feat: 增加书籍导出功能

.idea/GitCommitMessageStorage.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GitCommitMessageStorage">
+    <option name="messageStorage">
+      <MessageStorage />
+    </option>
+  </component>
+</project>

src/main/kotlin/com/lanyuanxiaoyao/bookstore/controller/BookController.kt

@@ -1,10 +1,14 @@
 package com.lanyuanxiaoyao.bookstore.controller
 
+import cn.hutool.core.io.IoUtil
 import cn.hutool.core.util.IdUtil
+import cn.hutool.core.util.StrUtil
+import cn.hutool.core.util.URLUtil
 import com.lanyuanxiaoyao.bookstore.Book
 import com.lanyuanxiaoyao.bookstore.BookRepository
 import com.lanyuanxiaoyao.bookstore.PageResponse
 import jakarta.annotation.Resource
+import jakarta.servlet.http.HttpServletResponse
 import jakarta.transaction.Transactional
 import org.slf4j.LoggerFactory
 import org.springframework.data.domain.PageRequest
@@ -27,7 +31,7 @@ class BookController {
     @GetMapping("list")
     fun list(
         @RequestParam("page", defaultValue = "1") page: Int,
-        @RequestParam("size", defaultValue = "10") size: Int
+        @RequestParam("size", defaultValue = "10") size: Int,
     ): PageResponse<ViewItem> {
         val pageable = bookRepository.findAll(PageRequest.of(0.coerceAtLeast(page - 1), size))
         return PageResponse(
@@ -67,6 +71,30 @@ class BookController {
         return bookRepository.findAllTag()
     }
 
+    @Transactional
+    @GetMapping("export/{bookId}")
+    fun export(@PathVariable("bookId") bookId: String, response: HttpServletResponse) {
+        val book = bookRepository.findById(bookId).orElseThrow()
+        val builder = StringBuilder()
+        for (chapter in book.chapters.sortedBy { it.sequence }) {
+            if (chapter.name.isNullOrBlank()) {
+                builder.appendLine("第${chapter.sequence}章")
+            } else {
+                builder.appendLine("第${chapter.sequence}章 ${chapter.name}")
+            }
+            builder.appendLine()
+            for (line in chapter.content.sortedBy { it.sequence }) {
+                builder.appendLine(line.text)
+            }
+            builder.appendLine()
+        }
+        response.setHeader("Access-Control-Expose-Headers", "Content-Type")
+        response.setHeader("Content-Type", "text/plain")
+        response.setHeader("Access-Control-Expose-Headers", "Content-Disposition")
+        response.setHeader("Content-Disposition", StrUtil.format("attachment; filename={}", URLUtil.encodeAll("${book.name}.txt")))
+        IoUtil.copy(builder.toString().byteInputStream(), response.outputStream)
+    }
+
     data class ViewItem(
         val bookId: String?,
         val name: String,

src/main/resources/static/index.html

@@ -76,7 +76,7 @@
                             label: '操作',
                             fixed: 'right',
                             className: 'nowrap',
-                            width: 250,
+                            width: 100,
                             buttons: [
                                 {
                                     type: 'action',
@@ -85,6 +85,12 @@
                                     url: '${source}',
                                     blank: true,
                                 },
+                                {
+                                    type: 'action',
+                                    label: '导出',
+                                    actionType: 'download',
+                                    api: '${base}/book/export/${bookId}',
+                                },
                                 {
                                     type: 'action',
                                     label: '编辑',