Question

我正在用Java为mongodb服务器编写一个应用程序，我需要：

1-启动我的Mongo DB服务器（在终端中是：“ mongod”）

2-访问Mongo并删除一个集合（在终端中执行：“ mongo”，“ use my_db”和“ db.user_coll.drop（）”）

3-导入新集合（在终端中：“ mongoimport --db my_db--集合user_coll-文件user_coll”

我可以在终端中进行所有操作，但是当我尝试使用ProcessBuilder或getRunTime.exec（）从Java运行时，不起作用：（

这是我的代码：

String DBPath ="";

if(args.length<=3) {
 System.out.println("Localizando collection em " + System.getProperty("user.home") + "/Desktop/");
 DBPath = System.getProperty("user.home") + "/Desktop/";
}
else { 
 String LastChar = 
 Character.toString(args[3].charAt(args[3].length()-1));
 if (LastChar == "/") {
  System.out.println("Localizando collection em " + args[3]);
  DBPath = args[3];
 }
 else{
  System.out.println("Localizando collection em " + args[3] + "/");
  DBPath = args[3]+ "/";
 }
}

File f = new File(DBPath + "user_coll");
if(f.isFile()) {
 System.out.println("Collection localizada, iniciando servidor MongoDB e derrubando a collection atual...");
 ProcessBuilder proc = new ProcessBuilder(new String[] {"/bin/bash", "-c", "mongod"});
 proc.start().waitFor();
 String echo = "cd "+ System.getProperty("user.dir")+ " && mongo < mongodbscript.js";
 Process proc2 = new ProcessBuilder(new String[] {"bash","-c", echo}).start();
 System.out.println("Importando nova collection...");
 Process proc3 = new ProcessBuilder(new String[] {"bash", "-c", "cd " + DBPath + " && mongoimport --db my_db --collection user_coll --file user_coll"}).start();
 System.out.println("Collection importada...");
}
else {
 System.out.println("Nova collection não localizada, iniciando servidor MongoDB com a collection existente");
 Process proc = new ProcessBuilder(new String[] {"bash", "-c", "mongod"}).start();
}

Answer 1

我一直在MacOS中处理此问题，并且找到了解决方法。

我将mongoimport命令的完整路径添加到exec命令：

Runtime r  = Runtime.getRuntime();

Process p = r.exec(path + command);

其中path =“ / Users /'myname'/ Documents / mongoInstallation / bin” 和comand =“ mongoimport”

ProcessBuilder和RunTime.exec未在代码中运行我

1 个答案: