filter中重写应答要素
java web中，重写response应答体（响应体）
/*** * Send http request * * @param response * @param bytes :字节数组 * @param contentType :if is null,default value is "application/json" * @param encoding ： 编码方式 * @throws IOException */public static void sendRequestWriter(HttpServletResponse response, byte[] bytes,String contentType,String encoding) throws IOException {response.setContentLength(bytes.length);if (contentType == null) {contentType = "application/json";}response.setContentType(contentType);PrintWriter printer = response.getWriter();printer.println(new String(bytes,encoding));printer.flush();printer.close();}/*** * * @param response * @param sendData :<code>String</code> * @param contentType * @param encoding : such as GBK/utf-8 * @throws IOException */public static void sendRequestWriter(HttpServletResponse response, String sendData,String contentType,String encoding) throws IOException {//response.setContentLength(sendData.getBytes(encoding).length);byte[]bytes=sendData.getBytes(encoding);sendRequestWriter(response, bytes, contentType, encoding);}?以上方法都是使用PrintWriter来写入response的。
下面的方式是使用流的方式写入response：
/*** * test ok * @param response * @param bytes * @param contentType * @param encoding * @throws IOException */public static void sendRequestStream(HttpServletResponse response, byte[] bytes,String contentType) throws IOException {response.setContentLength(bytes.length);if (contentType == null) {contentType = "application/json";}response.setContentType(contentType);ServletOutputStream sos = response.getOutputStream();sos.write(bytes, 0, bytes.length);sos.flush();sos.close();}?应用：用于在网关中进行请求转发和响应。
见附件中的类com.common.util.SystemUtil