XStream アンダースコアを含むタグのＸＭＬ出力、

Java

XStreamは、アンダースコアを含むタグをダブらせて、、２個のアンダースコアにしてしまう！！そういう仕様で規則だ。
これを避けるには、

XStream インスタンス生成を、

       Stream stream = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("_-", "_"));

でということだが、問題があって、、、

これと、CDATAセクションを書くようにする方法を

     new DomDriver("UTF-8", new XmlFriendlyNameCoder("_-", "_")){
        public HierarchicalStreamWriter createWriter(Writer out){
         return new PrettyPrintWriter(writer){
            protected void writeText(QuickWriter w, String text){
               if (text.indexOf("<") >= 0
                     || text.indexOf(">") >= 0
                     || text.indexOf("&") >= 0
                     || text.indexOf("!") >= 0
                     || text.indexOf("'") >= 0
                     || text.indexOf("\"") >= 0
                  ){
                  w.write("<![CDATA[");
                  w.write(text);
                  w.write("]]>");
               }else{
                  w.write(text);
               }
            }
         };
      }
    }

と書いてしまうと、CDATA セクションのwriter が優先されて、相変わらず、ダブルのアンダースコアになってしまう！！

しかたなく、XppDriver または DomDriver 継承クラスを準備して以下のものを用意して使う。

import java.io.OutputStreamWriter;
import java.io.Writer;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.DomDriver;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;

/**
 * CdataDomDriver.
 */
public final class CdataDomDriver extends DomDriver{
   private OutputStreamWriter outwriter;
   /**
    * コンストラクタ.
    * @param writer OutputStreamWriter
    */
   public CdataDomDriver(OutputStreamWriter writer){
      super("UTF-8", new XmlFriendlyNameCoder("_-", "_"));
      outwriter = writer;
   }
   @Override
   public HierarchicalStreamWriter createWriter(Writer out){
      return new PrettyPrintWriter(outwriter, new XmlFriendlyNameCoder("_-", "_")){
         protected void writeText(QuickWriter writer, String text){
            if (text.indexOf("<") >= 0
               || text.indexOf(">") >= 0
               || text.indexOf("&") >= 0
               || text.indexOf("!") >= 0
               || text.indexOf("'") >= 0
               || text.indexOf("\"") >= 0
            ){
               writer.write("<![CDATA[");
               writer.write(text);
               writer.write("]]>");
            }else{
               writer.write(text);
            }
         }
      };
   }
}

あるいは、、、

import java.io.OutputStreamWriter;
import java.io.Writer;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;
import com.thoughtworks.xstream.io.xml.XppDriver;

/**
 * CdataXppDriver.
 */
public final class CdataXppDriver extends XppDriver{
   private OutputStreamWriter outwriter;
   /**
    * コンストラクタ.
    * @param writer OutputStreamWriter
    */
   public CdataXppDriver(OutputStreamWriter writer){
      super(new XmlFriendlyNameCoder("_-", "_"));
      outwriter = writer;
   }
   @Override
   public HierarchicalStreamWriter createWriter(Writer out){
      return new PrettyPrintWriter(outwriter, new XmlFriendlyNameCoder("_-", "_")){
         protected void writeText(QuickWriter writer, String text){
            if (text.indexOf("<") >= 0
               || text.indexOf(">") >= 0
               || text.indexOf("&") >= 0
               || text.indexOf("!") >= 0
               || text.indexOf("'") >= 0
               || text.indexOf("\"") >= 0
            ){
               writer.write("<![CDATA[");
               writer.write(text);
               writer.write("]]>");
            }else{
               writer.write(text);
            }
         }
      };
   }
}


そして、、、

try(OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream("out.xml"), "UTF-8")){
   writer.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");

   XStream stream = new XStream(new CdataXppDriver(writer));

とする。