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腾讯云COS直传，官方后端demo，GO写的，我们台是JAVA所以转一下，已跑通。废话不多说，直接上代码：

Controller类如下：

import com.ruoyi.web.core.config.CosConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.util.*;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

@RestController
@CrossOrigin(origins = "http://127.0.0.1:8080", allowedHeaders = "origin,accept,content-type")
@RequestMapping
public class CosController {

    @Autowired
    private CosConfig config;

    @GetMapping("/post-policy")
    public ResponseEntity<Map<String, Object>> getPostPolicy(@RequestParam String ext) {
        // 判断异常情况
        if (config.getSecretId() == null || config.getSecretKey() == null) {
            return buildErrorResponse("-1", "secretId or secretKey not ready");
        }
        if (config.getBucket() == null || config.getR