引入 dom4j 包
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>

代码

public class Dom4jXml {

@Test
public void test(){
Long start = System.currentTimeMillis();
createXml();
System.out.println("运行时间："+ (System.currentTimeMillis() - start));
}

/**
* 生成xml方法
*/
public static void createXml(){
try {
// 1、创建document对象
Document document = DocumentHelper.createDocument();
// 2、创建根节点rss
Element rss = document.addElement("rss");
// 3、向rss节点添加version属性
rss.addAttribute("version", "2.0");
// 4、生成子节点及子节点内容
Element channel = rss.addElement("channel");
Element title = channel.addElement("title");
title.setText("国内最新新闻");
// 5、设置生成xml的格式
OutputFormat format = OutputFormat.createPrettyPrint();
// 设置编码格式
format.setEncoding("UTF-8");


// 6、生成xml文件
File file = new File("rss.xml");
XMLWriter writer = new XMLWriter(new FileOutputStream(file), format);
// 设置是否转义，默认使用转义字符
writer.setEscapeText(false);
writer.write(document);
writer.close();
System.out.println("生成rss.xml成功");
} catch (Exception e) {
e.printStackTrace();
System.out.println("生成rss.xml失败");
}
}


//下载

public HttpServletResponse download(String path, HttpServletResponse response) {
try {
// path是指欲下载的文件的路径。
File file = new File(path);
// 取得文件名。
String filename = file.getName();
// 取得文件的后缀名。
String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();

// 以流的形式下载文件。
InputStream fis = new BufferedInputStream(new FileInputStream(path));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (IOException ex) {
ex.printStackTrace();
}
return response;
}

 

}