新增pdf预览

src/main/java/cn/stylefeng/guns/modular/demos/controller/PdfPreviewController.java

+/**
+ * Copyright 2018-2020 stylefeng & fengshuonan (https://gitee.com/stylefeng)
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package cn.stylefeng.guns.modular.demos.controller;
+
+import cn.stylefeng.roses.core.base.controller.BaseController;
+import cn.stylefeng.roses.core.util.ToolUtil;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+import java.io.IOException;
+
+/**
+ * pdf预览
+ *
+ * @author fengshuonan
+ * @Date 2017年2月17日20:27:22
+ */
+@Controller
+@Slf4j
+public class PdfPreviewController extends BaseController {
+
+    private String PREFIX = "/modular/demos/pdf/";
+
+    /**
+     * pdf预览
+     */
+    @RequestMapping("/pdf")
+    public String pdf() {
+        return PREFIX + "pdf.html";
+    }
+
+    /**
+     * 预览
+     */
+    @GetMapping(value = "/loadPdfFile", produces = "application/pdf")
+    @ResponseBody
+    public FileSystemResource loadPdfFile(@RequestParam(value = "file", required = false) String file) {
+
+        if (ToolUtil.isEmpty(file)) {
+            file = "demo.pdf";
+        }
+
+        try {
+            ClassPathResource classPathResource = new ClassPathResource("assets/common/pdf/demo/" + file);
+            return new FileSystemResource(classPathResource.getFile().getAbsolutePath());
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+}