我们有一个场景,我们需要在小块中拆分大小超过10GB的大型xml文件.每个块应包含100或200个元素.示例xml
<Employees>
<Employee id="1">
<age>29</age>
<name>Pankaj</name>
<gender>Male</gender>
<role>Java Developer</role>
</Employee>
<Employee id="3">
<age>35</age>
<name>Lisa</name>
<gender>Female</gender>
<role>CEO</role>
</Employee>
<Employee id="3">
<age>40</age>
<name>Tom</name>
<gender>Male</gender>
<role>Manager</role>
</Employee>
<Employee id="3">
<age>25</age>
<name>Meghna</name>
<gender>Female</gender>
<role>Manager</role>
</Employee>
<Employee id="3">
<age>29</age>
<name>Pankaj</name>
<gender>Male</gender>
<role>Java Developer</role>
</Employee>
<Employee id="3">
<age>35</age>
<name>Lisa</name>
<gender>Female</gender>
<role>CEO</role>
</Employee>
<Employee id="3">
<age>40</age>
<name>Tom</name>
<gender>Male</gender>
<role>Manager</role>
</Employee>
</Employees>
我有Stax解析器代码,它将文件分成小块.但是每个文件只包含一个完整的Employee元素,我需要100或200或更多< Employee>单个文件中的元素.这是我的java代码
public static void main(String[] s) throws Exception{
String prefix = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"+"\n";
String suffix = "\n</Employees>\n";
int count=0;
try {
int i=0;
XMLInputFactory xif = XMLInputFactory.newInstance();
XMLStreamReader xsr = xif.createXMLStreamReader(new FileReader("D:\\Desktop\\Test\\latestxml\\test.xml"));
xsr.nextTag(); // Advance to statements element
TransformerFactory tf = TransformerFactory.newInstance();
Transformer t = tf.newTransformer();
while(xsr.nextTag() == XMLStreamConstants.START_ELEMENT) {
File file = new File("C:\\Users\\test\\Desktop\\xml\\"+"out" +i+ ".xml");
FileOutputStream fos=new FileOutputStream(file,true);
t.transform(new StAXSource(xsr),new StreamResult(fos));
i++;
}
} catch (Exception e) {
e.printStackTrace();
}
解决方法
不要在每次迭代时使用i,当迭代次数达到100或200时,应该使用最新计数进行更新
喜欢：
String outputPath = "/test/path/foo.txt";
while(xsr.nextTag() == XMLStreamConstants.START_ELEMENT) {
FileOutputStream file = new FileOutputStream(outputPath,true);
...
...
count ++;
if(count == 100){
i++;
outputPath = "/test/path/foo"+i+"txt";
count = 0;
}
}
