Java 连接远程Linux 服务器执行 shell 脚本查看 CPU、内存、硬盘信息

pom.xml jar 包支持

　　　　<dependency>
<groupId>com.jcraft</groupId>
<artifactId>jsch</artifactId>
<version>0.1.53</version>
</dependency>

package com.spring.bean.annotation;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;

/**
* 远程调用Linux shell 命令
*
* @author wei.Li by 14-9-2.
*/
public class LinuxStateForShell {

public static final String CPU_MEM_SHELL = "top -b -n 1";
public static final String FILES_SHELL = "df -hl";
public static final String[] COMMANDS = {CPU_MEM_SHELL, FILES_SHELL};
public static final String LINE_SEPARATOR = System.getProperty("line.separator");
private static Session session;

/**
* 连接到指定的HOST
*
* @return isConnect
* @throws JSchException JSchException
*/
private static boolean connect(String user, String passwd, String host) {
JSch jsch = new JSch();
try {
session = jsch.getSession(user, host, 22);
session.setPassword(passwd);

java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);

session.connect();
} catch (JSchException e) {
e.printStackTrace();
System.out.println("connect error !");
return false;
}
return true;
}

/**
* 远程连接Linux 服务器 执行相关的命令
*
* @param commands 执行的脚本
* @param user     远程连接的用户名
* @param passwd   远程连接的密码
* @param host     远程连接的主机IP
* @return 最终命令返回信息
*/
public static Map<String, String> runDistanceShell(String[] commands, String user, String passwd, String host) {
if (!connect(user, passwd, host)) {
return null;
}
Map<String, String> map = new HashMap<>();
StringBuilder stringBuffer;

BufferedReader reader = null;
Channel channel = null;
try {
for (String command : commands) {
stringBuffer = new StringBuilder();
channel = session.openChannel("exec");
((ChannelExec) channel).setCommand(command);

channel.setInputStream(null);
((ChannelExec) channel).setErrStream(System.err);

channel.connect();
InputStream in = channel.getInputStream();
reader = new BufferedReader(new InputStreamReader(in));
String buf;
while ((buf = reader.readLine()) != null) {

//舍弃PID 进程信息
if (buf.contains("PID")) {
break;
}
stringBuffer.append(buf.trim()).append(LINE_SEPARATOR);
}
//每个命令存储自己返回数据-用于后续对返回数据进行处理
map.put(command, stringBuffer.toString());
}
} catch (IOException | JSchException e) {
e.printStackTrace();
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
if (channel != null) {
channel.disconnect();
}
session.disconnect();
}
return map;
}

/**
* 直接在本地执行 shell
*
* @param commands 执行的脚本
* @return 执行结果信息
*/
public static Map<String, String> runLocalShell(String[] commands) {
Runtime runtime = Runtime.getRuntime();

Map<String, String> map = new HashMap<>();
StringBuilder stringBuffer;

BufferedReader reader;
Process process;
for (String command : commands) {
stringBuffer = new StringBuilder();
try {
process = runtime.exec(command);
InputStream inputStream = process.getInputStream();
reader = new BufferedReader(new InputStreamReader(inputStream));
String buf;
while ((buf = reader.readLine()) != null) {
//舍弃PID 进程信息
if (buf.contains("PID")) {
break;
}
stringBuffer.append(buf.trim()).append(LINE_SEPARATOR);
}

} catch (IOException e) {
e.printStackTrace();
return null;
}
//每个命令存储自己返回数据-用于后续对返回数据进行处理
map.put(command, stringBuffer.toString());
}
return map;
}

/**
* 处理 shell 返回的信息
* <p>
* 具体处理过程以服务器返回数据格式为准
* 不同的Linux 版本返回信息格式不同
*
* @param result shell 返回的信息
* @return 最终处理后的信息
*/
private static String disposeResultMessage(Map<String, String> result) {

StringBuilder buffer = new StringBuilder();

for (String command : COMMANDS) {
String commandResult = result.get(command);
if (null == commandResult) continue;

if (command.equals(CPU_MEM_SHELL)) {
String[] strings = commandResult.split(LINE_SEPARATOR);
//将返回结果按换行符分割
for (String line : strings) {
line = line.toUpperCase();//转大写处理

//处理CPU Cpu(s): 10.8%us,  0.9%sy,  0.0%ni, 87.6%id,  0.7%wa,  0.0%hi,  0.0%si,  0.0%st
if (line.startsWith("CPU(S):")) {
String cpuStr = "CPU 用户使用占有率:";
try {
cpuStr += line.split(":")[1].split(",")[0].replace("US", "");
} catch (Exception e) {
e.printStackTrace();
cpuStr += "计算过程出错";
}
buffer.append(cpuStr).append(LINE_SEPARATOR);

//处理内存 Mem:  66100704k total, 65323404k used,   777300k free,    89940k buffers
} else if (line.startsWith("MEM")) {
String memStr = "内存使用情况:";
try {
memStr += line.split(":")[1]
.replace("TOTAL", "总计")
.replace("USED", "已使用")
.replace("FREE", "空闲")
.replace("BUFFERS", "缓存");

} catch (Exception e) {
e.printStackTrace();
memStr += "计算过程出错";
buffer.append(memStr).append(LINE_SEPARATOR);
continue;
}
buffer.append(memStr).append(LINE_SEPARATOR);

}
}
} else if (command.equals(FILES_SHELL)) {
//处理系统磁盘状态
buffer.append("系统磁盘状态:");
try {
buffer.append(disposeFilesSystem(commandResult)).append(LINE_SEPARATOR);
} catch (Exception e) {
e.printStackTrace();
buffer.append("计算过程出错").append(LINE_SEPARATOR);
}
}
}

return buffer.toString();
}

//处理系统磁盘状态

/**
* Filesystem            Size  Used Avail Use% Mounted on
* /dev/sda3             442G  327G   93G  78% /
* tmpfs                  32G     0   32G   0% /dev/shm
* /dev/sda1             788M   60M  689M   8% /boot
* /dev/md0              1.9T  483G  1.4T  26% /ezsonar
*
* @param commandResult 处理系统磁盘状态shell执行结果
* @return 处理后的结果
*/
private static String disposeFilesSystem(String commandResult) {
String[] strings = commandResult.split(LINE_SEPARATOR);

// final String PATTERN_TEMPLATE = "([a-zA-Z0-9%_/]*)\\s";
int size = 0;
int used = 0;
for (int i = 0; i < strings.length - 1; i++) {
if (i == 0) continue;

int temp = 0;
for (String s : strings[i].split("\\b")) {
if (temp == 0) {
temp++;
continue;
}
if (!s.trim().isEmpty()) {
if (temp == 1) {
size += disposeUnit(s);
temp++;
} else {
used += disposeUnit(s);
temp = 0;
}
}
}
}
return new StringBuilder().append("大小 ").append(size).append("G , 已使用").append(used).append("G ,空闲")
.append(size - used).append("G").toString();
}

/**
* 处理单位转换
* K/KB/M/T 最终转换为G 处理
*
* @param s 带单位的数据字符串
* @return 以G 为单位处理后的数值
*/
private static int disposeUnit(String s) {

try {
s = s.toUpperCase();
String lastIndex = s.substring(s.length() - 1);
String num = s.substring(0, s.length() - 1);
int parseInt = Integer.parseInt(num);
if (lastIndex.equals("G")) {
return parseInt;
} else if (lastIndex.equals("T")) {
return parseInt * 1024;
} else if (lastIndex.equals("M")) {
return parseInt / 1024;
} else if (lastIndex.equals("K") || lastIndex.equals("KB")) {
return parseInt / (1024 * 1024);
}
} catch (NumberFormatException e) {
e.printStackTrace();
return 0;
}
return 0;
}

public static void main(String[] args) {
Map<String, String> result = runDistanceShell(COMMANDS, "dell", "1", "192.168.1.122");
System.out.println(disposeResultMessage(result));
}

}