public @ResponseBody void exportExcel(HttpServletRequest request, HttpServletResponse response, KhxxCxVO vo) throws IOException{        File csvFile = createCSVFile(request,vo);//获取要下载的文件        BufferedInputStream bis = null;        BufferedOutputStream bos = null;        response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode(csvFile.getName(), "UTF-8"));        response.setHeader("Content-Length", String.valueOf(csvFile.length()));        bis = new BufferedInputStream(new FileInputStream(csvFile));        bos = new BufferedOutputStream(response.getOutputStream());        byte[] buff = new byte[2048];        while (true) {          int bytesRead;          if (-1 == (bytesRead = bis.read(buff, 0, buff.length))) break;          bos.write(buff, 0, bytesRead);        }        bis.close();        bos.close();    }

<dependency>    <groupId>ant</groupId>    <artifactId>ant</artifactId>    <version>1.6.5</version>  </dependency>  

    package demo.action;            import java.io.BufferedInputStream;      import java.io.BufferedOutputStream;      import java.io.File;      import java.io.FileInputStream;      import java.io.FileOutputStream;      import java.io.IOException;      import java.io.InputStream;      import java.io.OutputStream;      import java.net.URLEncoder;            import javax.servlet.http.HttpServletResponse;            import org.apache.log4j.Logger;      import org.apache.struts2.ServletActionContext;      import org.apache.tools.zip.ZipEntry;      import org.apache.tools.zip.ZipOutputStream;            import com.opensymphony.xwork2.ActionSupport;            /**      * 批量下载文件：      *   使用ant.jar包中的org.apache.tools.zip.*完成压缩，      * java原生也有java.util.zip.*但是测试了下无法搞定压缩      * 文件内文件名的中文问题        * @author yangcong      *       */      public class BatchDownloadAction extends ActionSupport {                private Logger Log = Logger.getLogger(BatchDownloadAction.class);          private static final String FilePath = "D:\\";                private static final long serialVersionUID = -8694640030455344419L;                public String execute() {              //生成的ZIP文件名为Demo.zip              String tmpFileName = "Demo.zip";              byte[] buffer = new byte[1024];              String strZipPath = FilePath + tmpFileName;              try {                  ZipOutputStream out = new ZipOutputStream(new FileOutputStream(                          strZipPath));                  // 需要同时下载的两个文件result.txt ，source.txt                  File[] file1 = { new File(FilePath+"test1.txt"),                          new File(FilePath+"测试2.docx") };                  for (int i = 0; i < file1.length; i++) {                      FileInputStream fis = new FileInputStream(file1[i]);                      out.putNextEntry(new ZipEntry(file1[i].getName()));                      //设置压缩文件内的字符编码，不然会变成乱码                      out.setEncoding("GBK");                      int len;                      // 读入需要下载的文件的内容，打包到zip文件                      while ((len = fis.read(buffer)) > 0) {                          out.write(buffer, 0, len);                      }                      out.closeEntry();                      fis.close();                  }                  out.close();                  this.downFile(getResponse(), tmpFileName);              } catch (Exception e) {                  Log.error("文件下载出错", e);              }              return null;          }                /**          * 获取Response          * @return          */          private HttpServletResponse getResponse() {              return ServletActionContext.getResponse();          }                /**          * 文件下载          * @param response          * @param str          */          private void downFile(HttpServletResponse response, String str) {              try {                  String path = FilePath + str;                  File file = new File(path);                  if (file.exists()) {                      InputStream ins = new FileInputStream(path);                      BufferedInputStream bins = new BufferedInputStream(ins);// 放到缓冲流里面                      OutputStream outs = response.getOutputStream();// 获取文件输出IO流                      BufferedOutputStream bouts = new BufferedOutputStream(outs);                      response.setContentType("application/x-download");// 设置response内容的类型                      response.setHeader(                              "Content-disposition",                              "attachment;filename="                                      + URLEncoder.encode(str, "UTF-8"));// 设置头部信息                      int bytesRead = 0;                      byte[] buffer = new byte[8192];                      // 开始向网络传输文件流                      while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {                          bouts.write(buffer, 0, bytesRead);                      }                      bouts.flush();// 这里一定要调用flush()方法                      ins.close();                      bins.close();                      outs.close();                      bouts.close();                  } else {                      response.sendRedirect("../error.jsp");                  }              } catch (IOException e) {                  Log.error("文件下载出错", e);              }          }      }