出现场景
运行一个很老的Android或者Flutter项目时，遇到以下错误。
Launching lib/main.dart on SM G9209 in debug mode... Running Gradle task 'assembleDebug'... Exception in thread "main" javax.net.ssl.SSLException: Connection reset at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:127) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:349) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:292) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:287) at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:144) at java.base/sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1418) at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1324) at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:440) at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:411) at java.base/sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:567) at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:197) at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1592) at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1520) at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:250) 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) Suppressed: java.net.SocketException: Broken pipe (Write failed) at java.base/java.net.SocketOutputStream.socketWrite0(Native Method) at java.base/java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:110) at java.base/java.net.SocketOutputStream.write(SocketOutputStream.java:150) at java.base/sun.security.ssl.SSLSocketOutputRecord.encodeAlert(SSLSocketOutputRecord.java:81) at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:380) ... 20 more Caused by: java.net.SocketException: Connection reset at java.base/java.net.SocketInputStream.read(SocketInputStream.java:186) at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140) at java.base/sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:478) at java.base/sun.security.ssl.SSLSocketInputRecord.readHeader(SSLSocketInputRecord.java:472) at java.base/sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:160) at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:110) ... 17 more [!] Gradle threw an error while downloading artifacts from the network.
我们只需要关注最后一句话：
Gradle threw an error while downloading artifacts from the network.
根据提示，是因为Android项目在构建阶段会去Gradle官网下载gradle/wrapper目录中指定的Gradle版本。
解决方案
有两种方法。
替换Gradle地址(推荐)
打开Android项目目录中的gradle/wrapper/gradle-wrapper.properties.
修改distributionUrl后的地址为国内Gradle镜像地址。
腾讯云Gradle镜像：https://mirrors.cloud.tencent.com/gradle/ 加上版本号。
#Fri Jun 23 08:50:38 CEST 2017 distributionBase=GRADLE_USER_HOME distributionPath=wrapper/dists zipStoreBase=GRADLE_USER_HOME zipStorePath=wrapper/dists #distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-all.zip distributionUrl=https://mirrors.cloud.tencent.com/gradle/gradle-7.2-all.zip
手动下载
先去Gradle官网下载对应版本Gradle(下载地址)。
找到对应的版本后下载到本地。放在.gradle/wrapper/dists/，然后解压。
重新编译项目完成。
