Java httpcilent表单参数数组

如果您需要使用 Java HttpClient 发送表单参数数组，可以使用以下步骤：

1. 创建一个 HttpClient 实例：

HttpClient client = HttpClient.newHttpClient();

2. 创建一个 HttpPost 请求：

HttpPost request = new HttpPost(url);

3. 创建一个表单参数数组：

List<NameValuePair> params = new ArrayList<>();
params.add(new BasicNameValuePair("param1", "value1"));
params.add(new BasicNameValuePair("param2", "value2"));
params.add(new BasicNameValuePair("param3", "value3"));

4. 将表单参数数组添加到 HttpPost 请求中：

request.setEntity(new UrlEncodedFormEntity(params, StandardCharsets.UTF_8));

这里使用了 `UrlEncodedFormEntity` 类来将参数编码为 URL 编码形式，并将其设置为请求的实体。

5. 发送请求并获取响应：

HttpResponse response = client.execute(request);

完整示例代码如下：

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class HttpClientExample {

    public static void main(String[] args) throws URISyntaxException, IOException {
        String url = "http://example.com";
        List<NameValuePair> params = new ArrayList<>();
        params.add(new BasicNameValuePair("param1", "value1"));
        params.add(new BasicNameValuePair("param2", "value2"));
        params.add(new BasicNameValuePair("param3", "value3"));

        URI uri = new URIBuilder(url)
                .setParameters(params)
                .build();

        HttpClient client = HttpClientBuilder.create().build();
        HttpPost request = new HttpPost(uri);

        request.setEntity(new UrlEncodedFormEntity(params, StandardCharsets.UTF_8));

        HttpResponse response = client.execute(request);

        String responseBody = EntityUtils.toString(response.getEntity());
        System.out.println(responseBody);
    }
}

注意：这里使用了 Apache HttpComponents 库来发送 HTTP 请求。如果您还没有添加该库，请先下载并添加到您的项目中。