Java 解析 XML 报文示例

avatar 2020年12月25日17:39:52 0 201 views

在与其他公司,尤其是国企项目(如公安系统,银保监等系统)对接接口时,对方经常要求入参或者返回参数需要传 XML 格式报文。

请求他们接口需要自己将参数拼接成XML格式,获取他们返回参数时,需要根据接口文档进行解析,然后处理。

本文以一个例子介绍如何解析响应的XML

 

1.引入依赖

maven项目可以在 pom.xml 里添加

<!-- XML 解析 -->
<dependency>
	<groupId>dom4j</groupId>
	<artifactId>dom4j</artifactId>
	<version>1.6.1</version>
</dependency>
<dependency>
	<groupId>jaxen</groupId>
	<artifactId>jaxen</artifactId>
	<version>1.1.6</version>
</dependency>

 

如果非Maven项目需要引入2个jar: dom4j-1.6.1.jar 和 jaxen-1.1.6.jar

 

2. 解析XML demo

package com.example.demo.xml;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

import java.util.*;

public class Demo {

    public static void main(String[] args) throws DocumentException {
        // XML解析demo
        String xmlString = "<?xml version=\"1.0\" encoding=\"GBK\"?>\n" +
                "<Packet type=\"RESPONSE\" version=\"1.0\">\n" +
                "    <Head>\n" +
                "        <errorCode>00000</errorCode>\n" +
                "        <errorMessage>成功</errorMessage>\n" +
                "    </Head>\n" +
                "    <Body>\n" +
                "        <ResInformation>\n" +
                "            <User>\n" +
                "                <id>1</id>\n" +
                "                <name>张三</name>\n" +
                "                <age>18</age>\n" +
                "                <sex>男</sex>\n" +
                "            </User>\n" +
                "            <User>\n" +
                "                <id>2</id>\n" +
                "                <name>李四</name>\n" +
                "                <age>20</age>\n" +
                "                <sex>女</sex>\n" +
                "            </User>\n" +
                "            <User>\n" +
                "                <id>3</id>\n" +
                "                <name>王五</name>\n" +
                "                <age>19</age>\n" +
                "                <sex>女</sex>\n" +
                "            </User>\n" +
                "            <School>\n" +
                "                <id>3</id>\n" +
                "                <province>广东省</province>\n" +
                "                <city>深圳市</city>\n" +
                "                <name>XXXX大学</name>\n" +
                "            </School>\n" +
                "        </ResInformation>\n" +
                "    </Body>\n" +
                "</Packet>\n";

        Document document = DocumentHelper.parseText(xmlString);
        List bodyInfoList = document.selectNodes("//Packet/Body/ResInformation");
        Iterator iterator = bodyInfoList.iterator();
        List<Map<String, Object>> userList = new ArrayList<>();
        Map<String, Object> school = new HashMap<>();
        while (iterator.hasNext()) {
            Element bodyInfoElement = (Element) iterator.next();
            // 解析 user,针对集合
            Iterator userIterator = bodyInfoElement.elementIterator("User");
            while (userIterator.hasNext()) {
                Map<String, Object> userMap = new HashMap<>();
                Element element = (Element) userIterator.next();
                userMap.put("id", getElementText(element, "id"));
                userMap.put("name", getElementText(element, "name"));
                userMap.put("age", getElementText(element, "age"));
                userMap.put("sex", getElementText(element, "sex"));
                userList.add(userMap);
            }

            // 解析 school,针对单个,对方文档已经说明了就是一个
            Iterator schoolIterator = bodyInfoElement.elementIterator("School");
            while (schoolIterator.hasNext()) {
                Map<String, Object> userMap = new HashMap<>();
                Element element = (Element) schoolIterator.next();
                school.put("id", getElementText(element, "id"));
                school.put("province", getElementText(element, "province"));
                school.put("city", getElementText(element, "city"));
                school.put("name", getElementText(element, "name"));
            }

        }
        System.out.println(userList);
        System.out.println(school);
    }

    /**
     * 功能描述:获取xml元素值
     *
     * @param element
     * @param elementIteratorName
     * @return
     */
    public static String getElementText(Element element, String elementIteratorName) {
        Iterator iterator = element.elementIterator(elementIteratorName);
        if (iterator.hasNext()) {
            Element subElement = (Element) iterator.next();
            return subElement.getText();
        }
        return null;
    }
}

 

输出结果为:

[{sex=男, name=张三, id=1, age=18}, {sex=女, name=李四, id=2, age=20}, {sex=女, name=王五, id=3, age=19}]

{province=广东省, city=深圳市, name=XXXX大学, id=3}

 

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