SpringBoot：举例说明如何使用@ControllerAdvice处理全局异常

使用@RestController开发web接口时，需要处理Controller层未捕获的异常，提高系统的健壮性。

一般常用的方式是采用@ControllerAdvice和@ExceptionHandler，举例如下：

@ControllerAdvice
public class ControllerAdvice {@ExceptionHandler(value = Exception.class)public RespnseEntity<String> errorHandler(Exception ex, HttpServletRequest httpServletRequest) {// 打印原始异常堆栈ex.printStackTrace();// 打印当前函数堆栈new Exception().printStackTrace();System.out.println("reqtUri: " + httpServletRequest.getRequestUri());ResponseEntity.BodyBuilder bodyBuilder = ResponseEntity.status(500).contentType(MediaType.TEXT_PLAIN);RespnseEntity<String> result = bodyBuilder.body(ex.getMessage());return result;}
}

写一个http客户端，模拟发送http请求时连接中断的情况：

public class SocketClient {public static void main(String[] args) {try {Socket sock = new Socket("127.0.0.1", 8080);PrintWriter out = new PrintWriter(new OutputStreamWriter(sock.getOutputStream()));out.write("GET /health HTTP/1.1");out.write("\r\n");out.write("Host: 127.0.0.1:8080");out.write("\r\n");out.write("Accept: */*");out.write("\r\n");out.write("Content-Length: 10");out.write("\r\n");out.write("\r\n");out.flush();Thread.sleep(1000);out.close();} catch (Exception e) {e.printStack();}}
}

写一个controller用于处理请求：

@RestController
@RequestMapping(path = "/")
public class HealthController {@RequestMapping(path = "/health")public String doHealth(@RequestBody String body) {return "ok";}
}

原始异常堆栈：