添加海康工业相机demo代码

wms-webapi/Library/JavaEnv.bat

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+:: 检查java安装环境
+
+@echo off
+
+:: 设置全局错误码
+set /A errorcode=0
+
+:: 开启扩展功能
+setlocal ENABLEEXTENSIONS
+setlocal ENABLEDELAYEDEXPANSION
+
+::通过向临时文件写内容，判断是否有文件读写权限
+echo > tmp
+if exist tmp (
+    del /F/Q tmp >nul 2>&1
+) else (
+    echo Please switch to an administrator account to run this batch!!!
+    set /A errorcode=1
+    goto:END
+)
+
+::判断JAVA_HOME是否被定义
+if "%JAVA_HOME%"=="" (
+    echo JAVA_HOME not set. Please make sure that java is correctly installed.
+    set /A errorcode=2
+    goto:END
+)
+
+:: 判断CLASSPATH是否被定义
+if "%CLASSPATH%"=="" (
+    echo CLASSPATH not set. Please make sure that java is correctly installed.
+    set /A errorcode=3
+    goto:END
+)
+
+:: 判断java版本是否比 1.7.0高，需先将版本信息重定向到文件中，再对文件内容进行分析
+java -version >nul 2> JavaVer.tmp
+for /F "tokens=1,2,3*" %%i in (JavaVer.tmp) do (
+    if "%%j" == "version" (
+        if %%k LSS "1.7.0" (
+            echo Java version is less than "1.7.0", warnings or errors may occur.
+        )
+    )
+)
+del /F/Q JavaVer.tmp >nul 2>&1
+
+:END
+
+::返回错误码
+exit /B %errorcode%