HttpClient发送json、普通参数类型的Post请求

前言：
　　当传递json参数时，需要使用StringEntity将Content-Type设置为text/plain类型
　　当传递非json参数，正常的表单数据时，使用UrlEncodedFormEntity将Content-Type设置为application/x-www-form-urlencoded类型

1、Post请求传json数据

　　 // 省略前面声明请求、设置Header等操作，直接从传递参数开始
 　　JSONObject json = new JSONObject();
 　　json.put("filePath","js");
 　　json.put("projectId","61020ccdfd33d86b6abe8745");
 　　json.put("type","fileFolder");
 　　　　　
 　　// 将参数放到Post中
 　　// 通过new StringEntity()，可将Content-Type设置为text/plain类型
 　　httpPost.setEntity(new StringEntity(json.toString(),"UTF-8"));

2、Post请求传普通参数 

 　　JSONObject json = new JSONObject();
 　　json.put("filePath","js");
 　　json.put("projectId","61020ccdfd33d86b6abe8745");
 　　json.put("type","fileFolder");
   　// 设置参数
 　　List<NameValuePair> parameters = new ArrayList<NameValuePair>();
 　　for(String key:json.keySet()) {
 　　　　parameters.add(new BasicNameValuePair(key, json.getString(key)));
 　　}
 
 　　// 将Content-Type设置为application/x-www-form-urlencoded类型
 　　UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");
 　　httpPost.setEntity(formEntity); 

3、maven依赖

<dependency>
　　<groupId>commons-httpclient</groupId>
　　<artifactId>commons-httpclient</artifactId>
　　<version>3.1</version>
</dependency>
<dependency>
　　<groupId>com.alibaba</groupId>
　　<artifactId>fastjson</artifactId>
　　<version>1.2.76</version>
</dependency>

 

完整代码：

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
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.HttpPost;
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 java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author: yc
 * @Description:
 * @Date: 2021/07/27/18:32
 */
public class HttpClientUtil {

    public static String url = "http://192.168.9.27:3080/co/cmd/deleteProject";

    public static String deletePost() throws IOException {
        String string = "";

        // 获取HttpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        // 声明post请求
        HttpPost httpPost = new HttpPost(url);

        // 设置请求头，在post请求中限制了浏览器才能访问
        httpPost.addHeader("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36");
        httpPost.addHeader("Accept", "*/*");
        httpPost.addHeader("Accept-Encoding", "gzip, deflate, br");
        httpPost.addHeader("Content-Type", "application/json");
//        httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded");
        httpPost.addHeader("Accept-Language", "zh-CN,zh;q=0.9,en;q=0.8");
        httpPost.addHeader("Connection", "keep-alive");
        // 设置token
        httpPost.addHeader("Authorization","eyJ0eXAiOiJKV1QiLCJhbGciOiJIDASDUzI1NiJ9.eyJleHAiOjE2Mjc0NTQzODYsInVzZXJuYW1lIjoiYWJjZCJ9.MYvNg03txeNm_KiI27fdS0KViVxWhLntDjBjiP44UYQDASCSACCSA");

　　　　　JSONObject json = new JSONObject();
　　　　　json.put("filePath","js");
　　　　　json.put("projectId","61020ccdfd33d86b6abe8745");
　　　　　json.put("type","fileFolder");

　　　　　// Post请求发送json类型数据，将Content-Type设置为text/plain类型
        httpPost.setEntity(new StringEntity(json.toString(),"UTF-8"));

　　　　　// 设置参数（Post请求发送非json数据类型）
        //List<NameValuePair> parameters = new ArrayList<NameValuePair>();
        //for(String key:json.keySet()) {
        //    parameters.add(new BasicNameValuePair(key, json.getString(key)));
        //}
　　　　　// 将Content-Type设置为application/x-www-form-urlencoded类型
        //UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters, "UTF-8");
        //httpPost.setEntity(formEntity);

        // 发送请求
        CloseableHttpResponse response = httpClient.execute(httpPost);
        if (response.getStatusLine().getStatusCode() == 200) {
            HttpEntity entity = response.getEntity();
            string = EntityUtils.toString(entity, "utf-8");
        }
        else
        {
            string = "操作失败";
            return string;
        }

        // 关闭资源
        response.close();
        httpClient.close();
        return string;
    }
}