restTemplate如何获取Exception中的body信息

问题描述：Rest 接口中的异常,如何能在RestTemplate 中显示出来.RestTemplate 中try catch 的 e.getMessage()只能是请求本身代码异常.(400 null 或者 500 null),但是 用postman 调用的时候是可以显示错误信息的.这是怎么回事?

具体图片情况如下：

但是当我们通过test请求时只能获取到如下信息：

com.disney.wdpro.service.shdr.order.adaptor.ticketing.exception.RestException: 400 
	at com.disney.wdpro.service.shdr.order.adaptor.ticketing.handler.HttpClientResponseErrorHandler.handleError(HttpClientResponseErrorHandler.java:45)
	at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63)
	at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:778)
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:736)
	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:670)
	at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:445)
	at com.disney.wdpro.service.shdr.order.adaptor.ticketing.ShdrOrderAdaptorTicketingApplicationTests.testErrors(ShdrOrderAdaptorTicketingApplicationTests.java:200)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

查询了很多资料，发现是因为restTemplate源代码中进行了异常捕获并重新进行了抛出，所以我们要获取其中body只能通过重写它的方法handleError来进行异常的获取，具体代码如下：

public class RestException extends RestClientException implements Serializable {

    private static final long serialVersionUID = 9166280219178545623L;

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

}

public class HttpClientResponseErrorHandler implements ResponseErrorHandler {

    private ResponseErrorHandler errorHandler = new DefaultResponseErrorHandler();

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

    @Override
    public void handleError(ClientHttpResponse response) throws IOException {

        String body = StringUtil.convertStreamToString(response.getBody());

        try {
            errorHandler.handleError(response);

        }catch (RestClientException re) {
            throw new RestException(re.getMessage(), re, body);
        }
    }
}

进行测试的代码修改成捕获我们自己的异常，就可以获取到body中的信息了。

   try{
            ResponseEntity<TicketCreateOrderResponse> response = restTemplate.postForEntity("https://pep-service-internal.latest.shdrapps.disney.com/ticket-order-service/v2/orders/", httpEntity, TicketCreateOrderResponse.class);
            System.out.println("**************" + response.getBody());

            TicketCreateOrderResponse ticketCreateOrderResponse = response.getBody();
            if (Objects.nonNull(ticketCreateOrderResponse) && StringUtils.isNotBlank(ticketCreateOrderResponse.getOrderId())) {
                ticketCreateOrderResponse.setOrderNumber(ticketCreateOrderResponse.getOrderId());
//                System.out.println(ticketCreateOrderResponse.getErrors().getErrorCode());
//                System.out.println(ticketCreateOrderResponse.getErrors().getErrorMessage());
//                System.out.println(ticketCreateOrderResponse.getErrors().getErrorType());
            }
        }catch (RestException e) {
            e.printStackTrace();
            System.out.println(e.getBody());
            TicketCreateOrderResponse errorResponse = GsonUtil.convertJsonToBean(e.getBody(), TicketCreateOrderResponse.class);
            errorResponse.getErrors().stream().forEach(response -> {
                errorResponse.setOrderNumber(response.getOrderId());
                errorResponse.setCode(Integer.valueOf(response.getErrorCode()));
                errorResponse.setStatus(response.getErrorType());
            });

            System.out.println(GsonUtil.getString(errorResponse));
            System.out.println(e.getRestClientException());
        }

com.disney.wdpro.service.shdr.order.adaptor.ticketing.exception.RestException: 400 
    at com.disney.wdpro.service.shdr.order.adaptor.ticketing.handler.HttpClientResponseErrorHandler.handleError(HttpClientResponseErrorHandler.java:45)
    at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63)
    at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:778)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:736)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:670)
    at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:445)
    at com.disney.wdpro.service.shdr.order.adaptor.ticketing.ShdrOrderAdaptorTicketingApplicationTests.testErrors(ShdrOrderAdaptorTicketingApplicationTests.java:200)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
    at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

{"errors":[{"errorCode":"1009","errorType":"ORDER_ID_DUPLICATE","errorMessage":"org.jooq.exception.DataAccessException: SQL [insert into `ORDERS` (`ORDER_ID`, `CLIENT_NAME`, `CLIENT_ID`, `SESSION_ID`, `ORDER_TYPE`, `PRODUCT_TYPE`, `ORDER_STATUS`, `STORE_ID`, `CUSTOMER_ID`, `BOOKING_INTERFACE`, `USER_LANGUAGE`, `CONTACT_GUEST_ID`, `CONTACT_FIRST_NAME`, `CONTACT_LAST_NAME`, `CONTACT_PHONE`, `CONTACT_EMAIL`, `CONTACT_GOVERNMENT_ID`, `AGENCY_IATA_NUMBER`, `PAYMENT_SESSION_ID`, `CASL`, `CREATE_DATE_TIME`, `LAST_MODIFIED_DATE_TIME`, `VERSION`, `INSTALLMENT_PERIOD`, `FROM_CART`, `REG_SUPPORTED`) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)]; Duplicate entry '123456789' for key 'UQ_BOOKING_ORDER_ID'","orderId":"123456789"}]}
{"orderNumber":"123456789","status":"ORDER_ID_DUPLICATE","code":1009,"errors":[{"errorCode":"1009","errorType":"ORDER_ID_DUPLICATE","errorMessage":"org.jooq.exception.DataAccessException: SQL [insert into `ORDERS` (`ORDER_ID`, `CLIENT_NAME`, `CLIENT_ID`, `SESSION_ID`, `ORDER_TYPE`, `PRODUCT_TYPE`, `ORDER_STATUS`, `STORE_ID`, `CUSTOMER_ID`, `BOOKING_INTERFACE`, `USER_LANGUAGE`, `CONTACT_GUEST_ID`, `CONTACT_FIRST_NAME`, `CONTACT_LAST_NAME`, `CONTACT_PHONE`, `CONTACT_EMAIL`, `CONTACT_GOVERNMENT_ID`, `AGENCY_IATA_NUMBER`, `PAYMENT_SESSION_ID`, `CASL`, `CREATE_DATE_TIME`, `LAST_MODIFIED_DATE_TIME`, `VERSION`, `INSTALLMENT_PERIOD`, `FROM_CART`, `REG_SUPPORTED`) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)]; Duplicate entry u0027123456789u0027 for key u0027UQ_BOOKING_ORDER_IDu0027","orderId":"123456789"}]}
org.springframework.web.client.HttpClientErrorException$BadRequest: 400