实例展示：Java如何进行HTTP请求和响应

原创你的名字 2024-10-09 13:12 55阅读 0赞

在Java中，我们可以使用各种库来发送HTTP请求和处理响应。以下是使用两个常用库（ HttpClient 和 OkHttp ）的示例：

1. 使用HttpClient：

```java
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.util.EntityUtils;

public class HttpClientExample {
    public static void main(String[] args) throws Exception {
        // 创建HTTP GET请求
        HttpGet httpGet = new HttpGet("http://example.com");
        
        // 创建并执行响应
        CloseableHttpResponse response =HttpClientBuilder.build().newCloseableHttpClient();
        try {
            response.execute(httpGet);
            
            // 获取响应实体
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                System.out.println("Response Content: " + EntityUtils.toString(entity));
            }
        } finally {
            response.close();
        }
    }
}
```

2. 使用OkHttp：

```java
import okhttp3.*;

public class OkHttpExample {
    public static void main(String[] args) throws Exception {
        OkHttpClient client = new OkHttpClient();

// 创建HTTP GET请求
        Request request = new Request.Builder()
                .url("http://example.com")
                .build();

// 发送请求并获取响应
        Response response = client.newCall(request).execute();
        
        if (response.isSuccessful()) {
            System.out.println("Response Content: " + response.body().string());
        } else {
            System.err.println("Error Code: " + response.code());
        }

// 关闭响应
        response.body().close();
    }
}
```

这两个示例展示了如何使用Java的HttpClient和OkHttp库发送HTTP请求并处理响应。