如何用java发请求 post传参body form-data

在Java中，使用`HttpURLConnection`或基于Java的HTTP客户端库（例如`Apache HttpClient`、`RestAssured` 或 `Spring Framework`）发送POST请求并传递表单数据（Form Data），你需要按照以下步骤操作： 1. **使用`HttpURLConnection`**: ```java import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; public class FormDataExample { public static void main(String[] args) throws Exception { String url = "http://example.com/api/endpoint"; URL obj = new URL(url); HttpURLConnection con = (HttpURLConnection) obj.openConnection(); // 设置POST请求 con.setRequestMethod("POST"); con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); // 添加表单数据到请求体 String formData = "key=value&another_key=another_value"; con.setDoOutput(true); // 开启输出流 try(OutputStream os = con.getOutputStream()) { byte[] formDataBytes = formData.getBytes("UTF-8"); os.write(formDataBytes); } int responseCode = con.getResponseCode(); if (responseCode == HttpURLConnection.HTTP_OK) { System.out.println("Response: " + readResponse(con)); } } private static String readResponse(HttpURLConnection connection) throws IOException { StringBuilder result = new StringBuilder(); BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream())); String inputLine; while ((inputLine = in.readLine()) != null) { result.append(inputLine); } return result.toString(); } } ``` 2. **使用`Apache HttpClient`**: ```java 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; public class HttpClientFormDataExample { public static void main(String[] args) throws Exception { CloseableHttpClient httpClient = HttpClients.createDefault(); HttpPost httpPost = new HttpPost("http://example.com/api/endpoint"); // 添加表单数据 httpPost.setEntity(new StringEntity("key=value&another_key=another_value", "UTF-8")); httpPost.setHeader("Content-type", "application/x-www-form-urlencoded"); CloseableHttpResponse response = httpClient.execute(httpPost); // ...处理响应... } } ```