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java 例子
下面是一个简单的Java程序，演示了如何使用Java实现OAuth 2.0的基本功能：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Base64;
public class OAuth2Example {
public static void main(String[] args) throws IOException {
// 定义OAuth 2.0 授权服务器的地址、客户端ID和客户端密钥
String authorizationServerUrl = "http://example.com/oauth2/token";
String clientId = "your_client_id";
String clientSecret = "your_client_secret";
// 构建获取访问令牌的请求
URL url = new URL(authorizationServerUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setDoOutput(true);
// 添加请求参数
String requestBody = "grant_type=client_credentials";
connection.getOutputStream().write(requestBody.getBytes());
// 添加客户端认证头部
String authHeader = clientId + ":" + clientSecret;
String encodedAuthHeader = Base64.getEncoder().encodeToString(authHeader.getBytes());
connection.setRequestProperty("Authorization", "Basic " + encodedAuthHeader);
// 发送请求并获取响应
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
// 解析响应，获取访问令牌
String accessToken = response.toString();
System.out.println("Access Token: " + accessToken);
// 使用访问令牌访问受保护资源
String resourceUrl = "http://example.com/resource";
HttpURLConnection resourceConnection = (HttpURLConnection) new URL(resourceUrl).openConnection();
resourceConnection.setRequestProperty("Authorization", "Bearer " + accessToken);
int statusCode = resourceConnection.getResponseCode();
if (statusCode == HttpURLConnection.HTTP_OK) {
BufferedReader resourceReader = new BufferedReader(new InputStreamReader(resourceConnection.getInputStream()));
String resourceResponse = resourceReader.readLine();
System.out.println("Resource Response: " + resourceResponse);
resourceReader.close();
} else {
System.out.println("Failed to access protected resource, status code: " + statusCode);
}
}
}
在这个示例中，我们模拟了客户端使用客户端凭据授权（Client Credentials Grant）来获取访问令牌，并使用该访问令牌访问受保护的资源。
请确保替换示例中的实际授权服务器地址、客户端ID和客户端密钥。
