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install jdk
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README_cn.md

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@@ -119,8 +119,25 @@ You only need a JDK and a python interpreter to run the Gudu SQLFlow lite versio
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### step 1 环境准备
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* 安装python3
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* 安装 java jdk1.8
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* 安装 java jdk, 要求jdk1.8及以上版本
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检查jdk版本:`java -version`
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如果未安装或版本小于1.8,则需要安装jdk1.8:
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`sudo apt install openjdk-8-jdk`
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如果报错:
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`Unable to locate package openjdk-8-jdk`
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则执行以下命令安装:
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```
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sudo add-apt-repository ppa:openjdk-r/ppa
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apt-get update
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sudo apt install openjdk-8-jdk
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```
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### step 2 打开web服务
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切换到本项目widget目录,执行以下命令启动web服务:
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