使用HttpClient调用接口的实例讲解
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2020-08-29
05:37:27
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使用使用HttpClient调用接口的实例讲解调用接口的实例讲解
下面小编就为大家带来一篇使用HttpClient调用接口的实例讲解。小编觉得挺不错的，现在就分享给大家，也给
大家做个参考。一起跟随小编过来看看吧
一，编写返回对象一，编写返回对象
public class HttpResult {
// 响应的状态码
private int code;
// 响应的响应体
private String body;
get/set…
}
二，封装二，封装HttpClient
package cn.xxxxxx.httpclient;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
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.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.utils.URIBuilder;
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 APIService {
private CloseableHttpClient httpClient;
public APIService() {
// 1 创建HttpClinet，相当于打开浏览器
this.httpClient = HttpClients.createDefault();
}
/**
* 带参数的get请求
*
* @param url
* @param map
* @return
* @throws Exception
*/
public HttpResult doGet(String url, Map<String, Object> map) throws Exception {
// 声明URIBuilder
URIBuilder uriBuilder = new URIBuilder(url);
// 判断参数map是否为非空
if (map != null) {
// 遍历参数
for (Map.Entry<String, Object> entry : map.entrySet()) {
// 设置参数
uriBuilder.setParameter(entry.getKey(), entry.getValue().toString());
}
}
// 2 创建httpGet对象，相当于设置url请求地址
HttpGet httpGet = new HttpGet(uriBuilder.build());
// 3 使用HttpClient执行httpGet，相当于按回车，发起请求
CloseableHttpResponse response = this.httpClient.execute(httpGet);
// 4 解析结果，封装返回对象httpResult，相当于显示相应的结果
// 状态码
// response.getStatusLine().getStatusCode();
// 响应体，字符串，如果response.getEntity()为空，下面这个代码会报错,所以解析之前要做非空的判断
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