DocumentHelper用法

public static void main(Stringargs[]){

Strings="<?xml version=\"1.0\" encoding=\"gbk\"?>" +

"<smartresult>" +

"<product type=\"identitycard\">" +

"<code>440305198012255411</code>" +

"<location>sdfsdf</location>" +

"<birthday>19801225</birthday>" +

"<gender>m</gender></product>" +

"</smartresult>";

try {

Document doc = DocumentHelper.parseText(s);

Node root=doc.getRootElement();

System.out.println(root.getName());

} catch (Exception e) {

e.printStackTrace();

}

}

一、DocumentHelper类的主要静态方法：

1.parseText

publicstatic Document parseText(String text)

throws DocumentException

parseText parses the given text as an XML document and returns the newlycreated Document.

Parameters:

text - the XML text to be parsed

Returns:

a newly parsed Document

Throws:

DocumentException - if the documentcould not be parsed

二、Document接口的主要方法：

1.getRootElement

publicElement getRootElement()

Returns the root Element for this document.

Returns:

the root element for this document

三、Element接口的主要方法：

1.getText(这个是element接口的方法)

返回当前元素的文本内容，如果元素没有文本内容，则返回空。

publicString getText()

Returns the text value of this element without recursing through childelements. This method iterates through all Text,CDATA and Entitynodes that thiselement contains and

appendsthe text values together.

Specified by:

getText in interface Node

Returns:

the textual content of this Element.Child elements are not navigated. This method does not return null;

2.getName（这个是node接口的方法，由于element继承node，所有，element也可以调用该方法）

publicString getName()

getName returns the name of this node. This is the XML local name of theelement, attribute, entity or processing instruction. For CDATA and Text nodesthis method will

returnnull.

Returns:

the XML name of this node

四、Document类的继承结构

public interface Document

extends Branch

publicinterface Branch

extends Node

Document接口继承Branch，Branch接口又继承Node接口，而Node接口有个方法，经常用到如下：

List<Node>selectNodes(String xpathExpression)

selectNodesevaluates an XPath expression and returns the result as a List of Nodeinstances or String instances depending on the XPath expression.

Parameters:

xpathExpression - is the XPath expression to be evaluated

Returns:

the list of Node or String instances depending on the XPath expression