『Java安全』Runtime执行cmd、shell命令并输出返回值 |
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文章目录
前言直调执行cmd、shell命令无需回显需要回显、输出返回值
反射执行命令以String传入指令以String[]传入指令
完
前言
由于系统对命令的空格分隔符会截断错误,因此对长指令如ls -al /最好不要用String传入,而是使用String[] cmd = {"ls", "-al", "/"}用字符串数组的形式传入 直调执行cmd、shell命令 无需回显不要回显只是运行直接exec即可 String[] cmd = {"calc"}; Runtime.getRuntime.exec(cmd);回显返回值需要获取InputStream,然后reader读取输入流可以指定编码(例如Windows下cmd默认是GBK,不设置编码可能有乱码出现),之后再按行读取缓冲区显示即可 public static void main(String[] args) throws Exception { String[] cmd = {"ls", "-al", "."}; InputStream is = Runtime.getRuntime().exec(cmd).getInputStream(); InputStreamReader isr = new InputStreamReader(is, "UTF-8"); BufferedReader br = new BufferedReader(isr); String line = br.readLine(); while (line != null){ System.out.println(line); line = br.readLine(); } }这里对传入的指令类型String和String[]的处理不同,不需要回显只到invoke即可 以String传入指令反射获取构造器和类方法exec,然后invoke,输出 package Test; import java.io.InputStream; import java.io.BufferedReader; import java.io.InputStreamReader; import java.lang.reflect.Constructor; import java.lang.reflect.Method; public class ReflectRuntime { public static void main(String[] args) throws Exception { String cmd = "whoami"; Class cls = Class.forName("java.lang.Runtime"); Constructor constructor = cls.getDeclaredConstructor(); constructor.setAccessible(true); Object obj = constructor.newInstance(); Method method = cls.getDeclaredMethod("exec", String.class); Process p = (Process) method.invoke(obj, cmd); InputStream is = p.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line = br.readLine(); while (line != null){ System.out.println(line); line = br.readLine(); } } } 以String[]传入指令注意method.invoke(obj, (Object) cmd);,需要将cmd向上转型为Object才能传入 package Test; import java.io.InputStream; import java.io.BufferedReader; import java.io.InputStreamReader; import java.lang.reflect.Constructor; import java.lang.reflect.Method; public class ReflectRuntime { public static void main(String[] args) throws Exception { String[] cmd = {"ls", "-al", "."}; Class cls = Class.forName("java.lang.Runtime"); Constructor constructor = cls.getDeclaredConstructor(); constructor.setAccessible(true); Object obj = constructor.newInstance(); Method method = cls.getDeclaredMethod("exec", String[].class); Process p = (Process) method.invoke(obj, (Object) cmd); InputStream is = p.getInputStream(); InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line = br.readLine(); while (line != null){ System.out.println(line); line = br.readLine(); } } }欢迎在评论区留言,欢迎关注我的CSDN @Ho1aAs |
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