轉換文本文件，XML在java中

-5

1 
244699000 
52.467286666666666 
4.611188333333334

我想將其轉換爲XML文件，如下圖所示

<?xml version="1.0" encoding="ISO-8859-1"?> 
<SYSTEM-TRACKS> 
<AIS-SENSOR ID ="1"> 
    <MMSI>244699000 </MMSI> 
    <LATITUDE> 52.467286666666666 </LATITUDE> 
    <LONGITUDE> 4.611188333333334 </LONGITUDE> 
</AIS-SENSOR> 
</SYSTEM-TRACKS>

這裏是我發現的代碼

public class ToXML { 

BufferedReader in; 
StreamResult out; 

TransformerHandler th; 
AttributesImpl atts; 

public static void main(String args[]) { 
    new ToXML().doit(); 
} 

public void doit() { 
    try { 
     in = new BufferedReader(new FileReader("data")); 
     out = new StreamResult("data.xml"); 
     initXML(); 
     String str; 

     while ((str = in.readLine()) != null) { 

      process(str); 

     } 
     in.close(); 
     closeXML(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
} 

public void initXML() throws ParserConfigurationException, 
     TransformerConfigurationException, SAXException { 
    // JAXP + SAX 
    SAXTransformerFactory tf = (SAXTransformerFactory) SAXTransformerFactory 
      .newInstance(); 

    th = tf.newTransformerHandler(); 
    Transformer serializer = th.getTransformer(); 
    serializer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1"); 
    // pretty XML output 
    serializer.setOutputProperty(
      "{http://xml.apache.org/xslt}indent-amount", "4"); 
    serializer.setOutputProperty(OutputKeys.INDENT, "yes"); 
    th.setResult(out); 
    th.startDocument(); 
    atts = new AttributesImpl(); 
    th.startElement("", "", "SYSTEM-TRACKS", atts); 

} 

public void process(String s) throws SAXException { 
    String elements[] = s.split("\\r?\\n"); 
    atts.clear(); 

    th.startElement("", "", "AIS-SENSOR", atts); 
    th.characters(elements[0].toCharArray(), 0, elements[0].length()); 

    th.startElement("", "", "MMSI", atts); 
    th.characters(elements[1].toCharArray(), 0, elements[1].length()); 
    th.endElement("", "", "MMSI"); 

    th.startElement("", "", "LATITUDE", atts); 
    th.characters(elements[2].toCharArray(), 0, elements[2].length()); 
    th.endElement("", "", "LATITUDE"); 

    th.startElement("", "", "LONGITUDE", atts); 
    th.characters(elements[3].toCharArray(), 0, elements[3].length()); 
    th.endElement("", "", "LONGITUDE"); 

} 

public void closeXML() throws SAXException { 
    th.endElement("", "", "AIS-SENSOR"); 
    th.endElement("", "", "SYSTEM-TRACKS"); 
    th.endDocument(); 
}

}

但是，當我執行它我得到以下錯誤

java.lang.ArrayIndexOutOfBoundsException: 1 
at ToXML.process(ToXML.java:76) 
at ToXML.doit(ToXML.java:38) 
at ToXML.main(ToXML.java:26)

任何人都可以幫助我做出如上所示的正確的XML文件？

在此先感謝

來源

2012-02-27 user745475

ArrayIndexOutOfBoundsException異常：拋出以指示數組已被訪問wi非法索引。索引或者是負數，或者大於或等於數組的大小。 http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/IndexOutOfBoundsException.html – VirtualTroll 2012-02-27 15:06:20

爲什麼不使用調試器來自己縮小問題的範圍？（如果你不知道怎麼做，我非常建議你學習它，因爲它肯定比在這裏提問更快） – meriton 2012-02-27 15:09:22

看看第76行，它如何訪問外部大小的數組位置？（這是非常基本的，它不會傷害你突出顯示第76行，因爲我當然不會在編輯器中加載你的代碼來自己弄清楚） – KevinDTimm 2012-02-27 15:09:41

你調用過程從您的文件只是一個單一的線，然後嘗試通過新線分割。您的陣列可能長度爲1.

String tmp = ""; 
while ((str = in.readLine()) != null) 
{ 
    tmp += str; 
} 
process(tmp);

請嘗試此操作。

來源

2012-02-27 15:12:08 Thomas

這種方法只有在你有一個由四個值組成的單一組時纔會起作用，因爲他在'process'方法中沒有循環。 – Tudor 2012-02-27 15:16:06

你的方法很奇怪。您正逐行閱讀，然後用換行符分隔行，但每行只有一個值，因此您的拆分只會返回一個條目。我建議這種方法：

String str; 
    int counter = -1; 
    while ((str = in.readLine()) != null) { 
     counter++; 
     if(counter % 4 == 0) { 
      process1(str); // add AIS-SENSOR element 
      continue; 
     } 
     if(counter % 4 == 1) { 
      process2(str); // add MMSI element 
      continue; 
     } 
     if(counter % 4 == 2) { 
      process3(str); // add LATITUDE element 
      continue; 
     } 
     if(counter % 4 == 3) { 
      process4(str); // add LONGITUDE element and close AIS-SENSOR 
      continue; 
     }   
    }

counter跟蹤文件中的當前行。 process1中的每一個將根據相應行上的值添加不同的元素。

來源

2012-02-27 15:12:30 Tudor

首先在doit（）你從你的文件中讀取一行（這意味着打開你的第一個換行符）然後你要在linebreals上拆分read line。

所以分割總是會給一個長度爲1的數組，這會導致在使用索引1（數組中的第二個元素）時發生異常。

你的txt文件應該包含1行中的所有4行，看來你應該重寫你的代碼來處理txt文件。

來源

2012-02-27 15:13:00 meksor

閱讀文本文件轉換成XML這樣的：

void readXML(){ 
    File textFile=... 
    Scanner scanner= new Scanner(textFile); 
    ContentHandler xmlContentHandler xml=... 
    //make sure to startDocument() with xmlContentHandler 

    while (scanner.hasNext()){ 
     addStartNodeWithAttribute("AIS-SENSORD", scanner.next()); 

     //move these to a method and use a for loop i=0..<3 
     xmlContentHandler.startElement("","","MMSI",new AttributesImpl()); 
     String mmsi=scanner.next(); 
     contenthandler.characters(mmsi.toCharArray(), 0, mmsi.length()); 
     contenthandler.endElement("","","MMSI"); 

     xmlContentHandler.startElement("","","LATITUDE",new AttributesImpl()); 
     String lat=scanner.next(); 
     contenthandler.characters(lat.toCharArray(), 0, lat.length()); 
     contenthandler.endElement("","","LATITUDE"); 

     xmlContentHandler.startElement("","","LONGITUDE",new AttributesImpl()); 
     String long=scanner.next(); 
     contenthandler.characters(long.toCharArray(), 0, long.length()); 
     contenthandler.endElement("","","LONGITUDE"); 
    } 

    //make sure to endDocument() with xmlContentHandler 
}

來源

2012-02-27 15:35:07 Adrian

感謝您的建議... – user745475 2012-02-27 15:55:34

使用DOM：

DocumentBuilderFactory f = DocumentBuilderFactory.newInstance(); 
DocumentBuilder b = f.newDocumentBuilder(); 
DOMImplementation i = b.getDOMImplementation(); 
Document d = i.createDocument(null , null , null);

然後，就建立它添加節點：

d.appendChild(d.createElement(...) ...);

來源

2012-08-20 13:13:39 Benj

// This is the original coding with the necessary changes to make it work. 
// 1. Out destination is a FileWriter 
// 2. Read the 4 lines into an array. 
// 3. Process the array. 
//  [email protected] 
package com.my.package; 

import java.io.BufferedReader; 
import java.io.FileReader; 
import java.io.FileWriter; 

import javax.xml.parsers.ParserConfigurationException; 
import javax.xml.transform.OutputKeys; 
import javax.xml.transform.Transformer; 
import javax.xml.transform.TransformerConfigurationException; 
import javax.xml.transform.sax.SAXTransformerFactory; 
import javax.xml.transform.sax.TransformerHandler; 
import javax.xml.transform.stream.StreamResult; 

import org.xml.sax.SAXException; 
import org.xml.sax.helpers.AttributesImpl; 

/* 
* This program reads a 4 lines text file land creates an XML structure around 
* the raw data. The XML structure is then copied to an xml output file. 
*/ 
public class Txt2XML { 

    BufferedReader in; 
    StreamResult out; 

    TransformerHandler th; 
    AttributesImpl atts; 

    // Here's our entry point ... 
    public static void main(String args[]) { 
     new Txt2XML().doit(); 
    } 

    public void doit() { 
     try { 
      in = new BufferedReader(new FileReader("conf/testdata.txt")); 
      out = new StreamResult(new FileWriter("conf/testdata.xml")); 
      initXML(); 
      String str; 
      // declare an array that can contain 4 strings 
      String[] SArray=new String[4]; 
      int i = 0; 

      while ((str = in.readLine()) != null) { 
//    System.out.println("input line: " + str); 
       SArray[i]=str; 
       i++; 

      } 

      process(SArray); 

      in.close(); 
      closeXML(); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    public void initXML() throws ParserConfigurationException, 
      TransformerConfigurationException, SAXException { 
     // JAXP + SAX 
     SAXTransformerFactory tf = (SAXTransformerFactory) SAXTransformerFactory 
       .newInstance(); 

     th = tf.newTransformerHandler(); 
     Transformer serializer = th.getTransformer(); 
     serializer.setOutputProperty(OutputKeys.ENCODING, "ISO-8859-1"); 
     // pretty XML output 
     serializer.setOutputProperty(
       "{http://xml.apache.org/xslt}indent-amount", "4"); 
     serializer.setOutputProperty(OutputKeys.INDENT, "yes"); 
     th.setResult(out); 
     th.startDocument(); 
     atts = new AttributesImpl(); 
     th.startElement("", "", "SYSTEM-TRACKS", atts); 

    } 

    public void process(String[] elements) throws SAXException { 
//  System.out.println("number of elements: " + elements.length); 
     atts.clear(); 

     th.startElement("", "", "AIS-SENSOR", atts); 
     th.characters(elements[0].toCharArray(), 0, elements[0].length()); 

     th.startElement("", "", "MMSI", atts); 
     th.characters(elements[1].toCharArray(), 0, elements[1].length()); 
     th.endElement("", "", "MMSI"); 

     th.startElement("", "", "LATITUDE", atts); 
     th.characters(elements[2].toCharArray(), 0, elements[2].length()); 
     th.endElement("", "", "LATITUDE"); 

     th.startElement("", "", "LONGITUDE", atts); 
     th.characters(elements[3].toCharArray(), 0, elements[3].length()); 
     th.endElement("", "", "LONGITUDE"); 

    } 

    public void closeXML() throws SAXException { 
     th.endElement("", "", "AIS-SENSOR"); 
     th.endElement("", "", "SYSTEM-TRACKS"); 
     th.endDocument(); 
    } 
}

來源

2013-07-05 16:22:11

轉換文本文件，XML在java中

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