通过JDOM实现XML与String的相互转换

package com.util.xml;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.StringReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;

/**
* 通过JDOM解析XML文件 将字符串格式的XML文件转换为XML的document
*
*/

// 将String转换成XML
public class XMLUtils {

public static Document str2XML(String string) throws Exception {

SAXBuilder buider = new SAXBuilder();

Document document = buider.build(new StringReader(string));

return document;

}

//将XML转换成String输出
public static String xml2Str(String file) throws Exception {

SAXBuilder builder = new SAXBuilder();
Document document = builder.build(new FileInputStream(new File(file)));

Format format = Format.getCompactFormat();
format.setEncoding("UTF-8");// 设置xml文件的字符为UTF-8，解决中文问题
XMLOutputter xmlout = new XMLOutputter();

ByteArrayOutputStream bo = new ByteArrayOutputStream();
xmlout.output(document, bo);
return bo.toString().trim();

}

// 将XML以键值对的形式输出,对于有两层以上的XML文件
public static Map<String, String> paraseXML(String file) throws Exception {

Map<String, String> map = new HashMap<String, String>();

SAXBuilder builder = new SAXBuilder();
Document document = builder.build(new File(file));

Element root = document.getRootElement();

List<Element> list = root.getChildren();
for (Iterator<Element> iterator = list.iterator(); iterator.hasNext();) {

Element firstChild = iterator.next();
List<Element> secondElements = firstChild.getChildren();

for (Iterator<Element> iterator2 = secondElements.iterator(); iterator2
.hasNext();) {

Element secondElement = iterator2.next();
map.put(secondElement.getName(), secondElement.getText());
}

}

return map;
}

public static void main(String[] args) throws Exception {

String str = "<students><Student><name>zhangsan</name><age>18</age><name>lisi</name><age>28</age></Student></students>";
Document document = str2XML(str);
Element root = document.getRootElement();
System.out.println(root.getName());
System.out.println(root.getChildText("name"));

XMLOutputter outputter = new XMLOutputter(Format.getPrettyFormat()
.setIndent("     "));
FileOutputStream fos = new FileOutputStream(new File(
"date\\string2xml.xml"));
outputter.output(document, fos);
fos.close();

String xmlContent = xml2Str("date\\string2xml.xml");
System.out.println("XML的内容为： "+ "\n" + xmlContent);

Map<String, String> xmlMap = new HashMap<String, String>();
xmlMap = paraseXML("date\\string2xml.xml");
Set<String> keysSet = xmlMap.keySet();
for(String key: keysSet){

String value = xmlMap.get(key);
System.out.println(key + " = " + value);
}

}

}