问题：Flutter create新建项目之后运行，一直报错显示Exception in thread "main" java.net.ConnectException: Connection timed out: connect

Exception in thread "main" java.net.ConnectException: Connection timed out: connect        at java.net.DualStackPlainSocketImpl.connect0(Native Method)            at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)             at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)           at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)        at java.net.Socket.connect(Socket.java:589)        at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:666)        at sun.security.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:173)        at sun.net.NetworkClient.doConnect(NetworkClient.java:180)        at sun.net.          at sun.net.        at sun.net.;init>(HttpsClient.java:264)        at sun.net.        at sun.net.        at sun.net.        at sun.net.        at sun.net.        at sun.net.        at sun.net.        at org.gradle.wrapper.Download.downloadInternal(Download.java:58)        at org.gradle.wrapper.Download.download(Download.java:44)        at org.gradle.wrapper.Install$1.call(Install.java:61)        at org.gradle.wrapper.Install$1.call(Install.java:48)        at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65)          at org.gradle.wrapper.Install.createDist(Install.java:48)        at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:128)        at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)Running Gradle task 'assembleDebug'...Running Gradle task 'assembleDebug'... Done                        26.4sException: Gradle task assembleDebug failed with exit code 1

其实主要估计就是网络超时问题，我上网搜了一波发现都建议

需要修改项目下 android/build.gradle 和 flutter 安装目录flutter/packages/flutter_tools/gradle/flutter.gradle 两个文件中 buildscript 和allprojects 中的

google()jcenter()

替换成阿里云镜像

maven { url '; }maven { url '; }maven { url'; }

但是我替换后还是回显示同样的错误，开始思考其实之所以这样修改，是因为更快下载到需要的gradle.zip文件,所以我就直接在这里下载我所需要的grade文件直接引用本地的来运行，结果成功运行了

步骤一：到你项目里面的gradle-wrapper.properties文件里面查找到你所需要的版本，我这里是gradle-6.7-all.zip

步骤二：到这里找到对应的版本下载

步骤三：找到你的.grade地方，我电脑所在是 C:\Users\husk\.gradle ，然后将刚刚下载成功的zip包放在该目录下（其实你喜欢放在哪都无所谓，反正到时候引入本地这个zip就好）

步骤四：到你项目里面的gradle-wrapper.properties文件里面将原来的 distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip 换乘本地的

然后运行，运行成功了！！！