HttpURLConnection发送get请求body封装

当你需要通过HttpURLConnection在Java中发送GET请求，并且有数据需要包含在URL查询字符串部分（通常用于GET请求的简单参数传递），你可以这样做：

import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public String sendGetWithBody(URL url, String requestBody) throws Exception {
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod("GET");
    // 将请求体作为查询参数添加到URL
    url = new URL(url.toString() + "?" + requestBody);
    
    if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
        throw new RuntimeException("Failed : HTTP error code : " + connection.getResponseCode());
    }

    BufferedReader br = new BufferedReader(new InputStreamReader((connection.getInputStream())));

    StringBuilder response = new StringBuilder();
    String output;
    while ((output = br.readLine()) != null) {
        response.append(output);
    }
    br.close();

    return response.toString();
}

// 使用示例
String requestBodyExample = "key1=value1&key2=value2";
URL requestUrl = new URL("http://example.com/api");
String result = sendGetWithBody(requestUrl, requestBodyExample);

在这个例子中，`requestBody`会被附加到URL的末尾，形成类似`http://example.com/api?key1=value1&key2=value2`的形式。