如何在java中将字符串转换为xml文件

 <?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="https://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="https://www.w3.org/2001/XMLSchema"><soap:Body><LoginResponse xmlns="https://tempuri.org/QuestIPhoneWebService/QuestIPhoneWebService"><LoginResult>&lt;RETURN_VALUE&gt;&lt;ERROR RESULT= '-1' DESC = 'The password entered into the system is not valid. Please check your password and try again.'/&gt;&lt;/RETURN_VALUE&gt;</LoginResult></LoginResponse></soap:Body></soap:Envelope>
 <?xml version="1.0" encoding="utf-8"?><soap:En