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package com.lc.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;

public class DownLoadUtil {
    
    /**
     * 文件下载
     * @param filePath 提供下载的文件（路径+文件名）
     * @param showName 弹框显示的文件名
     * @throws Exception
     */
    public static void load(String filePath, String showName) throws Exception{
        HttpServletResponse response = ServletActionContext.getResponse();    
        InputStream stream = new FileInputStream(filePath);
        response.setContentType("APPLICATION/DOWNLOAD");
        response.setHeader("Content-Disposition", "attachment; filename=" + java.net.URLEncoder.encode(showName, "UTF-8"));
        response.setContentLength(stream.available());
        OutputStream os = response.getOutputStream();
        int iBytesRead = 0;
        byte[] buffer = new byte[10240000];
        while ((iBytesRead = stream.read(buffer, 0, 10240000)) != -1) {
            os.write(buffer, 0, iBytesRead);
        }
        os.close();
        stream.close();
        response.flushBuffer();
        File f = new File(filePath);
        if (f.exists()) {
            f.delete();
        }
    }
}

类似这样的弹出框: