update hotswap-version

Author: litongjava

docs/zh/01_tio-boot 简介/05.md

@@ -28,6 +28,7 @@
 <dependency>
   <groupId>com.litongjava</groupId>
   <artifactId>hotswap-classloader</artifactId>
+  <!--https://central.sonatype.com/artifact/com.litongjava/hotswap-classloader-->
   <version>${hotswap-classloader.version}</version>
 </dependency>
 ```

docs/zh/15_table-to-json/01.md

@@ -1,22 +1,24 @@
 # 使用 table-to-json 连接数据库
 
-### 11.1.整合 SQLLite 数据库
+### 整合 SQLLite 数据库
 
-#### 11.1.1.创建 sqllite 数据库
+#### 创建 数据表和插入数据
 
 sqllite 是一个嵌入式的数据库
-使用 Navicat Premium 创建 sqllite 文件
+使用 Navicat Premium 创建 sqllite 数据库,创建完整后是一个本地文件
 
 创建表,插入数据
 
+```
 CREATE TABLE "student" (
-"id" integer NOT NULL,
-"name" text NOT NULL,
-"grade" textNOT NULL,
-PRIMARY KEY ("id")
+  "id" integer NOT NULL,
+  "name" text NOT NULL,
+  "grade" textNOT NULL,
+  PRIMARY KEY ("id")
 );
 
 INSERT INTO "student" VALUES (1, '沈', '一年级');
+```
 
 #### 11.1.2.整合 sqllite
 
@@ -58,4 +60,4 @@ jdbc.showSql=true
 
 添加 Controller
 
-启动测试
+启动测试

docs/zh/99_案例/03.md

@@ -0,0 +1,76 @@
+# 文件上传和下载案例
+
+```
+import java.io.File;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class FileSaveResult {
+  private String docId;
+  private String saveFolder;
+  private String suffixName;
+  private File file;
+}
+```
+
+```
+package com.litongjava.hopto.translation.service;
+
+import java.io.File;
+import java.io.IOException;
+
+import com.litongjava.hopto.translation.constants.AppConstants;
+import com.litongjava.hopto.translation.model.FileSaveResult;
+import com.litongjava.tio.utils.hutool.FileUtil;
+
+import cn.hutool.core.lang.UUID;
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class FileService {
+
+  public FileSaveResult save(String filename, byte[] fileData) {
+    String newFilename = UUID.fastUUID().toString();
+    FileSaveResult fileSaveResult = new FileSaveResult();
+    fileSaveResult.setDocId(newFilename);
+
+    int lastIndexOf = filename.lastIndexOf(".");
+    if (lastIndexOf > 0) {
+      String substring = filename.substring(lastIndexOf);
+      fileSaveResult.setSuffixName(substring);
+      newFilename += substring;
+    }
+    // create dirs
+    File uploadFolderFile = new File(AppConstants.UPlOAD_FOLDER_NAME);
+    if (!uploadFolderFile.exists()) {
+      uploadFolderFile.mkdirs();
+      log.info("crate upload dir:{}", uploadFolderFile.getAbsolutePath());
+    }
+
+    newFilename = AppConstants.UPlOAD_FOLDER_NAME + "/" + newFilename;
+    fileSaveResult.setSaveFolder(AppConstants.UPlOAD_FOLDER_NAME);
+    log.info("newFilename:{}", newFilename);
+
+    File file = new File(newFilename);
+    try {
+      FileUtil.writeBytes(fileData, file);
+    } catch (IOException e) {
+      e.printStackTrace();
+    }
+    fileSaveResult.setFile(file);
+
+    return fileSaveResult;
+  }
+
+  public File getUploadFile(FileSaveResult result) {
+    String filename = result.getSaveFolder() + "/" + result.getDocId() + result.getSuffixName();
+    return new File(filename);
+  }
+}
+
+```