这个工具类不错，能把get请求也带body吗

GET请求本身是不支持带有请求体（RequestBody）的，因为GET请求的参数是通过URL传递的。但是，有些情况下，我们可能需要在GET请求中传递一些复杂的参数，比如JSON格式的参数，这时候可以把参数拼接到URL中，然后以普通的形式发送GET请求。下面是一个示例代码：

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.net.URLEncoder;

public class HttpUtil {

    /**
     * 发送GET请求
     *
     * @param url 请求地址
     * @return 响应结果
     * @throws IOException
     */
    public static String doGet(String url) throws IOException {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(url);
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                return EntityUtils.toString(entity);
            }
        } finally {
            if (response != null) {
                response.close();
            }
            httpClient.close();
        }
        return null;
    }

    /**
     * 发送带有请求体的GET请求
     *
     * @param url  请求地址
     * @param data 请求参数，JSON格式
     * @return 响应结果
     * @throws IOException
     */
    public static String doGetWithBody(String url, String data) throws IOException {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet(url + "?" + URLEncoder.encode(data, "utf-8"));
        CloseableHttpResponse response = null;
        try {
            response = httpClient.execute(httpGet);
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                return EntityUtils.toString(entity);
            }
        } finally {
            if (response != null) {
                response.close();
            }
            httpClient.close();
        }
        return null;
    }

    /**
     * 发送POST请求
     *
     * @param url  请求地址
     * @param data 请求参数，JSON格式
     * @return 响应结果
     * @throws IOException
     */
    public static String doPost(String url, String data) throws IOException {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);
        CloseableHttpResponse response = null;
        try {
            StringEntity entity = new StringEntity(data, "utf-8");
            httpPost.setEntity(entity);
            httpPost.setHeader("Content-Type", "application/json");
            response = httpClient.execute(httpPost);
            HttpEntity responseEntity = response.getEntity();
            if (responseEntity != null) {
                return EntityUtils.toString(responseEntity);
            }
        } finally {
            if (response != null) {
                response.close();
            }
            httpClient.close();
        }
        return null;
    }
}

我们新增了一个名为doGetWithBody的方法，用于发送带有请求体的GET请求。在这个方法中，我们将请求体拼接到URL中，然后将URL作为参数传递给HttpGet实例。在使用这个方法时，我们只需要将请求体以JSON格式传递给这个方法即可。

需要注意的是，在将请求体拼接到URL中时，需要对请求体进行URL编码，否则可能会导致请求失败或响应结果不正确。