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1. response.getOutputStream()
输出字节流, 客户端会下载字节流并生成文件保存本地
response.setHeader("Content-disposition", "attachment;filename= ***.**"); //客户端得到的文件名
response.setContentType("application/x-download");//设置为下载application/x-download
response.setContentType("text/html; charset=UTF-8");
response.setHeader("Cache-Control","no-cache");
response.setHeader("Cache-Control","no-store");
response.setDateHeader("Expires", 0);
response.setHeader("Pragma","no-cache");
OutputStream fos = response.getOutputStream();
fos.write("hello".getBytes());
2. response.getWriter();
直接在页面上输出字符串
PrintWriter pw = response.getWriter();
pw.println("hello");
pw.flush();
pw.close();