Java实现XML与Map转换工具类

一时失言乱红尘 2021-07-24 22:32 426阅读 0赞

# 一 点睛 #

我们常常会遇到XML和Map的转换，在此提供一个工具类。

# 二 代码 #

package com.imooc.demo.common.util;
    
    import org.apache.commons.lang3.StringUtils;
    import org.dom4j.DocumentException;
    import org.dom4j.DocumentHelper;
    import org.dom4j.Element;
    
    import java.util.*;
    
    /**
     * @className: XmlUtils
     * @description: xml工具类
     * @date: 2020/8/21
     * @author: cakin
     */
    public class XmlUtils {
        /**
         * 根据Map组装xml消息体，值对象仅支持基本数据类型、String、BigInteger、BigDecimal，以及包含元素为上述支持数据类型的Map
         *
         * @param vo          map
         * @param rootElement 根元素
         * @return xml消息体
         */
        public static String map2xmlBody(Map<String, Object> vo, String rootElement) {
            org.dom4j.Document doc = DocumentHelper.createDocument();
            Element body = DocumentHelper.createElement(rootElement);
            doc.add(body);
            __buildMap2xmlBody(body, vo);
            return doc.asXML();
        }
    
        private static void __buildMap2xmlBody(Element body, Map<String, Object> vo) {
            if (vo != null) {
                Iterator<String> it = vo.keySet().iterator();
                while (it.hasNext()) {
                    String key = (String) it.next();
                    if (StringUtils.isNotEmpty(key)) {
                        Object obj = vo.get(key);
                        Element element = DocumentHelper.createElement(key);
                        if (obj != null) {
                            if (obj instanceof String) {
                                element.setText((String) obj);
                            } else {
                                if (obj instanceof Character || obj instanceof Boolean || obj instanceof Number
                                        || obj instanceof java.math.BigInteger || obj instanceof java.math.BigDecimal) {
                                    org.dom4j.Attribute attr = DocumentHelper.createAttribute(element, "type", obj.getClass().getCanonicalName());
                                    element.add(attr);
                                    element.setText(String.valueOf(obj));
                                } else if (obj instanceof Map) {
                                    org.dom4j.Attribute attr = DocumentHelper.createAttribute(element, "type", Map.class.getCanonicalName());
                                    element.add(attr);
                                    __buildMap2xmlBody(element, (Map<String, Object>) obj);
                                } else {
                                }
                            }
                        }
                        body.add(element);
                    }
                }
            }
        }
    
        /**
         * 根据xml消息体转化为Map
         *
         * @param xml         xml消息
         * @param rootElement 根元素
         * @return Map
         * @throws DocumentException 文档异常
         */
        public static Map<String, Object> xmlBody2map(String xml, String rootElement) throws DocumentException {
            org.dom4j.Document doc = DocumentHelper.parseText(xml);
            Element body = (Element) doc.selectSingleNode("/" + rootElement);
            Map<String, Object> vo = __buildXmlBody2map(body);
            return vo;
        }
    
        private static Map<String, Object> __buildXmlBody2map(Element body) {
            Map<String, Object> vo = new HashMap<>();
            if (body != null) {
                List<Element> elements = body.elements();
                for (Element element : elements) {
                    String key = element.getName();
                    if (StringUtils.isNotEmpty(key)) {
                        String type = element.attributeValue("type", "java.lang.String");
                        String text = element.getText().trim();
                        Object value = null;
                        if (String.class.getCanonicalName().equals(type)) {
                            value = text;
                        } else if (Character.class.getCanonicalName().equals(type)) {
                            value = new Character(text.charAt(0));
                        } else if (Boolean.class.getCanonicalName().equals(type)) {
                            value = new Boolean(text);
                        } else if (Short.class.getCanonicalName().equals(type)) {
                            value = Short.parseShort(text);
                        } else if (Integer.class.getCanonicalName().equals(type)) {
                            value = Integer.parseInt(text);
                        } else if (Long.class.getCanonicalName().equals(type)) {
                            value = Long.parseLong(text);
                        } else if (Float.class.getCanonicalName().equals(type)) {
                            value = Float.parseFloat(text);
                        } else if (Double.class.getCanonicalName().equals(type)) {
                            value = Double.parseDouble(text);
                        } else if (java.math.BigInteger.class.getCanonicalName().equals(type)) {
                            value = new java.math.BigInteger(text);
                        } else if (java.math.BigDecimal.class.getCanonicalName().equals(type)) {
                            value = new java.math.BigDecimal(text);
                        } else if (Map.class.getCanonicalName().equals(type)) {
                            value = __buildXmlBody2map(element);
                        } else {
                        }
                        vo.put(key, value);
                    }
                }
            }
            return vo;
        }
    
        public static void main(String[] args) throws DocumentException {
            Map vo = new HashMap();
            vo.put("name", "1");
            vo.put("age", 2);
    
            Map vo3 = new HashMap();
            vo3.put("name", "31");
            vo3.put("age", 32);
            vo.put("vo3", vo3);
            String xmlBody = map2xmlBody(vo, "root");
            System.out.println(xmlBody);
            System.out.println("-----------------------------------------------------------");
    
            Map vo2 = new HashMap();
            vo2 = xmlBody2map(xmlBody, "root");
    
            System.out.println(vo2.get("name"));
            System.out.println(vo2.get("age"));
        }
    }

# 三 测试 #

<?xml version="1.0" encoding="UTF-8"?>
    <root><name>1</name><vo3 type="java.util.Map"><name>31</name><age type="java.lang.Integer">32</age></vo3><age type="java.lang.Integer">2</age></root>
    -----------------------------------------------------------
    1
    2