java中如何通过IO流将稀疏数组写入磁盘和从磁盘中读取，整行存，整行取

//写入磁盘

public static void writ(int sparseArr[][]) {

Systemoutprintln("写入磁盘的数据中~~~~~~");

File file = new File("E:\\java\\sparseArrtxt");

BufferedWriter bw = null;

try {

bw = new BufferedWriter(new FileWriter(file));

if (!fileexists()) {

filecreateNewFile();

}

StringBuilder allBuilder = new StringBuilder();

for (int[] rows : sparseArr) {

StringBuilder rowBuilder = new StringBuilder();

for (int item : rows) {

rowBuilderappend(item + "\t");

}

allBuilderappend(rowBuilder + "\n");

}

bwwrite(StringvalueOf(allBuilder));

bwflush();

bwclose();

} catch (IOException e) {

eprintStackTrace();

}

}

//读取磁盘

public static int[][] read() {

Systemoutprintln("读取磁盘的数据中~~~~~~");

File file = new File("E:\\java\\sparseArrtxt");

int[][] sparseArr = null;

try {

BufferedReader br = new BufferedReader(new FileReader(file));

if (!fileexists()) {

filecreateNewFile();

}

String row = brreadLine();

String[] s = new String(row)split("\t");

sparseArr = new int[IntegerparseInt(s[0])][IntegerparseInt(s[1])];

while ((row = brreadLine()) != null) {

String[] s2 = new String(row)split("\t");

sparseArr[IntegerparseInt(s2[0])][IntegerparseInt(s2[1])] = IntegerparseInt(s2[2]);

}

brclose();

} catch (IOException e) {

eprintStackTrace();

}

return sparseArr;

}

使用sigar,

private static void file() throws Exception {

Sigar sigar = new Sigar();

FileSystem fslist[] = sigargetFileSystemList();

for (int i = 0; i < fslistlength; i++) {

Systemoutprintln("分区的盘符名称" + i);

FileSystem fs = fslist[i];

// 分区的盘符名称

Systemoutprintln("盘符名称: " + fsgetDevName());

// 分区的盘符名称

Systemoutprintln("盘符路径: " + fsgetDirName());

Systemoutprintln("盘符标志: " + fsgetFlags());//

// 文件系统类型，比如 FAT32、NTFS

Systemoutprintln("盘符类型: " + fsgetSysTypeName());

// 文件系统类型名，比如本地硬盘、光驱、网络文件系统等

Systemoutprintln("盘符类型名: " + fsgetTypeName());

// 文件系统类型

Systemoutprintln("盘符文件系统类型: " + fsgetType());

switch (fsgetType()) {

case 0: // TYPE_UNKNOWN ：未知

break;

case 1: // TYPE_NONE

break;

case 2: // TYPE_LOCAL_DISK : 本地硬盘

// 文件系统总大小

FileSystemUsage usage = null;

usage = sigargetFileSystemUsage(fsgetDirName());

Systemoutprintln(fsgetDevName() + "总大小: " + usagegetTotal() + "KB");

// 文件系统剩余大小

Systemoutprintln(fsgetDevName() + "剩余大小: " + usagegetFree() + "KB");

// 文件系统可用大小

Systemoutprintln(fsgetDevName() + "可用大小: " + usagegetAvail() + "KB");

// 文件系统已经使用量

Systemoutprintln(fsgetDevName() + "已经使用量: " + usagegetUsed() + "KB");

double usePercent = usagegetUsePercent() 100D;

// 文件系统资源的利用率

Systemoutprintln(fsgetDevName() + "资源的利用率: " + usePercent + "%");

break;

case 3:// TYPE_NETWORK ：网络

break;

case 4:// TYPE_RAM_DISK ：闪存

break;

case 5:// TYPE_CDROM ：光驱

break;

case 6:// TYPE_SWAP ：页面交换

break;

}

}

return;

}

package comcmmbutil;

import javaio;

/

linux 下cpu 内存 磁盘 jvm的使用监控

@author avery_leo

/

public class DiskSpace {

/

获取cpu使用情况

@return

@throws Exception

/

public double getcpuUsage() throws Exception {

double cpuUsed = 0;

Runtime rt = RuntimegetRuntime();

Process p = rtexec("top -b -n 1");// 调用系统的“top"命令

BufferedReader in = null;

try {

in = new BufferedReader(new InputStreamReader(pgetInputStream()));

String str = null;

String[] strArray = null;

while ((str = inreadLine()) != null) {

int m = 0;

if (strindexOf(" R ") != -1) {// 只分析正在运行的进程，top进程本身除外 &&

strArray = strsplit(" ");

for (String tmp : strArray) {

if (tmptrim()length() == 0)

continue;

if (++m == 9) {// 第9列为cpu的使用百分比(RedHat

cpuUsed += DoubleparseDouble(tmp);

}

}

}

}

} catch (Exception e) {

eprintStackTrace();

} finally {

inclose();

}

return cpuUsed;

}

/

内存监控

@return

@throws Exception

/

public double getMemUsage() throws Exception {

double menUsed = 0;

Runtime rt = RuntimegetRuntime();

Process p = rtexec("top -b -n 1");// 调用系统的“top"命令

BufferedReader in = null;

try {

in = new BufferedReader(new InputStreamReader(pgetInputStream()));

String str = null;

String[] strArray = null;

while ((str = inreadLine()) != null) {

int m = 0;

if (strindexOf(" R ") != -1) {// 只分析正在运行的进程，top进程本身除外 &&

//

// Systemoutprintln("------------------3-----------------");

strArray = strsplit(" ");

for (String tmp : strArray) {

if (tmptrim()length() == 0)

continue;

if (++m == 10) {

// 9)--第10列为mem的使用百分比(RedHat 9)

menUsed += DoubleparseDouble(tmp);

}

}

}

}

} catch (Exception e) {

eprintStackTrace();

} finally {

inclose();

}

return menUsed;

}

/

获取磁盘空间大小

@return

@throws Exception

/

public double getDeskUsage() throws Exception {

double totalhd = 0;

double usedhd = 0;

Runtime rt = RuntimegetRuntime();

Process p = rtexec("df -hl /home");//df -hl 查看硬盘空间

BufferedReader in = null;

try {

in = new BufferedReader(new InputStreamReader(pgetInputStream()));

String str = null;

String[] strArray = null;

while ((str = inreadLine()) != null) {

int m = 0;

strArray = strsplit(" ");

for (String tmp : strArray) {

if (tmptrim()length() == 0)

continue;

++m;

Systemoutprintln("----tmp----" + tmp);

if (tmpindexOf("G") != -1) {

if (m == 2) {

Systemoutprintln("---G----" + tmp);

if (!tmpequals("") && !tmpequals("0"))

totalhd += DoubleparseDouble(tmp

substring(0, tmplength() - 1)) 1024;

}

if (m == 3) {

Systemoutprintln("---G----" + tmp);

if (!tmpequals("none") && !tmpequals("0"))

usedhd += DoubleparseDouble(tmpsubstring(

0, tmplength() - 1)) 1024;

}

}

if (tmpindexOf("M") != -1) {

if (m == 2) {

Systemoutprintln("---M---" + tmp);

if (!tmpequals("") && !tmpequals("0"))

totalhd += DoubleparseDouble(tmp

substring(0, tmplength() - 1));

}

if (m == 3) {

Systemoutprintln("---M---" + tmp);

if (!tmpequals("none") && !tmpequals("0"))

usedhd += DoubleparseDouble(tmpsubstring(

0, tmplength() - 1));

Systemoutprintln("----3----" + usedhd);

}

}

}

}

} catch (Exception e) {

eprintStackTrace();

} finally {

inclose();

}

//上面写在userd和total写反了，懒得改了，就反着用了

Systemoutprintln("----totalhd----" + usedhd);

Systemoutprintln("----usedhd----" + totalhd);

return (totalhd / usedhd) 100;

}

public static void main(String[] args) throws Exception {

DiskSpace cpu = new DiskSpace();

Systemoutprintln("---------------cpu used:" + cpugetcpuUsage() + "%");

Systemoutprintln("---------------mem used:" + cpugetMemUsage() + "%");

Systemoutprintln("---------------HD used:" + cpugetDeskUsage() + "%");

Systemoutprintln("------------jvm监控----------------------");

Runtime lRuntime = RuntimegetRuntime();

Systemoutprintln("--------------Free Momery:" + lRuntimefreeMemory()+"K");

Systemoutprintln("--------------Max Momery:" + lRuntimemaxMemory()+"K");

Systemoutprintln("--------------Total Momery:" + lRuntimetotalMemory()+"K");

Systemoutprintln("---------------Available Processors :"

+ lRuntimeavailableProcessors());

}

}

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