测试主线程，MapFetch.java
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package
com.sohu.servlet;
import
java.util.ArrayList;
import
java.util.HashMap;
import
java.util.Iterator;
import
java.util.List;
import
java.util.Map;
import
java.util.Map.Entry;
import
java.util.Set;
/**
* @author liweihan (liweihan@sohu-inc.com)
* @version 1.0 (2015年7月27日 下午2:18:47)
*/
public
class
MapFetch {
static
Map<String, String> map =
new
HashMap<String, String>();
public
static
void
main(String[] args) {
System.out.println(
"....test...."
);
map.put(
"1"
,
"one"
);
map.put(
"2"
,
"two"
);
map.put(
"3"
,
"three"
);
for
(
int
i =
0
; i <
300000
; i++) {
map.put(
"key"
+ i,
"value"
+i);
}
//1.循环map
/*Set<String> set = map.keySet();
Iterator<String> it = set.iterator();
while(it.hasNext()) {
String key = (String) it.next();
String value = map.get(key);
System.out.println(key + " → " + value);
}*/
//2.循环map
/*Set<Entry<String,String>> se = map.entrySet();
for (Entry<String,String> en : se) {
System.out.println(en.getKey() + " : " + en.getValue());
}*/
//3.循环map
/* Set<Entry<String, String>> set = map.entrySet();
Iterator<Entry<String, String>> iterator = set.iterator();
while (iterator.hasNext()) {
Entry<String, String> entry = iterator.next();
String key = entry.getKey();
String value = entry.getValue();
System.out.println( key + " -- " + value);
}*/
//4.合并map
/*Map<String, String> map1 = new HashMap<String, String>();
map1.put("1", "one");
Map<String, String> map2 = new HashMap<String, String>();
map2.put("2", "two");
map1.putAll(map2);
System.out.println(map1);*/
//5.分割map+多线程
/* int totalSize = map.size();
System.out.println("Map totalSize : " + totalSize);
//线程的数量
int threadNum = 16;
//每个线程处理的数量
int threadSize = totalSize / threadNum;
System.out.println("每个线程处理的数量：" + threadSize);
//join()线程
List<Thread> threadList = new ArrayList<Thread>();
for (int i = 0; i < threadNum; i++) {
int end;
if (i == threadNum - 1) {
//最后一个线程
end = threadSize + totalSize % threadNum ;
} else {
end = threadSize;
}
int beginNum = i * threadSize;
int endNum = i * threadSize + end;
System.out.println(i + " begin : " + beginNum + "," + endNum);
int sync = 0;
//分割map
Map<String, String> mapThread = new HashMap<String, String>();
for(Entry<String, String> entry : map.entrySet()) {
sync++;
if (sync > beginNum && sync <= endNum) {
mapThread.put(entry.getKey(), entry.getValue());
}
}
StarRelationThread st = new StarRelationThread(mapThread,map,i);
Thread thread = new Thread(st);
threadList.add(thread);
thread.start();
}
//join()线程-必须等join的线程执行完,才能继续执行下面的代码
for (Thread thread : threadList) {
try {
thread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
map.clear();
System.out.println("------------over---------------");
*/
//6.map的分割
Iterator<Entry<String, String>> iterator = map.entrySet().iterator();
Map<String, String> mapThread0 =
new
HashMap<String, String>();
Map<String, String> mapThread1 =
new
HashMap<String, String>();
Map<String, String> mapThread2 =
new
HashMap<String, String>();
Map<String, String> mapThread3 =
new
HashMap<String, String>();
Map<String, String> mapThread4 =
new
HashMap<String, String>();
Map<String, String> mapThread5 =
new
HashMap<String, String>();
Map<String, String> mapThread6 =
new
HashMap<String, String>();
Map<String, String> mapThread7 =
new
HashMap<String, String>();
Map<String, String> mapThread8 =
new
HashMap<String, String>();
Map<String, String> mapThread9 =
new
HashMap<String, String>();
Map<String, String> mapThread10 =
new
HashMap<String, String>();
Map<String, String> mapThread_default =
new
HashMap<String, String>();
while
(iterator.hasNext()) {
Map.Entry<String, String> entry = iterator.next();
String key = entry.getKey();
String.valueOf(key);
int
hashCode = Math.abs(String.valueOf(key).hashCode());
switch
(hashCode %
11
) {
//分割成11份
case
0
:
mapThread0.put(key, map.get(key));
break
;
case
1
:
mapThread1.put(key, map.get(key));
break
;
case
2
:
mapThread2.put(key, map.get(key));
break
;
case
3
:
mapThread3.put(key, map.get(key));
break
;
case
4
:
mapThread4.put(key, map.get(key));
break
;
case
5
:
mapThread5.put(key, map.get(key));
break
;
case
6
:
mapThread6.put(key, map.get(key));
break
;
case
7
:
mapThread7.put(key, map.get(key));
break
;
case
8
:
mapThread8.put(key, map.get(key));
break
;
case
9
:
mapThread9.put(key, map.get(key));
break
;
case
10
:
mapThread10.put(key, map.get(key));
break
;
default
:
mapThread_default.put(key, map.get(key));
break
;
}
}
System.out.println(mapThread0.size());
System.out.println(mapThread1.size());
System.out.println(mapThread2.size());
System.out.println(mapThread3.size());
System.out.println(mapThread4.size());
System.out.println(mapThread5.size());
System.out.println(mapThread6.size());
System.out.println(mapThread7.size());
System.out.println(mapThread8.size());
System.out.println(mapThread9.size());
System.out.println(mapThread10.size());
System.out.println(mapThread_default.size());
int
a = mapThread0.size() +
mapThread1.size() +
mapThread2.size() +
mapThread3.size() +
mapThread4.size() +
mapThread5.size() +
mapThread6.size() +
mapThread7.size() +
mapThread8.size() +
mapThread9.size() +
mapThread10.size() +
mapThread_default.size();
System.out.println(
"a:"
+ a);
}
}
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业务处理子线程StarRelationThread.java
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package
com.sohu.servlet;
import
java.util.Map;
import
java.util.Map.Entry;
/**
* @author liweihan (liweihan@sohu-inc.com)
* @version 1.0 (2015年7月27日 下午3:47:09)
*/
public
class
StarRelationThread
implements
Runnable{
private
Map<String, String> mapThread ;
private
Map<String, String> map ;
private
int
threadNum;
public
StarRelationThread(Map<String, String> mapThread ,Map<String, String> map,
int
threadNum) {
this
.map = map;
this
.threadNum = threadNum;
this
.mapThread = mapThread;
}
@Override
public
void
run() {
System.out.println(
" 第 "
+ threadNum +
" 个线程处理-开始 ,此线程处理的数量 "
+ mapThread.size() +
",总的数量为："
+map.size());
System.out.println(
"处理数据 ,并写入redis中"
);
if
(threadNum >
3
) {
try
{
Thread.sleep(
20000
);
}
catch
(InterruptedException e) {
e.printStackTrace();
}
}
int
sync =
0
;
for
(Entry<String, String> en : mapThread.entrySet()) {
sync++;
if
(sync <
2
) {
System.out.println(
"key :"
+ en.getKey() +
", value :"
+ en.getValue());
}
}
System.out.println(
" 第 "
+ threadNum +
" 个线程执行完毕！"
);
}
}
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本文转自韩立伟 51CTO博客，原文链接：http://blog.51cto.com/hanchaohan/1680036，如需转载请自行联系原作者
