如何使用XPath提取xml文档数据

本文实例为大家分享了xpath提取xml文档数据具体代码，供大家参考，具体内容如下

import java.util.list;
 
import org.dom4j.document;
import org.dom4j.node;
import org.dom4j.io.saxreader;
import org.junit.test;
/*
 * 使用xpath查找xml文档数据
 * 
 */
public class demoxpath {
  @test
  //输出book.xml中所有price元素节点的文本值
  public void test1() throws exception {
    saxreader reader = new saxreader();
    document document = reader.read("src/main/java/book.xml");
    list<? extends node> selectnodes = document.selectnodes("//price");
    for(node node : selectnodes) {
      string text = node.gettext();
      system.out.println(text);
    }
  }
   
  @test
  //输出book.xml中第二本书的price元素节点的文本值
  public void test2() throws exception {
    saxreader reader = new saxreader();
    document document = reader.read("src/main/java/book.xml");
    node selectsinglenode = document.selectsinglenode("/bookshelf/book[2]/price");
    string text = selectsinglenode.gettext();
    system.out.println(text);
  }
   
  @test
  //输出book.xml中第二本书和第三本书的author元素节点的文本值
  public void test3() throws exception {
    saxreader reader = new saxreader();
    document document = reader.read("src/main/java/book.xml");
    list<? extends node> selectsinglenode = document.selectnodes("/bookshelf/book[position()>1]/author");
    for (node node : selectsinglenode) {
      string text = node.gettext();
      system.out.println(text);
    }
  }
   
  @test
  //输出book.xml中含有属性id的所有name的文本值
  public void test4() throws exception {
    saxreader reader = new saxreader();
    document document = reader.read("src/main/java/book.xml");
    list<? extends node> selectsinglenode = document.selectnodes("//name[@id]");
    for (node node : selectsinglenode) {
      string text = node.gettext();
      system.out.println(text);
    }
  }
   
  @test
  //输出book.xml中含有属性id="1111"的name的文本值
  public void test5() throws exception {
    saxreader reader = new saxreader();
    document document = reader.read("src/main/java/book.xml");
    node selectsinglenode = document.selectsinglenode("//name[@id=\"1111\"]");
    string text = selectsinglenode.gettext();
    system.out.println(text);
  }
   
  @test
  //输出book.xml中含有属性id="1112"的book的author的文本值
  public void test6() throws exception {
    saxreader reader = new saxreader();
    document document = reader.read("src/main/java/book.xml");
    node selectsinglenode = document.selectsinglenode("//book[name[@id=\"1112\"]]/author");
    string text = selectsinglenode.gettext();
    system.out.println(text);
  }
   
  @test
  //输出book.xml中第一本book的id的属性值
  public void test7() throws exception {
    saxreader reader = new saxreader();
    document document = reader.read("src/main/java/book.xml");
    node selectsinglenode = document.selectsinglenode("//book[1]/name");
    string text = selectsinglenode.valueof("attribute::id");//获取id属性
    system.out.println(text);
  }
   
  @test
  //输出book.xml中book的name的id的属性值为1112的对应的sn的属性值
  public void test8() throws exception {
    saxreader reader = new saxreader();
    document document = reader.read("src/main/java/book.xml");
    list<? extends node> selectnodes = document.selectnodes("//book/name");
    for (node node : selectnodes) {
      if(node.valueof("attribute::id").equals("1112")) {
        system.out.println(node.valueof("attribute::sn"));
      }
    }
  }
}

 <dependency>  
   <groupid>junit</groupid>  
   <artifactid>junit</artifactid>  
   <version>4.11</version>  
  </dependency>  
  <dependency>  
   <groupid>log4j</groupid>  
   <artifactid>log4j</artifactid>  
   <version>1.2.17</version>  
  </dependency>  
  <dependency>  
   <groupid>dom4j</groupid>  
   <artifactid>dom4j</artifactid>  
  </dependency>
<dependency>
 <groupid>jaxen</groupid>
 <artifactid>jaxen</artifactid>
 <version>1.1.6</version>
</dependency>

 <?xml version="1.0" encoding="utf-8"?>
 
<bookshelf>
 <book>
  <name id="1111" sn="sdd8">tomorrow</name> 
  <author>hiskell</author> 
  <price>$40</price>
 </book> 
 <book>
  <name id="1112" sn="sdd9">goodbye to you</name> 
  <author>giddle</author> 
  <price>$25</price>
 </book> 
 <book>
  <name id="1113" sn="sdd0">sea and old</name> 
  <author>heminw</author> 
  <price>$28</price>
 </book>
</bookshelf>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。