@Test
public?void?testPerformance()?throws?Exception?{
????System.out.println("性能測試：");
????//測試DOM的性能
????long?start?=?System.currentTimeMillis();
????domXmlParser();
????System.out.println("DOM:"?+?(System.currentTimeMillis()?-?start));
????//測試SAX的性能
????start?=?System.currentTimeMillis();
????saxXmlParser();
????System.out.println("SAX:"?+?(System.currentTimeMillis()?-?start));
????//測試JDOM的性能
????start?=?System.currentTimeMillis();
????jdomXmlParser();
????System.out.println("JDOM:"?+?(System.currentTimeMillis()?-?start));
????//測試DOM4J的性能
????start?=?System.currentTimeMillis();
????dom4jXmlParser();
????System.out.println("DOM4J:"?+?(System.currentTimeMillis()?-?start));
}

上述的自定義的方法，測試結(jié)果如下：

idea生成測試類代碼如下：

public?class?ParseTestTest?{
????@org.junit.Test
????public?void?domXmlParser()?throws?Exception?{

????}

????@org.junit.Test
????public?void?saxXmlParser()?throws?Exception?{

????}

????@org.junit.Test
????public?void?jdomXmlParser()?throws?Exception?{

????}

????@org.junit.Test
????public?void?dom4jXmlParser()?throws?Exception?{

????}

}

運(yùn)行結(jié)果如下：

為什么idea生成的時(shí)間較短，而且除dom解析外其他解析沒時(shí)間或幾乎沒時(shí)間呢