浏览器文件下载

处理中文编码Utils

DownLoadUtils.java

import sun.misc.BASE64Encoder;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

public class DownLoadUtils {
	/**
	 * 参数1: 浏览器版本
	 * 参数2 : 需要被转换的文件名称
	 * 返回值 转换之后的文件名称
	 * @param agent
	 * @param filename
	 */
	public static String getName(String agent, String filename) throws UnsupportedEncodingException {
		if (agent.contains("Firefox")) {
			// 火狐浏览器
			BASE64Encoder base64Encoder = new BASE64Encoder();
			filename = "=?utf-8?B?" + base64Encoder.encode(filename.getBytes("utf-8")) + "?=";
		} else {
			// 其它浏览器
			filename = URLEncoder.encode(filename, "utf-8");
		}
		return filename;
	}
}

DownloadImgCNServlet

import org.apache.commons.io.IOUtils;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;

@WebServlet(name = "DownloadImgCNServlet" , urlPatterns = "/DownloadImgCNServlet")
public class DownloadImgCNServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String filename= "下载成功文件名.jpg";
        String agent = request.getHeader("user-agent");
        filename = DownLoadUtils.getName(agent , filename);
        System.out.println(filename);

        response.setHeader("content-disposition" , "attachment;filename="+filename);
        ServletOutputStream outputStream = response.getOutputStream();
        InputStream is = getServletContext().getResourceAsStream("img/abc.jpg");

        IOUtils.copy(is , outputStream);

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

import org.apache.commons.io.IOUtils;

  可以到下载页下载，是对流的操作