Java XML Transform Usage map2Xml(Map map)

Description

map Xml

License

Apache License

Declaration

public static String map2Xml(Map map) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

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

import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;

import org.xml.sax.InputSource;

public class Main {
    public static String map2Xml(Map map) {
        StringBuffer sbf = new StringBuffer();
        map2Xml(sbf, map);/*  w w  w  .ja v a  2 s  . c o  m*/
        return xmlFormat(sbf.toString());
    }

    private static void map2Xml(StringBuffer buffer, Map map) {
        Set set = map.entrySet();
        Iterator iterator = set.iterator();
        StringBuffer childSbf = new StringBuffer();
        while (iterator.hasNext()) {
            Entry e = (Entry) iterator.next();
            String key = (String) e.getKey();
            Object value = e.getValue();
            if (value instanceof List) {
                List list = (List) value;
                for (int j = 0; j < list.size(); j++) {
                    childSbf.append("<").append(key).append(">");
                    Map valueMap = (Map) list.get(j);
                    map2Xml(childSbf, valueMap);
                    childSbf.append("</").append(key).append(">");
                }
            } else if (value instanceof Map) {
                if (key != null) {
                    childSbf.append("<").append(key).append(">");
                }
                Map valueMap = (Map) value;
                map2Xml(childSbf, valueMap);
                if (key != null) {
                    childSbf.append("</").append(key).append(">");
                }
            } else {
                if (key != null) {
                    childSbf.append("<").append(key).append(">");
                }
                if (null != value) {
                    childSbf.append(value);
                } else {
                    childSbf.append("");
                }
                if (key != null) {
                    childSbf.append("</").append(key).append(">");
                }
            }
        }
        buffer.append(childSbf);
    }

    private static String xmlFormat(String xml) {
        StringWriter writer;
        try {
            DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
            DocumentBuilder db;
            db = dbf.newDocumentBuilder();
            Document doc = db.parse(new InputSource(new StringReader(xml)));
            DOMSource source = new DOMSource(doc);
            writer = new StringWriter();
            Result result = new StreamResult(writer);
            Transformer transformer = TransformerFactory.newInstance().newTransformer();
            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
            transformer.setOutputProperty(OutputKeys.CDATA_SECTION_ELEMENTS, "yes");
            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
            transformer.transform(source, result);
            return (writer.getBuffer().toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

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