Java使用JDBC-连接太多异常？
我试图从url读取数据并存储在字符串中，当我将该字符串值存储在我的sql表中时，出现以下异常Java使用JDBC-连接太多异常？,java,mysql,jdbc,Java,Mysql,Jdbc,我试图从url读取数据并存储在字符串中，当我将该字符串值存储在我的sql表中时，出现以下异常 Exception in thread "main" com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections" 如何删除此异常 这是y代码 pu
Exception in thread "main" com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Data source rejected establishment of connection, message from server: "Too many connections"
public class DownLoadData {
Statement st = null;
Connection connection = null;
String driverName = "com.mysql.jdbc.Driver";
String serverName = "localhost";
String schema = "mandi";
String url1 = "jdbc:mysql://" + serverName + "/" + schema;
String username = "root";
String password = "";
public void DownloadCommodity() throws ClassNotFoundException, SQLException {
int j = 0;
String htmlTableText = null;
System.setProperty("webdriver.chrome.driver", "C:\\Users\\SHAKTI\\Desktop\\JarFiles\\chromedriver_win32\\chromedriver.exe");
WebDriver driver = new ChromeDriver();
String commodity = "Jo";
String commo[] = {"Paddy", "Rice", "Jwar", "Barley", "Corn"
};
for (String com : commo) {
String sDate = "27/03/2014";
String url = "http://www.upmandiparishad.in/commodityWiseAll.aspx";
driver.get(url);
new Select(driver.findElement(By.id("ctl00_ContentPlaceHolder1_ddl_commodity"))).selectByVisibleText(com);
driver.findElement(By.id("ctl00_ContentPlaceHolder1_txt_rate")).sendKeys(sDate);
driver.findElement(By.id("ctl00_ContentPlaceHolder1_btn_show")).click();
WebElement findElement = driver.findElement(By.id("ctl00_ContentPlaceHolder1_GridView1"));
htmlTableText = findElement.getText();
// String html=find.getText();
// do whatever you want now, This is raw table values.
htmlTableText = htmlTableText.replace("S.No.DistrictMarketPrice", "");
htmlTableText = htmlTableText.replaceAll("\\s(\\d+\\s[A-Z])", "\n$1");
htmlTableText = htmlTableText.replaceAll("(?=(.*?[ ]){4,}).*?[\n\r]", "");
htmlTableText = htmlTableText.replace("S.No. District Market Price", "");
System.out.println(htmlTableText);
String s[] = htmlTableText.split("");
StringTokenizer str = new StringTokenizer(htmlTableText);
while (str.hasMoreTokens()) // for(int i=0;i<s.length;i++)
// if(str.hasMoreElements())
{
String no = str.nextElement().toString();
String city = str.nextElement().toString();
String mandi = str.nextElement().toString();
String price = str.nextElement().toString();
Class.forName(driverName);
connection = DriverManager.getConnection(url1, username, password);
PreparedStatement ps = connection.prepareStatement("insert into commoditydemo values(?,?,?,?,?,?)");
ps.setString(1, no);
ps.setString(2, city);
ps.setString(3, mandi);
ps.setString(4, price);
ps.setString(5, com);
ps.setString(6, "0");
j = ps.executeUpdate();
connection.close();
}
}
driver.close();
driver.quit();
if (j == 1) {
System.out.println("data inserted");
} else {
System.out.println("not inserted");
}
}
公共类下载数据{
语句st=null；
连接=空；
String driverName=“com.mysql.jdbc.Driver”；
字符串serverName=“localhost”；
字符串schema=“mandi”；
String url1=“jdbc:mysql://”+serverName+“/”+schema；
字符串username=“root”；
字符串密码=”；
public void DownloadCommodity（）抛出ClassNotFoundException、SQLException{
int j=0；
字符串htmlTableText=null；
System.setProperty（“webdriver.chrome.driver”，“C:\\Users\\SHAKTI\\Desktop\\JarFiles\\chromedriver\u win32\\chromedriver.exe”）；
WebDriver驱动程序=新的ChromeDriver（）；
字符串商品=“Jo”；
字符串commo[]={“稻谷”、“大米”、“Jwar”、“大麦”、“玉米”
};
用于（字符串com:commo）{
字符串sDate=“27/03/2014”；
字符串url=”http://www.upmandiparishad.in/commodityWiseAll.aspx";
获取（url）；
新选择（driver.findElement（By.id（“ctl00\u ContentPlaceHolder1\u ddl\u商品”）））。选择ByVisibleText（com）；
driver.findElement（By.id（“ctl00\u ContentPlaceHolder1\u txt\u rate”））.sendKeys（sDate）；
driver.findElement（By.id（“ctl00\u ContentPlaceHolder1\u btn\u show”）。单击（）；
WebElement findElement=driver.findElement（By.id（“ctl00\u ContentPlaceHolder1\u GridView1”）；
htmlTableText=findElement.getText（）；
//字符串html=find.getText（）；
//现在做你想做的，这是原始表值。
htmlTableText=htmlTableText.replace（“S.No.DistrictMarketPrice”，”）；
htmlTableText=htmlTableText.replaceAll（\\s（\\d+\\s[A-Z]），“\n$1”）；
htmlTableText=htmlTableText.replaceAll（（？=（.*？[]）{4，}）。*？[\n\r]，“”）；
htmlTableText=htmlTableText.replace（“S.No.District Market Price”，”）；
System.out.println（htmlTableText）；
字符串s[]=htmlTableText.split（“”）；
StringTokenizer str=新的StringTokenizer（htmlTableText）；
while（str.hasMoreTokens（））//for（int i=0；i您正在while循环中重复打开连接：
connection = DriverManager.getConnection(url1, username, password);
尝试将连接的建立置于循环外部（之前）然后在循环完成后将其关闭。您正在while循环内部重复打开连接：
connection = DriverManager.getConnection(url1, username, password);
尝试将连接的建立置于循环外部（之前）然后在循环完成后将其关闭。您正在while循环内部重复打开连接：
connection = DriverManager.getConnection(url1, username, password);
尝试将连接的建立置于循环外部（之前）然后在循环完成后将其关闭。您正在while循环内部重复打开连接：
connection = DriverManager.getConnection(url1, username, password);
尝试将建立连接放在循环外部（之前）然后在循环完成后将其关闭。尝试以下代码：
我刚刚初始化了外的连接，而循环
public class DownLoadData {
Statement st = null;
Connection connection = null;
String driverName = "com.mysql.jdbc.Driver";
String serverName = "localhost";
String schema = "mandi";
String url1 = "jdbc:mysql://" + serverName + "/" + schema;
String username = "root";
String password = "";
public void DownloadCommodity() throws ClassNotFoundException, SQLException {
int j = 0;
String htmlTableText = null;
System.setProperty("webdriver.chrome.driver", "C:\\Users\\SHAKTI\\Desktop\\JarFiles\\chromedriver_win32\\chromedriver.exe");
WebDriver driver = new ChromeDriver();
String commodity = "Jo";
String commo[] = {"Paddy", "Rice", "Jwar", "Barley", "Corn"
};
for (String com : commo) {
String sDate = "27/03/2014";
String url = "http://www.upmandiparishad.in/commodityWiseAll.aspx";
driver.get(url);
new Select(driver.findElement(By.id("ctl00_ContentPlaceHolder1_ddl_commodity"))).selectByVisibleText(com);
driver.findElement(By.id("ctl00_ContentPlaceHolder1_txt_rate")).sendKeys(sDate);
driver.findElement(By.id("ctl00_ContentPlaceHolder1_btn_show")).click();
WebElement findElement = driver.findElement(By.id("ctl00_ContentPlaceHolder1_GridView1"));
htmlTableText = findElement.getText();
// String html=find.getText();
// do whatever you want now, This is raw table values.
htmlTableText = htmlTableText.replace("S.No.DistrictMarketPrice", "");
htmlTableText = htmlTableText.replaceAll("\\s(\\d+\\s[A-Z])", "\n$1");
htmlTableText = htmlTableText.replaceAll("(?=(.*?[ ]){4,}).*?[\n\r]", "");
htmlTableText = htmlTableText.replace("S.No. District Market Price", "");
System.out.println(htmlTableText);
String s[] = htmlTableText.split("");
StringTokenizer str = new StringTokenizer(htmlTableText);
connection = DriverManager.getConnection(url1, username, password);
while (str.hasMoreTokens()) // for(int i=0;i<s.length;i++)
// if(str.hasMoreElements())
{
String no = str.nextElement().toString();
String city = str.nextElement().toString();
String mandi = str.nextElement().toString();
String price = str.nextElement().toString();
Class.forName(driverName);
PreparedStatement ps = connection.prepareStatement("insert into commoditydemo values(?,?,?,?,?,?)");
ps.setString(1, no);
ps.setString(2, city);
ps.setString(3, mandi);
ps.setString(4, price);
ps.setString(5, com);
ps.setString(6, "0");
j = ps.executeUpdate();
connection.close();
}
}
driver.close();
driver.quit();
if (j == 1) {
System.out.println("data inserted");
} else {
System.out.println("not inserted");
}
}
公共类下载数据{
语句st=null；
连接=空；
String driverName=“com.mysql.jdbc.Driver”；
字符串serverName=“localhost”；
字符串schema=“mandi”；
String url1=“jdbc:mysql://”+serverName+“/”+schema；
字符串username=“root”；
字符串密码=”；
public void DownloadCommodity（）抛出ClassNotFoundException、SQLException{
int j=0；
字符串htmlTableText=null；
System.setProperty（“webdriver.chrome.driver”，“C:\\Users\\SHAKTI\\Desktop\\JarFiles\\chromedriver\u win32\\chromedriver.exe”）；
WebDriver驱动程序=新的ChromeDriver（）；
字符串商品=“Jo”；
字符串commo[]={“稻谷”、“大米”、“Jwar”、“大麦”、“玉米”
};
用于（字符串com:commo）{
字符串sDate=“27/03/2014”；
字符串url=”http://www.upmandiparishad.in/commodityWiseAll.aspx";
获取（url）；
新选择（driver.findElement（By.id（“ctl00\u ContentPlaceHolder1\u ddl\u商品”）））。选择ByVisibleText（com）；
driver.findElement（By.id（“ctl00\u ContentPlaceHolder1\u txt\u rate”））.sendKeys（sDate）；
driver.findElement（By.id（“ctl00\u ContentPlaceHolder1\u btn\u show”）。单击（）；
WebElement findElement=driver.findElement（By.id（“ctl00\u ContentPlaceHolder1\u GridView1”）；
htmlTableText=findElement.getText（）；
//字符串html=find.getText（）；
//现在做你想做的，这是原始表值。
htmlTableText=htmlTableText.replace（“S.No.DistrictMarketPrice”，”）；
htmlTableText=htmlTableText.replaceAll（\\s（\\d+\\s[A-Z]），“\n$1”）；
htmlTableText=htmlTableText.replaceAll（（？=（.*？[]）{4，}）。*？[\n\r]，“”）；
htmlTableText=htmlTableText.replace（“S.No.District Market Price”，”）；
System.out.println（htmlTableText）；
字符串s[]=htmlTableText.split（“”）；
StringTokenizer str=新的StringTokenizer（htmlTableText）；
connection=DriverManager.getConnection（url1、用户名、密码）；
while（str.hasMoreTokens（））//对于（int i=0；i请尝试以下代码：
我刚刚初始化了外的连接，而循环
public class DownLoadData {
Statement st = null;
Connection connection = null;
String driverName = "com.mysql.jdbc.Driver";
String serverName = "localhost";
String schema = "mandi";
String url1 = "jdbc:mysql://" + serverName + "/" + schema;
String username = "root";
String password = "";
public void DownloadCommodity() throws ClassNotFoundException, SQLException {
int j = 0;
String htmlTableText = null;
System.setProperty("webdriver.chrome.driver", "C:\\Users\\SHAKTI\\Desktop\\JarFiles\\chromedriver_win32\\chromedriver.exe");
WebDriver driver = new ChromeDriver();
String commodity = "Jo";
String commo[] = {"Paddy", "Rice", "Jwar", "Barley", "Corn"
};
for (String com : commo) {
String sDate = "27/03/2014";
String url = "http://www.upmandiparishad.in/commodityWiseAll.aspx";
driver.get(url);
new Select(driver.findElement(By.id("ctl00_ContentPlaceHolder1_ddl_commodity"))).selectByVisibleText(com);
driver.findElement(By.id("ctl00_ContentPlaceHolder1_txt_rate")).sendKeys(sDate);
driver.findElement(By.id("ctl00_ContentPlaceHolder1_btn_show")).click();
WebElement findElement = driver.findElement(By.id("ctl00_ContentPlaceHolder1_GridView1"));
htmlTableText = findElement.getText();
// String html=find.getText();
// do whatever you want now, This is raw table values.
htmlTableText = htmlTableText.replace("S.No.DistrictMarketPrice", "");
htmlTableText = htmlTableText.replaceAll("\\s(\\d+\\s[A-Z])", "\n$1");
htmlTableText = htmlTableText.replaceAll("(?=(.*?[ ]){4,}).*?[\n\r]", "");
htmlTableText = htmlTableText.replace("S.No. District Market Price", "");
System.out.println(htmlTableText);
String s[] = htmlTableText.split("");
StringTokenizer str = new StringTokenizer(htmlTableText);
connection = DriverManager.getConnection(url1, username, password);
while (str.hasMoreTokens()) // for(int i=0;i<s.length;i++)
// if(str.hasMoreElements())
{
String no = str.nextElement().toString();
String city = str.nextElement().toString();
String mandi = str.nextElement().toString();
String price = str.nextElement().toString();
Class.forName(driverName);
PreparedStatement ps = connection.prepareStatement("insert into commoditydemo values(?,?,?,?,?,?)");
ps.setString(1, no);
ps.setString(2, city);
ps.setString(3, mandi);
ps.setString(4, price);
ps.setString(5, com);
ps.setString(6, "0");
j = ps.executeUpdate();
connection.close();
}
}
driver.close();
driver.quit();
if (j == 1) {
System.out.println("data inserted");
} else {
System.out.println("not inserted");
}
}
公共类下载数据{
语句st=null；
连接=空；
String driverName=“com.mysql.jdbc.Driver”；
字符串serverName=“localhost”；
字符串schema=“mandi”；
String url1=“jdbc:mysql://”+serverName+“/”+schema；
字符串username=“root”；
字符串密码=”；
public void DownloadCommodity（）抛出ClassNotFoundException、SQLException{
int j=0；
字符串htmlTableText=null；
System.setProperty（“webdriver.c