test(oss): 添加 OSS 文件下载测试用例

- 新增OssTest 类，包含文件下载测试方法
- 在 OssUtils 类中添加 downloadFile 方法实现文件下载功能

ruoyi-admin/src/test/java/com/fjp/lc/test/service/OssTest.java

@@ -0,0 +1,23 @@
+package com.fjp.lc.test.service;
+
+import com.ruoyi.RuoYiApplication;
+import com.ruoyi.common.utils.OssUtils;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.NONE, classes = RuoYiApplication.class)
+@ActiveProfiles("dev")
+public class OssTest {
+
+    @Autowired
+    private OssUtils ossUtils;
+    @Test
+    public void download() throws Throwable {
+        ossUtils.downloadFile("306da8f7f6491046ba86633e4de8240b84微信图片_20220606114231.jpg");
+    }
+}

ruoyi-common/src/main/java/com/ruoyi/common/utils/OssUtils.java

@@ -3,6 +3,7 @@ package com.ruoyi.common.utils;
 import cn.hutool.core.date.DateTime;
 import com.aliyun.oss.OSS;
 import com.aliyun.oss.OSSClientBuilder;
+import com.aliyun.oss.model.DownloadFileRequest;
 import com.ruoyi.common.utils.uuid.UUID;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Component;
@@ -26,6 +27,13 @@ public class OssUtils {
     @Value("${aliyun.oss.bucketName}")
     private String bucketName;
 
+    public void downloadFile(String fileName) throws Throwable {
+        // 创建OSSClient实例。
+        OSS ossClient = new OSSClientBuilder().build(endPoint, accessKeyId, secretAccessKey);
+        DownloadFileRequest downloadFileRequest = new DownloadFileRequest(bucketName, fileName);
+        ossClient.downloadFile(downloadFileRequest);
+    }
+
     public String uploadOneFile(MultipartFile file) {
 
         // 创建OSSClient实例。