Java实现发送post请求，RestTemplate发送post请求，Httpclient发送post请求_java使用resttemplate发送post请求

一、JAVA 使用RestTemplate发送post请求
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestClientException;
import org.springframework.web.client.RestTemplate;
 
 
 
@Service
@Slf4j
public class TestServiceImpl implements TestService {
 
    @Autowired
    private RestTemplate restTemplate;
 
    private final String URL = "http://15.15.82.127:8124/api/test/getData";
 
    private final String USER_NAME = "test";
 
    private final String PASS_WORD = "test123";
    第一种方法
    //RestTemplate发送POST请求之带header，入参为json格式
    @Override
    public String getData(){
        //1、构建body参数
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("UserName",USER_NAME);
        jsonObject.put("Password",PASS_WORD);
 
        //2、添加请求头
        HttpHeaders headers = new HttpHeaders();
        headers.add("Content-Type","application/json");
 
        //3、组装请求头和参数
        HttpEntity<String> formEntity = new HttpEntity<String>(JSON.toJSONString(jsonObject), headers);
 
        //4、发起post请求
        ResponseEntity<String> stringResponseEntity = null;
        try {
            stringResponseEntity = restTemplate.postForEntity(URL, formEntity, String.class);
            log.info("ResponseEntity----"+stringResponseEntity);
        } catch (RestClientException e) {
            e.printStackTrace();
        }
 
        //5、获取http状态码
        int statusCodeValue = stringResponseEntity.getStatusCodeValue();
        log.info("httpCode-----"+statusCodeValue);
 
        //6、获取返回体
        String body = stringResponseEntity.getBody();
        log.info("body-----"+body);
 
        //7、映射实体类
        Wrapper wrapper = JSONObject.parseObject(body, Wrapper.class);
        String data = wrapper.getData();
        log.info("data-----"+data);
 
        return data;
    }
 
 
    第二种方法
    //RestTemplate发送POST请求之formData形式
    @Override
    public String getData2(){
        MultiValueMap<String, Object> reqMap = new LinkedMultiValueMap<>();;
        reqMap.add("name","huhansan");
        reqMap.add("sex","man");
        //.postForEntity(url,请求数据,返回数据类型)
        return restTemplate.postForEntity("http://localhost:8888/postwithpara", reqMap, String.class).getBody();
 
    }
 
}
 
 
        二、Java 使用Httpclient发送post请求
public void post(String url, Map<String, Object> params) {
        //创建httppost对象
        HttpPost post = new HttpPost(url);
        String paramStr = JSON.toJSONString(params);
        StringEntity stringEntity = new StringEntity(paramStr, StandardCharsets.UTF_8);
 
        //请求参数
        post.setEntity(stringEntity);
 
        //请求头
        post.setHeader("Content-Type", "application/json;charset=UTF-8");
        String msg = null;
        InetAddress ipaddr;
        try {
        //设置长/短连接 此处为短连接
        post.setHeader(HttpHeaders.CONNECTION, HTTP.CONN_CLOSE);
 
        //通过hostname获取本机ip地址
        ipaddr = InetAddress.getLocalHost();
        post.addHeader(new BasicHeader("API-RemoteIP", ipaddr.getHostAddress()));
 
        //创建httpclient对象发送post请求
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse resp = httpClient.execute(post);
 
        try {
        //返回信息
        HttpEntity entity = resp.getEntity();
 
        //获取请求状态码
        int statusCode = resp.getStatusLine().getStatusCode();
        if (entity != null) {
        msg = EntityUtils.toString(entity);
 
        //输出日志
        logger.info("url:" + url + "参数：" + params.toString() + "返回信息：" + msg);
        }
        if (statusCode != 200 && statusCode != 302) {
        //输出日志
        logger.info("url:" + url + "失败信息：" + msg);
        }
        } finally {
        resp.close();
        }
        } catch (Exception e) {
        e.printStackTrace();
        throw new RuntimeException(e.getMessage(), e);
        } finally {
        post.reset();
        post.releaseConnection();
        }
        }