httpclient post 传递List<String>
时间: 2023-11-11 18:09:18 浏览: 47
可以使用以下代码进行HttpPost传递List<String>:
```java
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
List<NameValuePair> params = new ArrayList<>();
List<String> list = new ArrayList<>();
list.add("string1");
list.add("string2");
for (String s : list) {
params.add(new BasicNameValuePair("key[]", s));
}
httpPost.setEntity(new UrlEncodedFormEntity(params, "UTF-8"));
CloseableHttpResponse response = httpClient.execute(httpPost);
```
其中,将List<String>转化为List<NameValuePair>,并以"key[]"的形式添加到请求参数中。
相关问题
帮我用java和org.apache.http.client.methods.HttpPost写一个发送表单的工具,要求参数是String httpUrl 和Map<String,Object> formData Map<String, String> httpHeader
好的,这里是一个示例代码,可以发送带有表单数据的 POST 请求:
```java
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class HttpFormSender {
public static String sendPost(String httpUrl, Map<String,Object> formData, Map<String, String> httpHeader) throws IOException {
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(httpUrl);
// 设置请求头
for (String key : httpHeader.keySet()) {
httpPost.setHeader(key, httpHeader.get(key));
}
// 设置表单数据
List<NameValuePair> formParams = new ArrayList<>();
for (String key : formData.keySet()) {
formParams.add(new BasicNameValuePair(key, formData.get(key).toString()));
}
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, "UTF-8");
httpPost.setEntity(entity);
CloseableHttpResponse response = httpClient.execute(httpPost);
String result = EntityUtils.toString(response.getEntity());
response.close();
httpClient.close();
return result;
}
}
```
使用示例:
```java
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
public class Main {
public static void main(String[] args) {
String httpUrl = "http://example.com/api";
Map<String,Object> formData = new HashMap<>();
formData.put("name", "张三");
formData.put("age", 18);
Map<String, String> httpHeader = new HashMap<>();
httpHeader.put("Content-Type", "application/x-www-form-urlencoded");
try {
String response = HttpFormSender.sendPost(httpUrl, formData, httpHeader);
System.out.println(response);
} catch (IOException e) {
e.printStackTrace();
}
}
}
```
这个示例代码使用了 Apache HttpComponents 的 HttpClient 来发送请求。你需要先在项目中引入以下 Maven 依赖:
```xml
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.13</version>
</dependency>
```
HttpClient Post请求
HttpClient是一个开源的HTTP客户端库,用于发送HTTP请求和接收HTTP响应。它提供了丰富的功能,包括GET、POST、PUT、DELETE等请求方法的支持,以及请求头、请求体、响应头、响应体的处理。
对于HttpClient的POST请求,可以按照以下步骤进行操作:
1. 创建HttpClient对象:
HttpClient httpClient = HttpClientBuilder.create().build();
2. 创建HttpPost对象,并设置请求URL:
HttpPost httpPost = new HttpPost("http://example.com/api");
3. 设置请求参数:
通过NameValuePair或者HttpEntity来设置请求参数,例如:
List<NameValuePair> params = new ArrayList<>();
params.add(new BasicNameValuePair("param1", "value1"));
params.add(new BasicNameValuePair("param2", "value2"));
httpPost.setEntity(new UrlEncodedFormEntity(params));
4. 设置请求头:
可以通过httpPost.setHeader()方法设置请求头,例如:
httpPost.setHeader("Content-Type", "application/x-www-form-urlencoded");
5. 执行请求并获取响应:
使用HttpClient对象执行HttpPost请求,并获取HttpResponse对象,例如:
HttpResponse response = httpClient.execute(httpPost);
6. 处理响应结果:
可以通过HttpResponse对象获取响应状态码、响应头和响应体等信息,例如:
int statusCode = response.getStatusLine().getStatusCode();
Header[] headers = response.getAllHeaders();
String responseBody = EntityUtils.toString(response.getEntity());
以上就是使用HttpClient进行POST请求的基本步骤。当然,在实际使用中还可以根据需要设置其他参数,如超时时间、代理等。
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