問題補(bǔ)充：

加載錯(cuò)誤！

失敗

JAVA.SQL.SQLEXCEPTION: NO SUITABLE DRIVER FOUND FOR JDBC:SQLSERVER://LOCALHOST:1433;DATABASENAME=SYETEMZG

AT JAVA.SQL.DRIVERMANAGER.GETCONNECTION(DRIVERMANAGER.JAVA:602)

AT JAVA.SQL.DRIVERMANAGER.GETCONNECTION(DRIVERMANAGER.JAVA:185)

AT SYSTEMZG.DBCONN.CONN(DBCONN.JAVA:31)

AT SYSTEMZG.TEST.MAIN(TEST.JAVA:14)

Exception in thread "main" java.lang.NullPointerException

at systemZG.Test.main(Test.java:17)

代碼一：

public class DBconn {

// private UserBean userBean;

protected Statement stmt;

protected ResultSet rs;

protected Connection conn;

public Connection conn() {

String driverClassName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";

String url = "jdbc:sqlserver://localhost:1433;databaseName=SyetemZG";

String password = "123456";

String user1 = "wu12";

conn = null;

try {

Class.forName(driverClassName);

} catch (ClassNotFoundException ex) {

System.out.println("加載錯(cuò)誤！");

}

try {

conn = DriverManager.getConnection(url, user1, password);

stmt=conn.createStatement();

System.out.println("成功");

} catch (SQLException ex1) {

System.out.println("失敗");

StringWriter sw = new StringWriter();

PrintWriter pw = new PrintWriter(sw);

ex1.printStackTrace(pw);

System.out.println(sw.toString().toUpperCase());

}

return conn;

}

代碼二：

package systemZG;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

public class Test {

public static void main(String[] args) {

DBconn con=new DBconn();

Statement stmt=null;

Connection conn = con.conn();

ResultSet rs=null;

try {

stmt=conn.createStatement();

rs=stmt.executeQuery("SELECT * FROM 職工基本信息 order by name");

} catch (SQLException e1) {

e1.printStackTrace();

}

try {

while(rs.next()) {

/*System.out.printf(rs.getString(1));

System.out.printf(rs.getString(2));

System.out.printf(rs.getString(3));

System.out.print(rs.getString(4));

System.out.printf(rs.getString(5)+"\n");

//System.out.printf(rs.getString(6));

*/}

} catch (SQLException e) {

e.printStackTrace();

}

try {

rs.close();

stmt.close();

conn.close();

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

總結(jié)

以上是生活随笔為你收集整理的java中什么是空指针异常_java中空指针异常的问题，是怎么回事?请看代码的全部?jī)?nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。