JAVA 内部发送 post 请求

本文详细介绍了如何在Java中使用ApacheHttpClient库创建HttpClient实例,设置连接超时,构建HttpRequest,包括设置URI、头信息和POST数据,然后发送POST请求并处理响应。
// 创建HttpClient实例
HttpClient httpClient = HttpClient.newBuilder()
        .connectTimeout(Duration.ofSeconds(10))
        .build();
// 创建HttpRequest对象
HttpRequest request = HttpRequest.newBuilder()
        .uri(URI.create(url) // 目标链接
        .header("Content-Type", "application/json")
        .header("token", "........") // 添加凭证
        .POST(HttpRequest.BodyPublishers.ofString(String.valueOf(msg)))
        .build();
// 发送POST请求并获取响应
try {
    HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
    System.out.println(response.statusCode());
    System.out.println(response.body());
} catch (
        IOException e) {
    throw new RuntimeException(e);
} catch (InterruptedException e) {
    throw new RuntimeException(e);
}
使用Java的HttpClient发送POST请求可以通过以下步骤完成: 1.创建HttpClient实例: ```java CloseableHttpClient httpClient = HttpClients.createDefault(); ``` 2.创建HttpPost实例: ```java HttpPost httpPost = new HttpPost(url); ``` 其中,url是POST请求的目标URL。 3.设置POST请求参数: ```java List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("param1", "value1")); params.add(new BasicNameValuePair("param2", "value2")); UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8"); httpPost.setEntity(formEntity); ``` 其中,NameValuePair表示请求参数的键值对,UrlEncodedFormEntity表示请求参数的编码方式。 4.执行POST请求: ```java CloseableHttpResponse response = httpClient.execute(httpPost); ``` 5.处理响应结果: ```java HttpEntity entity = response.getEntity(); if (entity != null) { String result = EntityUtils.toString(entity, "UTF-8"); System.out.println(result); } ``` 完整代码示例: ```java import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.utils.URIBuilder; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; public class HttpClientDemo { public static void main(String[] args) throws Exception { CloseableHttpClient httpClient = HttpClients.createDefault(); try { HttpPost httpPost = new HttpPost("http://www.example.com"); List<NameValuePair> params = new ArrayList<NameValuePair>(); params.add(new BasicNameValuePair("param1", "value1")); params.add(new BasicNameValuePair("param2", "value2")); UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "UTF-8"); httpPost.setEntity(formEntity); CloseableHttpResponse response = httpClient.execute(httpPost); try { HttpEntity entity = response.getEntity(); if (entity != null) { String result = EntityUtils.toString(entity, "UTF-8"); System.out.println(result); } } finally { response.close(); } } finally { httpClient.close(); } } } ``` 注意:以上代码中使用了Java 8的Lambda表达式。如果您使用的是Java 7或更早版本,需要将Lambda表达式替换为匿名内部类。
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