From af1c88a22010ebb444e7e2378e530df014e3f878 Mon Sep 17 00:00:00 2001
From: James <zhengbaole@gmail.com>
Date: Sat, 21 Aug 2021 20:14:33 +0800
Subject: [PATCH] =?UTF-8?q?=E4=B8=8B=E8=BD=BD=E5=9B=BE=E7=89=87=E6=B7=BB?=
 =?UTF-8?q?=E5=8A=A0=E8=BF=9E=E6=8E=A5=E5=92=8C=E8=AF=BB=E5=8F=96=E7=9A=84?=
 =?UTF-8?q?=E8=B6=85=E6=97=B6=E8=AE=BE=E7=BD=AE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

在默认情况下，如果连接成功建立，但是下载速度极慢，在 Spring Web 应用中同步执行 Excel 的导出任务，会造成线程长时间被占用，最终造成 Tomcat 连接数超限，对应用造成毁灭性灾难。
---
 .../alibaba/excel/converters/url/UrlImageConverter.java  | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/alibaba/excel/converters/url/UrlImageConverter.java b/src/main/java/com/alibaba/excel/converters/url/UrlImageConverter.java
index b622d66d..d178a5e9 100644
--- a/src/main/java/com/alibaba/excel/converters/url/UrlImageConverter.java
+++ b/src/main/java/com/alibaba/excel/converters/url/UrlImageConverter.java
@@ -3,6 +3,7 @@ package com.alibaba.excel.converters.url;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URL;
+import java.net.URLConnection;
 
 import com.alibaba.excel.converters.Converter;
 import com.alibaba.excel.enums.CellDataTypeEnum;
@@ -39,8 +40,12 @@ public class UrlImageConverter implements Converter<URL> {
         GlobalConfiguration globalConfiguration) throws IOException {
         InputStream inputStream = null;
         try {
-            inputStream = value.openStream();
-            byte[] bytes = IoUtils.toByteArray(inputStream);
+            
+            URLConnection conn = value.openConnection();
+            conn.setConnectTimeout(1000);
+            conn.setReadTimeout(5000);
+            inputStream = con.getInputStream();
+            byte[] bytes = IoUtils.toByteArray(inputStream);    
             return new CellData(bytes);
         } finally {
             if (inputStream != null) {