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

Shell_HAT

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：

1. @echo off
   
2. REM ============================================================================
   
3. REM Function: Fetch the max value of java option -Xmx in 32 bit Windows system
   
4. REM Version: 1.0 @ Sep 10 2014
   
5. REM ============================================================================
   
6. 
   
7. java -version >nul 2>&1
   
8. if errorlevel 1 (
   
9.     echo Please make sure you have:
   
10.     echo 1. Installed JDK or JRE
    
11.     echo 2. Created environment variable %%JAVA_HOME%%
    
12.     echo 3. Added environment variable %%JAVA_HOME%%\bin into %%PATH%%
    
13.     goto End
    
14. )
    
15. 
    
16. :StepHundred
    
17. for /l %%i in (1000,100,2048) do (
    
18.     java -Xmx%%im -version >nul 2>&1
    
19.     if errorlevel 1 (
    
20.         goto StepTen
    
21.     ) else (
    
22.         set "Xmx=%%i"
    
23.         echo Testing: -Xmx%%im OK
    
24.     )
    
25. )
    
26. 
    
27. :StepTen
    
28. for /l %%i in (%Xmx%,10,2048) do (
    
29.     java -Xmx%%im -version >nul 2>&1
    
30.     if errorlevel 1 (
    
31.         goto StepOne
    
32.     ) else (
    
33.         set "Xmx=%%i"
    
34.         echo Testing: -Xmx%%im OK
    
35.     )
    
36. )
    
37. 
    
38. :StepOne
    
39. for /l %%i in (%Xmx%,1,2048) do (
    
40.     java -Xmx%%im -version >nul 2>&1
    
41.     if errorlevel 1 (
    
42.         goto ShowResult
    
43.     ) else (
    
44.         set "Xmx=%%i"
    
45.         echo Testing: -Xmx%%im OK
    
46.     )
    
47. )
    
48. 
    
49. :ShowResult
    
50. echo Final value is: -Xmx%Xmx%m
    
51. 
    
52. :End
    
53. pause

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