JAVA 使用httpclient发送常见HTTP POST 和 GET 请求

旧城等待， 2021-09-27 08:46 431阅读 0赞

JAVA项目开发中不可避免要发送http请求，http请求有get post请求，以下是自己整理的一个HTTP发送请求工具类。

## maven pom文件配置 ##

<dependency>
                <groupId>commons-httpclient</groupId>
                <artifactId>commons-httpclient</artifactId>
                <version>3.1</version>
            </dependency>

## HTTP工具类 ##

import org.apache.commons.httpclient.Header;
    import org.apache.commons.httpclient.HttpClient;
    import org.apache.commons.httpclient.HttpStatus;
    import org.apache.commons.httpclient.URI;
    import org.apache.commons.httpclient.methods.GetMethod;
    import org.apache.commons.httpclient.methods.PostMethod;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    
    import java.io.IOException;
    import java.util.Map;
    
    /** * @author yunfeng * @version V1.0 * @date 2018/5/3 16:33 */
    public class HttpPostUtil { 
    
        private final static Logger log = LoggerFactory.getLogger(HttpPostUtil.class);
    
        /** * @param url * @return */
        public static String getData(String url) {
            HttpClient client = new HttpClient();
            GetMethod method = new GetMethod(url);
            log.info("reqUrl: " + url);
            String respStr = "";
            try {
                int statusCode = client.executeMethod(method);
                log.info("Status Code = " + statusCode);
                respStr = method.getResponseBodyAsString();
                method.releaseConnection();
            } catch (IOException e) {
                log.error("发送HTTP GET请求失败！详情：" + e.toString());
                e.printStackTrace();
            }
            return respStr;
        }
    
        /** * @param url * @param jsonStr * @return */
        public static String postJson(String url, String jsonStr) {
            HttpClient client = new HttpClient();
            PostMethod method = new PostMethod(url);
            method.setRequestHeader("Content-Type", "application/json;charset=utf-8");
            String postBody = buildPostData(jsonStr);
            log.info("reqUrl: " + url);
            log.info("postBody:\r\n" + postBody);
            method.setRequestBody(postBody);
            String respStr = "";
            try {
                int statusCode = client.executeMethod(method);
                log.info("Status Code = " + statusCode);
                respStr = method.getResponseBodyAsString();
    // log.info("respStr:" + respStr);
                method.releaseConnection();
            } catch (IOException e) {
                log.error("发送HTTP POST JSON请求失败！详情：" + e.toString());
                e.printStackTrace();
            }
            return respStr;
        }
    
        /** * @param url * @param jsonStr * @return */
        public static String postJsonHeader(String url, Map<String, String> headerMap, String jsonStr) {
            HttpClient client = new HttpClient();
            PostMethod method = new PostMethod(url);
            method.setRequestHeader("Content-Type", "application/json;charset=utf-8");
            for (Map.Entry<String, String> entry : headerMap.entrySet()) {
                String key = entry.getKey();
                String val = entry.getValue();
                method.setRequestHeader(key, val);
            }
            String postBody = buildPostData(jsonStr);
            log.info("HTTP　ReqUrl: " + url);
            log.info("HTTP　ReqContent: Content-Type: application/json;charset=utf-8");
            log.info("HTTP PostBody:\r\n" + postBody);
            method.setRequestBody(postBody);
            String respStr = "";
            try {
                int statusCode = client.executeMethod(method);
                respStr = method.getResponseBodyAsString();
                if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
                    Header header = method.getResponseHeader("Location");
                    String location = "";
                    if (header != null) {
                        location = header.getValue();
                        method.setURI(new URI(location));
                        statusCode = client.executeMethod(method);
                        respStr = method.getResponseBodyAsString();
                    }
    
                }
                log.info("Status Code = " + statusCode);
    // log.info("respStr:" + respStr);
                method.releaseConnection();
            } catch (IOException e) {
                String detail = "发送HTTP POST JSON请求失败！详情：" + e.toString();
                log.error(detail, e);
                return null;
            }
            return respStr;
        }
    
    
        /** * @param url url * @param formStr form参数 * @return 请求返回 */
        public static String postForm(String url, String formStr) {
            log.info("post URL：" + url);
            HttpClient client = new HttpClient();
            PostMethod method = new PostMethod(url);
            method.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            String postBody = buildPostData(formStr);
            log.info("postBody:\n" + postBody);
            method.setRequestBody(postBody);
            int statusCode = 0;
            String respStr = "";
            try {
                statusCode = client.executeMethod(method);
                log.info("http return status code = " + statusCode);
                respStr = method.getResponseBodyAsString();
    // log.info("http return respStr = " + respStr);
            } catch (IOException e) {
                log.error("发送http form请求失败！详情：" + e.toString());
                e.printStackTrace();
            }
            method.releaseConnection();
            return respStr;
        }
    
    
        /** * @param formStr form参数 * @return */
        private static String buildPostData(String formStr) {
            StringBuilder sb = new StringBuilder();
            sb.append(formStr);
            sb.append("\r\n");
            sb.append("\r\n");
            return sb.toString();
        }
    }