Baidu Translation API integrates SpringBoot

The background of the case, according to the official demo, is too long-winded.

Rough steps

Encapsulate data>Sign>Send request,

If you look carefully, there are a lot of crackles. In the end, you have to manually close the connection. Do I have to consider memory management when integrating it into the SpringBoot project?

So there are the following requirements

use

RestTemplate object is used to send request data. RestTemplate is managed by springboot itself.

package com.example.demo2.baidu2;

import org.springframework.http.*;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.Map;

public class Trans {
    private static final String APP_ID = "自己的APPID";
    private static final String SECURITY_KEY = "自己的密钥";

    private static final String TRANS_API_HOST = "http://api.fanyi.baidu.com/api/trans/vip/translate";

    public static void main(String[] args) throws UnsupportedEncodingException {
        String query = "高度600米";


        Map<String, String> params = new HashMap<String, String>();
        params.put("q", query);
        params.put("from", "auto");
        params.put("to", "en");
        params.put("appid", APP_ID);
        // 随机数
        String salt = String.valueOf(System.currentTimeMillis());
        params.put("salt", salt);
        // 签名
        String src = APP_ID + query + salt + SECURITY_KEY; // 加密前的原文
        String md5 = getMD5(src);
        md5= md5.toLowerCase();
        params.put("sign", md5);
        String s = get(TRANS_API_HOST, params);
        System.out.println(s);

    }

    public static String get(String host, Map<String, String> params2) throws UnsupportedEncodingException {

        MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<>(params, headers);
        String s = params2.get("q");
        String salt = params2.get("salt");
        String appid = params2.get("appid");
        String to = params2.get("to");
        String from = params2.get("from");
        String sign = params2.get("sign");

//        String encode = URLEncoder.encode(s, "UTF-8");
        params.add("salt",salt);
        params.add("appid",appid);
        params.add("to",to);
        params.add("from",from);
        params.add("q",s);
        params.add("sign",sign);



        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.exchange(host, HttpMethod.POST, requestEntity, String.class);

        int statusCode = response.getStatusCodeValue();
        if (statusCode != 200) {
            System.out.println("Http错误码：" + statusCode);
        }

        return response.getBody();

    }

    public static String getMD5(String s) {
        char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        try {
            byte[] btInput = s.getBytes(StandardCharsets.UTF_8);
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            mdInst.update(btInput);
            byte[] md = mdInst.digest();
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            for (byte byte0 : md) {
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


}