HttpClientUtil 工具类

叁歲伎倆 2023-01-13 06:24 133阅读 0赞

### HttpClientUtil 工具类 ###

*  依赖
 *  工具类
 *  客户端
 *  参考资料

# 依赖 #

<dependency>
                <groupId>org.apache.httpcomponents</groupId>
                <artifactId>httpclient</artifactId>
                <version>4.5.2</version>
            </dependency>

# 工具类 #

package com.jerry.utls;
    
    package com.httpclinet;
    
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Map;
    
    import org.apache.http.HttpEntity;
    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.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;
    
    /** * http工具类 * @author jerryjin */
    public class HttpClientUtil { 
        private RequestConfig requestConfig = RequestConfig.custom()
                .setSocketTimeout(15000)
                .setConnectTimeout(15000)
                .setConnectionRequestTimeout(15000)
                .build();
    
        private volatile static HttpClientUtil instance = null;
        
        private HttpClientUtil(){ }
        
        public static HttpClientUtil getInstance(){ 
            if (instance == null) { 
                synchronized (HttpClientUtil.class) { 
                    if (instance == null) { 
                        instance = new HttpClientUtil();
                    }
                }
            }
            return instance;
        }
        
        /** * 发送 post请求 * @param httpUrl 地址 */
        public String sendHttpPost(String httpUrl) { 
            HttpPost httpPost = new HttpPost(httpUrl);
            return sendHttpPost(httpPost);
        }
    
        /** * 发送 post请求 * @param httpUrl 地址 * @param params 参数(格式:key1=value1&key2=value2) */
        public String sendHttpPost(String httpUrl, String params) { 
            HttpPost httpPost = new HttpPost(httpUrl);
            try { 
                //设置参数
                StringEntity stringEntity = new StringEntity(params, "UTF-8");
                stringEntity.setContentType("application/x-www-form-urlencoded");
                httpPost.setEntity(stringEntity);
            } catch (Exception e) { 
                e.printStackTrace();
            }
            return sendHttpPost(httpPost);
        }
    
        /** * 发送 post请求 * @param httpUrl 地址 * @param maps 参数 */
        public String sendHttpPost(String httpUrl, Map<String, String> maps) { 
            HttpPost httpPost = new HttpPost(httpUrl);
            // 创建参数队列
            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            for (String key : maps.keySet()) { 
                nameValuePairs.add(new BasicNameValuePair(key, maps.get(key)));
            }
            try { 
                httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
            } catch (Exception e) { 
                e.printStackTrace();
            }
            return sendHttpPost(httpPost);
        }
    
    
        /** * 发送Post请求 * @param httpPost * @return */
        private String sendHttpPost(HttpPost httpPost) { 
            CloseableHttpClient httpClient = null;
            CloseableHttpResponse response = null;
            HttpEntity entity = null;
            String responseContent = null;
            try { 
                // 创建默认的httpClient实例.
                httpClient = HttpClients.createDefault();
                httpPost.setConfig(requestConfig);
                // 执行请求
                response = httpClient.execute(httpPost);
                entity = response.getEntity();
                responseContent = EntityUtils.toString(entity, "UTF-8");
            } catch (Exception e) { 
                e.printStackTrace();
            } finally { 
                try { 
                    // 关闭连接,释放资源
                    if (response != null) { 
                        response.close();
                    }
                    if (httpClient != null) { 
                        httpClient.close();
                    }
                } catch (IOException e) { 
                    e.printStackTrace();
                }
            }
            return responseContent;
        }
    
        /** * 发送 get请求 * @param httpUrl */
        public String sendHttpGet(String httpUrl) { 
            HttpGet httpGet = new HttpGet(httpUrl);
            return sendHttpGet(httpGet);
        }
    
        /** * 发送Get请求 * @param httpGet * @return */
        public String sendHttpGet(HttpGet httpGet) { 
            CloseableHttpClient httpClient = null;
            CloseableHttpResponse response = null;
            HttpEntity entity = null;
            String responseContent = null;
            try { 
                // 创建默认的httpClient实例.
                httpClient = HttpClients.createDefault();
                httpGet.setConfig(requestConfig);
                // 执行请求
                response = httpClient.execute(httpGet);
                entity = response.getEntity();
                responseContent = EntityUtils.toString(entity, "UTF-8");
            } catch (Exception e) { 
                e.printStackTrace();
            } finally { 
                try { 
                    // 关闭连接,释放资源
                    if (response != null) { 
                        response.close();
                    }
                    if (httpClient != null) { 
                        httpClient.close();
                    }
                } catch (IOException e) { 
                    e.printStackTrace();
                }
            }
            return responseContent;
        }
    
    
    }

# 客户端 #

import org.apache.http.client.methods.HttpGet;
    
    /** * @author jerryjin * @Classname HttpClinetDemo * @Date 2021-04-11 12:36 */
    public class HttpClinetDemo { 
        public static void main(String[] args) throws CloneNotSupportedException { 
            String url = "https://jerryjin.blog.csdn.net/article/details/115766780";
            HttpGet get = new HttpGet(url);
    
            get.addHeader("User-Agent", " Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36");
            
            String s = HttpClientUtil.getInstance().sendHttpGet(get);
            System.out.println(s);
        }
    }

# 参考资料 #

[Apache HttpClient Tutorial][]

[Apache HttpClient Tutorial]: https://www.tutorialspoint.com/apache_httpclient/index.htm