import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.URLEncoder;import javax.servlet.http.HttpServletResponse;import org.springframework.util.StringUtils;/** * 文件下载 */public class FileLoad {    /**     * 使用response返回文件流     */    public void loadFile(String filePath, HttpServletResponse response) {        // 声明工具类        BufferedInputStream in = null;        BufferedOutputStream out = null;        try {            // 若路径为空            if (StringUtils.isEmpty(filePath)) {                throw new Exception("invalid filepath of null.");            }            // 没找到文件            File file = new File(filePath);            if (!file.exists()) {                throw new Exception("file not exist in path [" + filePath + "]");            }            // 获取文件名            String fileName = file.getName();            // 输出文件流到浏览器            in = new BufferedInputStream(new FileInputStream(filePath));            out = new BufferedOutputStream(response.getOutputStream());            response.setContentType("application/x-download;charset=utf-8");            response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));            byte[] buffer = new byte[8192];            int count = 0;            while ((count = in.read(buffer, 0, 8192)) != -1) {                out.write(buffer, 0, count);            }            out.flush();            file = null;        } catch (Exception e) {            e.printStackTrace();        } finally {            closeStream(in, out);        }    }    /**     * 关闭输入输出流     */    public void closeStream(InputStream in, OutputStream out) {        if (null != in) {            try {                in.close();            } catch (IOException e) {                // e.printStackTrace();            }        }        if (null != out) {            try {                out.close();            } catch (IOException e) {                // e.printStackTrace();            }        }    }}