java发送form-data形式请求不带文件参数,并获取响应值

在Java中，如果你想要发送一个不包含文件的Form-DATA形式的HTTP POST请求，并获取响应值，你可以使用`HttpURLConnection`或者第三方库如`Apache HttpClient`、`OkHttp`等。这里以`HttpURLConnection`为例：

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

public class FormDataRequestExample {
    public static void main(String[] args) throws Exception {
        String urlStr = "http://example.com/api/endpoint"; // 替换为你实际的URL

        URL url = new URL(urlStr);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

        try(OutputStream os = connection.getOutputStream()) {
            String data = "key1=value1&key2=value2"; // 参数以"?"分隔键值对
            byte[] dataBytes = data.getBytes("UTF-8");
            os.write(dataBytes);
        }

        int responseCode = connection.getResponseCode();
        if (responseCode == HttpURLConnection.HTTP_OK) {
            System.out.println("Response Code: " + responseCode);
            String responseData = readResponse(connection.getInputStream());
            System.out.println("Response Data: " + responseData);
        } else {
            System.out.println("Error: " + responseCode);
        }
    }

    private static String readResponse(InputStream in) throws IOException {
        StringBuilder response = new StringBuilder();
        byte[] buffer = new byte[1024];
        int length;
        while ((length = in.read(buffer)) != -1) {
            response.append(new String(buffer, 0, length));
        }
        return response.toString();
    }
}

在这个例子中，我们首先创建了一个URL对象，然后通过`openConnection()`方法建立连接。设置请求方法为POST，指定内容类型为`application/x-www-form-urlencoded`。接着写入表单数据到输出流中，最后读取服务器响应并打印。