写这篇的起因在于，当我想用java代码实现文件的上传下载，想起curl 或者wget已经进行很好的封装，但他们都是基于C实现的命令行运行方式，暂时没有API或者好的方法可以操作，只能想到直接调用本地的CMD命令去实现。对C系列的语言没有接触过，不知道他们是否有API的概念？？或者C系列语言，Python，Java等等之间是否可以有共同的接触交流方式？？？
一、windows cmd
两种实现
1.1 Runtime.exec
@Test
public void cmd1(){
try {
Process process = Runtime.getRuntime().exec("ping wwww.baidu.com");
// Get input streams
BufferedReader stdInput = new BufferedReader(new InputStreamReader(process.getInputStream(), Charset.forName("GBK")));
BufferedReader stdError = new BufferedReader(new InputStreamReader(process.getErrorStream(),Charset.forName("GBK")));
// Read command standard output
String s;
System.out.println("Standard output: ");
while ((s = stdInput.readLine()) != null) {
System.out.println(s);
}
// Read command errors
System.out.println("Standard error: ");
while ((s = stdError.readLine()) != null) {
System.out.println(s);
}
} catch (Exception e) {
e.printStackTrace(System.err);
}
}
1.2 ProcessBuilder.start()
@Test
public void cmd3(){
ProcessBuilder processBuilder = new ProcessBuilder();
// Windows
processBuilder.command("cmd.exe", "/c", "ping wwww.baidu.com");
// processBuilder.command("cmd.exe","ping wwww.baidu.com");
try {
Process process = processBuilder.start();
BufferedReader reader =
new BufferedReader(new InputStreamReader(process.getInputStream(),Charset.forName("GBK")));
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
int exitCode = process.waitFor();
System.out.println("\nExited with error code : " + exitCode);
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
二、Linux shell
一种原理，基于Jsch实现的,两种操作方式
2.1 原生的jsch操作，我从官网找的示例
<!-- https://mvnrepository.com/artifact/com.jcraft/jsch -->
<dependency>
<groupId>com.jcraft</groupId>
<artifactId>jsch</artifactId>
<version>0.1.54</version>
</dependency>
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/**
* This program will demonstrate remote exec.
* $ CLASSPATH=.:../build javac Exec.java
* $ CLASSPATH=.:../build java Exec
* You will be asked username, hostname, displayname, passwd and command.
* If everything works fine, given command will be invoked
* on the remote side and outputs will be printed out.
*
*/
import com.jcraft.jsch.*;
import java.awt.*;
import javax.swing.*;
import java.io.*;
public class Exec{
public static void main(String[] arg){
try{
JSch jsch=new JSch();
String host=null;
if(arg.length>0){
host=arg[0];
}
else{
host=JOptionPane.showInputDialog("Enter username@hostname",
System.getProperty("user.name")+
"@localhost");
}
String user=host.substring(0, host.indexOf('@'));
host=host.substring(host.indexOf('@')+1);
Session session=jsch.getSession(user, host, 22);
/*
String xhost="127.0.0.1";
int xport=0;
String display=JOptionPane.showInputDialog("Enter display name",
xhost+":"+xport);
xhost=display.substring(0, display.indexOf(':'));
xport=Integer.parseInt(display.substring(display.indexOf(':')+1));
session.setX11Host(xhost);
session.setX11Port(xport+6000);
*/
// username and password will be given via UserInfo interface.
UserInfo ui=new MyUserInfo();
session.setUserInfo(ui);
session.connect();
String command=JOptionPane.showInputDialog("Enter command",
"set|grep SSH");
Channel channel=session.openChannel("exec");
((ChannelExec)channel).setCommand(command);
// X Forwarding
// channel.setXForwarding(true);
//channel.setInputStream(System.in);
channel.setInputStream(null);
//channel.setOutputStream(System.out);
//FileOutputStream fos=new FileOutputStream("/tmp/stderr");
//((ChannelExec)channel).setErrStream(fos);
((ChannelExec)channel).setErrStream(System.err);
InputStream in=channel.getInputStream();
channel.connect();
byte[] tmp=new byte[1024];
while(true){
while(in.available()>0){
int i=in.read(tmp, 0, 1024);
if(i<0)break;
System.out.print(new String(tmp, 0, i));
}
if(channel.isClosed()){
if(in.available()>0) continue;
System.out.println("exit-status: "+channel.getExitStatus());
break;
}
try{Thread.sleep(1000);}catch(Exception ee){}
}
channel.disconnect();
session.disconnect();
}
catch(Exception e){
System.out.println(e);
}
}
public static class MyUserInfo implements UserInfo, UIKeyboardInteractive{
public String getPassword(){ return passwd; }
public boolean promptYesNo(String str){
Object[] options={ "yes", "no" };
int foo=JOptionPane.showOptionDialog(null,
str,
"Warning",
JOptionPane.DEFAULT_OPTION,
JOptionPane.WARNING_MESSAGE,
null, options, options[0]);
return foo==0;
}
String passwd;
JTextField passwordField=(JTextField)new JPasswordField(20);
public String getPassphrase(){ return null; }
public boolean promptPassphrase(String message){ return true; }
public boolean promptPassword(String message){
Object[] ob={passwordField};
int result=
JOptionPane.showConfirmDialog(null, ob, message,
JOptionPane.OK_CANCEL_OPTION);
if(result==JOptionPane.OK_OPTION){
passwd=passwordField.getText();
return true;
}
else{
return false;
}
}
public void showMessage(String message){
JOptionPane.showMessageDialog(null, message);
}
final GridBagConstraints gbc =
new GridBagConstraints(0,0,1,1,1,1,
GridBagConstraints.NORTHWEST,
GridBagConstraints.NONE,
new Insets(0,0,0,0),0,0);
private Container panel;
public String[] promptKeyboardInteractive(String destination,
String name,
String instruction,
String[] prompt,
boolean[] echo){
panel = new JPanel();
panel.setLayout(new GridBagLayout());
gbc.weightx = 1.0;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.gridx = 0;
panel.add(new JLabel(instruction), gbc);
gbc.gridy++;
gbc.gridwidth = GridBagConstraints.RELATIVE;
JTextField[] texts=new JTextField[prompt.length];
for(int i=0; i<prompt.length; i++){
gbc.fill = GridBagConstraints.NONE;
gbc.gridx = 0;
gbc.weightx = 1;
panel.add(new JLabel(prompt[i]),gbc);
gbc.gridx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weighty = 1;
if(echo[i]){
texts[i]=new JTextField(20);
}
else{
texts[i]=new JPasswordField(20);
}
panel.add(texts[i], gbc);
gbc.gridy++;
}
if(JOptionPane.showConfirmDialog(null, panel,
destination+": "+name,
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.QUESTION_MESSAGE)
==JOptionPane.OK_OPTION){
String[] response=new String[prompt.length];
for(int i=0; i<prompt.length; i++){
response[i]=texts[i].getText();
}
return response;
}
else{
return null; // cancel
}
}
}
}
2.2 Hutool包实现的封装
这里是我之前的测试示例,这里就不演示了
三、redis shell
1种原理，多种操作方式吧，都是基于Jedis的实现，不同的封装方式，可以原生的Jedis,或者Spring Data Redis中Reids的集成操作，或者身边的不同的对Jedis的封装工具。
先空着，有时间，我在做些示例，放在这里
四、Mysql/Oracle/MongoDb
都是基于Jdbc的封装，很多框架或者封装都已经实现可以简单的使用。
先空着，有时间，我在做些示例，放在这里
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