http get请求

妖狐艹你老母 2022-08-20 14:09 158阅读 0赞

**http get 请求方式**

**代码**

import java.io.IOException;
    import java.net.URI;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.Map;
    
    import org.apache.commons.lang3.StringUtils;
    import org.apache.http.HttpEntity;
    import org.apache.http.HttpStatus;
    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.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.util.EntityUtils;
     
    /**
     * 
     * GET接口服务的JAVA示例
     * 
     */
    public class HttpGetApiInvoker {
     
        private final static String URL = "http://test/url";
     
        private final static String REQUEST_CHARSET     =   "UTF-8";
        private final static String RESPONSE_CHARSET    =   "UTF-8";
        private final static int    CONNECT_TIMEOUT     =   5000;               //调用连接超时时间
        private final static int    REQUEST_TIMEOUT     =   10000;              //调用获取数据超时时间
     
        public static void main(String[] args) throws Exception{
        	HttpGetApiInvoker httpGetApiInvoker= new HttpGetApiInvoker();
            Map<String, Object> parameterList = httpGetApiInvoker.prepareParameter();
            String result = httpGetApiInvoker.invoke(parameterList);
            System.out.println(result);
        }
     
        /***
         * 准备业务参数
         * @return
         */
        private Map<String, Object> prepareParameter(){
            Map<String, Object> parameterMap = new HashMap<>();
            parameterMap.put("name", "xxx");
            parameterMap.put("password", "xxxxxxxx");
            return parameterMap;
        }
     
        /***
         * 拼接调用的URL
         * @param url
         * @param parametersMap 业务数据，作为参数
         * @return
         */
        private URI buildUri(String url, Map<String, Object> parametersMap) {
            if (null == parametersMap || parametersMap.isEmpty()) {
                return URI.create(url);
            }
            ArrayList list = new ArrayList(parametersMap.size());
            Iterator iterator = parametersMap.entrySet().iterator();
     
            while (iterator.hasNext()) {
                Map.Entry entry = (Map.Entry) iterator.next();
                list.add(entry.getKey().toString().trim() + "=" + entry.getValue().toString().trim());
            }
            return list.isEmpty() ? URI.create(url) : URI.create(url + "?" + StringUtils.join(list, "&"));
        }
     
        /***
         * 没有使用长连接
         * @param parameterMap
         * @return  JSON格式的字符串
         * @throws IOException
         */
        private String invoke(Map<String, Object> parameterMap) throws IOException {
            HttpGet httpGet = null;
            String result = "";
            try {
     
                //拼接URL
                httpGet = new HttpGet(buildUri(URL,parameterMap));
     
                //设置超时时间
                RequestConfig requestConfig = RequestConfig.custom()
                        .setConnectTimeout(CONNECT_TIMEOUT)
                        .setSocketTimeout(REQUEST_TIMEOUT)
                        .build();
                httpGet.setConfig(requestConfig);
     
                httpGet.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=" + REQUEST_CHARSET);
     
                CloseableHttpClient httpClient = HttpClients.createDefault();
     
                CloseableHttpResponse httpResponse = httpClient.execute(httpGet);
                HttpEntity httpEntity = httpResponse.getEntity();
     
                //返回值不是200，进行错误处理
                if(HttpStatus.SC_OK != httpResponse.getStatusLine().getStatusCode()){
     
                    //相关处理
                    if(null != httpGet) {
                        httpGet.abort();
                    }
                    return result;
                }
     
                //获取结果
                result = EntityUtils.toString(httpEntity, RESPONSE_CHARSET);
     
            }catch(Exception e){
                if(null != httpGet){
                    httpGet.abort();
                }
                throw e;
            }
            return result;
        }
    }

**项目依赖**

<dependency>
     <groupId>org.apache.commons</groupId>
     <artifactId>commons-lang3</artifactId>
     <version>3.3.2 </version>
    </dependency>
    
    <dependency>
     <groupId>org.apache.httpcomponents</groupId>
     <artifactId>httpclient</artifactId>
     <version> 4.3.6</version>
    </dependency>
    
    <dependency>
     <groupId>org.apache.httpcomponents</groupId>
     <artifactId>httpcore</artifactId>
     <version>4.4</version>
    </dependency>