用digester處理XML文件時，讀取多個XML文件，代碼反復測試都出現錯誤。后來，經過幾個分鐘的查找，終于加入一段代碼讓程序跑通。代碼如下：
package com.example.demo2;
import java.io.File;
import org.apache.commons.digester.Digester;
public class DigesterDriver {
 public static void main(String[] args) {
  try {
   Digester digester = new Digester();
   File input = new File("E:\\MyProjects\\Workspace\\DigesterDemo\\src\\com\\example\\demo2\\example.xml");
   File input2 = new File("E:\\MyProjects\\Workspace\\DigesterDemo\\src\\com\\example\\demo2\\example2.xml");
   Catalog2 c = new Catalog2();
   digester.push(c);
   digester.setValidating(false);
   digester.addObjectCreate("catalog/hi/book", Book2.class);
   digester.addBeanPropertySetter("catalog/hi/book/author", "author");
   digester.addBeanPropertySetter("catalog/hi/book/title", "title");
   digester.addSetNext("catalog/hi/book", "addBook" );
   digester.parse(input);
   digester.push(c);
   digester.parse(input2);
   System.out.println(c.getBooks().size());
  } catch (Exception exc) {
   exc.printStackTrace();
  }
 }
}
    其中，紅色部分是后來加入的，仔細閱讀了struts的部分代碼，發現了這個錯誤。網上對這個介紹比較少，可能我這個問題比較弱智吧。struts的代碼片段如下：

        // Configure the Digester instance we will use
        Digester digester = initConfigDigester();

        // Process each specified resource path
        while (paths.length() > 0) {
            digester.push(config);
            String path = null;
            int comma = paths.indexOf(',');
            if (comma >= 0) {
                path = paths.substring(0, comma).trim();
                paths = paths.substring(comma + 1);
            } else {
                path = paths.trim();
                paths = "";
            }

            if (path.length() < 1) {
                break;
            }
           
            this.parseModuleConfigFile(prefix, paths, config, digester, path);
        }