怎样的string格式的字符串转换为xml

java中将string转换成xml文件，使用开源jar包 dom4j：
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package com.webdesk.swing.powertable.util;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class XmlUtil {

public static String xmlChangeString(String fileName){
try {
SAXReader saxReader = new SAXReader();//新建一个解析类
Document tempDocument = saxReader.read(XmlUtil.class.getClassLoader().getResourceAsStream(fileName));//读入一个文件
return tempDocument.asXML();
} catch (DocumentException e) {
e.printStackTrace();
}
return null;
}
//将字符串string类型转换成xml文件
public static void strChangeXML(String str) throws IOException {
SAXReader saxReader = new SAXReader();
Document document;
try {
document = saxReader.read(new ByteArrayInputStream(str.getBytes("UTF-8")));
OutputFormat format = OutputFormat.createPrettyPrint();
/** 将document中的内容写入文件中 */
XMLWriter writer = new XMLWriter(new FileWriter(new File("src/com/webdesk/swing/powertable/digester/cctv.xml")),format);
writer.write(document);
writer.close();
} catch (DocumentException e) {
e.printStackTrace();
}

}
}