Process Builder Issue

Question

我正在研究一个java程序，因为它使用单独的JRE，所以我必须使用进程生成器调用另一个java程序。

下面是批处理程序调用该程序，并正常工作：

cd C:\apps\Project_name\bin\ 
C:\Progra~1\Java\jre1.6.0_03\bin\java -Xms512m -Xmx1024m 
    -cp ../lib/spring-1.2.2.jar;../lib/log4j-1.2.8.jar;../lib/commons-logging-1.0.4.jar;../lib/wrapper.jar 
    com.project.main.MainProgramLauncher arg1 arg2 

现在，我宣布我的代码是这样的：

ProcessBuilder builder = new ProcessBuilder(
    "java", 
    "-Xms512m", 
    "-Xmx1024m", 
    "-cp ../lib/spring-1.2.2.jar;../lib/log4j-1.2.8.jar;"+ 
    "../lib/commons-logging-1.0.4.jar;../lib/wrapper.jar", 
    "com.project.main.MainProgramLauncher arg1 arg2 ...argN" 
); 
Map<String, String> environment = builder.environment(); 

environment.put("path", ";"); // Clearing the path variable; 
environment.put("path", java_bin_location+";"); 
Process javap = builder.start(); 
InputStreamReader tempReader = new InputStreamReader(
    new BufferedInputStream(javap.getInputStream()) 
); 
BufferedReader reader = new BufferedReader(tempReader); 
while (true) { 
    String line = reader.readLine(); 
    if (line == null) 
     break; 
    System.out.println(line); 
} 

但它不执行的事情应该是这样。程序马上崩溃。有什么不同，我应该做的？请建议。

Answer 1

我猜你应该让你的类名和参数不同的字符串。而不是：

"java", 
"-Xms512m", 
"-Xmx1024m", 
"-cp ../lib/spring-1.2.2.jar;../lib/log4j-1.2.8.jar;"+ 
"../lib/commons-logging-1.0.4.jar;../lib/wrapper.jar", 
"com.project.main.MainProgramLauncher arg1 arg2 ...argN" 

应该

"java", 
"-Xms512m", 
"-Xmx1024m", 
"-cp", 
"../lib/spring-1.2.2.jar;../lib/log4j-1.2.8.jar;"+ 
"../lib/commons-logging-1.0.4.jar;../lib/wrapper.jar", 
"com.project.main.MainProgramLauncher", 
"arg1", 
"arg2", 
... 
"argN" 

您所使用的全路径名来调用java.exe，但不是当你使用ProcessBuilder其他引人注目的事情。

您可能还想要读取错误流（或致电redirectErrorStream(true) - 参数非常重要（！））。