如何在Java中合并两个XML [英] How to Merge two XMLs in Java

问题描述

我正在尝试在Java中合并两个xmls。我正在使用STaX API来编写这些XML。我在互联网上搜索了很多关于如何合并xmls的内容，但似乎没有像 C＃那样直截了当。有没有直接的方法在Java中使用StAX执行此操作？可能xslt不是正确的解决方案，因为文件大小可能很大。

I am trying to merge two xmls in Java. I am using STaX API to write these XMLs. I searched a lot on internet on how to merge xmls but none seems as straight forward as C#. Is there any straight-forward way of doing this in Java using StAX? Probably xslt would not be the right solution since the file size can be big.

File1.xml

File1.xml

<TestCaseBlock>
    <TestCase TestCaseID="1">
        <Step ExecutionTime="2011-03-29 12:08:31 EST">
            <Status>Passed</Status>
            <Description>foo</Description>
            <Expected>foo should pass</Expected>
            <Actual>foo passed</Actual>
        </Step>
       </TestCase>
</TestCaseBlock> 

File2.xml

File2.xml

<TestCaseBlock>
    <TestCase TestCaseID="2">
        <Step ExecutionTime="2011-03-29 12:08:32 EST">
            <Status>Failed</Status>
            <Description>test something</Description>
            <Expected>something expected</Expected>
            <Actual>not as expected</Actual>
        </Step>
    </TestCase>
</TestCaseBlock>

Merged.xml

Merged.xml

<TestCaseBlock>
<TestCase TestCaseID="1">
    <Step ExecutionTime="2011-03-29 12:08:33 EST">
        <Status>Passed</Status>
        <Description>foo</Description>
        <Expected>foo should pass</Expected>
        <Actual>foo passed</Actual>
    </Step>
</TestCase>
<TestCase TestCaseID="2">
    <Step ExecutionTime="2011-03-29 12:08:34 EST">
        <Status>Failed</Status>
        <Description>test something</Description>
        <Expected>something expected</Expected>
        <Actual>not as expected</Actual>
    </Step>
</TestCase>
</TestCaseBlock>

推荐答案

我有一个适合我的解决方案。现在专家，请告知这是否可行。

I have a solution that works for me. Now experts, please advise if this is the way to go.

谢谢，
-Nilesh

Thanks, -Nilesh

    XMLEventWriter eventWriter;
    XMLEventFactory eventFactory;
    XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
    XMLInputFactory inputFactory = XMLInputFactory.newInstance();
    eventWriter = outputFactory.createXMLEventWriter(new FileOutputStream("testMerge1.xml"));
    eventFactory = XMLEventFactory.newInstance();
    XMLEvent newLine = eventFactory.createDTD("\n");                
    // Create and write Start Tag
    StartDocument startDocument = eventFactory.createStartDocument();
    eventWriter.add(startDocument);
    eventWriter.add(newLine);
    StartElement configStartElement = eventFactory.createStartElement("","","TestCaseBlock");
    eventWriter.add(configStartElement);
    eventWriter.add(newLine);
    String[] filenames = new String[]{"test1.xml", "test2.xml","test3.xml"};
    for(String filename:filenames){
           XMLEventReader test = inputFactory.createXMLEventReader(filename,
                             new FileInputStream(filename));
        while(test.hasNext()){
            XMLEvent event= test.nextEvent();
        //avoiding start(<?xml version="1.0"?>) and end of the documents;
        if (event.getEventType()!= XMLEvent.START_DOCUMENT && event.getEventType() != XMLEvent.END_DOCUMENT)
                eventWriter.add(event);         
        eventWriter.add(newLine);
            test.close();
        }           
    eventWriter.add(eventFactory.createEndElement("", "", "TestCaseBlock"));
    eventWriter.add(newLine);
    eventWriter.add(eventFactory.createEndDocument());
    eventWriter.close();

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