用Java写脚本，常用的一些方法

平时用的一些小方法，总结之

1.运行一个可执行程序

比如，你如果想运行如下命令

C://test//aapt.exe -f params1 -M params2

try {        ProcessBuilder pb = new ProcessBuilder("C://test//aapt.exe","-f","params1","-M","params2");        pb.redirectErrorStream(true);        Process process = pb.start();        InputStream inputStream = process.getInputStream();        BufferedReader bufferedReader = new BufferedReader(                new InputStreamReader(inputStream));        String line = "";        while ((line = bufferedReader.readLine()) != null) {            System.out.println(INFO + line);        }        int exit = process.waitFor();        if (exit == 0) {            System.out.println("finished...");        } else {            System.out.println("error...");        }    } catch (Exception e) {        e.printStackTrace();        System.exit(-1);    }

注意：
1.调用ProcessBuilder的start()方法，开始执行命令。
2.通过process.getInputStream，把执行命令过程中的日志打印出来。
3.通过调用process.waitFor()，阻塞当前线程，直到命令执行完毕后，获得返回码

2.获取当前Class在运行时的路径(亦适用于jar)

比如，获取TestMain这个类在运行时的路径。

URL location = TestMain.class.getProtectionDomain().getCodeSource()            .getLocation();String path = location.getFile();

3.获取系统的环境变量

比如，获取系统的JAVA_HOME这个环境变量的值

String path = System.getenv("JAVA_HOME");

4.删除目录

public static boolean deleteDirectory(File directory) {    if (directory.exists()) {        File[] files = directory.listFiles();        if (null != files) {            for (int i = 0; i < files.length; i++) {                if (files[i].isDirectory()) {                    deleteDirectory(files[i]);                } else {                    files[i].delete();                }            }        }    }    return (directory.delete());}

5.读写文件

/** * 写文件 * * @param filePath * @param sets * @throws IOException */public synchronized void writeFile(String filePath, String content)        throws IOException {    FileWriter fw = new FileWriter(filePath);    PrintWriter out = new PrintWriter(fw);    out.write(content);    out.println();    fw.close();    out.close();}/** * 读文件 * * @param filename * @return */public static String readFile(String filepath) {    File file = new File(filepath);    InputStream inputStream = null;    BufferedReader bufferedReader = null;    try {        inputStream = new FileInputStream(file);        String content = "";        if (inputStream != null) {            bufferedReader = new BufferedReader(new InputStreamReader(                    inputStream));            String line = "";            while ((line = bufferedReader.readLine()) != null) {                content += line;            }        }        return content;    } catch (Exception e) {        System.out.println(e.toString());    } finally {        try {            if (bufferedReader != null) {                bufferedReader.close();                bufferedReader = null;            }            if (inputStream != null) {                inputStream.close();                inputStream = null;            }        } catch (Exception e) {            System.out.println(e.toString());        }    }    return null;}public static byte[] readByte(final InputStream in) throws IOException {    ByteArrayOutputStream output = null;    try {        if (in == null) {            return null;        }        output = new ByteArrayOutputStream(1024 * 2);        byte[] buffer = new byte[1024];        int len;        while ((len = in.read(buffer)) != -1) {            output.write(buffer, 0, len);        }        return output.toByteArray();    } finally {        if (output != null) {            try {                output.close();            } catch (IOException e) {                e.printStackTrace();            }        }        if (in != null) {            try {                in.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }}public static boolean saveObject(Serializable serializable,        String filePath) {    try {        FileOutputStream fout = new FileOutputStream(filePath);        ObjectOutputStream oos = new ObjectOutputStream(fout);        oos.writeObject(serializable);        oos.close();        return true;    } catch (Exception e) {        e.printStackTrace();    }    return false;}

6.TODO