Java 发送 post请求

Posted 2022-01-21 二十六画生的博客

import java.io.IOException;

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
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 org.json.JSONObject;

public class SendPost 

    public static String doPost(String str) 
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultBackUp = " ";
        String result = "";
        try 
            // 创建Http Post请求
            HttpPost httpPost = new HttpPost("http://......");
            // 创建请求内容
            JSONObject param = new JSONObject();
            param.put("str", str);
            StringEntity stringEntity = new StringEntity(param.toString(), "utf-8");
            httpPost.setEntity(stringEntity);
            // 执行http请求
            response = httpClient.execute(httpPost);
            result = EntityUtils.toString(response.getEntity(), "utf-8");
            System.out.println(result);
         catch (Exception e) 
            e.printStackTrace();//此处不用return，不管前面是否有异常都不会执行此处的return代码
            result = resultBackUp;//异常时执行这句
         finally //不管是否有异常，都会执行finally
            try 
                response.close();
                httpClient.close();
             catch (IOException e) 
                e.printStackTrace();
                return resultBackUp;//close异常时返回
            
            return result;//close无异常时返回
        
    

end