转:使用HttpClient发送和接收请求数据
工具类
import java.io.IOException; import java.net.URI; import java.util.ArrayList; import java.util.List; import java.util.Map; import org.apache.http.Consts; import org.apache.http.NameValuePair; 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.client.utils.URIBuilder; import org.apache.http.entity.ContentType; 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; public class HttpClientUtil { public static String doGet(String url, Map<String, String> param) { // 创建Httpclient对象 CloseableHttpClient httpclient = HttpClients.createDefault(); String resultString = ""; CloseableHttpResponse response = null; try { // 创建uri URIBuilder builder = new URIBuilder(url); if (param != null) { for (String key : param.keySet()) { builder.addParameter(key, param.get(key)); } } URI uri = builder.build(); // 创建http GET请求 HttpGet httpGet = new HttpGet(uri); // 执行请求 response = httpclient.execute(httpGet); // 判断返回状态是否为200 if (response.getStatusLine().getStatusCode() == 200) { resultString = EntityUtils.toString(response.getEntity(), "UTF-8"); } } catch (Exception e) { e.printStackTrace(); } finally { try { if (response != null) { response.close(); } httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return resultString; } public static String doGet(String url) { return doGet(url, null); } public static String doPost(String url, Map<String, String> param) { // 创建Httpclient对象 CloseableHttpClient httpClient = HttpClients.createDefault(); CloseableHttpResponse response = null; String resultString = ""; try { // 创建Http Post请求 HttpPost httpPost = new HttpPost(url); // 创建参数列表 if (param != null) { List<NameValuePair> paramList = new ArrayList<>(); for (String key : param.keySet()) { paramList.add(new BasicNameValuePair(key, param.get(key))); } // 模拟表单 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList); httpPost.setEntity(entity); } // 执行http请求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(), "utf-8"); } catch (Exception e) { e.printStackTrace(); } finally { try { response.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return resultString; } public static String doPost(String url) { return doPost(url, null); } public static String doPostJson(String url, String json) { // 创建Httpclient对象 CloseableHttpClient httpClient = HttpClients.createDefault(); CloseableHttpResponse response = null; String resultString = ""; try { // 创建Http Post请求 HttpPost httpPost = new HttpPost(url); // 创建请求内容 StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON); httpPost.setEntity(entity); // 执行http请求 response = httpClient.execute(httpPost); resultString = EntityUtils.toString(response.getEntity(), "utf-8"); } catch (Exception e) { e.printStackTrace(); } finally { try { response.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return resultString; } }
1、发送正常格式数据
客户端:
public static void httpClientTest(){ Map<String, String> param = new HashMap<String, String>(); param.put("username", "xiaoming"); String url="http://127.0.0.1:8080/TestDemo/httpClientResp"; String str = HttpClientUtil.doGet(url, param); System.out.println(str); }
服务端:
@RequestMapping(value = "/httpClientResp") @ResponseBody public String httpClientResp(HttpServletRequest request){ String username = request.getParameter("username"); return username; }
2、发送json数据
客户端:
public static void httpClientJsonTest(){ Map<String, String> param = new HashMap<String, String>(); param.put("username", "xiaoming"); String postParam = JSON.toJSONString(param); String url="http://127.0.0.1:8080/TestDemo/httpClientJsonResp"; String str = HttpClientUtil.doPostJson(url,postParam); System.out.println(str); }
服务端:
@RequestMapping(value = "/httpClientJsonResp") @ResponseBody public String httpClientJsonResp(HttpServletRequest request){ StringBuffer str = new StringBuffer(); try { BufferedInputStream in = new BufferedInputStream(request.getInputStream()); int i; char c; while ((i=in.read())!=-1) { c=(char)i; str.append(c); } }catch (Exception ex) { ex.printStackTrace(); } String string = str.toString(); return string; }
原文链接:https://blog.csdn.net/ling1234ling1234/article/details/80678329