java.net.Url POST请求

java 原生java.net.Url POST请求

1.关键代码

• 请求链接 URL u = new URL(“http://www.bowen-tech.top“);
• 设置发送数据的格式为form表单 conn.setRequestProperty(“Content-Type”, “application/x-www-form-urlencoded; charset=UTF-8”);
• 设置是否向connection输出，因为这个是post请求，参数要放在http正文内，因此需要设为true connection.setDoOutput(true);
• 防止乱码，设置编码为UTF-8
  BufferedReader in = new BufferedReader( new InputStreamReader(conn.getInputStream(), “utf-8”));

public static String getPost(Map<String, Object> params) throws Exception {
        //请求链接
        URL u = new URL("http://www.bowen-tech.top");
        //获取连接对象
        HttpURLConnection conn=(HttpURLConnection) u.openConnection();
        conn.setRequestProperty("Accept", "application/json, text/javascript, */*; q=0.01");
        conn.setRequestProperty("User-Agent", "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0))");
        conn.setRequestProperty("Referer"," http://www.bowen-tech.top");
        conn.setRequestProperty("Cookie", "");
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); // 设置发送数据的格式为form表单
        conn.setRequestProperty("timeout","3000");
        conn.setDoOutput(true);
        conn.setRequestMethod("POST"); // 设置请求方式
        // 打开请求正文输出流
        OutputStream os = conn.getOutputStream();
        // 写入输出数据，刷新缓存，关闭输出流
//        StringBuilder content = "字段名=" + URLEncoder.encode("字符串值", "编码");
        StringBuilder content = new StringBuilder();
        for (String key : params.keySet()) {
            content.append(key+"="+ params.get(key)+"&");
        }
        System.out.println(content.toString());
        os.write(content.toString().getBytes());
        os.flush();
        os.close();
        // 7. 发起请求并获取请求响应状态码
        int responseCode = conn.getResponseCode();
        StringBuffer sb=new StringBuffer();
        //获取输入流
        BufferedReader in = new BufferedReader( new InputStreamReader(conn.getInputStream(), "utf-8"));
        String line = "";
        while ((line = in.readLine()) != null) {
            sb.append(line);
        }
        in.close();
        System.out.println(sb.toString());
        return sb.toString();
    }