Java实现HTTP GET 通过 Body 来发送数据

在开发过程中和第三方系统对接时遇到需要使用GET请求传递JSON参数，现整理请求方式如下。

POM

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>

重写HttpGetWithEntity类

public class HttpGetWithEntity extends HttpEntityEnclosingRequestBase {
    public final static String METHOD_NAME = "GET";

    public HttpGetWithEntity() {
        super();
    }

    public HttpGetWithEntity(final URI uri) {
        super();
        setURI(uri);
    }
    
    public HttpGetWithEntity(final String uri) {
        super();
        setURI(URI.create(uri));
    }

    @Override
    public String getMethod() {
    // TODO Auto-generated method stub
        return METHOD_NAME;
    }

}

调用方法

public class test {
    public static JSONObject processGetWithBody(String url, Map<String, Object> args,String charset) {
        String defaultCharset = "UTF-8";
        JSONObject result = new JSONObject();
        HttpGetWithEntity getWithEntity = new HttpGetWithEntity(url);
        JSONObject params = new JSONObject();
        for (Map.Entry<String, Object> entry : args.entrySet()) {
            params.put(entry.getKey(), entry.getValue());
        }
        HttpEntity httpEntity = new StringEntity(params.toJSONString(), ContentType.APPLICATION_JSON);
        getWithEntity.setEntity(httpEntity);
        try (CloseableHttpClient httpClient = HttpClients.createDefault(); CloseableHttpResponse response = httpClient.execute(getWithEntity)) {
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == HttpStatus.SC_OK) {
                HttpEntity responseEntity = response.getEntity();
                result = JSONObject.parseObject(EntityUtils.toString(responseEntity, StringUtils.hasText(charset) ? charset : defaultCharset));
            } else {
                // TODO:请求失败逻辑
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
}

参考：

https://blog.csdn.net/HermitSun/article/details/89889743

https://blog.csdn.net/tianxingyun/article/details/116419354