请问Java如何动态显示当前内存占用率饼图
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0.5\u79d2\u5237\u65b0\u4e00\u6b21\u7684\u8bdd\u7528\u4e00\u4e2atimer\u63a7\u4ef6\u6765\u63a7\u5236 \u5728tick\u8fd9\u4e2a\u4e8b\u4ef6\u4e2d\u5199\u4f60\u7684\u5904\u7406\u8fc7\u7a0b
\u4e3b\u8981\u662f\u83b7\u53d6\u7269\u7406\u5185\u5b58\u548c\u5df2\u7ecf\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u8fd9\u4e24\u4e2a\u6570\u503c \u53ef\u4ee5\u901a\u8fc7kernel32\u8fd9\u4e2adll\u4e2d\u7684api\u83b7\u53d6\u3002
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public struct MEMORY_INFO
{
public uint dwLength;
public uint dwMemoryLoad;
public uint dwTotalPhys;
public uint dwAvailPhys;
public uint dwTotalPageFile;
public uint dwAvailPageFile;
public uint dwTotalVirtual;
public uint dwAvailVirtual;
}
\u5176\u6b21\uff1a\u5efa\u7acb\u4e00\u4e2a\u5185\u5b58\u83b7\u53d6\u7c7b \u91cc\u9762\u8c03\u7528\u90a3\u4e2a\u65b9\u6cd5
public class getmemory
{
[DllImport("kernel32")]
public static extern void GlobalMemoryStatus(ref MEMORY_INFO meminfo);
}
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public void getmemory()
{
MEMORY_INFO MemInfo;
MemInfo = new MEMORY_INFO();
getmemory.GlobalMemoryStatus(ref MemInfo);
string MemoryLoad = MemInfo.dwMemoryLoad.ToString() + "%\u7684\u5185\u5b58\u6b63\u5728\u4f7f\u7528 ";
string TotalPhys = "\u7269\u7406\u5185\u5b58\u5171\u6709 " + MemInfo.dwTotalPhys.ToString() + "\u5b57\u8282 ";
string AvailPhys = "\u53ef\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u6709 " + MemInfo.dwAvailPhys.ToString() + "\u5b57\u8282 ";
string TotalPageFile = "\u4ea4\u6362\u6587\u4ef6\u603b\u5927\u5c0f\u4e3a " + MemInfo.dwTotalPageFile.ToString() + "\u5b57\u8282 ";
string AvailPageFile = "\u5c1a\u53ef\u4ea4\u6362\u6587\u4ef6\u5927\u5c0f\u4e3a " + MemInfo.dwAvailPageFile.ToString() + "\u5b57\u8282 ";
string TotalVirtual = "\u603b\u865a\u62df\u5185\u5b58\u6709 " + MemInfo.dwTotalVirtual.ToString() + "\u5b57\u8282 ";
}
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0.5\u79d2\u5237\u65b0\u4e00\u6b21\u7684\u8bdd\u7528\u4e00\u4e2atimer\u63a7\u4ef6\u6765\u63a7\u5236 \u5728tick\u8fd9\u4e2a\u4e8b\u4ef6\u4e2d\u5199\u4f60\u7684\u5904\u7406\u8fc7\u7a0b
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\u9996\u5148\uff1a\u5efa\u7acb\u4e00\u4e2a\u7ed3\u6784\u4f53 \u7528\u4e8e\u63a5\u6536api\u8fd4\u56de\u7684\u4fe1\u606f\uff08api\u91cc\u90a3\u4e2a\u65b9\u6cd5\u89c4\u5b9a\u7684\uff09
public struct MEMORY_INFO
{
public uint dwLength;
public uint dwMemoryLoad;
public uint dwTotalPhys;
public uint dwAvailPhys;
public uint dwTotalPageFile;
public uint dwAvailPageFile;
public uint dwTotalVirtual;
public uint dwAvailVirtual;
}
\u5176\u6b21\uff1a\u5efa\u7acb\u4e00\u4e2a\u5185\u5b58\u83b7\u53d6\u7c7b \u91cc\u9762\u8c03\u7528\u90a3\u4e2a\u65b9\u6cd5
public class getmemory
{
[DllImport("kernel32")]
public static extern void GlobalMemoryStatus(ref MEMORY_INFO meminfo);
}
\u6700\u540e\u67e5\u8be2\u65b9\u6cd5\uff1a
public void getmemory()
{
MEMORY_INFO MemInfo;
MemInfo = new MEMORY_INFO();
getmemory.GlobalMemoryStatus(ref MemInfo);
string MemoryLoad = MemInfo.dwMemoryLoad.ToString() + "%\u7684\u5185\u5b58\u6b63\u5728\u4f7f\u7528 ";
string TotalPhys = "\u7269\u7406\u5185\u5b58\u5171\u6709 " + MemInfo.dwTotalPhys.ToString() + "\u5b57\u8282 ";
string AvailPhys = "\u53ef\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u6709 " + MemInfo.dwAvailPhys.ToString() + "\u5b57\u8282 ";
string TotalPageFile = "\u4ea4\u6362\u6587\u4ef6\u603b\u5927\u5c0f\u4e3a " + MemInfo.dwTotalPageFile.ToString() + "\u5b57\u8282 ";
string AvailPageFile = "\u5c1a\u53ef\u4ea4\u6362\u6587\u4ef6\u5927\u5c0f\u4e3a " + MemInfo.dwAvailPageFile.ToString() + "\u5b57\u8282 ";
string TotalVirtual = "\u603b\u865a\u62df\u5185\u5b58\u6709 " + MemInfo.dwTotalVirtual.ToString() + "\u5b57\u8282 ";
}
JXM：Monitoring and Management Interface for the Java™ Platform
通过jmx可以监控vm内存使用,系统内存使用等
以下是网上某博客代码，特点是通过window和linux命令获得CPU使用率。
Java代码
利用java程序实现获取计算机cpu利用率和内存使用信息。
创建一个Bean用来存贮要得到的信
public class MonitorInfoBean {
/** 可使用内存. */
private long totalMemory;
/** 剩余内存. */
private long freeMemory;
/** 最大可使用内存. */
private long maxMemory;
/** 操作系统. */
private String osName;
/** 总的物理内存. */
private long totalMemorySize;
/** 剩余的物理内存. */
private long freePhysicalMemorySize;
/** 已使用的物理内存. */
private long usedMemory;
/** 线程总数. */
private int totalThread;
/** cpu使用率. */
private double cpuRatio;
public long getFreeMemory() {
return freeMemory;
}
public void setFreeMemory(long freeMemory) {
this.freeMemory = freeMemory;
}
public long getFreePhysicalMemorySize() {
return freePhysicalMemorySize;
}
public void setFreePhysicalMemorySize(long freePhysicalMemorySize) {
this.freePhysicalMemorySize = freePhysicalMemorySize;
}
public long getMaxMemory() {
return maxMemory;
}
public void setMaxMemory(long maxMemory) {
this.maxMemory = maxMemory;
}
public String getOsName() {
return osName;
}
public void setOsName(String osName) {
this.osName = osName;
}
public long getTotalMemory() {
return totalMemory;
}
public void setTotalMemory(long totalMemory) {
this.totalMemory = totalMemory;
}
public long getTotalMemorySize() {
return totalMemorySize;
}
public void setTotalMemorySize(long totalMemorySize) {
this.totalMemorySize = totalMemorySize;
}
public int getTotalThread() {
return totalThread;
}
public void setTotalThread(int totalThread) {
this.totalThread = totalThread;
}
public long getUsedMemory() {
return usedMemory;
}
public void setUsedMemory(long usedMemory) {
this.usedMemory = usedMemory;
}
public double getCpuRatio() {
return cpuRatio;
}
public void setCpuRatio(double cpuRatio) {
this.cpuRatio = cpuRatio;
}
}
之后，建立bean的接口
public interface IMonitorService {
public MonitorInfoBean getMonitorInfoBean() throws Exception;
}
然后，就是最关键的，得到cpu的利用率，已用内存，可用内存，最大内存等信息。
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import sun.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;
import java.io.*;
import java.util.StringTokenizer;
/**
* 获取系统信息的业务逻辑实现类.
* @author GuoHuang
*/
public class MonitorServiceImpl implements IMonitorService {
private static final int CPUTIME = 30;
private static final int PERCENT = 100;
private static final int FAULTLENGTH = 10;
private static final File versionFile = new File("/proc/version");
private static String linuxVersion = null;
/**
* 获得当前的监控对象.
* @return 返回构造好的监控对象
* @throws Exception
* @author GuoHuang
*/
public MonitorInfoBean getMonitorInfoBean() throws Exception {
int kb = 1024;
// 可使用内存
long totalMemory = Runtime.getRuntime().totalMemory() / kb;
// 剩余内存
long freeMemory = Runtime.getRuntime().freeMemory() / kb;
// 最大可使用内存
long maxMemory = Runtime.getRuntime().maxMemory() / kb;
OperatingSystemMXBean osmxb = (OperatingSystemMXBean) ManagementFactory
.getOperatingSystemMXBean();
// 操作系统
String osName = System.getProperty("os.name");
// 总的物理内存
long totalMemorySize = osmxb.getTotalPhysicalMemorySize() / kb;
// 剩余的物理内存
long freePhysicalMemorySize = osmxb.getFreePhysicalMemorySize() / kb;
// 已使用的物理内存
long usedMemory = (osmxb.getTotalPhysicalMemorySize() - osmxb
.getFreePhysicalMemorySize())
/ kb;
// 获得线程总数
ThreadGroup parentThread;
for (parentThread = Thread.currentThread().getThreadGroup(); parentThread
.getParent() != null; parentThread = parentThread.getParent())
;
int totalThread = parentThread.activeCount();
double cpuRatio = 0;
if (osName.toLowerCase().startsWith("windows")) {
cpuRatio = this.getCpuRatioForWindows();
}
else {
cpuRatio = this.getCpuRateForLinux();
}
// 构造返回对象
MonitorInfoBean infoBean = new MonitorInfoBean();
infoBean.setFreeMemory(freeMemory);
infoBean.setFreePhysicalMemorySize(freePhysicalMemorySize);
infoBean.setMaxMemory(maxMemory);
infoBean.setOsName(osName);
infoBean.setTotalMemory(totalMemory);
infoBean.setTotalMemorySize(totalMemorySize);
infoBean.setTotalThread(totalThread);
infoBean.setUsedMemory(usedMemory);
infoBean.setCpuRatio(cpuRatio);
return infoBean;
}
private static double getCpuRateForLinux(){
InputStream is = null;
InputStreamReader isr = null;
BufferedReader brStat = null;
StringTokenizer tokenStat = null;
try{
System.out.println("Get usage rate of CUP , linux version: "+linuxVersion);
Process process = Runtime.getRuntime().exec("top -b -n 1");
is = process.getInputStream();
isr = new InputStreamReader(is);
brStat = new BufferedReader(isr);
if(linuxVersion.equals("2.4")){
brStat.readLine();
brStat.readLine();
brStat.readLine();
brStat.readLine();
tokenStat = new StringTokenizer(brStat.readLine());
tokenStat.nextToken();
tokenStat.nextToken();
String user = tokenStat.nextToken();
tokenStat.nextToken();
String system = tokenStat.nextToken();
tokenStat.nextToken();
String nice = tokenStat.nextToken();
System.out.println(user+" , "+system+" , "+nice);
user = user.substring(0,user.indexOf("%"));
system = system.substring(0,system.indexOf("%"));
nice = nice.substring(0,nice.indexOf("%"));
float userUsage = new Float(user).floatValue();
float systemUsage = new Float(system).floatValue();
float niceUsage = new Float(nice).floatValue();
return (userUsage+systemUsage+niceUsage)/100;
}else{
brStat.readLine();
brStat.readLine();
tokenStat = new StringTokenizer(brStat.readLine());
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
tokenStat.nextToken();
String cpuUsage = tokenStat.nextToken();
System.out.println("CPU idle : "+cpuUsage);
Float usage = new Float(cpuUsage.substring(0,cpuUsage.indexOf("%")));
return (1-usage.floatValue()/100);
}
} catch(IOException ioe){
System.out.println(ioe.getMessage());
freeResource(is, isr, brStat);
return 1;
} finally{
freeResource(is, isr, brStat);
}
}
private static void freeResource(InputStream is, InputStreamReader isr, BufferedReader br){
try{
if(is!=null)
is.close();
if(isr!=null)
isr.close();
if(br!=null)
br.close();
}catch(IOException ioe){
System.out.println(ioe.getMessage());
}
}
/**
* 获得CPU使用率.
* @return 返回cpu使用率
* @author GuoHuang
*/
private double getCpuRatioForWindows() {
try {
String procCmd = System.getenv("windir")
+ "\\system32\\wbem\\wmic.exe process get Caption,CommandLine,"
+ "KernelModeTime,ReadOperationCount,ThreadCount,UserModeTime,WriteOperationCount";
// 取进程信息
long[] c0 = readCpu(Runtime.getRuntime().exec(procCmd));
Thread.sleep(CPUTIME);
long[] c1 = readCpu(Runtime.getRuntime().exec(procCmd));
if (c0 != null && c1 != null) {
long idletime = c1[0] - c0[0];
long busytime = c1[1] - c0[1];
return Double.valueOf(
PERCENT * (busytime) / (busytime + idletime))
.doubleValue();
} else {
return 0.0;
}
} catch (Exception ex) {
ex.printStackTrace();
return 0.0;
}
}
/**
* 读取CPU信息.
* @param proc
* @return
* @author GuoHuang
*/
private long[] readCpu(final Process proc) {
long[] retn = new long[2];
try {
proc.getOutputStream().close();
InputStreamReader ir = new InputStreamReader(proc.getInputStream());
LineNumberReader input = new LineNumberReader(ir);
String line = input.readLine();
if (line == null || line.length() < FAULTLENGTH) {
return null;
}
int capidx = line.indexOf("Caption");
int cmdidx = line.indexOf("CommandLine");
int rocidx = line.indexOf("ReadOperationCount");
int umtidx = line.indexOf("UserModeTime");
int kmtidx = line.indexOf("KernelModeTime");
int wocidx = line.indexOf("WriteOperationCount");
long idletime = 0;
long kneltime = 0;
long usertime = 0;
while ((line = input.readLine()) != null) {
if (line.length() < wocidx) {
continue;
}
// 字段出现顺序：Caption,CommandLine,KernelModeTime,ReadOperationCount,
// ThreadCount,UserModeTime,WriteOperation
String caption = Bytes.substring(line, capidx, cmdidx - 1)
.trim();
String cmd = Bytes.substring(line, cmdidx, kmtidx - 1).trim();
if (cmd.indexOf("wmic.exe") >= 0) {
continue;
}
// log.info("line="+line);
if (caption.equals("System Idle Process")
|| caption.equals("System")) {
idletime += Long.valueOf(
Bytes.substring(line, kmtidx, rocidx - 1).trim())
.longValue();
idletime += Long.valueOf(
Bytes.substring(line, umtidx, wocidx - 1).trim())
.longValue();
continue;
}
kneltime += Long.valueOf(
Bytes.substring(line, kmtidx, rocidx - 1).trim())
.longValue();
usertime += Long.valueOf(
Bytes.substring(line, umtidx, wocidx - 1).trim())
.longValue();
}
retn[0] = idletime;
retn[1] = kneltime + usertime;
return retn;
} catch (Exception ex) {
ex.printStackTrace();
} finally {
try {
proc.getInputStream().close();
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
/** 测试方法.
* @param args
* @throws Exception
* @author GuoHuang
*/
public static void main(String[] args) throws Exception {
IMonitorService service = new MonitorServiceImpl();
MonitorInfoBean monitorInfo = service.getMonitorInfoBean();
System.out.println("cpu占有率=" + monitorInfo.getCpuRatio());
System.out.println("可使用内存=" + monitorInfo.getTotalMemory());
System.out.println("剩余内存=" + monitorInfo.getFreeMemory());
System.out.println("最大可使用内存=" + monitorInfo.getMaxMemory());
System.out.println("操作系统=" + monitorInfo.getOsName());
System.out.println("总的物理内存=" + monitorInfo.getTotalMemorySize() + "kb");
System.out.println("剩余的物理内存=" + monitorInfo.getFreeMemory() + "kb");
System.out.println("已使用的物理内存=" + monitorInfo.getUsedMemory() + "kb");
System.out.println("线程总数=" + monitorInfo.getTotalThread() + "kb");
}
}
其中，Bytes类用来处理字符串
public class Bytes {
public static String substring(String src, int start_idx, int end_idx){
byte[] b = src.getBytes();
String tgt = "";
for(int i=start_idx; i<=end_idx; i++){
tgt +=(char)b[i];
}
return tgt;
}
}
Ctrl+Alt+Del 这三个键一起摁打开 Windows任务管理器 点下 性能 就能清楚的看出来内存使用和CPU使用。估计能帮到你吧
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