java如何通过client客戶端http实现get/ post请求传递json参数到restful 服务接口

一、首先在client端，导入maven相关依赖（httpclient以及json相关依赖）

<dependencies><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.2</version></dependency><dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version></dependency><dependency><groupId>net.sf.ezmorph</groupId><artifactId>ezmorph</artifactId><version>1.0.6</version></dependency><dependency><groupId>commons-collections</groupId><artifactId>commons-collections</artifactId><version>3.2.1</version></dependency><dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.8.3</version></dependency></dependencies>

二、程序实例

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;import net.sf.json.JSONObject;public class HttpClientUtil {public static String doGet(String url, Map<String, String> param) { // 创建Httpclient对象 CloseableHttpClient httpclient = HttpClients.createDefault(); //设置请求超时时间（各项超时参数具体含义链接）RequestConfig requestConfig = RequestConfig.custom()         .setConnectTimeout(10000).setConnectionRequestTimeout(10000).setSocketTimeout(10000).build();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); //给这个请求设置请求配置httpGet.setConfig(requestConfig);httpGet.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; rv:6.0.2) Gecko/20100101 Firefox/6.0.2");// 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 doPost(String url, Map<String, String> param) { // 创建Httpclient对象 CloseableHttpClient httpClient = HttpClients.createDefault(); //设置请求超时时间RequestConfig requestConfig = RequestConfig.custom()         .setConnectTimeout(10000).setConnectionRequestTimeout(10000).setSocketTimeout(10000).build();CloseableHttpResponse response = null; String resultString = ""; try { // 创建Http Post请求 HttpPost httpPost = new HttpPost(url); httpPost.setConfig(requestConfig);// 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); if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){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 doPostJson(String url, String json) { // 创建Httpclient对象 CloseableHttpClient httpClient = HttpClients.createDefault(); //设置请求超时时间RequestConfig requestConfig = RequestConfig.custom()         .setConnectTimeout(10000).setConnectionRequestTimeout(10000).setSocketTimeout(10000).build();CloseableHttpResponse response = null; String resultString = ""; try { // 创建Http Post请求 HttpPost httpPost = new HttpPost(url); httpPost.setConfig(requestConfig);// 创建请求内容 ，发送json数据需要设置contentTypeStringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON));httpPost.setEntity(entity); // 执行http请求 response = httpClient.execute(httpPost); if(response.getStatusLine().getStatusCode() == HttpStatus.SC_OK){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; }
}

补充：各项超时参数具体含义链接

1、发送普通格式数据：

客户端代码：

public static void httpClientTest(){String url="http://localhost/SSMActM/RestTest/restMethod";Map<String,String> map=new HashMap<String,String> ();map.put("name", "bob");map.put("id", "2");String str = HttpClientUtil.doGet(url, map);System.out.println(str);
}

服务端：

@RequestMapping(value = "/restMethod")
@ResponseBody
public String restMethod(HttpServletRequest request){String username = request.getParameter("name");return username;
}

2、发送json格式数据：

客户端代码：

public static void httpClientJsonTest(){String url="http://localhost/SSMActM/RestTest/restMethod";Map<String,String> map=new HashMap<String,String> ();map.put("name", "bob");map.put("id", "2");//post使用json格式String param=JSONObject.fromObject(map).toString();String str = HttpClientUtil.doPostJson(url,param);System.out.println(str);
}

服务端：

@RequestMapping(value = "/restMethod")
public String restMethod(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;
}

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java如何通过client客戶端http实现get/ post请求传递json参数到restful 服务接口

补充：各项超时参数具体含义链接

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