在Spring Boot中，可以通过注入HttpServletResponse对象来获取。具体步骤如下：
-
在EventSourceListener类中定义一个HttpServletResponse类型的成员变量response，并添加一个构造函数，将response作为参数传入。
-
在onEvent方法中，通过response.getWriter()方法获取PrintWriter对象，然后使用该对象向客户端发送数据
以下是示例代码：
@Component
public class MyEventSourceListener implements EventSourceListener {private HttpServletResponse response;public MyEventSourceListener(HttpServletResponse response) {this.response = response;}@Overridepublic void onOpen() throws IOException {// 设置响应头response.setContentType("text/event-stream");response.setCharacterEncoding("UTF-8");response.setHeader("Cache-Control", "no-cache");response.setHeader("Connection", "keep-alive");}@Overridepublic void onEvent(String event, String id, String data) throws IOException {PrintWriter writer = response.getWriter();writer.write("event: " + event + "\n");writer.write("id: " + id + "\n");writer.write("data: " + data + "\n\n");writer.flush();}@Overridepublic void onError(Throwable t) {t.printStackTrace();}@Overridepublic void onComplete() {try {response.getWriter().close();} catch (IOException e) {e.printStackTrace();}}
}
