ServletContext文件下载配置学习笔记

最新推荐文章于 2022-10-27 22:26:58 发布

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最新推荐文章于 2022-10-27 22:26:58 发布

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文章标签： java web.xml

原文链接：http://blog.51cto.com/357712148/2104500

本文介绍了一个简单的Web应用中用于文件下载的Servlet配置方法及其实现细节。通过在web.xml中设置初始化参数，Servlet能够从指定路径读取文件并将其发送给客户端。文中提供了完整的Java代码示例。

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配置web.xml

  <servlet>
    <servlet-name>DownServlet01</servlet-name>
    <servlet-class>cn.downservlet.DownServlet01</servlet-class>
    <init-param>
      <param-name>filePath</param-name>
       <param-value>d:\简历.pdf</param-value>
    </init-param>
  </servlet>

java:

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;

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

public class DownServlet01 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        // NO1
        ServletConfig config = this.getServletConfig();
        String filePath = config.getInitParameter("filePath");

        // NO2 头信息
        File file = new File(filePath);
        response.setHeader("content-disposition",
                "attachment;filename=" + file.getName());

        // NO3
        InputStream is = new FileInputStream(file);
        OutputStream os = response.getOutputStream();
        byte[] buf = new byte[1024];
        int len = 0;
        while ((len = is.read(buf)) > 0) {
            os.write(buf, 0, len);
        }
        is.close();
        os.close();

    }

}

http://localhost:8080/day04/DownServlet01

ServletContext文件下载配置学习笔记