Java通过https http协议来调用第三方接口

一、通过https协议

public static String getSqm(String nssbh){ //请求参数 String sqmParm = createSqmParm(nssbh); System.out.println(sqmParm); //返回结果 String sqmRes = ""; PrintWriter out = null; BufferedReader in = null; try { trustAllHosts(); java.net.URL realUrl = new URL("https://api.yunpiao.net/openNozzle"); HttpsURLConnection conn = (HttpsURLConnection) realUrl.openConnection(); conn.setHostnameVerifier(DO_NOT_VERIFY); // 设置通用的请求属性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); conn.setRequestProperty("Content-Type", "text/plain;charset=utf-8"); // 发送POST请求必须设置如下两行 conn.setDoOutput(true); conn.setDoInput(true); // 获取URLConnection对象对应的输出流 out = new PrintWriter(conn.getOutputStream()); // 发送请求参数 out.print(sqmParm); // flush输出流的缓冲 out.flush(); // 定义BufferedReader输入流来读取URL的响应 in = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line; while ((line = in.readLine()) != null) { sqmRes += line; } } catch (Exception e) { e.printStackTrace(); } finally {// 使用finally块来关闭输出流、输入流 try { if (out != null) { out.close(); } if (in != null) { in.close(); } } catch (IOException ex) { ex.printStackTrace(); } } return sqmRes; }

我在测试的时候曾经出错过，报错为javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?

这个报错的原因是，第三方服务器不是https协议，是http服务，我换成http调用就可以了

二、http协议

public static String doBillManage(String nssbh){
        String parm = createBillManageParm(nssbh);
        String result = "";
        PrintWriter out = null;
        BufferedReader in = null;
        try {
            java.net.URL realUrl;
            realUrl = new URL("http：//locahost:8080/aa.do");
//            realUrl = new URL(null,BaiWangUtil.URL,new Handler());
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            conn.setRequestMethod("POST");
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setRequestProperty("Content-Type", "text/plain;charset=utf-8");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            BASE64Encoder base64Encoder = new BASE64Encoder();
            out.print(base64Encoder.encode(parm.getBytes()));
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
            System.out.println(result);
            BASE64Decoder base64Decoder = new BASE64Decoder();
            byte[] bytes = base64Decoder.decodeBuffer(result);
            String res = new String(bytes, "UTF-8");
            System.out.println(res);
            Base64.getDecoder().decode(result.getBytes());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {// 使用finally块来关闭输出流、输入流
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
        return result;
    }