利用httpclient发送GET/POST请求

HTTP Post请求示例

最新推荐文章于 2025-07-01 11:14:23 发布

xiaoniuxqq

最新推荐文章于 2025-07-01 11:14:23 发布

阅读量1.1k

点赞数 1

CC 4.0 BY-SA版权

分类专栏： java基础

本文链接：https://blog.youkuaiyun.com/u011649691/article/details/79701952

java基础专栏收录该内容

67 篇文章

订阅专栏

暂时只写post

import com.alibaba.fastjson.JSON;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.Validate;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.methods.HttpPost;
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.util.EntityUtils;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

private Header[] headers = {new BasicHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; " +  
            "Windows NT 5.1; SV1; .NET CLR 2.0.50727; CIBA)"),   
            new BasicHeader("Accept-Language", "zh-cn"),   
            new BasicHeader("Accept", " image/gif, image/x-xbitmap, image/jpeg, " +  
                    "image/pjpeg, application/x-silverlight, application/vnd.ms-excel, " +  
                    "application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*"),   
            new BasicHeader("Content-Type", "application/x-www-form-urlencoded"),   
            new BasicHeader("Accept-Encoding", "gzip, deflate")};  

public static String post(String url, Map<String, String> params) throws IOException {
        CloseableHttpClient httpClient = null;
        String res = null;
        try {
            httpClient = HttpClients.createDefault();
            HttpPost post = new HttpPost(url);
            post.setHeaders(headers);
            //如果有参数则设置参数
            //StringEntity是最简单的传输类型，UrlEncodedFormEntity继承StringEntity，一般用于表单上传，在StringEntity中，表单项的格式是key=value&key=value，
            // 因为这里只有一项表单，所以我用StringEntity
            StringEntity stringEntity = new StringEntity("param="+JSON.toJSONString(params), ContentType.create("application/x-www-form-urlencoded", "UTF-8"));
            //这个设置同上面的设置是不一样的，上面的UTF-8是解析StringEntity中的传入string的字符集，将其转换为byte
            stringEntity.setContentEncoding("utf-8");
            post.setEntity(stringEntity);

//
//            List<BasicNameValuePair> paramList = new ArrayList<BasicNameValuePair>();
//            paramList.add(new BasicNameValuePair("param", JSON.toJSONString(params)));
//            post.setEntity(new UrlEncodedFormEntity(paramList, "UTF-8"));


            HttpResponse response = httpClient.execute(post);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != HttpStatus.SC_OK) {
                System.out.println("错误码[" + statusCode + "]");
            }
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                res = EntityUtils.toString(entity, "UTF-8");
            }
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        } finally {
            if (null != httpClient) {
                httpClient.close();
            }
        }
        return res;
    }

上例中的application/x-www-form-urlencoded键值对可以在spring boot接收端使用@RequestParam接收例如：

public String start(@RequestParam Map<String,String> param, HttpServletRequest request){}