JAVA学习笔记

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JAVA 文件读取
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String a="";
BufferedReader reader=new BufferedReader(new InputStreamReader(new FileInputStream("E:\\1.txt")));
String line=null;
for(;(line=reader.readLine())!=null;){
a+=line;
}reader.close();

BufferedReader reader=new BufferedReader(new InputStreamReader(new FileInputStream("E://a/2.txt")));
String a=null;
a=reader.readLine();

windows PATH： E://a/2.tx 或 E:\\a/2.tx
linux PATH：

JAVA调用命令，并输出执行结果
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Runtime rt = Runtime.getRuntime();
Process p = rt.exec("cmd.exe /c ipconfig /all");
BufferedReader br = null;
br = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
StringBuilder sb = new StringBuilder();
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
System.out.println(sb.toString());

完整类：
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Command {
    public static void exeCmd(String commandStr) {
        BufferedReader br = null;
        try {
            Process p = Runtime.getRuntime().exec(commandStr);
            br = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String line = null;
            StringBuilder sb = new StringBuilder();
            while ((line = br.readLine()) != null) {
                sb.append(line + "\n");
            }
            System.out.println(sb.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally
        {
            if (br != null)
            {
                try {
                    br.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }

程序当前路径
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File file1 = new File(".");
String curdir = file1.getAbsolutePath();

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