java 错误: 未报告的异常错误Exception; 必须对其进行捕获或声明以便抛出

 import java.io.FileInputStream;
 import java.util.Properties;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.Statement;

 public class ExecuteDML{
     private String driver;
     private String url;
     private String user;
     private String pass;

     public void initParam(String paramFile) throws Exception{
         Properties props = new Properties();
         props.load(new FileInputStream(paramFile));
         driver = props.getProperty("driver");
         url = props.getProperty("url");
         user = props.getProperty("user");
         pass = props.getProperty("pass");
     }

     public int insertData(String sql) throws Exception{
         //加载驱动
         Class.forName(driver);
         try(
             //获取数据库连接
             Connection conn = DriverManager.getConnection(url, user, pass);
             //使用Connection来创建一个Statement对象
             Statement stmt = conn.createStatement()){
                 //执行SQL语句，返回受影响的记录条数
                 return stmt.executeUpdate(sql);
             }
     }

     public static void main(String[] args) {
         ExecuteDML ed = new ExecuteDML();
         ed.initParam("mysql.ini");
         int result = ed.insertData("insert into jdbc_test(jdbc_name,jdbc_desc)"
             + "select s.student_name , t.teacher_name "
             + "from student_table s , teacher_table t "
             + "where s.java_teacher = t.teacher_id;");
         System.out.println("------系统中一共有" + result + "条记录受影响------");
     }
 }

出错是因为，对initParam()方法和insertData()方法抛出的异常没有进行处理，解决办法：

　　1.main()方法中在try...catch块中调用initParam()和insertData()方法

　　2.main()方法throws抛出异常。

 import java.io.FileInputStream;
 import java.util.Properties;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.Statement;

 public class ExecuteDML{
     private String driver;
     private String url;
     private String user;
     private String pass;

     public void initParam(String paramFile) throws Exception{
         Properties props = new Properties();
         props.load(new FileInputStream(paramFile));
         driver = props.getProperty("driver");
         url = props.getProperty("url");
         user = props.getProperty("user");
         pass = props.getProperty("pass");
     }

     public int insertData(String sql) throws Exception{
         //加载驱动
         Class.forName(driver);
         try(
             //获取数据库连接
             Connection conn = DriverManager.getConnection(url, user, pass);
             //使用Connection来创建一个Statement对象
             Statement stmt = conn.createStatement()){
                 //执行SQL语句，返回受影响的记录条数
                 return stmt.executeUpdate(sql);
             }
     }

     public static void main(String[] args) throws Exception{
         ExecuteDML ed = new ExecuteDML();
         ed.initParam("mysql.ini");
         int result = ed.insertData("insert into jdbc_test(jdbc_name,jdbc_desc)"
             + "select s.student_name , t.teacher_name "
             + "from student_table s , teacher_table t "
             + "where s.java_teacher = t.teacher_id;");
         System.out.println("------系统中一共有" + result + "条记录受影响------");
     }
 }