（轉載）XML字符串格式化

轉載自：http://blog.sina.com.cn/s/blog_5de427510100brr5.html

功能：對xml字符串進行格式化

依賴包：dom4j

import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;


import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;


   
    public static String format(String str) throws IntercommunionUtilException {

        StringReader in=null;
        StringWriter out=null;
        try{
            SAXReader reader=new SAXReader();
            //創建一個串的字符輸入流
            in=new StringReader(str);
            Document doc=reader.read(in);
            //創建輸出格式
            OutputFormat formate=OutputFormat.createPrettyPrint();
            //創建輸出
            out=new StringWriter();
            //創建輸出流
            XMLWriter writer=new XMLWriter(out,formate);
            //輸出格式化的串到目標中,格式化後的串保存在out中。
            writer.write(doc);
        } catch (IOException ioe){
            throw new IntercommunionUtilException("對xml字符串進行格式化時產生IOException異常",ioe);    
        } catch (DocumentException de){
            throw new IntercommunionUtilException("對xml字符串進行格式化時產生DocumentException異常",de);
        } finally{
            //關閉流
            quietClose(in);
            quietClose(out);
        }
        return out.toString();
      }    
    
   
    public static void quietClose(Reader reader){
        try{
            if(reader!=null){
                reader.close();
            }
        } catch(IOException ioe){
            logger.error("關閉Reader時出現異常", ioe);   
        }

    }

   
    public static void quietClose(Writer writer){
        try{
            if(writer!=null){
                writer.close();
            }
        } catch(IOException ioe){
            logger.error("關閉Writer時出現異常", ioe);
        }
    }