海南 网站制作,北京住总第一开发建设有限公司网站首页,如何用dw做网站前端,子域名做微信开放平台网站应用HttpClient 是Apache Jakarta Common 下的子项目#xff0c;可以用来提供高效的、最新的、功能丰富的支持 HTTP 协议的客户端编程工具包#xff0c;并且它支持 HTTP 协议最新的版本和建议。 就是用来发送http请求或者解析http响应的。
导入依赖#xff1a;
dependency… HttpClient 是Apache Jakarta Common 下的子项目可以用来提供高效的、最新的、功能丰富的支持 HTTP 协议的客户端编程工具包并且它支持 HTTP 协议最新的版本和建议。 就是用来发送http请求或者解析http响应的。
导入依赖
dependencygroupIdorg.apache.httpcomponents/groupIdartifactIdhttpclient/artifactIdversion4.5.13/version
/dependency
使用步骤 创建HttpClient实例 创建某种连接方法的实例 调用HttpClient实例的execute方法来执行请求方法 读取response 释放连接无论执行方法是否成功
发送get请求 创建HttpClient实例
CloseableHttpClient httpClient HttpClients.createDefault(); 创建GET请求方法实例
HttpGet httpGet new HttpGet(http地址); 调用HttpClient实例执行GET实例返回response
CloseableHttpResponse response httpClient.execute(httpGet); 解析response
// 获取状态码
int status response.getStatusLine().getStatusCode();
// 获取实例
HttpEntity entity response.getEntity();
// 获取实例数据
String html EntityUtils.toString(entity); 释放连接
response.close();
httpClient.close();
发送post请求
与get请求方式基本相同只需在创建POST请求实例后使用实例对象调用setEntity(new StringEntity(参数));设置参数 创建HttpClient实例
CloseableHttpClient httpClient HttpClients.createDefault(); 创建POST请求方法实例
HttpGet httpPost new HttpPost(http地址); 设置参数
httpPost.setEntity(new StringEntity(参数)); 调用HttpClient实例执行GET实例返回response
CloseableHttpResponse response httpClient.execute(httpPost); 解析response
// 获取状态码
int status response.getStatusLine().getStatusCode();
// 获取实例
HttpEntity entity response.getEntity();
// 获取实例数据
String html EntityUtils.toString(entity); 释放连接
response.close();
httpClient.close();
使用表单提交参数
提交表单一共就这几步 创建http实例 创建Post请求 设置表单参数并让Post携带 执行请求获取响应 解析响应 关闭资源
// 1. 创建HttpClient实例
CloseableHttpClient httpClient HttpClients.createDefault();
// 2. 设置表单参数
ListNameValuePair listValues new ArrayList();
listValues.add(new BasicNameValuePair(name, root));
listValues.add(new BasicNameValuePair(password, 123456));
// 3. 创建HttpPost实例
HttpPost httpPost new HttpPost(http://httpbin.org/post);
// 4. 让Post携带表单参数
httpPost.setEntity(new UrlEncodedFormEntity(listValues, Consts.UTF_8));
// 5. 获取HttpResponse响应
CloseableHttpResponse response httpClient.execute(httpPost);
// 6. 读response
System.out.println(EntityUtils.toString(response.getEntity()));
// 7. 释放资源
response.close();
httpClient.close();
封装好的HttpClient工具类
package com.sky.utils;import com.alibaba.fastjson.JSONObject;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
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.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;import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;/*** Http工具类*/
public class HttpClientUtil {static final int TIMEOUT_MSEC 5 * 1000;/*** 发送GET方式请求* param url* param paramMap* return*/public static String doGet(String url,MapString,String paramMap){// 创建Httpclient对象CloseableHttpClient httpClient HttpClients.createDefault();String result ;CloseableHttpResponse response null;try{URIBuilder builder new URIBuilder(url);if(paramMap ! null){for (String key : paramMap.keySet()) {builder.addParameter(key,paramMap.get(key));}}URI uri builder.build();//创建GET请求HttpGet httpGet new HttpGet(uri);//发送请求response httpClient.execute(httpGet);//判断响应状态if(response.getStatusLine().getStatusCode() 200){result EntityUtils.toString(response.getEntity(),UTF-8);}}catch (Exception e){e.printStackTrace();}finally {try {response.close();httpClient.close();} catch (IOException e) {e.printStackTrace();}}return result;}/*** 发送POST方式请求* param url* param paramMap* return* throws IOException*/public static String doPost(String url, MapString, String paramMap) throws IOException {// 创建Httpclient对象CloseableHttpClient httpClient HttpClients.createDefault();CloseableHttpResponse response null;String resultString ;try {// 创建Http Post请求HttpPost httpPost new HttpPost(url);// 创建参数列表if (paramMap ! null) {ListNameValuePair paramList new ArrayList();for (Map.EntryString, String param : paramMap.entrySet()) {paramList.add(new BasicNameValuePair(param.getKey(), param.getValue()));}// 模拟表单UrlEncodedFormEntity entity new UrlEncodedFormEntity(paramList);httpPost.setEntity(entity);}httpPost.setConfig(builderRequestConfig());// 执行http请求response httpClient.execute(httpPost);resultString EntityUtils.toString(response.getEntity(), UTF-8);} catch (Exception e) {throw e;} finally {try {response.close();} catch (IOException e) {e.printStackTrace();}}return resultString;}/*** 发送POST方式请求* param url* param paramMap* return* throws IOException*/public static String doPost4Json(String url, MapString, String paramMap) throws IOException {// 创建Httpclient对象CloseableHttpClient httpClient HttpClients.createDefault();CloseableHttpResponse response null;String resultString ;try {// 创建Http Post请求HttpPost httpPost new HttpPost(url);if (paramMap ! null) {//构造json格式数据JSONObject jsonObject new JSONObject();for (Map.EntryString, String param : paramMap.entrySet()) {jsonObject.put(param.getKey(),param.getValue());}StringEntity entity new StringEntity(jsonObject.toString(),utf-8);//设置请求编码entity.setContentEncoding(utf-8);//设置数据类型entity.setContentType(application/json);httpPost.setEntity(entity);}httpPost.setConfig(builderRequestConfig());// 执行http请求response httpClient.execute(httpPost);resultString EntityUtils.toString(response.getEntity(), UTF-8);} catch (Exception e) {throw e;} finally {try {response.close();} catch (IOException e) {e.printStackTrace();}}return resultString;}private static RequestConfig builderRequestConfig() {return RequestConfig.custom().setConnectTimeout(TIMEOUT_MSEC).setConnectionRequestTimeout(TIMEOUT_MSEC).setSocketTimeout(TIMEOUT_MSEC).build();}}
