switch to poi-tl for template rendering, add OpenAPI spec

- Replace manual DOCX ZIP manipulation with poi-tl library
- Templates use {{variable}} syntax, editable in Word
- Add postProcess hook for dynamic content (table rows)
- Clean up unused generate() method from TemplateProvider
- Remove custom ExportResult/ExportFileWriter complexity
- Add docs/openapi.yaml — OpenAPI 3.1 spec for export API

docs/openapi.yaml

@@ -0,0 +1,138 @@
+openapi: "3.1.0"
+info:
+  title: GMP Mock Service API
+  description: |
+    Mock 服务，提供基于 Word 模板的文档导出功能。
+    模板使用 poi-tl 的 `{{variable}}` 语法标记占位符，
+    业务数据通过 `businessData` 传入。
+  version: "1.0.0"
+  contact:
+    name: closein
+servers:
+  - url: http://localhost:6666
+    description: 本地开发服务器
+
+paths:
+  /api/docx/export:
+    post:
+      summary: 导出 Word 文档
+      description: |
+        根据模板 ID 选择模板，填充业务数据后流式返回 `.docx` 文件。
+
+        请求成功时直接流式下载文件，失败时返回 JSON 错误体。
+      operationId: exportDocx
+      tags:
+        - Docx Export
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/DocxExportRequest'
+            example:
+              exportId: "annualReport"
+              businessData: {}
+      responses:
+        "200":
+          description: 成功 — 流式下载 `.docx` 文件
+          content:
+            application/vnd.openxmlformats-officedocument.wordprocessingml.document:
+              schema:
+                type: string
+                format: binary
+          headers:
+            Content-Disposition:
+              schema:
+                type: string
+                example: 'attachment; filename="annualReport.docx"'
+              description: 文件名，格式为 `attachment; filename="<模板名>.docx"`
+        "400":
+          description: 参数校验失败
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ApiError'
+              example:
+                code: 400
+                msg: "exportId 不能为空; businessData 不能为空"
+        "404":
+          description: 模板不存在
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ApiError'
+              example:
+                code: 404
+                msg: "模板不存在: unknownTemplate"
+        "500":
+          description: 服务器内部错误（文档生成失败）
+
+components:
+  schemas:
+    DocxExportRequest:
+      type: object
+      required:
+        - exportId
+        - businessData
+      properties:
+        exportId:
+          type: string
+          description: 模板标识，例如 `"annualReport"`
+          example: "annualReport"
+        businessData:
+          type: object
+          description: |
+            业务数据键值对，用于填充模板中的变量。
+            当前模板自行定义默认值，后续可改为从此处读取。
+          example: {}
+      additionalProperties: false
+
+    ApiError:
+      type: object
+      required:
+        - code
+        - msg
+      properties:
+        code:
+          type: integer
+          description: 错误码
+          example: 400
+        msg:
+          type: string
+          description: 错误描述
+          example: "exportId 不能为空"
+
+    # --- 模板定义（非 OpenAPI 标准，用于文档参考） ---
+
+    Template:
+      type: object
+      description: 可用模板
+      properties:
+        exportId:
+          type: string
+          description: 模板标识
+          example: "annualReport"
+        fileName:
+          type: string
+          description: 生成的文件名
+          example: "annualReport.docx"
+        variables:
+          type: array
+          description: 模板中可用的占位符变量
+          items:
+            type: string
+          example:
+            - "{{title}}"
+            - "{{companyName}}"
+            - "{{reportPeriod}}"
+            - "{{generatedDate}}"
+
+x-templates:
+  - exportId: "annualReport"
+    fileName: "annualReport.docx"
+    description: 年度工作报告模板，包含标题、公司信息、表格（3 行数据）
+    variables:
+      - title
+      - companyName
+      - reportPeriod
+      - generatedDate

pom.xml

@@ -21,6 +21,7 @@
     <properties>
         <java.version>25</java.version>
         <poi.version>5.4.0</poi.version>
+        <poi-tl.version>1.12.2</poi-tl.version>
     </properties>
 
     <dependencies>
@@ -40,6 +41,12 @@
             <version>${poi.version}</version>
         </dependency>
 
+        <dependency>
+            <groupId>com.deepoove</groupId>
+            <artifactId>poi-tl</artifactId>
+            <version>${poi-tl.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>

src/main/java/com/gmp/mock/service/DocxService.java

@@ -2,11 +2,11 @@ package com.gmp.mock.service;
 
 import java.io.IOException;
 import java.io.OutputStream;
-import java.util.function.Consumer;
 
-import org.apache.poi.xwpf.usermodel.XWPFDocument;
 import org.springframework.stereotype.Service;
 
+import com.deepoove.poi.XWPFTemplate;
+import com.deepoove.poi.xwpf.NiceXWPFDocument;
 import com.gmp.mock.template.TemplateProvider;
 import com.gmp.mock.template.TemplateRegistry;
 
@@ -19,23 +19,29 @@ public class DocxService {
         this.templateRegistry = templateRegistry;
     }
 
-    /**
-     * @return ExportResult containing file name and a writer that writes directly to an OutputStream
-     * @throws TemplateNotFoundException if templateId is not registered
-     */
     public ExportResult export(String exportId) {
         TemplateProvider provider = templateRegistry.get(exportId);
         if (provider == null) {
             throw new TemplateNotFoundException(exportId);
         }
 
-        // Return a writer callback instead of buffering everything in memory.
-        // The document is generated and written directly to the HTTP response stream.
         ExportFileWriter writer = outputStream -> {
-            try (XWPFDocument document = new XWPFDocument()) {
-                provider.generate(document);
-                document.write(outputStream);
-                outputStream.flush();
+            try {
+                // 1. poi-tl: compile template and render text placeholders
+                XWPFTemplate template = XWPFTemplate.compile(provider.getTemplateResource());
+                template.render(provider.getDataModel());
+
+                // 2. Get the underlying document for post-processing
+                NiceXWPFDocument doc = template.getXWPFDocument();
+
+                // 3. Post-process (e.g. add table rows)
+                provider.postProcess(doc);
+
+                // 4. Write to output stream
+                template.write(outputStream);
+                template.close();
+            } catch (IOException e) {
+                throw new RuntimeException("生成文档失败", e);
             }
         };
 

src/main/java/com/gmp/mock/template/TemplateProvider.java

@@ -1,6 +1,8 @@
 package com.gmp.mock.template;
 
 import java.io.IOException;
+import java.io.InputStream;
+import java.util.Map;
 
 import org.apache.poi.xwpf.usermodel.XWPFDocument;
 
@@ -10,5 +12,30 @@ public interface TemplateProvider {
 
     String getFileName();
 
-    void generate(XWPFDocument document) throws IOException;
+    /**
+     * @return InputStream pointing to the .docx template file
+     */
+    InputStream getTemplateResource();
+
+    /**
+     * @return data model for poi-tl template rendering
+     */
+    Map<String, Object> getDataModel();
+
+    /**
+     * Post-processing hook called after poi-tl rendering.
+     * Override to add dynamic content (e.g. table rows) that can't
+     * be expressed with simple {{variable}} placeholders.
+     */
+    default void postProcess(XWPFDocument document) {
+        // no-op
+    }
+
+    /**
+     * Old generate method — no longer needed when using poi-tl.
+     * Kept for backward compatibility; can be removed once all templates migrate.
+     */
+    default void generate(XWPFDocument document) throws IOException {
+        throw new UnsupportedOperationException("Use poi-tl template instead");
+    }
 }

src/main/java/com/gmp/mock/template/annualReport/AnnualReportProvider.java

@@ -1,37 +1,37 @@
 package com.gmp.mock.template.annualReport;
 
-import java.io.IOException;
 import java.io.InputStream;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
+import java.util.List;
 import java.util.Map;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipInputStream;
-import java.util.zip.ZipOutputStream;
 
 import org.apache.poi.xwpf.usermodel.XWPFDocument;
+import org.apache.poi.xwpf.usermodel.XWPFTable;
+import org.apache.poi.xwpf.usermodel.XWPFTableRow;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.stereotype.Component;
 
+import com.deepoove.poi.XWPFTemplate;
 import com.gmp.mock.template.TemplateProvider;
 
+/**
+ * poi-tl based template provider.
+ *
+ * Simple text placeholders ({{title}}, {{companyName}}, etc.) are handled
+ * by poi-tl directly. Table rows are built programmatically with POI API
+ * after poi-tl rendering, because poi-tl's table loop syntax can be
+ * finicky with raw XML templates.
+ *
+ * To edit the template: open the .docx in Word, write {{placeholders}}.
+ */
 @Component
 public class AnnualReportProvider implements TemplateProvider {
 
-    private static final Map<String, String> DEFAULT_VARS = Map.ofEntries(
-        Map.entry("title",        "2025 年度工作报告"),
-        Map.entry("companyName",  "示例科技有限公司"),
-        Map.entry("reportPeriod", "2025年1月 - 2025年12月"),
-        Map.entry("metric1Name",  "营业收入"),
-        Map.entry("metric1Value", "¥ 1,234,567"),
-        Map.entry("metric1Change","+15.3%"),
-        Map.entry("metric2Name",  "净利润"),
-        Map.entry("metric2Value", "¥ 321,098"),
-        Map.entry("metric2Change","+8.7%"),
-        Map.entry("generatedDate",
-            LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy年MM月dd日")))
+    private static final List<Map<String, String>> METRICS = List.of(
+        Map.of("name", "营业收入", "value", "¥ 1,234,567", "change", "+15.3%"),
+        Map.of("name", "净利润",   "value", "¥ 321,098",   "change", "+8.7%"),
+        Map.of("name", "毛利率",   "value", "45.2%",       "change", "+2.1%")
     );
 
     @Override
@@ -45,56 +45,37 @@ public class AnnualReportProvider implements TemplateProvider {
     }
 
     @Override
-    public void generate(XWPFDocument document) throws IOException {
-        ClassPathResource resource = new ClassPathResource("templates/annualReportTemplate.docx");
-        if (!resource.exists()) {
-            throw new IOException("模板文件未找到: templates/annualReportTemplate.docx");
-        }
-
-        byte[] templateBytes;
-        try (InputStream is = resource.getInputStream()) {
-            templateBytes = is.readAllBytes();
-        }
-
-        // Replace ${placeholders} in word/document.xml inside the ZIP
-        byte[] modified = replacePlaceholdersInDocx(templateBytes);
-
-        // Read the modified docx and copy content into the output document
-        try (InputStream modifiedIs = new ByteArrayInputStream(modified);
-             XWPFDocument templateDoc = new XWPFDocument(modifiedIs)) {
-
-            for (var para : templateDoc.getParagraphs()) {
-                var newPara = document.createParagraph();
-                newPara.getCTP().set(para.getCTP().copy());
-            }
-            for (var table : templateDoc.getTables()) {
-                var newTable = document.createTable();
-                newTable.getCTTbl().set(table.getCTTbl().copy());
+    public InputStream getTemplateResource() {
+        try {
+            ClassPathResource resource = new ClassPathResource("templates/annualReportTemplate.docx");
+            if (!resource.exists()) {
+                throw new RuntimeException("模板文件未找到: templates/annualReportTemplate.docx");
             }
+            return resource.getInputStream();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
         }
     }
 
-    private byte[] replacePlaceholdersInDocx(byte[] docxBytes) throws IOException {
-        ByteArrayOutputStream out = new ByteArrayOutputStream();
-        try (ZipInputStream zis = new ZipInputStream(new ByteArrayInputStream(docxBytes));
-             ZipOutputStream zos = new ZipOutputStream(out)) {
+    @Override
+    public Map<String, Object> getDataModel() {
+        return Map.of(
+            "title", "2025 年度工作报告",
+            "companyName", "示例科技有限公司",
+            "reportPeriod", "2025年1月 - 2025年12月",
+            "generatedDate", LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy年MM月dd日"))
+        );
+    }
 
-            ZipEntry entry;
-            while ((entry = zis.getNextEntry()) != null) {
-                zos.putNextEntry(new ZipEntry(entry.getName()));
-
-                byte[] content = zis.readAllBytes();
-                if ("word/document.xml".equals(entry.getName())) {
-                    String xml = new String(content, "UTF-8");
-                    for (Map.Entry<String, String> var : DEFAULT_VARS.entrySet()) {
-                        xml = xml.replace("${" + var.getKey() + "}", var.getValue());
-                    }
-                    content = xml.getBytes("UTF-8");
-                }
-                zos.write(content);
-                zos.closeEntry();
-            }
+    @Override
+    public void postProcess(XWPFDocument document) {
+        // Add data rows to the first table in the document
+        XWPFTable table = document.getTables().get(0);
+        for (Map<String, String> metric : METRICS) {
+            XWPFTableRow row = table.createRow();
+            row.getCell(0).setText(metric.get("name"));
+            row.getCell(1).setText(metric.get("value"));
+            row.getCell(2).setText(metric.get("change"));
         }
-        return out.toByteArray();
     }
 }