解决网络图片不展示的问题

jshERP-boot/src/main/java/com/jsh/erp/controller/SystemConfigController.java

@@ -6,6 +6,7 @@ import com.jsh.erp.service.systemConfig.SystemConfigService;
 import com.jsh.erp.service.user.UserService;
 import com.jsh.erp.service.userBusiness.UserBusinessService;
 import com.jsh.erp.utils.BaseResponseInfo;
+import com.jsh.erp.utils.FileUtils;
 import com.jsh.erp.utils.StringUtil;
 import io.swagger.annotations.Api;
 import io.swagger.annotations.ApiOperation;
@@ -246,14 +247,17 @@ public class SystemConfigController {
                 imgPath = imgPath.substring(0, imgPath.length() - 1);
             }
             String fileUrl = "";
+            File file = null;
             if(fileUploadType == 1) {
                 fileUrl = systemConfigService.getFileUrlLocal(imgPath);
+                file = new File(fileUrl);
             } else if(fileUploadType == 2) {
                 fileUrl = systemConfigService.getFileUrlAliOss(imgPath);
+                file = FileUtils.UrltoFile(fileUrl);
             }
             int index = fileUrl.lastIndexOf(".");
             String ext = fileUrl.substring(index + 1);
-            BufferedImage image = systemConfigService.getImageMini(fileUrl, 40);
+            BufferedImage image = systemConfigService.getImageMini(file, 40);
             outputStream = response.getOutputStream();
             ImageIO.write(image, ext, outputStream);
             response.flushBuffer();

jshERP-boot/src/main/java/com/jsh/erp/service/systemConfig/SystemConfigService.java

@@ -35,7 +35,10 @@ import javax.imageio.ImageIO;
 import javax.servlet.http.HttpServletRequest;
 import java.awt.*;
 import java.awt.image.BufferedImage;
-import java.io.*;
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
 import java.util.Date;
 import java.util.List;
 
@@ -290,8 +293,8 @@ public class SystemConfigService {
         return linkUrl + filePath + "/" + imgPath;
     }
 
-    public BufferedImage getImageMini(String fileUrl, int w) throws Exception {
+    public BufferedImage getImageMini(File file, int w) throws Exception {
-        BufferedImage img = ImageIO.read(new File(fileUrl));
+        BufferedImage img = ImageIO.read(file);
         //获取图片的长和宽
         int width = img.getWidth();
         int height = img.getHeight();

jshERP-boot/src/main/java/com/jsh/erp/utils/FileUtils.java

@@ -2,6 +2,8 @@ package com.jsh.erp.utils;
 
 import org.springframework.util.StringUtils;
 import java.io.*;
+import java.net.HttpURLConnection;
+import java.net.URL;
 import java.util.*;
 
 /**
@@ -352,4 +354,25 @@ public class FileUtils {
 		return fileName;
 	}
 
+	//将Url转换为File
+	public static File UrltoFile(String url) throws Exception {
+		HttpURLConnection httpUrl = (HttpURLConnection) new URL(url).openConnection();
+		httpUrl.connect();
+		InputStream ins=httpUrl.getInputStream();
+		File file = new File(System.getProperty("java.io.tmpdir") + File.separator + "xie");//System.getProperty("java.io.tmpdir")缓存
+		if (file.exists()) {
+			file.delete();//如果缓存中存在该文件就删除
+		}
+		OutputStream os = new FileOutputStream(file);
+		int bytesRead;
+		int len = 8192;
+		byte[] buffer = new byte[len];
+		while ((bytesRead = ins.read(buffer, 0, len)) != -1) {
+			os.write(buffer, 0, bytesRead);
+		}
+		os.close();
+		ins.close();
+		return file;
+
+	}
 }