StringrequestEntity httpClient4.5.14版本怎么写?

在Apache HttpClient 4.5.14版本中，处理HTTP请求通常会涉及到`HttpRequestEntity`的创建，特别是当需要发送POST、PUT等带实体的数据请求时。这里是一个基本的例子，展示如何使用`StringRequestEntity`：

import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
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;

public class HttpClientExample {
    private static final CloseableHttpClient httpClient = HttpClients.createDefault();

    public void sendPost(String url, String requestBody) throws Exception {
        // 创建HttpPost请求
        HttpPost httpPost = new HttpPost(url);

        // 将字符串转换为StringRequestEntity
        StringEntity stringEntity = new StringEntity(requestBody, "UTF-8");
        stringEntity.setContentType("application/x-www-form-urlencoded"); // 设置Content-Type

        // 设置请求体
        httpPost.setEntity(stringEntity);

        try (CloseableHttpResponse response = httpClient.execute(httpPost)) {
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode >= 200 && statusCode < 300) {
                System.out.println("Response status: " + statusCode);
                HttpEntity entity = response.getEntity();
                if (entity != null) {
                    String responseBody = EntityUtils.toString(entity, "UTF-8");
                    System.out.println("Response body: " + responseBody);
                }
            } else {
                throw new RuntimeException("Failed to execute request, status code: " + statusCode);
            }
        }
    }

    // 关闭连接池
    public void shutDown() throws IOException {
        httpClient.close();
    }
}

在这个例子中，你需要替换`url`和`requestBody`为你实际的URL和待发送的数据。当你完成操作后别忘了调用`shutDown()`关闭连接。