[Java知识库]RestTemplate微服务调用——捕捉服务端异常

1. restTemplate执行调用前，设置异常处理类

//1.执行调用前，设置异常处理类
restTemplate.setErrorHandler(new CustomResponseErrorHandler());

public class CustomResponseErrorHandler implements ResponseErrorHandler {

    private ResponseErrorHandler errorHandler = new DefaultResponseErrorHandler();

    @Override
    public void handleError(ClientHttpResponse response) throws IOException {
        // 对请求头的处理
        List<String> customHeader = response.getHeaders().get("x-app-err-id");

        String svcErrorMessageID = "";
        if (customHeader != null) {
            svcErrorMessageID = customHeader.get(0);
        }
        //对body 的处理 (inputStream)
        String body = convertStreamToString(response.getBody());
        try {
            errorHandler.handleError(response);
        } catch (RestClientException scx) {
            throw new CustomException(scx.getMessage(), scx, body);
        }
    }

    @Override
    public boolean hasError(ClientHttpResponse response) throws IOException {
        return errorHandler.hasError(response);
    }

    /**
     * inputStream 装换为 string
     */
    private String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}

2. 捕捉异常

//捕捉异常
	try {      
        } catch (CustomException e) {
            JSONObject info = JSONObject.parseObject(e.getBody());
            JSONObject meta = JSONObject.parseObject(info.get("meta").toString());
            String message = meta.get("message").toString();
            e.printStackTrace();
            log.error(message, e);
        }

public class CustomException extends RestClientException {

    private RestClientException restClientException;
    private String body;

    public RestClientException getRestClientException() {
        return restClientException;
    }

    public void setRestClientException(RestClientException restClientException) {
        this.restClientException = restClientException;
    }

    public String getBody() {
        return body;
    }

    public void setBody(String body) {
        this.body = body;
    }


    public CustomException(String msg, RestClientException restClientException, String body) {
        super(msg);
        this.restClientException = restClientException;
        this.body = body;
    }

}

代码网上整合而来的，具体链接忘了…