Java下载zip文件代码

使用struts2框架来下载

在struts.xml配置FiltsdownloadAction.action

FiltsdownloadAction类：

public class FiltsdownloadAction implements Action {

	public String execute() throws Exception {
		HttpServletResponse response = ServletActionContext.getResponse();
		File file = new File("test.zip");
		response.setCharacterEncoding("UTF-8");
		fname = java.net.URLEncoder.encode(fname, "UTF-8");
		response.setHeader("Content-Disposition", "attachment; filename="
				+ fname);
		response.setContentLength((int) file.length());
		response.setContentType("application/zip");// 定义输出类型
		try {
			FileInputStream fis = new FileInputStream(file);
			BufferedInputStream buff = new BufferedInputStream(fis);
			byte[] b = new byte[1024];// 相当于我们的缓存
			long k = 0;// 该值用于计算当前实际下载了多少字节
			OutputStream myout = response.getOutputStream();// 从response对象中得到输出流,准备下载
			// 开始循环下载
			while (k < file.length()) {
				int j = buff.read(b, 0, 1024);
				k += j;
				myout.write(b, 0, j);
			}
			myout.flush();
		} catch (Exception e) {
			System.out.println(e);
		}
		return null;
	}

}