Working with DOM4J XML (bottom)

Record some general usage of XPath, memo.

1 //3. XPath Understanding (used to select elements in XML, like jquery selectors)2                 //3.1 Path3Node Node1 = Root.selectsinglenode ("/person"); 4 System.out.println (Node1.asxml ());5                 6                 //3.2 "@" Select Node properties (take attributes generally with selectSingleNode)7Node node4 = Root.selectsinglenode ("//person"). selectSingleNode ("@name");8 System.out.println (Node4.asxml ());9             Ten                 //3.3 "[]" can be used as a filter or as subscript Onelist<node> nodes1 = Root.selectnodes ("//person[@cls! = ' 04 ']");//find node named person from current path and the CLS attribute value is not 04 A                  for(Node tmpnode:nodes1) -                 { - System.out.println (Tmpnode.asxml ()); the                 } -  　　　　　　　　　  //3.4 Summary: ---------Path------------------- -                     // "//Person ""//"indicates the start of the current node (ignoring the intermediate path) to find the node in the descendant node that has no person +                     // "//Persons//a "of two// -                     // "..                                  /.." Parent nodes of parent node +                     //"/person" from the root node (do not ignore the intermediate path, the first level to look down) ... Not only can not find, but also affect the execution of subsequent code.  A---------Filter AND operator------ at                     // "//Person[a] "//from the current path, node is named person and contains a child node -                     // "//person[@id] "//from the current path, node is named person and has an id attribute -                     // "//person[@age >=24] "=! = > >= < <= (but *=, $=, ^=, ~=, etc. are not supported) -                     // "//person[@age >=24 and @age <30] "and -                     // "//person[@age >=24][@age <30] "action Ibid. -                     // "//person[@age >26 or @age <20] "or in                     // "//Person[not (@age <25)] "non- -                     // "//Persons/dog |//Persons/person "Returns the set of two lists ("//Persons/dog and//Persons/person "does not reach such an effect) to----------Subscript------------ +  　　　　　　　　　　　　 // "//person[2] "takes the 2nd node in the matching node (subscript starting from 1) -  　　　　　　　　　　　　 // "//person[last ()-1] "Take the second from the bottom of the the  *-----------Wildcard characters----------- $  　　　　　　　　　　　　 // "//person/@name "matches the name of all person nodesPanax Notoginseng  　　　　　　　　　　　　 // "//Persons/person "matches all person child nodes under persons -  　　　　　　　　　　　　 // "//persons/* "wildcard character, matching all child nodes under persons-----------function----------------- the  　　　　　　　　　　　　 //"/node ()" matches all nodes under the root node (including text nodes and note nodes) (Note the difference from "/*" ) +  　　　　　　　　　　　　 // "//Dog/text () "matches the text under the dog node A  　　　　　　　　　　　　 // "//Child::node () "Recursively all descendant nodes (containing text nodes and comment nodes) starting at the current position the  　　　　　　　　　　　　 // "//Child ::* "recursively all descendant nodes starting from the current position +  ---------------------------with namespaces $  　　　　　　　　　　　　 // "//namespace::* "Output all the namespace, there are duplicates!  $  　　　　　　　　　　　　 // "//*[local-name () = ' person '] "matches the node local-name for person, such as???:p Erson -  　　　　　　　　　　　　 // "//Mt:person "Just take the namespace. -  　　　　　　　　　　　　 //"/cumt:classes/mc:persons/mt:person"

Note: descendant nodes and child nodes are not the same thing, descendant nodes also include child nodes of child nodes ...

Working with DOM4J XML (bottom)