datax web。datax中的web配置界面没有集成在一起开源出来，此为web端配置项目。
License: Apache License 2.0
提供一个 web 系统，方便开发人员快速创建作业
使用 spring boot 开发，直接使用 gradle 打成 war 包即可
打包成功后的相对路径为 build/libs/datax-web-0.0.1.war
系统：
CentOS Linux release 7.6.1810 (Core)
java：
java version "1.8.0_201"
Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)
tomcat：
apache-tomcat-9.0.16
需要配置下面三个环境变量：
datax安装目录：
export DATAX_HOME=...
datax源码目录：
export DATAX_SRC_HOME=...
datax作业文件保存目录：
export DATAX_JSON_HOME=...
war包放到tomcat的webapps目录后，还需要做哪些修改，能否写一个完整的文档，现在是tomcat能起来，但是web也没法访问，http://ip:8080/datax-web-0.0.1/index后，提示404错误。
页面配置完后，弹出一串json也没有提示是否完成了？
能否详细说明这三个地址分别对应的文件位置是哪里？
打包之后丢到tomcat 中, 无法运行
提示:
This application has no explicit mapping for /error, so you are seeing this as a fallback.
// datax安装目录
public static final String DATAX_HOME = System.getenv("DATAX_HOME");
// datax源码目录
public static final String DATAX_SRC_HOME = System.getenv("DATAX_SRC_HOME");
// datax作业文件保存目录
public static final String DATAX_JSON_HOME = System.getenv("DATAX_JSON_HOME");
这些 也是要配置的吧 ？
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