如何把信息写进xml文件里面并且调用出来

1.首先自己创建一个xml文件，例如：SendMail.xml

<?xml version="1.0" encoding="UTF-8"?>

<!--

***** UsersAction配置SendMail相关信息 *****

-->

<SendMail>

<HostName>smtp.exmail.qq.com</HostName>

<SendMailAddress>邮箱的账号</SendMailAddress>

<MailPassword>邮箱的密码</MailPassword>

</SendMail>

2.在工具类SendMail.java中把所用到的变量设置为全局变量

public static String hostName;//设置smtp服务器

public static String sendMailAddress;//设置发送地址

public static String mailPassword;//设置密码

3.让程序自动加载相关配置文件，并且获得xml文件的信息，采用dom4j解析xml文件

private static void initConfig(){

try {

// 开始读取配置文件，并将其中的参数值向默认环境表中进行覆盖

File file = new File(SendMail.class.getClassLoader().getResource("SendMail.xml").getPath());

if (file.exists()) { // 如果可以成功加载配置文件

SAXReader sr = new SAXReader();

Document doc = sr.read(file);

Element root = doc.getRootElement(); // 获得根节点

Element HostName = root.element("HostName");

hostName=HostName.getTextTrim();

Element SendMailAddress = root.element("SendMailAddress");

sendMailAddress=SendMailAddress.getTextTrim();

Element MailPassword = root.element("MailPassword");

mailPassword=MailPassword.getTextTrim();

}

} catch (DocumentException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

static {

initConfig();

}

4.在UsersAction.java类里面直接调用全局变量

sendemail.setHostName(SendMail.hostName);

sendemail.setSendMailAddress(SendMail.sendMailAddress);

sendemail.setMailPassword(SendMail.mailPassword);