1 function fileFormSubmit(){
 2     var ajax_option={
 3          target : '#output',
 4          beforeSubmit : function(){// 提交前的调用的方法
 5
 6                  },
 7          success : function(formData, jqForm, options){// 提交后的回调函数
 8
 9                  },
10           // url : url,
11           type : 'POST',
12          dataType : "json",
13 //          clearForm : true,
14          resetForm : true,
15          timeout : 3000
16     };
17     // 提交form表单
18     $("#fileForm").ajaxSubmit(ajax_option);
19 }    

1 //设置文件ContentType类型，这样设置，会自动判断下载文件类型
2  response.setContentType("multipart/form-data");
3 String filename = "";
4 //防止中文名称乱码，将名称转成ISO8859-1编码
5 response.setHeader("Content-Disposition", "attachment;fileName="+new String(filename.toString().getBytes("utf-8"),"ISO8859-1"));

//要下载的文件的路径
String downfilePath = "";
ServletOutputStream out;  //通过文件路径获得File对象File file = new File(downfilePath);  try {  FileInputStream inputStream = new FileInputStream(file);  //3.通过response获取ServletOutputStream对象(out)  out = response.getOutputStream();  int b = 0;  byte[] buffer = new byte[1024];  while ((b = inputStream.read(buffer)) > -1){  out.write(buffer,0,b);  //4.写到输出流(out)中
            }  inputStream.close();  out.flush();  out.close();  } catch (IOException e) {  e.printStackTrace();  }  

//zip文件生成的路径，例如c:\\zipfile\\ceshi123.zip
String destPath = "";
ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(new File(destPath))); for(String p: paths){File file = new File(p);//压缩文件，将文件放入zos中compressFile(file, zos, "");
}
//关闭流，不然会出问题
zos.close();

private static void compressFile(File file, ZipOutputStream zos, String dir)  throws Exception {  /** * 压缩包内文件名定义 *  * <pre> * 如果有多级目录，那么这里就需要给出包含目录的文件名 * 如果用WinRAR打开压缩包，中文名将显示为乱码 * </pre> */  ZipEntry entry = new ZipEntry(dir + file.getName());  zos.putNextEntry(entry);  BufferedInputStream bis = new BufferedInputStream(new FileInputStream(  file));  int count;  byte data[] = new byte[1024];  while ((count = bis.read(data, 0, 1024)) != -1) {  zos.write(data, 0, count);  }  bis.close();  zos.closeEntry();  }