使用servlet实现文件保存

package com;

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

import javax.servlet.ServletConfig;
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 TemplateDownload extends HttpServlet {
    private String strContentType = "application/x-msdownload; charset=utf-8";

    private String strEncode = "utf-8"; // 文件编码

    private String strContent = ""; // 文件内容

    private String strFileName = ""; // 文件名称

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

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.reset();

        String filename = URLEncoder.encode(strFileName, strEncode);
        response.setContentType(strContentType);
        response.addHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
        int fileLength = strContent.length();

        /*如果文件长度大于0*/
        if (fileLength != 0) {
            /*创建输出流*/
            ServletOutputStream servletOS = response.getOutputStream();
            servletOS.write(strContent.getBytes("utf-8"));
            servletOS.flush();
            servletOS.close();
        }
    }

    public void init(ServletConfig servletConfig) throws ServletException {
        super.init(servletConfig);
    }
}