HttpRequestHandlingMessagingGateway PayloadExpression java配置

Question

我想使用HttpRequestHandlingMessagingGateway::setPayloadExpression将请求值映射到我的模型对象。我找到了this answer，但没有设法用java配置做同样的事情。如果有人可以提供一个例子，它会很棒。

我的代码：

    @Bean
    public HttpRequestHandlingMessagingGateway httpViewGate() {
        HttpRequestHandlingMessagingGateway gateway = new HttpRequestHandlingMessagingGateway(true);
        RequestMapping requestMapping = new RequestMapping();
        requestMapping.setMethods(HttpMethod.GET);
        requestMapping.setPathPatterns("/foo");
        requestMapping.setProduces(MediaType.APPLICATION_JSON_VALUE);
        gateway.setRequestMapping(requestMapping);
        gateway.setRequestChannel(intConfig.viewFlowRequestChannel());
        gateway.setPayloadExpression(???); //what to do here
        gateway.setRequestPayloadType(ViewClientCriteria.class);// this may not be required
        return gateway;
    }

我也很感兴趣，还有另一种更灵活的方式来做同样的事情。

我使用Spring Boot 1.2.4

Answer 1

Expression payloadExpression = new SpelExpressionParser().parseExpression("...");
gateway.setPayloadExpression(payloadExpression);