java实现微信小程序内容安全检测代码展示

以下是Java实现微信小程序内容安全检测的示例代码：

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class WxMaSecCheckUtil {

    private static final String API_URL = "https://api.weixin.qq.com/wxa/msg_sec_check?access_token=ACCESS_TOKEN";
    private static final String CHARSET = "UTF-8";

    /**
     * 调用微信内容安全检测接口
     *
     * @param accessToken 微信 access_token
     * @param content     待检测内容
     * @return boolean 是否合规，true：合规，false：不合规
     */
    public static boolean checkMsgSec(String accessToken, String content) {
        try {
            URL url = new URL(API_URL.replace("ACCESS_TOKEN", accessToken));
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", "application/json;charset=" + CHARSET);
            connection.setRequestProperty("Connection", "Keep-Alive");
            connection.connect();

            DataOutputStream out = new DataOutputStream(connection.getOutputStream());
            String postJson = "{\"content\":\"" + content + "\"}";
            out.write(postJson.getBytes(CHARSET));
            out.flush();
            out.close();

            InputStream inputStream = connection.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, CHARSET));
            StringBuffer buffer = new StringBuffer();
            String line = "";
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }
            reader.close();
            String result = buffer.toString();
            inputStream.close();
            connection.disconnect();

            // 根据返回结果判断是否合规
            if (result.indexOf("\"errcode\":0") != -1) {
                return true;
            } else {
                return false;
            }

        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 计算字符串 SHA1 值
     *
     * @param str
     * @return
     */
    private static String getSha1(String str) {
        if (str == null || str.length() == 0) {
            return null;
        }
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-1");
            md.update(str.getBytes());
            byte[] digest = md.digest();
            StringBuffer sb = new StringBuffer();
            for (int i = 0; i < digest.length; i++) {
                sb.append(String.format("%02x", digest[i]));
            }
            return sb.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
}

使用方法：

1. 替换API_URL中的ACCESS_TOKEN为实际的access_token；
2. 调用checkMsgSec方法进行内容检测，传入accessToken和待检测的内容即可。

注意：此示例仅供参考，实际使用中需要根据业务需求进行修改。同时，微信官方也提供了PHP和Node.js等语言的示例代码，可以参考官方文档进行开发。