jsoup
package cn.itcast.xml.jsoup;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.File;
import java.io.IOException;
/**
- Jsoup快速入门
*/
public class JsoupDemo1 {
public static void main(String[] args) throws IOException { //2.获取Document对象,根据xml文档获取 //2.1获取student.xml的path String path = JsoupDemo1.class.getClassLoader().getResource("student.xml").getPath(); //2.2解析xml文档,加载文档进内存,获取dom树--->Document Document document = Jsoup.parse(new File(path), "utf-8"); //3.获取元素对象 Element Elements elements = document.getElementsByTag("name"); System.out.println(elements.size()); //3.1获取第一个name的Element对象 Element element = elements.get(0); //3.2获取数据 String name = element.text(); System.out.println(name); }
}
package cn.itcast.xml.jsoup;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.File;
import java.io.IOException;
import java.net.URL;
/**
- Jsoup对象功能
*/
public class JsoupDemo2 {
public static void main(String[] args) throws IOException { //2.1获取student.xml的path String path = JsoupDemo2.class.getClassLoader().getResource("student.xml").getPath(); //2.2解析xml文档,加载文档进内存,获取dom树--->Document /* Document document = Jsoup.parse(new File(path), "utf-8"); System.out.println(document);*/ //2.parse(String html):解析xml或html字符串 /* String str = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n" + "\n" + "<students>\n" + "\t<student number=\"heima_0001\">\n" + "\t\t<name>tom</name>\n" + "\t\t<age>18</age>\n" + "\t\t<sex>male</sex>\n" + "\t</student>\n" + "\t<student number=\"heima_0002\">\n" + "\t\t<name>jack</name>\n" + "\t\t<age>18</age>\n" + "\t\t<sex>female</sex>\n" + "\t</student>\n" + "\n" + "</students>"; Document document = Jsoup.parse(str); System.out.println(document);*/ //3.parse(URL url, int timeoutMillis):通过网络路径获取指定的html或xml的文档对象 URL url = new URL("https://baike.baidu.com/item/jsoup/9012509?fr=aladdin");//代表网络中的一个资源路径 Document document = Jsoup.parse(url, 10000); System.out.println(document); }
}
package cn.itcast.xml.jsoup;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.File;
import java.io.IOException;
import java.net.URL;
/**
- Document/Element对象功能
*/
public class JsoupDemo3 {
public static void main(String[] args) throws IOException { //1.获取student.xml的path String path = JsoupDemo3.class.getClassLoader().getResource("student.xml").getPath(); //2.获取Document对象 Document document = Jsoup.parse(new File(path), "utf-8"); //3.获取元素对象了。 //3.1获取所有student对象 Elements elements = document.getElementsByTag("student"); System.out.println(elements); System.out.println("-----------"); //3.2 获取属性名为id的元素对象们 Elements elements1 = document.getElementsByAttribute("id"); System.out.println(elements1); System.out.println("-----------"); //3.2获取 number属性值为heima_0001的元素对象 Elements elements2 = document.getElementsByAttributeValue("number", "heima_0001"); System.out.println(elements2); System.out.println("-----------"); //3.3获取id属性值的元素对象 Element itcast = document.getElementById("itcast"); System.out.println(itcast); }
}
package cn.itcast.xml.jsoup;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.File;
import java.io.IOException;
/**
*Element对象功能
*/
public class JsoupDemo4 {
public static void main(String[] args) throws IOException { //1.获取student.xml的path String path = JsoupDemo4.class.getClassLoader().getResource("student.xml").getPath(); //2.获取Document对象 Document document = Jsoup.parse(new File(path), "utf-8"); /* Element:元素对象 1. 获取子元素对象 * getElementById(String id):根据id属性值获取唯一的element对象 * getElementsByTag(String tagName):根据标签名称获取元素对象集合 * getElementsByAttribute(String key):根据属性名称获取元素对象集合 * getElementsByAttributeValue(String key, String value):根据对应的属性名和属性值获取元素对象集合 2. 获取属性值 * String attr(String key):根据属性名称获取属性值 3. 获取文本内容 * String text():获取所有字标签的纯文本内容 * String html():获取标签体的所有内容(包括子标签的标签和文本内容) */ //通过Document对象获取name标签,获取所有的name标签,可以获取到两个 Elements elements = document.getElementsByTag("name"); System.out.println(elements.size()); System.out.println("----------------"); //通过Element对象获取子标签对象 Element element_student = document.getElementsByTag("student").get(0); Elements ele_name = element_student.getElementsByTag("name"); System.out.println(ele_name.size()); //获取student对象的属性值 String number = element_student.attr("NUMBER"); System.out.println(number); System.out.println("------------"); //获取文本内容 String text = ele_name.text(); String html = ele_name.html(); System.out.println(text); System.out.println(html); }
}
package cn.itcast.xml.jsoup;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.File;
import java.io.IOException;
/**
*选择器查询
*/
public class JsoupDemo5 {
public static void main(String[] args) throws IOException { //1.获取student.xml的path String path = JsoupDemo5.class.getClassLoader().getResource("student.xml").getPath(); //2.获取Document对象 Document document = Jsoup.parse(new File(path), "utf-8"); //3.查询name标签 /* div{ } */ Elements elements = document.select("name"); System.out.println(elements); System.out.println("=----------------"); //4.查询id值为itcast的元素 Elements elements1 = document.select("#itcast"); System.out.println(elements1); System.out.println("----------------"); //5.获取student标签并且number属性值为heima_0001的age子标签 //5.1.获取student标签并且number属性值为heima_0001 Elements elements2 = document.select("student[number=\"heima_0001\"]"); System.out.println(elements2); System.out.println("----------------"); //5.2获取student标签并且number属性值为heima_0001的age子标签 Elements elements3 = document.select("student[number=\"heima_0001\"] > age"); System.out.println(elements3); }
}
package cn.itcast.xml.jsoup;
import cn.wanghaomiao.xpath.exception.XpathSyntaxErrorException;
import cn.wanghaomiao.xpath.model.JXDocument;
import cn.wanghaomiao.xpath.model.JXNode;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;
import java.io.File;
import java.io.IOException;
import java.util.List;
/**
*XPath查询
*/
public class JsoupDemo6 {
public static void main(String[] args) throws IOException, XpathSyntaxErrorException { //1.获取student.xml的path String path = JsoupDemo6.class.getClassLoader().getResource("student.xml").getPath(); //2.获取Document对象 Document document = Jsoup.parse(new File(path), "utf-8"); //3.根据document对象,创建JXDocument对象 JXDocument jxDocument = new JXDocument(document); //4.结合xpath语法查询 //4.1查询所有student标签 List<JXNode> jxNodes = jxDocument.selN("//student"); for (JXNode jxNode : jxNodes) { System.out.println(jxNode); } System.out.println("--------------------"); //4.2查询所有student标签下的name标签 List<JXNode> jxNodes2 = jxDocument.selN("//student/name"); for (JXNode jxNode : jxNodes2) { System.out.println(jxNode); } System.out.println("--------------------"); //4.3查询student标签下带有id属性的name标签 List<JXNode> jxNodes3 = jxDocument.selN("//student/name[@id]"); for (JXNode jxNode : jxNodes3) { System.out.println(jxNode); } System.out.println("--------------------"); //4.4查询student标签下带有id属性的name标签 并且id属性值为itcast List<JXNode> jxNodes4 = jxDocument.selN("//student/name[@id='itcast']"); for (JXNode jxNode : jxNodes4) { System.out.println(jxNode); } }
}