java http 发邮件

package com.client.modules.controller;

import com.alibaba.fastjson.JSONObject;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Base64;
import java.util.HashMap;
import java.util.Map;

/**
 * @author MaiDong
 */
@RestController
@RequestMapping("/api")
@Api(description = "公用组件")
public class EmailTestController {
    private static String url = "https://xxx"; // HTTP 调用 HTTP 请求地址
    private static String key = "xxx"; // HTTP 调用 HTTP API Key

    @GetMapping("/sendEmailTest")
    @ApiOperation("发送邮件测试")
    public Object sendEmailTest(@ApiParam(value = "邮箱") String mail) {
        Base64.getDecoder().decode("");
        return 1;
    }
    public static void main(String[] args) {
        String auth = Base64.getEncoder().encodeToString(("api:" + key).getBytes());
        Map<String, String> headerMap = new HashMap<>();
        headerMap.put("Authorization", "Basic " + auth);
        Map<String, String> map = new HashMap<>();
        map.put("from", "xxx"); // 企业邮箱，格式：xxx@配置的域名地址
        map.put("to", "xxx"); // 接收邮箱
        map.put("subject", "test send 123456");
        map.put("text", "Testing email from Hedwi!");
        String result = postJson(url, JSONObject.toJSONString(map), headerMap);
        System.out.println("result: "+result);
    }

    public static String postJson(String url, String jsonBody,Map<String,String> header)  {
        String result = "";
        HttpPost httpPost = new HttpPost(url);
        CloseableHttpClient httpClient = HttpClients.createDefault();
        try {
            BasicResponseHandler handler = new BasicResponseHandler();
            StringEntity entity = new StringEntity(jsonBody, "utf-8");//解决中文乱码问题
            entity.setContentEncoding("UTF-8");
            entity.setContentType("application/json");
            httpPost.setEntity(entity);
            if(header != null && header.size() > 0){
                header.forEach((k,v)->{
                    httpPost.setHeader(k,v);
                });
            }
            result = httpClient.execute(httpPost, handler);
            return result;
        } catch (Exception e) {
            System.out.println("请求异常："+e.getMessage());
        } finally {
            try {
                httpClient.close();
            } catch (Exception e) {
                System.out.println("链接关闭异常："+e.getMessage());
            }
        }
        return result;
    }
}