Java 相关

URL的getFile()方法的乱码问题

用URLDecoder.decode解码即可

URL url = getClass().getResource("temp.dat");
String beforeDecode = url.getFile();
String afterDecode = URLDecoder.decode(beforeDecode, "UTF-8");

Java运行脚本命令，并输出结果

Process pro = Runtime.getRuntime().exec("python module.py 123");
BufferedReader in = new BufferedReader(new InputStreamReader(pro.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
in.close();
pro.waitFor();

Java大小端变更

ByteBuffer buffer = ByteBuffer.allocate(40).order(ByteOrder.LITTLE_ENDIAN);
float f = dis.readFloat();
buffer.putFloat(f);
//改变大小端
buffer.order(ByteOrder.BIG_ENDIAN);
//将指针移动到流的起始位置
buffer.clear();

典型的输入输出流

字节输入流

FileInputStream fis = new FileInputStream("data2.dat");
BufferedInputStream buffer = new BufferedInputStream(fis);
dis = new DataInputStream(buffer);

字节输出流

FileOutputStream fos = new FileOutputStream("data2.dat");
BufferedOutputStream buffer = new BufferedOutputStream(fos);
dos = new DataOutputStream(buffer);

字符输入流

FileReader fr = new FileReader("data.dat");
BufferedReader reader = new BufferedReader(fr);

字符输出流

FileWriter fw = new FileWriter("data.dat");
BufferedWriter reader = new BufferedWriter(fr);

Eclipse中删除打包配置

在以下目录删除相应配置即可

Java_Workspace.metadata.plugins\org.eclipse.debug.core.launches