創建換行符

Question

我提到了下面的教程使用Java創建XML文件的XML文件。 http://www.mkyong.com/java/how-to-create-xml-file-in-java-dom/

但是，當我打開xml文件時，它出現在1個極長的單行中。這使得我很難覈實的結果，我相信這是可能的對每一個元素標籤的換行符。 但我沒有任何線索如何做到這一點。請指教。 以下是我的代碼：

/* 
* To change this template, choose Tools | Templates 
* and open the template in the editor. 
*/ 
package ir; 
import java.io.BufferedReader; 
import java.io.FileNotFoundException; 
import java.io.FileReader; 
import java.io.IOException; 

import java.io.File; 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.ParserConfigurationException; 
import javax.xml.transform.Transformer; 
import javax.xml.transform.TransformerException; 
import javax.xml.transform.TransformerFactory; 
import javax.xml.transform.dom.DOMSource; 
import javax.xml.transform.stream.StreamResult; 

import org.w3c.dom.Attr; 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 

//############################################################################################################## 
public class IR { 

    public static void main(String[] args) { 

     IR obj = new IR(); 
    obj.Reader(); 


    }//end main 

//############################################################################################################## 
    public void Reader() { 

    String csvFile = "TWEETS.csv"; 
    BufferedReader br = null; 
    String line = ""; 
    String cvsSplitBy = ","; 
     String[] heading = {};   //The headings (E.g. ID, Message, Link) 
     String[] content = {};   
     int counter = 0;    //Num of columns 
     boolean isheading = true;  //First line is heading 

    try 
     { 
      //############################################################################################################## 
      DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); 
      DocumentBuilder docBuilder = docFactory.newDocumentBuilder(); 

      // <add> elements 
      Document doc = docBuilder.newDocument(); 
      Element rootElement = doc.createElement("add"); 
      doc.appendChild(rootElement); 
      //############################################################################################################## 

      br = new BufferedReader(new FileReader(csvFile)); 
      while ((line = br.readLine()) != null) 
      { 

        //The first line is heading 
        if(isheading) 
        { 
         //The headings (E.g. ID, Message, Link) 
         heading = line.split(cvsSplitBy); 
         counter = heading.length;  //get number of columns 
         isheading = false;    
         continue;      //Go to next loop 
        }else{ //2nd line onwards 
         content = line.split(cvsSplitBy); 
         System.out.println("SG News " 
          + "[ID= " + content[0] 
          + " , FULL_MESSAGE=" + content[1] + "]"); 
        } 

        //############################################################################################################## 
        // <doc> elements 
        Element docEle = doc.createElement("doc"); 
        rootElement.appendChild(docEle);       

         //Loop according to number of columns 
         for(int i=0; i<counter; i++) 
         { 
          // <field> elements 
          Element fieldEle = doc.createElement("field"); 
          rootElement.appendChild(fieldEle); 

          // set attribute to <field> element 
          Attr attr = doc.createAttribute("name"); 
          attr.setValue(heading[i]); 
          fieldEle.setAttributeNode(attr); 
          fieldEle.appendChild(doc.createTextNode(content[i])); 
         } 
        //############################################################################################################## 

      } 
      //############################################################################################################## 
      // write the content into xml file 
      TransformerFactory transformerFactory = TransformerFactory.newInstance(); 
      Transformer transformer = transformerFactory.newTransformer(); 
      DOMSource source = new DOMSource(doc); 
      StreamResult result = new StreamResult(new File("TWEETs_solr.xml")); 

      // Output to console for testing 
      transformer.transform(source, result); 

      System.out.println("File saved!"); 
      //############################################################################################################## 
    }catch (ParserConfigurationException pce) { 
     pce.printStackTrace(); 
    }catch (TransformerException tfe) { 
     tfe.printStackTrace(); 
    }catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    }catch (IOException e) { 
     e.printStackTrace(); 
    }finally { 
      if (br != null) 
      { 
       try { 
         br.close(); 
       } catch (IOException e) { 
         e.printStackTrace(); 
       } 
      } 
    } 
    System.out.println("Done"); 

    }//end Reader 
//############################################################################################################## 


}//end class 

Answer 1

您需要爲變壓器對象添加屬性。 像這樣：

Transformer transformer = transformerFactory.newTransformer(); 
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); 
transformer.setOutputProperty(OutputKeys.INDENT, "yes"); 

它應該做的伎倆。