Json XML互相轉換工具類

pom

<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.62</version>
</dependency>

java

import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;

import com.alibaba.fastjson.JSONArray;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.linlinjava.litemall.core.config.BaseTrade;
import org.linlinjava.litemall.core.config.TransResult;
import org.xml.sax.SAXException;

import com.alibaba.fastjson.JSONObject;

/**
 * @author ：XXX
 * @description ：Json XML 轉換
 * @date ： 2019/10/31 9:35
 */
public class JsonXmlUtils  extends BaseTrade {
    private static final String ENCODING = "UTF-8";

    /**
     * JSON對象轉xml字符串
     *
     * @param json JSON對象
     * @return xml字符串
     */
    public static TransResult<String> jsonToPrettyXml(JSONObject json , String character)  {
        TransResult<String> transResult = new TransResult();
        if (json == null || StringUtil.isEmpty(character)){
            transResult.failure("參數異常");
        }
        try {
            Document document = jsonToDocument(json,character);
            /* 格式化xml */
            OutputFormat format = OutputFormat.createPrettyPrint();
            // 設置縮進爲4個空格
            format.setIndent(" ");
            format.setIndentSize(4);
            format.setEncoding(character);
            StringWriter formatXml = new StringWriter();
            XMLWriter writer = new XMLWriter(formatXml, format);
            writer.write(document);
            transResult.success();
            transResult.setObject(formatXml.toString());
        } catch (SAXException e) {
            logger.error(e.getMessage(), e);
            transResult.failure("XML解析異常:"+e.getMessage());
        }catch (IOException e){
            logger.error(e.getMessage(), e);
            transResult.failure("XML格式化異常:"+e.getMessage());
        }

        return transResult;
    }


    /**
     * XML字符串轉JSON對象
     *
     * @param xml xml字符串
     * @return JSON對象
     * @throws DocumentException
     */
    public static TransResult<JSONObject> xmlToJson(String xml)  {
        TransResult<JSONObject> transResult = new TransResult();
        if (StringUtil.isEmpty(xml)){
            transResult.failure("參數異常");
        }
        try {
            JSONObject json = new JSONObject();
            SAXReader reader = new SAXReader();
            Document document  = reader.read(new StringReader(xml));
            Element root = document.getRootElement();
            json.put(root.getName(), elementToJson(root));
            transResult.success();
            transResult.setObject(json);
        } catch (DocumentException e) {
            logger.error(e.getMessage(), e);
            transResult.failure("XML解析異常:"+e.getMessage());
        }
        return transResult;
    }


    /**
     * JSON對象轉Document對象
     *
     * @param json JSON對象
     * @return Document對象
     * @throws SAXException
     */
    private static Document jsonToDocument(JSONObject json,  String character) throws SAXException {
        Document document = DocumentHelper.createDocument();
        document.setXMLEncoding(character);

        // root對象只能有一個
        for (String rootKey : json.keySet()) {
            Object obj =  json.get(rootKey);
            Element root = null;
            if (obj instanceof JSONObject) {
                root = jsonToElement( (JSONObject)obj , rootKey);
                document.add(root);
            }else if (obj instanceof JSONArray) {
                JSONArray jo = (JSONArray)obj;
                for (int i = 0; i< jo.size();i++ ) {
                    root = jsonToElement( (JSONObject)jo.get(i) , rootKey);
                    document.add(root);
                }

            }
            break;
        }
        return document;
    }

    /**
     * JSON對象轉Element對象
     *
     * @param json JSON對象
     * @param nodeName 節點名稱
     * @return Element對象
     */
    private static Element jsonToElement(JSONObject json, String nodeName) {
        Element node = DocumentHelper.createElement(nodeName);
        for (String key : json.keySet()) {
            try {
                Object child = json.get(key);
                if (child instanceof JSONObject) {
                    node.add(jsonToElement(json.getJSONObject(key), key));
                } else if (child instanceof JSONArray) {
                    JSONArray jo = (JSONArray) child;
                    for (int i = 0; i < jo.size(); i++) {
                        Object co =  jo.get(i);
                        if(co instanceof JSONObject){
                            node.add(jsonToElement((JSONObject)co, key));
                        }else{
                            Element element = DocumentHelper.createElement(key);
                            element.setText(co.toString());
                            node.add(element);
                        }
                    }
                } else {
                    Element element = DocumentHelper.createElement(key);
                    element.setText(json.getString(key));
                    node.add(element);
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }

        return node;
    }

    /**
     * Element對象轉JSON對象
     *
     * @param element Element對象
     * @return JSON對象
     */
    private static JSONObject elementToJson(Element element) {
        JSONObject json = new JSONObject();
        for (Object child : element.elements()) {
            Element e = (Element) child;
            if (e.elements().isEmpty()) {
                json.put(e.getName(), e.getText());
            }

            else {
                json.put(e.getName(), elementToJson(e));
            }
        }

        return json;
    }

}