Windows批处理BAT脚本获取32位系统支持的Java参数Xmx的最大值

操作系统版本：

E:\>systeminfo | findstr /c:"OS Name"
OS Name:                   Microsoft(R) Windows(R) Server 2003, Enterprise Edition

Java 版本：

E:\>java -version
java version "1.7.0_67"
Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
Java HotSpot(TM) Client VM (build 24.65-b04, mixed mode, sharing)

测试结果：

E:\>test.bat
Testing: -Xmx1000m OK
Testing: -Xmx1100m OK
Testing: -Xmx1200m OK
Testing: -Xmx1300m OK
Testing: -Xmx1400m OK
Testing: -Xmx1400m OK
Testing: -Xmx1410m OK
Testing: -Xmx1420m OK
Testing: -Xmx1430m OK
Testing: -Xmx1440m OK
Testing: -Xmx1440m OK
Final value is: -Xmx1440m
Press any key to continue . . .

代码：

@echo off
REM ============================================================================
REM Function: Fetch the max value of java option -Xmx in 32 bit Windows system
REM Version: 1.0 @ Sep 10 2014
REM ============================================================================

java -version >nul 2>&1
if errorlevel 1 (
    echo Please make sure you have:
    echo 1. Installed JDK or JRE
    echo 2. Created environment variable %%JAVA_HOME%%
    echo 3. Added environment variable %%JAVA_HOME%%\bin into %%PATH%%
    goto End
)

:StepHundred
for /l %%i in (1000,100,2048) do (
    java -Xmx%%im -version >nul 2>&1
    if errorlevel 1 (
        goto StepTen
    ) else (
        set "Xmx=%%i"
        echo Testing: -Xmx%%im OK
    )
)

:StepTen
for /l %%i in (%Xmx%,10,2048) do (
    java -Xmx%%im -version >nul 2>&1
    if errorlevel 1 (
        goto StepOne
    ) else (
        set "Xmx=%%i"
        echo Testing: -Xmx%%im OK
    )
)

:StepOne
for /l %%i in (%Xmx%,1,2048) do (
    java -Xmx%%im -version >nul 2>&1
    if errorlevel 1 (
        goto ShowResult
    ) else (
        set "Xmx=%%i"
        echo Testing: -Xmx%%im OK
    )
)

:ShowResult
echo Final value is: -Xmx%Xmx%m

:End
pause