StAX

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Streaming API for XML (StAX) is an application programming interface (API) to read and write XML documents, originating from the Java programming language community.

下面是IBM的关于StAX的文章，大家可以参考一下。

http://www.ibm.com/developerworks/library/x-stax1/index.html

然后是一个简单的例子。

以下面这个xml为例：

<?xml version="1.0"?>
<company>
   <staff>
       <firstname>yong</firstname>
       <lastname>mook kim</lastname>
       <nickname>mkyong</nickname>
       <salary>100000</salary>
       <salary1>111111</salary1>
   </staff>
   <staff>
       <firstname>low</firstname>
       <lastname>yin fong</lastname>
       <nickname>fong fong</nickname>
       <salary>200000</salary>
   </staff>
</company>

代码：

从代码中可以看到StAX并没有使用什么特殊类。

package markey.testng;

import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URL;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;

/**
* This program demonstrates how to use a StAX parser. The program prints all
* hyperlinks links of an XHTML web page. <br>
* Usage: java StAXTest url
*
* @author Cay Horstmann
* @version 1.0 2007-06-23
*/
public class STAXTesting {
    public static void main(String[] args) throws Exception {
        InputStream in = new FileInputStream("d:/book/file.xml");
        XMLInputFactory factory = XMLInputFactory.newInstance();
        XMLStreamReader parser = factory.createXMLStreamReader(in);

        boolean dosStart = false;
        String doc = "

//StAX提供了这个迭代器，通过wrap这个迭代器，我们可以方便的控制什么时候读取XML的下一行。

        while (parser.hasNext()) {
            int event = parser.next();

            if (event == XMLStreamConstants.START_ELEMENT) {
                if (parser.getLocalName().equals("staff")) {
                    dosStart = true;
                    doc = "";
                    continue;
                }
            }else if (event == XMLStreamConstants.END_ELEMENT) {
                    if (parser.getLocalName().equals("staff")) {
                        dosStart = false;
                        System.out.println(doc);
                        continue;
                    }
            }

            if (dosStart == true && event == XMLStreamConstants.START_ELEMENT) {
                        doc += parser.getLocalName() + ":"
                                + parser.getElementText() + ";";
                        continue;
            }
    }
}
}