java httpclient调用接口

1. 需要引入依赖

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.13</version>
</dependency>

2. 使用案例

import org.apache.commons.lang3.exception.ExceptionUtils;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;import java.io.IOException;
import java.net.URI;
import java.nio.charset.Charset;public class UseHttpclientDemo {public static void main(String[] args) {String postResultData = postResult();if (postResultData == null) {System.out.println("{\"errno\":-1,\"errmsg\":\"fail\",\"message\":\"调用接口获取数据失败\"}");return;}System.out.println(postResultData);String getResultData = getResult();if (getResultData == null) {System.out.println("{\"errno\":-1,\"errmsg\":\"fail\",\"message\":\"调用接口获取数据失败\"}");return;}System.out.println(getResultData);}public static String postResult() {//超时时间/*** RequestConfig.DEFAULT == 一直请求* RequestConfig.DEFAULT == RequestConfig.custom()*          .setConnectTimeout(-1).setConnectionRequestTimeout(-1).setSocketTimeout(-1)*          .build();*/RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(3000) //连接主机超时时间.setConnectionRequestTimeout(4000) //请求超时时间.setSocketTimeout(5000) //数据读取超时时间.build();//请求体StringEntity requestBody = new StringEntity("{\"invoke_info\":{\"pos_1\":[{}],\"pos_2\":[{}],\"pos_3\":[{}]}}", ContentType.APPLICATION_JSON);//http客户端CloseableHttpClient httpClient = HttpClients.createDefault();//post请求HttpPost postRequest = new HttpPost();postRequest.setConfig(requestConfig);postRequest.setURI(URI.create("https://ug.baidu.com/mcp/pc/pcsearch")); //请求路径postRequest.addHeader(HTTP.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString()); //请求头postRequest.addHeader("xxx","xxx");postRequest.addHeader("xxx","xxx");postRequest.setEntity(requestBody); //请求体String result = null;try {//发送请求CloseableHttpResponse response = httpClient.execute(postRequest);if (response == null || response.getStatusLine() == null || response.getStatusLine().getStatusCode() !=200) {return null;}/*** response.getHeaders("xxx"); //响应头* response.getEntity().getContent(); //响应体(获取文件数据)* EntityUtils.toString(response.getEntity(), Charset.defaultCharset()); //响应体(获取json数据)*///响应内容String responseBody = EntityUtils.toString(response.getEntity(), Charset.defaultCharset()); //响应体(获取json数据)result = responseBody;} catch (ClientProtocolException e) {//接口调用异常或接口数据传输异常System.out.println("接口调用异常:"+e);System.out.println(ExceptionUtils.getStackTrace(e));} catch (IOException e) {//接口数据传输异常System.out.println("接口调用异常："+e);System.out.println(ExceptionUtils.getStackTrace(e));} finally {if (httpClient != null) {try {httpClient.close();} catch (IOException e) {//关闭httpclient失败System.out.println("关闭httpclient失败：");System.out.println(ExceptionUtils.getStackTrace(e));}}}return result;}public static String getResult() {//超时时间/*** RequestConfig.DEFAULT == 一直请求* RequestConfig.DEFAULT == RequestConfig.custom()*          .setConnectTimeout(-1).setConnectionRequestTimeout(-1).setSocketTimeout(-1)*          .build();*/RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(3000) //连接主机超时时间.setConnectionRequestTimeout(4000) //请求超时时间.setSocketTimeout(5000) //数据读取超时时间.build();//http客户端CloseableHttpClient httpClient = HttpClients.createDefault();//post请求HttpGet getRequest = new HttpGet();getRequest.setConfig(requestConfig);getRequest.setURI(URI.create("https://dict.youdao.com/login/acc/query/accountinfo?withCredentials=true&caKu=3")); //请求路径+入参getRequest.addHeader(HTTP.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString()); //请求头getRequest.addHeader("xxx","xxx");getRequest.addHeader("xxx","xxx");String result = null;try {//发送请求CloseableHttpResponse response = httpClient.execute(getRequest);if (response == null || response.getStatusLine() == null || response.getStatusLine().getStatusCode() !=200) {return null;}/*** response.getHeaders("xxx"); //响应头* response.getEntity().getContent(); //响应体(获取文件数据)* EntityUtils.toString(response.getEntity(), Charset.defaultCharset()); //响应体(获取json数据)*///响应内容String responseBody = EntityUtils.toString(response.getEntity(), Charset.defaultCharset()); //响应体(获取json数据)result = responseBody;} catch (ClientProtocolException e) {//接口调用异常或接口数据传输异常System.out.println("接口调用异常:"+e);System.out.println(ExceptionUtils.getStackTrace(e));} catch (IOException e) {//接口数据传输异常System.out.println("接口调用异常："+e);System.out.println(ExceptionUtils.getStackTrace(e));} finally {if (httpClient != null) {try {httpClient.close();} catch (IOException e) {//关闭httpclient失败System.out.println("关闭httpclient失败：");System.out.println(ExceptionUtils.getStackTrace(e));}}}return result;}
}