今天一个下载csv功能测试的时候内存爆掉了代码如下:
File file = new File(tempCsvDir+File.separator+filename+".csv");
InputStream fis = new BufferedInputStream(new FileInputStream(file));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + new String((new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())+"xxx.csv").getBytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
toClient.write(buffer);
toClient.flush();
toClient.close();
后面在网上找到答案:修改后好了
循环读取
OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); byte[] buffer = new byte[1024 * 1024 * 8]; int i = -1; while ((i = fis.read(buffer)) != -1) { toClient.write(buffer, 0, i); } fis.close(); toClient.flush(); toClient.close();