我有包括5000个IP地址的数组列表。 对于每一个IP地址，我想执行一个SNMPGET请求和FTPDownload命令。 我要实现它的方式，其中，在时间2个不同的线程同时运行前五IP地址。 这些IP地址的执行后，接下来的2个IP地址将在这些线程执行。 谁能帮助该怎么办呢？
在这里，连接是其延伸的螺纹，也可以实现被写入其run（）方法的工作的类。 请帮忙。
Connection newConnection =new Connection(0);
Connection newConnection1 =new Connection(1);
for(int i = 0; i < NE_list.getRowCount(); i=i+2)
{
if(NE_list.getValueAt(i, 0).toString().equals("true")) //Some condition here for the IP Address
{
newConnection.i=i;
newConnection1.i=i+1;
newConnection.runprogram();
newConnection1.runprogram();
}
}
class Connection extends Thread{
int i;
Connection(int val){
i=val;
}
void runprogram(){
start();
}
public void run(){
//SNMP and FTP Code here for IP Address in index i of NE_list
}
}
执行人框架将是您的解决方案最适合。 我创建了一个例子在这里。 您可以增加线程的数量按照您的要求。
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
class SomeRunnable implements Runnable {
int threadNo = -1 ;
List<String> list = new ArrayList<String>();
public SomeRunnable(List list, int threadNo ) {
this.list.addAll(list);
this.threadNo =threadNo;
}
@Override
public void run() {
for (String element : list) {
System.out.println("By Thread:" + threadNo+", Processed Element:" +element);
}
}
}
public class ExecutorDemo {
public static void main(String[] args) {
List<String> list = new ArrayList<String>();
for (int i = 0; i < 100; i++) {
list.add("Elem:"+i);
}
// Divide list
int divideIndex = list.size()/2;
//Create objects of Runnable
SomeRunnable obj1 = new SomeRunnable(list.subList(0, divideIndex),1);
SomeRunnable obj2 = new SomeRunnable(list.subList(divideIndex,list.size()),2);
//Create fixed Thread pool, here pool of 2 thread will created
ExecutorService pool = Executors.newFixedThreadPool(2);
pool.execute(obj1);
pool.execute(obj2);
pool.shutdown();
}
}
兹将具有5个线程工作示例。 只要把test.txt的在您的应用程序CLASS_PATH。
class MyRunnable implements Runnable {
List<List<String>> records;
MyRunnable(List<List<String>> records){
this.records = records;
}
public void run(){
for(List list : records){
System.out.println(Thread.currentThread().getName() + " : "+list.toString());
}
}}
主类 -
public class FileProcessThreads {
public List<List<String>> process(String fileName) throws IOException {
List<List<String>> records = new ArrayList<>();
BufferedReader br = new BufferedReader(new FileReader(fileName));
String line = null;
while((line = br.readLine()) != null){
List<String> listValues = Arrays.asList(line.split(" "));
records.add(listValues);
}
System.out.println(records.size());
return records;
}
public static void main(String[] args) throws IOException {
FileProcessThreads fp = new FileProcessThreads();
List<List<String>> records = fp.process("test.txt");
ExecutorService es = Executors.newFixedThreadPool(5);
int recordsInEachThread = (int) (records.size()/5);
System.out.println(recordsInEachThread);
MyRunnable my1 = new MyRunnable(records.subList(0, recordsInEachThread));
MyRunnable my2 = new MyRunnable(records.subList(recordsInEachThread+1, recordsInEachThread*2));
MyRunnable my3 = new MyRunnable(records.subList(recordsInEachThread*2 + 1, recordsInEachThread*3));
MyRunnable my4 = new MyRunnable(records.subList(recordsInEachThread*3 + 1, recordsInEachThread*4));
MyRunnable my5 = new MyRunnable(records.subList(recordsInEachThread*4 + 1, records.size() - 1));
es.execute(my1);
es.execute(my2);
es.execute(my3);
es.execute(my4);
es.execute(my5);
es.shutdown();
}}
