spring resttemplate get请求支持body

最新推荐文章于 2024-05-28 17:58:00 发布

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本文介绍了如何通过扩展HttpComponentsClientHttpRequestFactory，使得GET请求能够携带Body。通过创建一个名为HttpGetRequestWithEntity的类，继承自HttpEntityEnclosingRequestBase，并重写相关方法，实现了GET请求的HttpHeader设置与HttpEntity的使用。在RestTemplate中应用自定义工厂，从而在发送GET请求时能传递JSON数据。

pom中添加依赖

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.9</version>
</dependency>

RestTemplate，默认用的 HttpComponentsClientHttpRequestFactory 工厂，其中HttpComponentsClientHttpRequestFactory 的 createHttpUriRequest 方法，发现 GET 请求是HttpGet，HttpGet 继承 HttpRequestBase，HttpRequestBase 是不支持传递body的。

HttpEntityEnclosingRequestBase是可以传递body的，那就自定义一个工厂继承HttpComponentsClientHttpRequestFactory，重写createHttpUriRequest方法，当发送的请求是GET请求时，创建自定义的继承HttpEntityEnclosingRequestBase的类，这样GET请求就可以传送body。

public class HttpComponentsClientRestfulHttpRequestFactory extends HttpComponentsClientHttpRequestFactory {
    @Override
    protected HttpUriRequest createHttpUriRequest(HttpMethod httpMethod, URI uri) {
        if (httpMethod == HttpMethod.GET) {
            return new HttpGetRequestWithEntity(uri);
        }
        return super.createHttpUriRequest(httpMethod, uri);
    }
}

public class HttpGetRequestWithEntity extends HttpEntityEnclosingRequestBase {
    public HttpGetRequestWithEntity(final URI uri) {
        super.setURI(uri);
    }

    @Override
    public String getMethod() {
        return HttpMethod.GET.name();
    }
}

HttpEntity 的 httpheader 需要设置 headers.setContentType(MediaType.APPLICATION_JSON)

HttpComponentsClientRestfulHttpRequestFactory factory = new HttpComponentsClientRestfulHttpRequestFactory();
factory.setConnectTimeout(30000);
factory.setReadTimeout(60000);
this.restTemplate = new RestTemplate(factory);


HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<String> httpEntity = new HttpEntity<>(JSONObject.toJSONString(dataMap), headers);
ResponseEntity<byte[]> processEntity = restTemplate.exchange(processUri, HttpMethod.GET, httpEntity, byte[].class);