可执行文件查找32位Java时应查找64位
我正在从PowerShell脚本编写一个可执行文件,该脚本需要将正确版本的Java3D放到客户端计算机上。所谓正确的版本,我的意思是当用户打开CMD并键入“java-version”时,它给出32或64位。我需要为正确的体系结构选择dll文件 问题是,我发现了一个安装了32位和64位JDK的64位W7系统的测试用例。PATH环境变量中仅包含64位版本。然而,当我运行批处理脚本或可执行文件并返回java版本时,就会出现32位java。因此,它安装32位DLL,当用户转到cmd时,它使用64位,因此不兼容可执行文件查找32位Java时应查找64位,java,windows-7,cmd,java-3d,Java,Windows 7,Cmd,Java 3d,我正在从PowerShell脚本编写一个可执行文件,该脚本需要将正确版本的Java3D放到客户端计算机上。所谓正确的版本,我的意思是当用户打开CMD并键入“java-version”时,它给出32或64位。我需要为正确的体系结构选择dll文件 问题是,我发现了一个安装了32位和64位JDK的64位W7系统的测试用例。PATH环境变量中仅包含64位版本。然而,当我运行批处理脚本或可执行文件并返回java版本时,就会出现32位java。因此,它安装32位DLL,当用户转到cmd时,它使用64位,因此
既然32位JDK不包含在PATH变量中,为什么脚本运行32位java以及从何处获取此链接?Google Chrome和Firefox仍然是64位Windows操作系统下的32位应用程序,因此,您可能正在执行由他们在SysWOW64下安装的32位java—特别是如果您使用在这些浏览器中运行的java Web Start安装应用程序 我遇到了完全相同的问题,我已经实现了对已安装java的系统范围搜索,这样我就可以创建一个批处理文件,用适当的位调用完全相同的java.exe 这就是您需要的:
/**
* Java Finder by petrucio@stackoverflow(828681) is licensed under a Creative Commons Attribution 3.0 Unported License.
* Needs WinRegistry.java. Get it at: https://stackoverflow.com/questions/62289/read-write-to-windows-registry-using-java
*
* JavaFinder - Windows-specific classes to search for all installed versions of java on this system
* Author: petrucio@stackoverflow (828681)
*****************************************************************************/
import java.util.*;
import java.io.*;
/**
* Helper class to fetch the stdout and stderr outputs from started Runtime execs
* Modified from http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?page=4
*****************************************************************************/
class RuntimeStreamer extends Thread {
InputStream is;
String lines;
RuntimeStreamer(InputStream is) {
this.is = is;
this.lines = "";
}
public String contents() {
return this.lines;
}
public void run() {
try {
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line = null;
while ( (line = br.readLine()) != null) {
this.lines += line + "\n";
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
/**
* Execute a command and wait for it to finish
* @return The resulting stdout and stderr outputs concatenated
****************************************************************************/
public static String execute(String[] cmdArray) {
try {
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(cmdArray);
RuntimeStreamer outputStreamer = new RuntimeStreamer(proc.getInputStream());
RuntimeStreamer errorStreamer = new RuntimeStreamer(proc.getErrorStream());
outputStreamer.start();
errorStreamer.start();
proc.waitFor();
return outputStreamer.contents() + errorStreamer.contents();
} catch (Throwable t) {
t.printStackTrace();
}
return null;
}
public static String execute(String cmd) {
String[] cmdArray = { cmd };
return RuntimeStreamer.execute(cmdArray);
}
}
/**
* Helper struct to hold information about one installed java version
****************************************************************************/
class JavaInfo {
public String path; //! Full path to java.exe executable file
public String version; //! Version string. "Unkown" if the java process returned non-standard version string
public boolean is64bits; //! true for 64-bit javas, false for 32
/**
* Calls 'javaPath -version' and parses the results
* @param javaPath: path to a java.exe executable
****************************************************************************/
public JavaInfo(String javaPath) {
String versionInfo = RuntimeStreamer.execute( new String[] { javaPath, "-version" } );
String[] tokens = versionInfo.split("\"");
if (tokens.length < 2) this.version = "Unkown";
else this.version = tokens[1];
this.is64bits = versionInfo.toUpperCase().contains("64-BIT");
this.path = javaPath;
}
/**
* @return Human-readable contents of this JavaInfo instance
****************************************************************************/
public String toString() {
return this.path + ":\n Version: " + this.version + "\n Bitness: " + (this.is64bits ? "64-bits" : "32-bits");
}
}
/**
* Windows-specific java versions finder
*****************************************************************************/
public class JavaFinder {
/**
* @return: A list of javaExec paths found under this registry key (rooted at HKEY_LOCAL_MACHINE)
* @param wow64 0 for standard registry access (32-bits for 32-bit app, 64-bits for 64-bits app)
* or WinRegistry.KEY_WOW64_32KEY to force access to 32-bit registry view,
* or WinRegistry.KEY_WOW64_64KEY to force access to 64-bit registry view
* @param previous: Insert all entries from this list at the beggining of the results
*************************************************************************/
private static List<String> searchRegistry(String key, int wow64, List<String> previous) {
List<String> result = previous;
try {
List<String> entries = WinRegistry.readStringSubKeys(WinRegistry.HKEY_LOCAL_MACHINE, key, wow64);
for (int i = 0; entries != null && i < entries.size(); i++) {
String val = WinRegistry.readString(WinRegistry.HKEY_LOCAL_MACHINE, key + "\\" + entries.get(i), "JavaHome", wow64);
if (!result.contains(val + "\\bin\\java.exe")) {
result.add(val + "\\bin\\java.exe");
}
}
} catch (Throwable t) {
t.printStackTrace();
}
return result;
}
/**
* @return: A list of JavaInfo with informations about all javas installed on this machine
* Searches and returns results in this order:
* HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment (32-bits view)
* HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment (64-bits view)
* HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit (32-bits view)
* HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit (64-bits view)
* WINDIR\system32
* WINDIR\SysWOW64
****************************************************************************/
public static List<JavaInfo> findJavas() {
List<String> javaExecs = new ArrayList<String>();
javaExecs = JavaFinder.searchRegistry("SOFTWARE\\JavaSoft\\Java Runtime Environment", WinRegistry.KEY_WOW64_32KEY, javaExecs);
javaExecs = JavaFinder.searchRegistry("SOFTWARE\\JavaSoft\\Java Runtime Environment", WinRegistry.KEY_WOW64_64KEY, javaExecs);
javaExecs = JavaFinder.searchRegistry("SOFTWARE\\JavaSoft\\Java Development Kit", WinRegistry.KEY_WOW64_32KEY, javaExecs);
javaExecs = JavaFinder.searchRegistry("SOFTWARE\\JavaSoft\\Java Development Kit", WinRegistry.KEY_WOW64_64KEY, javaExecs);
javaExecs.add(System.getenv("WINDIR") + "\\system32\\java.exe");
javaExecs.add(System.getenv("WINDIR") + "\\SysWOW64\\java.exe");
List<JavaInfo> result = new ArrayList<JavaInfo>();
for (String javaPath: javaExecs) {
if (!(new File(javaPath).exists())) continue;
result.add(new JavaInfo(javaPath));
}
return result;
}
/**
* @return: The path to a java.exe that has the same bitness as the OS
* (or null if no matching java is found)
****************************************************************************/
public static String getOSBitnessJava() {
String arch = System.getenv("PROCESSOR_ARCHITECTURE");
String wow64Arch = System.getenv("PROCESSOR_ARCHITEW6432");
boolean isOS64 = arch.endsWith("64") || (wow64Arch != null && wow64Arch.endsWith("64"));
List<JavaInfo> javas = JavaFinder.findJavas();
for (int i = 0; i < javas.size(); i++) {
if (javas.get(i).is64bits == isOS64) return javas.get(i).path;
}
return null;
}
/**
* Standalone testing - lists all Javas in the system
****************************************************************************/
public static void main(String [] args) {
List<JavaInfo> javas = JavaFinder.findJavas();
for (int i = 0; i < javas.size(); i++) {
System.out.println("\n" + javas.get(i));
}
}
}
请注意,SysWOW64下有一个32位的java.exe,它在Chrome或Firefox中运行时会被web初学者调用,因为它们是32位应用程序,除非您使用JavaFinder找到一个正确咬合的java.exe并使用它的完整路径。您确定另一个java不在您的路径中吗?在Windows中有两个位置可以设置路径,一个在系统环境变量中,一个在用户特定的环境变量中,如图所示。您能发布echo%PATH%的结果吗?请检查windows和windows\system32目录中的java.exe。我遇到过许多程序,它们将java.exe捆绑到其中一个目录中。我确信32位既不在用户变量中,也不在系统环境变量中@高度情感化,这听起来似乎符合症状-我会调查的。路径:C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\TortoiseSVN\bin;C:\ProgramFiles(x86)\QuickTime\QTSystem\;C:\Program Files\Common Files\Microsoft Shared\Windows Live C:\Program Files(x86)\GNU\GnuPG C:\Program Files\Java SDK\jdk\B谢谢。也许我需要的太多了,但绝对有用。
>java JavaFinder
C:\Program Files (x86)\Java\jre6\bin\java.exe:
Version: 1.6.0_31
Bitness: 32-bits
C:\Program Files\Java\jre6\bin\java.exe:
Version: 1.6.0_31
Bitness: 64-bits
D:\Dev\Java\jdk1.6.0_31\bin\java.exe:
Version: 1.6.0_31
Bitness: 64-bits
C:\Windows\system32\java.exe:
Version: 1.6.0_31
Bitness: 64-bits
C:\Windows\SysWOW64\java.exe:
Version: 1.6.0_31
Bitness: 32-bits