JAVA 常用的xml工具类-优快云博客

本文链接：https://blog.youkuaiyun.com/wuqiwei521/article/details/71482388

本文介绍了一个专门用于解析和处理XML数据的工具类，包括从HTTP请求中解析XML及从字符串中解析XML的方法，并提供了生成请求XML字符串的功能，适用于微信支付等应用场景。

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主要分为

1：解析request流对象InputStream 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。

2.解析String类型的xml流对象InputStream
解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。

3.获取子结点的xml

用于微信支付通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了

package com.htht.tourism.utils;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;

/**
 * xml工具类
 *
 */
public final class XMLUtil {

    private XMLUtil() {
        throw new Error("工具类不能实例化！");
    }

    /**
     * 解析request流对象InputStream 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。
     */
    @SuppressWarnings("all")
    public static Map<String, String> doXMLParse(final HttpServletRequest request) throws JDOMException, IOException {
        Map<String, String> m = new HashMap<String, String>();
        SAXBuilder builder = new SAXBuilder();
        ServletInputStream in = request.getInputStream();
        Document doc = builder.build(in);
        Element root = doc.getRootElement();
        List<Object> list = root.getChildren();
        Iterator<Object> it = list.iterator();
        while (it.hasNext()) {
            Element e = (Element) it.next();
            String k = e.getName();
            String v = "";
            List children = e.getChildren();
            if (children.isEmpty()) {
                v = e.getTextNormalize();
            } else {
                v = XMLUtil.getChildrenText(children);
            }

            m.put(k, v);
        }

        // 关闭流
        in.close();
        return m;
    }

    /**
     * 解析String类型的xml流对象InputStream
     * 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。
     */
    @SuppressWarnings("all")
    public static Map<String, String> doXMLParse(final String strxml) throws JDOMException, IOException {
        if (null == strxml || "".equals(strxml)) {
            return null;
        }

        Map<String, String> m = new HashMap<String, String>();
        InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
        SAXBuilder builder = new SAXBuilder();
        Document doc = builder.build(in);
        Element root = doc.getRootElement();
        List list = root.getChildren();
        Iterator it = list.iterator();
        while (it.hasNext()) {
            Element e = (Element) it.next();
            String k = e.getName();
            String v = "";
            List children = e.getChildren();
            if (children.isEmpty()) {
                v = e.getTextNormalize();
            } else {
                v = XMLUtil.getChildrenText(children);
            }
            m.put(k, v);
        }

        // 关闭流
        in.close();

        return m;
    }

    /**
     * 获取子结点的xml
     */
    @SuppressWarnings("all")
    private static String getChildrenText(final List children) {
        StringBuffer sb = new StringBuffer();
        if (!children.isEmpty()) {
            Iterator it = children.iterator();
            while (it.hasNext()) {
                Element e = (Element) it.next();
                String name = e.getName();
                String value = e.getTextNormalize();
                List list = e.getChildren();
                sb.append("<" + name + ">");
                if (!list.isEmpty()) {
                    sb.append(XMLUtil.getChildrenText(list));
                }
                sb.append(value);
                sb.append("</" + name + ">");
            }
        }

        return sb.toString();
    }

    /**
     * 将请求参数转换为xml格式的string
     * 通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了.
     * 
     */
    @SuppressWarnings("all")
    public static String getRequestXml(final SortedMap<String, String> parameters) {
        StringBuffer sb = new StringBuffer();
        sb.append("<xml>");
        Set es = parameters.entrySet();
        Iterator it = es.iterator();
        while (it.hasNext()) {
            Map.Entry entry = (Map.Entry) it.next();
            String k = (String) entry.getKey();
            String v = (String) entry.getValue();
            if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
                sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
            } else {
                sb.append("<" + k + ">" + v + "</" + k + ">");
            }
        }
        sb.append("</xml>");
        return sb.toString();
    }

    /**
     * main
     */
    public static void main(final String[] arg) {
        SortedMap<String, String> sm = new TreeMap<String, String>();
        sm.put("SUCCESS", "OK");
        String ss = getRequestXml(sm);
        System.out.println(ss);
    }

}

main方法输出为: