使用Groovy XmlParser 解析XML示例

红太狼 2022-07-16 08:38 212阅读 0赞

如果你使用过java（不管你是用DOM、或者SAX、JDOM、DOM4J）来解析或者生成xml，那么相比较而言，使用Groovy生成和解析xml就比较容易。

下面单刀直入。  
xml文件

<?xml version="1.0" encoding="UTF-8"?>  
    <books version="1.0.1" exportDate="2016-10-10 12:30:50">
      <comments>This is for groovy xml parse demo</comments>
      <operator role="admin">root</operator>
      <data>
        <book bookid="1" mark="001m">
          <name>Netty in action</name>
          <price>35</price>
        </book>
        <book bookid="2" mark="002m">
          <name>MyCat in action</name>
          <price>25</price>
        </book>
        <book bookid="3" mark="003m">
          <name>MINA in action</name>
          <price>4</price>
        </book>
        <book bookid="4">
          <name>The Definitive Guide to SQLite</name>
          <price>50</price>
          <position url="http://www.jd.com">  
             <property name="prop1">value01</property>
             <property name="prop2">value02</property>
          </position>
        </book>
      </data>
    </books>

Groovy代码  
（你可以很容地将文件转为string。 解析文件使用def books = new XmlParser().parse(“books.xml”);， 解析文本使用def books= new XmlParser().parseText(xmlText)）

注释：整个代码比较简单，就不一一解释了。

class XmlParseDemo {
        public static main(def args){
            def books = new XmlParser().parse("books.xml");
            def booksData = books.data;
    
            def version = books.attributes().get("version");
            def exportDate = books.attributes().get("exportDate");
            def externalMsgVer = "version:[" + version + "] exportDate:[" + exportDate +"]"
            println externalMsgVer;
            println ""
    
            def attrs = books.attributes()
            println "books element all attributes"
            attrs.each { it ->
                println  "attributeName:[" + it.key + "], value:[" + it.value +"]"
            }
            println ""
    
            String comments = books.comments.text();
            //it is necessary to use books.operator[0] for specify the first operator element expressly
            String operatorRole = books.operator[0].attributes().get("role");
            String operatorNull = books.operator[0].attributes().get("NotExist");
            String operator = books.operator.text();
            def externalMsg1 = "comments:[" + comments + "] operatorRole:[" + operatorRole
            def externalMsg2 = externalMsg1 + "] operator:[" + operator + "] NotExist:[" + operatorNull +"]"
            println externalMsg2;
    
            int count = 0;
            books.data.book.each {
                def bookid = it.attributes().get("bookid");
                def bookid2 = it.'@bookid';
                def mark = it.attributes().get("mark");
    
                String name = it.name[0].text();
                String price = it.price[0].text();
    
                def message = "bookid:[" + bookid + "]-[" + bookid2+ "] mark:[" + mark + "] name:[" + name + "] price:[" + price +"]"
                println message;
                if (it.position[0] != null) {
                    def properties = it.position[0].property;
                    properties.each {  
                       println "-------------------"  
                       println it.'@name';  
                       println it.text();  
                       println "-------------------"  
                    }  
                }
    
                count++;
            }
    
            println "Total books number is " + count
            println ""
    
            println "book element is accessed by array index"
            def specificBook = books.data.book[3];
            String tempName = specificBook.name[0].text();
            println "book[3] name is " + tempName
    
        }
    }

运行结果  
version:\[1.0.1\] exportDate:\[2016-10-10 12:30:50\]

books element all attributes  
attributeName:\[version\], value:\[1.0.1\]  
attributeName:\[exportDate\], value:\[2016-10-10 12:30:50\]

comments:\[This is for groovy xml parse demo\] operatorRole:\[admin\] operator:\[root\] NotExist:\[null\]  
bookid:\[1\]-\[1\] mark:\[001m\] name:\[Netty in action\] price:\[35\]  
bookid:\[2\]-\[2\] mark:\[002m\] name:\[MyCat in action\] price:\[25\]  
bookid:\[3\]-\[3\] mark:\[003m\] name:\[MINA in action\] price:\[4\]

## bookid:\[4\]-\[4\] mark:\[null\] name:\[The Definitive Guide to SQLite\] price:\[50\] ##

prop1

## value01 ##

--------------------

prop2

## value02 ##

Total books number is 4

book element is accessed by array index  
book\[3\] name is The Definitive Guide to SQLite

截图  
![这里写图片描述][20161012091217722]

[20161012091217722]: /images/20220716/0beee65a4fd34bcb88c775308373e709.png