1、前端代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div id="msg_from_server"></div>
<div id="sse"></div>
<script>
// var sse = new EventSource("http://127.0.0.1:8080/sse")
var sse = new EventSource("http://127.0.0.1:8080/sse-retry")
sse.onmessage = function (evt) {
var el = document.getElementById("sse");
el.innerHTML = evt.data;
}
</script>
</body>
</html>
2、后端代码
@Controller
public class SSEController {
@RequestMapping(value = "/sse")
@ResponseBody
public String getStreamDataImprove(HttpServletResponse httpServletResponse) {
httpServletResponse.setContentType("text/event-stream");
httpServletResponse.setCharacterEncoding("utf-8");
String s = "";
while (true) {
s = "data:" + LocalDateTime.now() + "\n\n";
try {
PrintWriter printWriter = httpServletResponse.getWriter();
Thread.sleep(1000L);
printWriter.write(s);
printWriter.flush();
} catch (IOException | InterruptedException e) {
e.printStackTrace();
}
}
}
@RequestMapping(value = "/sse-retry")
@ResponseBody
public void getStreamDataImprove1(HttpServletResponse httpServletResponse) throws IOException {
httpServletResponse.setContentType("text/event-stream");
httpServletResponse.setCharacterEncoding("utf-8");
String s ="retry:2000\n";
s+="data:"+LocalDateTime.now()+"\n\n";
PrintWriter printWriter = httpServletResponse.getWriter();
printWriter.write(s);
printWriter.flush();
}
}
