Java xpth_java xph-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_37643047/article/details/111337535

此博客展示了在Java里运用XPath解析XML的代码示例。通过创建DocumentBuilderFactory、DocumentBuilder等对象，将XML字符串转换为Document对象，再利用XPathFactory和XPath进行解析，最后输出指定节点内容，体现了XPath在XML解析中的应用。

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package com.classas.one;

import org.w3c.dom.Document;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathFactory;
import java.io.ByteArrayInputStream;
import java.util.ArrayList;

public class xml {


    private static ArrayList<Object> bookList = new ArrayList<Object>();
    /**
     * @param args
     */
    public static void main(String[] args) {
        String  xml="<input1>\n" +
                "      <MbfHeader>\n" +
                "          <ServiceCode>OrderManage</ServiceCode>\n" +
                "          <Operation>CreateOrder</Operation>\n" +
                "          <AppCode>b2c</AppCode>\n" +
                "          <UId>414d5120514d5f6c6f63616c202020203baa[]474c20012802</UId>\n" +
                "          <AuthId/>\n" +
                "      </MbfHeader>\n" +
                "      <MbfBody>\n" +
                "      <Mbf>\n" +
                "          <ServiceCode attr=\"a\">1</ServiceCode>\n" +
                "          <Operation>CreateOrder</Operation>\n" +
                "          <AppCode>b2c</AppCode>\n" +
                "          <UId>414d5120514d5f6c6f63616c202020203baa[]474c20012802</UId>\n" +
                "          <AuthId/>\n" +
                "      </Mbf>\n" +
                "      <Mbf>\n" +
                "          <ServiceCode>2</ServiceCode>\n" +
                "          <Operation>CreateOrder</Operation>\n" +
                "          <AppCode>b2c</AppCode>\n" +
                "          <UId>414d5120514d5f6c6f63616c202020203baa[]474c20012802</UId>\n" +
                "          <AuthId/>\n" +
                "      </Mbf>\n" +
                "      </MbfBody>\n" +
                "  </input1>";
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder build=dbf.newDocumentBuilder();
            Document document=build.parse( new ByteArrayInputStream(xml.getBytes()));
            XPathFactory xPathFactory=XPathFactory.newInstance();
            XPath xpath=xPathFactory.newXPath();
            String string=xpath.evaluate("//MbfBody/Mbf[1]",document);
            System.out.println(string);

        }catch (Exception e){

        }

}}