HttpClient应用案例post&get方法

本文主要是列举出了HttpClient的简单使用方法，一个是post方法，另一个是get方法。

这里所使用的是HttpClient4.5.jar

以及使用了JSON-lib-2.1.jar

有兴趣的朋友可以在里搜一下，可以找到

首先post方法，这边我希望传递一个实体类给服务端，所以引用了JSON得方式去传递

先将实体类转换成JSON，再将JSON转换成String字符串型，通过HTTP发送：

package com.HTTPtransfer.test.httpClient; import java.io.IOException; import java.nio.charset.Charset; import net.sf.json.JSONObject; 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.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.util.EntityUtils; public class HttpClientTool { /** * post请求传输String参数 * Content-type:application/json * * @param url * url地址 * @param fileReport * 文件报表对象 * @param responseStr * 不需要返回结果 * @return */ public static String httpPost(String url, FileReport fileReport) { // POST请求返回结果 CloseableHttpClient httpClient = HttpClients.createDefault(); JSONObject json = JSONObject.fromObject(fileReport); HttpPost httpPost = new HttpPost(url); String responseStr = null; // 设置请求和传输超时时间 RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(2000).setConnectTimeout(2000).build(); httpPost.setConfig(requestConfig); try { if (null != json.toString()) { StringEntity entity = new StringEntity(json.toString(), Charset.forName("UTF-8")); entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); httpPost.setEntity(entity); } CloseableHttpResponse result = httpClient.execute(httpPost); if (result.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { try { // 读取服务器返回过来的json字符串数据 responseStr = EntityUtils.toString(result.getEntity(), "utf-8"); System.out.println(responseStr); } catch (Exception e) { e.printStackTrace(); } } } catch (IOException e) { e.printStackTrace(); } finally { httpPost.releaseConnection(); } return responseStr; }

接下来是GET方法，与POST方法不同的是GET方法是将传递的参数放到访问的URL后； 下面这段代码的红色部分就是所要传递的参数：

/** * 发送get请求 * * @param url * 路径 * @return */ public static String httpGet(String url, FileReport fileReport) { // GET请求返回结果 CloseableHttpClient client = HttpClients.createDefault(); url = url + "/?fileCode=" + fileReport.getFileCode(); url = url + "&bizDate=" + fileReport.getBizDate(); HttpGet httpGet = new HttpGet(url); String responseStr = null; // 设置请求和传输超时时间 RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(2000).setConnectTimeout(2000).build(); httpGet.setConfig(requestConfig); try { CloseableHttpResponse response = client.execute(httpGet); if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { HttpEntity entity = response.getEntity(); responseStr = EntityUtils.toString(entity, "utf-8"); System.out.println(responseStr); } else { } } catch (IOException e) { e.printStackTrace(); } finally { httpGet.releaseConnection(); } return responseStr; } } 在介绍完如何通过HttpClient来参数之后，还有一篇关于在Spring框架中接收HttpClient的POST和GET请求的方法