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手机端利用html下载程序的实现

web.xml

<servlet>
    <servlet-name>DownLoadServlet</servlet-name>
        <servlet-class>com.file.DownLoadServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DownLoadServlet</servlet-name>
        <url-pattern>/DownLoadServlet</url-pattern>
    </servlet-mapping>

servlet:


import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;

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

import org.apache.log4j.Logger;

public class DownLoadServlet extends HttpServlet {
    Logger logger = Logger.getLogger(DownLoadServlet.class);
    public DownLoadServlet() {
        super();
    }

    public void destroy() {
        super.destroy();
    }

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

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        logger.info("下载开始");
        String root = getServletContext().getRealPath("/");
        String path = "download/";
        String name = java.net.URLEncoder.encode("物联健身私教 1.0.apk", "UTF-8");
        name = name.replaceAll("\\+", "%20");
        name = new String(name.getBytes("iso8859-1"), "gb2312");
        response.setContentType("application/x-msdownload");
        response.setHeader("Content-disposition", "attachment; filename="
                + name);

        // 处理请求
        // 读取要下载的文件
        File f = new File(root + path + name);
        if (f.exists()) {
            FileInputStream fis = new FileInputStream(f);
            String filename = URLEncoder.encode(f.getName(), "utf-8"); // 解决中文文件名下载后乱码的问题
            byte[] b = new byte[fis.available()];
            fis.read(b);
            response.setCharacterEncoding("utf-8");
            response.setHeader("Content-Disposition", "attachment; filename="
                    + filename + "");
            // 获取响应报文输出流对象
            ServletOutputStream out = response.getOutputStream();
            // 输出
            out.write(b);
            out.flush();
            out.close();
        }

    }
    /**
     * Initialization of the servlet. <br>
     *
     * @throws ServletException
     *             if an error occurs
     */
    public void init() throws ServletException {

    }

}
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