怎么使用java导出大数据为xml文件_教程

dom4j可以试试，不知道你的数据量有多大，如果太大的话，我没试过

xml文件是有规律的，你可以把要导出的数据构造一下，

我有个简单的代码

package com.test.xml

import java.io.FileWriter

import java.io.IOException

import java.io.Writer

import org.dom4j.Document

import org.dom4j.DocumentHelper

import org.dom4j.Element

import org.dom4j.io.OutputFormat

import org.dom4j.io.XMLWriter

public class Dom4JXML {

public void createXML() {

//用工厂类创建一个document实例

Document doc = DocumentHelper.createDocument()

//创建根元素emps

Element rootEle = doc.addElement("emps")

//添加注释

rootEle.addComment("这是一个dom4j生成的xml文件")

//emps根节点下创建一个emp节点

Element empEle = rootEle.addElement("emp")

//emp添加属性id="1"

empEle.addAttribute("id", "1")

//emp节点下创建一个name节点

Element nameEle = empEle.addElement("name")

//name节点下创建一个文本节点zhangsan

nameEle.setText("zhangsan")

//再为name节点创建一个兄弟节点

Element sexEle = empEle.addElement("sex")

sexEle.setText("man")

//将document中的内容写入文件中

try {

Writer out = new FileWriter("F:\\emps.xml")

//格式化输出,类型IE浏览一样

OutputFormat format = OutputFormat.createPrettyPrint()

//OutputFormat format = OutputFormat.createCompactFormat()

format.setEncoding("UTF-8")

//创建写出对象

XMLWriter writer = new XMLWriter(out,format)

writer.write(doc)

writer.close()

System.out.println("生成emps.xml成功。")

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace()

System.out.println("失败了。")

}

public static void main(String[] args) {

new Dom4JXML().createXML()

}

然而从xml文件中解析以后的数据收集可以用SAX试试看

我这里有个简单的例子

package com.test.xml

import org.xml.sax.Attributes

import org.xml.sax.SAXException

import org.xml.sax.helpers.DefaultHandler

public class SAXParseHandler extends DefaultHandler{

public void startDocument()throws SAXException{

System.out.println("起始文挡")

}

public void endDocument()throws SAXException{

System.out.println("结束文挡")

}

public void characters(char[] ch,int start,int length)throws SAXException{

String charString=new String(ch,start,length)

System.out.println("字符:"+charString)

}

public void startElement(String namespaceURI,String localName,String qName,Attributes atts)throws SAXException{

System.out.println("起始元素:"+qName)

for(int i=0i<atts.getLength()i++){

System.out.println("属性值:"+atts.getValue(i))

}

public void endElement(String namespaceURI,String localName,String qName)throws SAXException{

System.out.println("结束元素:"+qName)

}

package com.test.xml

import javax.xml.parsers.SAXParser

import javax.xml.parsers.SAXParserFactory

public class Books {

/**

* @param args

public static void main(String[] args) throws Exception{

// TODO 自动生成方法存根

SAXParserFactory factory=SAXParserFactory.newInstance()

SAXParser parser=factory.newSAXParser()

parser.parse("booksamp.xml",new SAXParseHandler())

}

txt文件格式如下，采用的是一个服务端tomcat的log日志

[06/Mar/2013:18:43:55] 110.110.1.1 GET /rest/keyword/getallids/aid/3/os/android2.3.5/ver/1.0/ HTTP/1.1 200 210 1453 1.453 'Dalvik/1.4.0 (Linux U Android 2.3.5 T550 Build/MocorDroid2.3.5)'

[06/Mar/2013:18:43:55] 110.110.1.1 GET /rest/keyword/getallids/aid/3/os/android2.3.4/ver/1.0/ HTTP/1.1 200 210 1453 1.453 'Dalvik/1.4.0 (Linux U Android 2.3.4 LG-E730 Build/GRJ22)'

[06/Mar/2013:18:43:55] 110.110.1.1 GET /rest/keyword/getallids/aid/3/os/android2.3.5/ver/1.0/ HTTP/1.1 200 210 1453 1.453 'Dalvik/1.4.0 (Linux U Android 2.3.5 MI-ONE Plus Build/GINGERBREAD)'

[06/Mar/2013:18:43:55] 110.110.1.1 GET /rest/keyword/getallids/aid/3/os/android2.3.6/ver/1.0/ HTTP/1.1 200 210 1453 1.453 'Dalvik/1.4.0 (Linux U Android 2.3.6 GT-I9220 Build/GINGERBREAD)'

[06/Mar/2013:18:43:55] 110.110.1.1 POST /rest/keyword/getallids/aid/3/os/android4.0.3/ver/1.0/ HTTP/1.1 200 210 1469 1.469 'Dalvik/1.6.0 (Linux U Android 4.0.3 HUAWEI C8812 Build/HuaweiC8812)'

[06/Mar/2013:18:43:55] 110.110.1.1 GET /rest/keyword/getallids/aid/3/os/android2.2.2/ver/1.0/ HTTP/1.1 200 210 1453 1.453 'Dalvik/1.2.0 (Linux U Android 2.2.2 HUAWEI T8300 Build/FRF91)'

[06/Mar/2013:18:43:55] 110.110.1.1 GET /rest/keyword/getallids/aid/3/os/android2.3.6/ver/1.0/ HTTP/1.0 200 210 1484 1.484 'Dalvik/1.4.0 (Linux U Android 2.3.6 Mytel Build/GRK39F)'

[06/Mar/2013:18:43:55] 110.110.1.1 POST /rest/keyword/getallids/aid/3/os/android4.1.1/ver/1.0/ HTTP/1.1 200 210 1406 1.406 'Dalvik/1.6.0 (Linux U Android 4.1.1 GT-N7100 Build/JRO03C)'

转换代码如下

package test

import java.io.BufferedReader

import java.io.File

import java.io.FileReader

import java.io.FileWriter

import java.io.IOException

import java.io.Writer

import org.dom4j.Document

import org.dom4j.DocumentHelper

import org.dom4j.Element

import org.dom4j.io.XMLWriter

public class promble04 {

@SuppressWarnings("resource")

public static void txtToXML(String txtPath) throws IOException

{

File file = new File(txtPath)

Document document = DocumentHelper.createDocument()

Element list = document.addElement("list")

BufferedReader br = new BufferedReader(new FileReader(file))

String line = br.readLine()

while(line!=null)

{

String temp[] = line.split(" ")

Element log = list.addElement("log")

Element time = log.addElement("time")

Element ip = log.addElement("ip")

Element httpType = log.addElement("httpType")

Element url = log.addElement("url")

Element httplevel = log.addElement("httplevel")

Element linuxVersion = log.addElement("linuxVersion")

Element os = log.addElement("os")

Element AndroidVersion = log.addElement("AndroidVersion")

Element phoneType = log.addElement("phoneType")

for(int i = 0i<temp.lengthi++)

{

time.setText(temp[0])

ip.setText(temp[1])

httpType.setText(temp[2])

url.setText(temp[3])

httplevel.setText(temp[4])

linuxVersion.setText(temp[9])

os.setText(temp[10])

AndroidVersion.setText(temp[12])

phoneType.setText(temp[13])

}

line = br.readLine()

}

Writer filewriter = new FileWriter("D:\\log\\test.xml")

XMLWriter xmlWriter = new XMLWriter(filewriter)

xmlWriter.write(document)

xmlWriter.close()

}

public static void main(String args[]) throws IOException

{

promble04.txtToXML("D:\\log\\test.txt")

}

转换结果如下

<?xml version="1.0" encoding="UTF-8"?>

<list>

<log>

<url>/rest/keyword/getallids/aid/3/os/android2.3.5/ver/1.0/</url>

<linuxVersion>'Dalvik/1.4.0</linuxVersion>

<os>(Linux</os>