java調用post 傳遞參數

廢話不說，上代碼：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;

public class cs {
    /**
     * @Description: post 請求
     * @Author: ckx
     * @Date: 2019/9/23 13:08 
     *  args：url
     *  args1 ： 參數
     */
    public static String jsonpost(String args, String args1) {
        OutputStreamWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        try {
            URL realUrl = new URL(args);
            // 打開和URL之間的連接
            URLConnection conn = realUrl.openConnection();
            //設置通用的請求頭屬性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 發送POST請求必須設置如下兩行   否則會拋異常（java.net.ProtocolException: cannot write to a URLConnection if doOutput=false - call setDoOutput(true)）
            conn.setDoOutput(true);
            conn.setDoInput(true);
            //獲取URLConnection對象對應的輸出流並開始發送參數
            out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
            //添加參數
            out.write(args1);
            out.flush();
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {// 使用finally塊來關閉輸出流、輸入流
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
        return result.toString();
    }
}

測試;

    public static void main(String[] args) {
        String result = jsonpost("http://ip:28888/api/getToken", "&username=1&passwd=111111");
        System.out.println(result);
    }

結果：

{
    "code": 200,
    "msg": "token獲取成功",
}