DocumentBuilder.parse()是线程安全的吗?

private static final ThreadLocal<DocumentBuilder> builderLocal =
    new ThreadLocal<DocumentBuilder>() {
        @Override protected DocumentBuilder initialValue() {
            try {
                return
                    DocumentBuilderFactory
                        .newInstance(
                            "xx.MyDocumentBuilderFactory",
                            getClass().getClassLoader()
                        ).newDocumentBuilder();
            } catch (ParserConfigurationException exc) {
                throw new IllegalArgumentException(exc);
            }
        }
    };

(免责声明:与其说是试图编译代码,不如说是试图编译代码。)

DocumentBuilder上有一个reset()方法,可以将其恢复到最初创建时的状态。如果你要走本地路线,别忘了打电话,否则你会被水淹没。

您还可以检查此代码以进行进一步优化 https://svn.apache.org/repos/asf/shindig/trunk/java/common/src/main/java/org/apache/shindig/common/xml/XmlUtil.java