HttpClient简单封装及使用

ゝ一世哀愁。 2022-06-10 12:15 256阅读 0赞

1：所需jar包，下载地址[http://hc.apache.org/downloads.cgi][http_hc.apache.org_downloads.cgi]

![Image 1][]

![Center][]

2：封装类

package com.java.test;
    
    import java.io.File;
    import java.io.IOException;
    import java.net.URL;
    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.conn.ssl.DefaultHostnameVerifier;
    import org.apache.http.conn.util.PublicSuffixMatcher;
    import org.apache.http.conn.util.PublicSuffixMatcherLoader;
    import org.apache.http.entity.ContentType;
    import org.apache.http.entity.StringEntity;
    import org.apache.http.entity.mime.MultipartEntityBuilder;
    import org.apache.http.entity.mime.content.FileBody;
    import org.apache.http.entity.mime.content.StringBody;
    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 HttpClientUtil {
    
        private RequestConfig requestConfig = RequestConfig.custom()  
                .setSocketTimeout(15000)  
                .setConnectTimeout(15000)  
                .setConnectionRequestTimeout(15000)  
                .build();  
          
        private static HttpClientUtil instance = null;  
        private HttpClientUtil(){}  
        public static HttpClientUtil getInstance(){  
            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);// 创建httpPost    
            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);// 创建httpPost    
            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httpPost    
            // 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（带文件） 
         * @param httpUrl 地址 
         * @param maps 参数 
         * @param fileLists 附件 
         */  
        public String sendHttpPost(String httpUrl, Map<String, String> maps, List<File> fileLists) {  
            HttpPost httpPost = new HttpPost(httpUrl);// 创建httpPost    
            MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();  
            for (String key : maps.keySet()) {  
                meBuilder.addPart(key, new StringBody(maps.get(key), ContentType.TEXT_PLAIN));  
            }  
            for(File file : fileLists) {  
                FileBody fileBody = new FileBody(file);  
                meBuilder.addPart("files", fileBody);  
            }  
            HttpEntity reqEntity = meBuilder.build();  
            httpPost.setEntity(reqEntity);  
            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);// 创建get请求  
            return sendHttpGet(httpGet);  
        }  
          
        /** 
         * 发送 get请求Https 
         * @param httpUrl 
         */  
        public String sendHttpsGet(String httpUrl) {  
            HttpGet httpGet = new HttpGet(httpUrl);// 创建get请求  
            return sendHttpsGet(httpGet);  
        }  
          
        /** 
         * 发送Get请求 
         * @param httpPost 
         * @return 
         */  
        private 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;  
        }  
          
        /** 
         * 发送Get请求Https 
         * @param httpPost 
         * @return 
         */  
        private String sendHttpsGet(HttpGet httpGet) {  
            CloseableHttpClient httpClient = null;  
            CloseableHttpResponse response = null;  
            HttpEntity entity = null;  
            String responseContent = null;  
            try {  
                // 创建默认的httpClient实例.  
                PublicSuffixMatcher publicSuffixMatcher = PublicSuffixMatcherLoader.load(new URL(httpGet.getURI().toString()));  
                DefaultHostnameVerifier hostnameVerifier = new DefaultHostnameVerifier(publicSuffixMatcher);  
                httpClient = HttpClients.custom().setSSLHostnameVerifier(hostnameVerifier).build();  
                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;  
        }  
        
    }

3：测试类

package com.java.test;
    
    import java.util.HashMap;
    import java.util.Map;
    
    public class Test01 {
        
        /**
         *   url拼接参数
         *  
         */
        public static void test01(){
            String responseContent = HttpClientUtil.getInstance()  
                    .sendHttpPost("http://127.0.0.1:8090/activeAction!queryList.action?sj=13901828800");  
            System.out.println("reponse content:" + responseContent); 
        }
        
        /**
         * 多个参数
         * 
         */
        public static void test02(){
            String responseContent = HttpClientUtil.getInstance()  
                    .sendHttpPost("http://127.0.0.1:8090/activeAction!queryList.action", "sj=13901828800");  
            System.out.println("reponse content:" + responseContent);  
        }
        
        /**
         * map参数
         * 
         */
        public static void test03(){
            Map<String, String> maps = new HashMap<String, String>();  
            maps.put("sj", "13901828800");  
            String responseContent = HttpClientUtil.getInstance()  
                    .sendHttpPost("http://127.0.0.1:8090/activeAction!queryList.action", maps);  
            System.out.println("reponse content:" + responseContent); 
        }
        
        /**
         * get
         * 
         */
        public static void test04(){
            String responseContent = HttpClientUtil.getInstance().sendHttpGet
                    ("http://127.0.0.1:8090/activeAction!queryList.action?sj=13901828800");  
            System.out.println("reponse content:" + responseContent); 
        }
        
        public static void test05(){
            String responseContent = HttpClientUtil.getInstance().sendHttpGet
                    ("https://www.baidu.com");  
            System.out.println("reponse content:" + responseContent); 
        }
        
        public static void main(String[] args) {
            //test01();
            //test02();
            //test03();
            //test04();
            test05();
        }
        
        
        
    }

[http_hc.apache.org_downloads.cgi]: http://hc.apache.org/downloads.cgi
[Image 1]: 
[Center]: /images/20220610/1942c8462d3146d7a5311ee06993e25e.png