(add)[整体](增加缩略图接口)

pom.xml

@@ -161,6 +161,12 @@
             <artifactId>nginxparser</artifactId>
             <version>0.9.6</version>
         </dependency>
+        <!-- 图片处理 -->
+        <dependency>
+            <groupId>net.coobird</groupId>
+            <artifactId>thumbnailator</artifactId>
+            <version>0.4.14</version>
+        </dependency>
     </dependencies>
 
     <build>

src/main/java/com/laker/admin/config/WebMvcConfig.java

@@ -34,7 +34,8 @@ public class WebMvcConfig implements WebMvcConfigurer {
                         "/error",
                         "/swagger-resources/**",
                         "/api/v1/login",
-                        "/captcha");
+                        "/captcha",
+                        "/thumbnail");
     }
 
     @Override

src/main/java/com/laker/admin/framework/utils/EasyImageUtils.java

+package com.laker.admin.framework.utils;
+
+import net.coobird.thumbnailator.Thumbnails;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.URL;
+
+/**
+ * @author laker
+ * 图片处理类
+ */
+public class EasyImageUtils {
+
+
+    /**
+     * 按照宽高尺寸压缩图片，
+     *
+     * @param sourceUrl 图片url
+     * @param out       输出的流 预览流
+     * @param width
+     * @param height
+     * @throws IOException
+     */
+    public static void compressBysize(String sourceUrl, OutputStream out, int width, int height) throws IOException {
+        Thumbnails
+                .of(new URL(sourceUrl))
+                .width(width)
+                .height(height)
+                .toOutputStream(out);
+    }
+
+    public static void scale(String source, String out, double scale) throws IOException {
+        Thumbnails
+                .of(source)
+                .scale(scale)
+                .size(100, 100)
+                .toFile(out);
+    }
+
+}

src/main/java/com/laker/admin/module/sys/controller/IndexController.java

 package com.laker.admin.module.sys.controller;
 
+import cn.hutool.core.io.FileUtil;
 import cn.hutool.core.lang.Dict;
 import cn.hutool.core.util.IdUtil;
-import com.laker.admin.framework.model.Response;
 import com.laker.admin.framework.cache.ICache;
+import com.laker.admin.framework.model.Response;
+import com.laker.admin.framework.utils.EasyImageUtils;
 import com.wf.captcha.ArithmeticCaptcha;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.ResponseBody;
 
+import javax.servlet.http.HttpServletResponse;
+import java.io.BufferedOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
 /**
  * /admin/** 无需check login
  */
@@ -50,4 +58,31 @@ public class IndexController {
 
         return Response.ok(Dict.create().set("uid", uid).set("image", captcha.toBase64()));
     }
+
+    /**
+     * 缩略图
+     * http://localhost:8080/thumbnail?url=http://localhost:8080/admin/admin/images/wx.jpg
+     */
+    @GetMapping("/thumbnail")
+    public void thumbnail(String url, HttpServletResponse response,
+                          @RequestParam(required = false, defaultValue = "1") int type,
+                          @RequestParam(required = false, defaultValue = "100") int width,
+                          @RequestParam(required = false, defaultValue = "100") int height) throws IOException {
+        OutputStream out = new BufferedOutputStream(response.getOutputStream());
+        switch (type) {
+            case 1: // 预览
+                response.setContentType("image/" + FileUtil.getSuffix(url) + "; charset=utf-8");
+                break;
+            case 2: // 下载
+                response.addHeader("Content-Disposition", "attachment;filename="
+                        + new String(FileUtil.mainName(url).getBytes("utf-8"), "iso-8859-1") + "." + FileUtil.getSuffix(url));
+                response.setContentType("application/octet-stream");
+                break;
+            default:
+                response.setContentType("image/" + FileUtil.getSuffix(url) + "; charset=utf-8");
+
+        }
+        EasyImageUtils.compressBysize(url, out, width, height);
+    }
+
 }
\ No newline at end of file

src/test/java/com/laker/admin/service/EasyImageUtilsTest.java

+package com.laker.admin.service;
+
+import net.coobird.thumbnailator.Thumbnails;
+
+import java.io.IOException;
+
+public class EasyImageUtilsTest {
+
+    public static void main(String[] args) throws IOException {
+        size("d://1.jpg", "d://laker_200x300.jpg");
+    }
+
+    public static void size(String source, String out) throws IOException {
+        Thumbnails
+                .of(source)
+                .size(100, 100)
+                .toFile(out);
+    }
+}