JavaWeb实现动态网页下载的代码_java实现动态页面下载功能-优快云博客

本文链接：https://blog.youkuaiyun.com/LGJ1025/article/details/8128853

本文介绍了一种使用JavaWeb实现动态文件下载的方法。通过创建一个Servlet（Page.java），设置响应头为下载类型，并将指定内容写入输出流，实现文件内容的下载。同时提供了一个简单的HTML页面用于触发下载。

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JavaWeb实现动态网页下载的代码

建立一个Page.java，Servlet的文件：

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Page extends HttpServlet {

public Page() {
super();
}

public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
*            the request send by the client to the server
* @param response
*            the response send by the server to the client
* @throws ServletException
*             if an error occurred
* @throws IOException
*             if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

this.doPost(request, response);
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
*            the request send by the client to the server
* @param response
*            the response send by the server to the client
* @throws ServletException
*             if an error occurred
* @throws IOException
*             if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {//动态网页下载

  response.setContentType("application/x-msdownload");//设置文件类型
  response.addHeader("Context-Disposition", "attachment,filename=aa.txt");
  PrintWriter out = response.getWriter();

  ServletOutputStream sos = response.getOutputStream();
  sos.write("this is a file".getBytes());
  sos.close();
}

public void init() throws ServletException {
// Put your code here
}

}

再建立一个DownLoad.html文件：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>DownLoad.html</title>

</head>

<body>

  This is my HTML page.
  <br>
  <a href="/myeTest/servlet/Page">aaa</a>
</body>
</html>

然后再根据浏览器来查看，并下载。