java没有可用的缓冲区空间，已达到最大连接数
package Simple;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Time;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.text.*;
public class CurrentProg {
//connecting to the database
private static final String DB_DRIVER = "com.mysql.jdbc.Driver";
private static final String DB_CONNECTION ="jdbc:mysql://localhost:3306/db?autoReconnect=true";
private static final String DB_USER = "root";
private static final String DB_PASSWORD = "root";
static Connection dbConnection = null;
static Statement statement = null;
static int total=1;
//Searching between startdate and enddate
public static java.util.LinkedList searchBetweenDates(java.util.Date startDate, java.util.Date endDate) {
java.util.Date begin = new Date(startDate.getTime());
java.util.LinkedList list = new java.util.LinkedList();
list.add(new Date(begin.getTime()));
java.util.Date end = new Date(endDate.getTime());
endDate.setTime(endDate.getTime() + 24*3600*1000);
Calendar cal = Calendar.getInstance();
cal.setTime(begin);
dbConnection = getDBConnection();
while(begin.compareTo(endDate)<0){
begin = new Date(begin.getTime() + 86400000);
list.add(new Date(begin.getTime()));
Timestamp timestamp = new Timestamp(new Date().getTime());
//For a single day calculation: 24hours*60mins=1440 /2 (2 mins time difference as per the requirement) = 720
for (int j = 0; j < 720; j++) {
cal.add(Calendar.MINUTE, 2);
timestamp = new Timestamp(cal.getTime().getTime());
String S = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(timestamp);
String[] parts = S.split(" ");
String date=parts[0];
String time=parts[1];
cal.getTime().toString();
// To create data loop into a List
List<String> records = new ArrayList<String>();
StringBuffer record = new StringBuffer();
for (int i = 1; i <= total; i++) {
records = new ArrayList<String>(total);
int a2 = 220 + j % 31; // 230 - 244 by 1
String wString = Integer.toString(a2);
String a = String.valueOf(a2);
double b2 = 0.00 + j % 3.7 ; // 1.3 - 3.9 by 0.1
String aString = Double.toString(b2);
String b = String.valueOf(b2);
b = b.substring(0, Math.min(b.length(), 5));
record.delete(0, record.length());
record.append(a + "," + b + ",'"+ date + "', '"+ time + "'");
record.append("\t\t");
record.append("\n");
records.add(record.toString());
//Insert Query
String insertTableSQL = "INSERT INTO cmd1"
+ "(a, b, date, time) " + "VALUES"
+ "("+record.toString()+")";
System.out.println("insertTableSQL - " + insertTableSQL); // Statement.executeUpdate(insertTableSQL);
try {
statement = dbConnection.createStatement();
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into Db table!");
} catch (SQLException e) {
System.out.println(e.getMessage());
}
try {
// dbConnection = getDBConnection();
statement = dbConnection.createStatement();
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into Db table!");
} catch (SQLException e) {
System.out.println(e.getMessage());
}
finally {
// httpPost.releaseConnection()
try{
if(statement!=null)
statement.close();
}
finally{
}
try{
if(dbConnection!=null)
dbConnection.close();
}
finally{
}
}
}
}
}
return list;
}
@SuppressWarnings("unused")
public static void main(String[] args) throws Exception {
//To enter startDate and enddate
// EntityManagerFactory.getCache().evictAll;
SimpleDateFormat startDate=new java.text.SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat endDate=new java.text.SimpleDateFormat("yyyy-MM-dd");
java.util.LinkedList hitList = searchBetweenDates(
startDate.parse("2016-01-01"),
endDate.parse("2016-03-01"));
String[] combo = new String[hitList.size()];
for(int i=0; i<hitList.size(); i++)
combo[i] = new java.text.SimpleDateFormat("yyyy-MM-dd").format(((java.util.Date)hitList.get(i)));
}
private static void insertRecordIntodb() {
//
}
private static Connection getDBConnection() {
Connection dbConnection = null;
try {
Class.forName(DB_DRIVER);
} catch (ClassNotFoundException e) {
System.out.println(e.getMessage());
}
try {
dbConnection = DriverManager.getConnection(DB_CONNECTION, DB_USER, DB_PASSWORD);
return dbConnection;
} catch (SQLException e) {
System.out.println(e.getMessage());
}
return dbConnection;
}
}
事务处理期间服务器连接失败。由于基础异常：“java”。网SocketException:java。网SocketException:没有可用的缓冲区空间（已达到最大连接数？）：连接'
** BEGIN NESTED EXCEPTION **
java.net.SocketException
MESSAGE: java.net.SocketException: No buffer space available (maximum connections reached?): connect
STACKTRACE:
java.net.SocketException: java.net.SocketException: No buffer space available (maximum connections reached?): connect
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:276)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2717)
at com.mysql.jdbc.Connection.<init>(Connection.java:1509)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Simple.CurrentProg.getDBConnection(CurrentProg.java:186)
at Simple.CurrentProg.searchBetweenDates(CurrentProg.java:126)
at Simple.CurrentProg.main(CurrentProg.java:164)
** END NESTED EXCEPTION **
Attempted reconnect 3 times. Giving up.
Exception in thread "main" java.lang.NullPointerException
at Simple.CurrentProg.searchBetweenDates(CurrentProg.java:137)
at Simple.CurrentProg.main(CurrentProg.java:164)
在这里，我试图将java程序与数据库连接起来，但当我尝试插入大数据时，比如说1个月，所以它只获取16000条记录，不超过我想要的数量。数据应该按照给定的日期范围插入，我应该做些什么来获取这些数据。在stacktrace中，它会显示一个异常，因为没有可用的缓冲区空间，因此未达到最大连接数。提前谢谢
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