Java进阶之XML转JSON

无论是接口测试还是开发中,有时候会遇到接口返回回来的的数据是XML类型的,此时又不想单独写一套XML转Java Bean,因为毕竟XML作为返回结果相对来说还是没有JSON那么主流,而且以JSON字段设计的Bean对象属性不一定吻合XML,那么就需要将XML转成JSON后,再按解析JSON处理了。前段时间刚好遇到这种需求,就将实现方式分享给大家。

相关依赖

基于maven管理依赖,需要在pom文件中加入下面dependency,解析JSON用阿里的fastjson,解析xml用jdom:


        com.alibaba
        fastjson
        1.2.32
 
 
        org.jdom
        jdom
        2.0.2
 

转换逻辑

这里封装了一个XML2JSON工具类:

import org.apache.commons.lang.StringUtils;
import org.jdom2.Document;
import org.jdom2.JDOMException;
import com.alibaba.fastjson.JSONObject;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.LinkedList;
import java.util.List;

/**
 * Created by alany on 2018/7/10.
 */
public class XmlUtils {
    public static JSONObject xml2Json(String xmlStr) throws JDOMException, IOException {
        if (StringUtils.isEmpty(xmlStr)) {
            return null;
        }
        xmlStr = xmlStr.replaceAll("\\\n", "");
        byte[] xml = xmlStr.getBytes("UTF-8");
        JSONObject json = new JSONObject();
        InputStream is = new ByteArrayInputStream(xml);
        SAXBuilder sb = new SAXBuilder();
        Document doc = sb.build(is);
        Element root = doc.getRootElement();
        json.put(root.getName(), iterateElement(root));

        return json;
    }

    private static JSONObject iterateElement(Element element) {
        List node = element.getChildren();
        JSONObject obj = new JSONObject();
        List list = null;
        for (Element child : node) {
            list = new LinkedList();
            String text = child.getTextTrim();
            if (StringUtils.isBlank(text)) {
                if (child.getChildren().size() == 0) {
                    continue;
                }
                if (obj.containsKey(child.getName())) {
                    list = (List) obj.get(child.getName());
                }
                list.add(iterateElement(child)); //遍历child的子节点
                obj.put(child.getName(), list);
            } else {
                if (obj.containsKey(child.getName())) {
                    Object value = obj.get(child.getName());
                    try {
                        list = (List) value;
                    } catch (ClassCastException e) {
                        list.add(value);
                    }
                }
                if (child.getChildren().size() == 0) { //child无子节点时直接设置text
                    obj.put(child.getName(), text);
                } else {
                    list.add(text);
                    obj.put(child.getName(), list);
                }
            }
        }
        return obj;
    }
}

跑个test看下转换效果:

@Test
public void test() throws JDOMException, IOException {
    String xml = "\n" +
            "\n" +
            "\n" +
            "  \n" +
            "  \n" +
            "  \n" +
            "\n" +
            "  \n" +
            "  \n" +
            "  \n" +
            "\n" +
            "   \n" +
            "       \n" +
            "       \n" +
            "  \n" +
            "   \n" +
            "       \n" +
            "       \n" +
            "  \n" +
            "\n" +
            "\n";
    JSONObject json = xml2Json(xml);
    System.out.println(json.toJSONString());
}

跑完直接生产的JSON:

{
    "sitemapindex":{
        "sitemaps":[
            {
                "sitemap":[
                    {
                        "loc":"[http://qq.com/xml/_46.xml](http://qq.com/xml/_46.xml)",
                        "lastmod":"2018-06-20 01:28:09"
                    },
                    {
                        "loc":"[http://qq.com/xml/_47.xml](http://qq.com/xml/_47.xml)",
                        "lastmod":"2018-06-25 01:28:09"
                    }
                ]
            }
        ],
        "sitemap":[
            {
                "loc":"[http://qq.com/xml/_1.xml](http://qq.com/xml/_1.xml)",
                "lastmod":"2018-06-20 01:28:09"
            },
            {
                "loc":"[http://qq.com/xml/_2.xml](http://qq.com/xml/_2.xml)",
                "lastmod":"2018-06-20 01:28:09"
            }
        ]
    }
}

PS: XML格式要标准(标签要成对出现),不然可能会解析不了,测试了较复杂的HTML页面会转换失败的。

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