10.Struts2连接数据库

链接数据库的两种方式:

1.在Action中连接数据库

2.使用工具类连接数据库

1.在Action中连接数据库

源码文档目录如图所示:

10.Struts2连接数据库


 1.建立数据库

数据库建立语句:

create database aynu;
use aynu;
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `person`
-- ----------------------------
DROP TABLE IF EXISTS `person`;
CREATE TABLE `person` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `gender` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  `city` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of person
-- ----------------------------

10.Struts2连接数据库

2.加载struts2核心jar包和数据库驱动包

struts2核心jar包,加载方法略。

xwork-core-2.1.6.jar: Structs2框架的核心类库
struts2-core-2.1.8.1.jar: XWork类库,Structs2在其上构建
ognl-2.7.3.jar:对象图导航语言(Object Graph Navigation Language),Structs2框架通过其读写对象属性。
freemarker-2.3.15.jar:   Structs2的UI标签的模板使用FreeMarker编写
commons-logging-1.0.4.jar: ASF出品的日志包,Structs2框架使用这个日志包来支持Log4J和JDK1.4+的日志记录。
commons-fileupload-1.2.1.jar: 文件上传组件,2.1.6版本后必须加入此文件。

数据库驱动包:

mysql-connector-java-3.1.12-bin.jar

3.index.jsp源码如下:

<%@ page pageEncoding="utf-8"%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
        <title>register page</title>
  </head>
<body> <form action="register.action" method="post"> 姓名:<input type="text" name="name"/><br/> 性别:<input type="radio" name="gender" value="male" checked="checked"/><input type="radio" name="gender" value="female"/><br/> 年龄:<input type="text" name="age"/><br/> 城市:<input type="text" name="city"/><br/> <input type="submit" value="注册"/> </form> </body> </html>

 4.show.jsp源码如下:

<%@ page pageEncoding="utf-8"%>
<html>
  <head>  
    <title>show page</title>
  </head>  
  <body>
  插入完成!                     
  </body>
</html>

 5.RegisterAction.java源码如下:

package cn.edu.aynu.Stu_con_DataSql.actions;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class RegisterAction {
    private String name;
    private String gender;
    private int age;
    private String city;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    
    public String execute(){
        //将数据插入到数据库
        
        //1.加载数据库驱动
        try {
            String driverName="com.mysql.jdbc.Driver";
            Class.forName(driverName);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        Connection con=null;
        PreparedStatement ps=null;
        try {
            
            //2.数据库链接
            String url="jdbc:mysql://127.0.0.1:3306/aynu";
            String user="root";
            String password="toor";
            con=DriverManager.getConnection(url,user,password);//这里选择import java.sql.Connection;
            
            //插入SQL语句
            String sql="insert into person(name,gender,age,city)values(?,?,?,?)";
            ps=con.prepareStatement(sql);
            
            //插入数据
            ps.setString(1, name);
            ps.setString(2, gender);
            ps.setInt(3, age);
            ps.setString(4,city);
            //执行SQL语句插入命令
            ps.executeUpdate();    
            
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            try {
                ps.close();
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return "success";
    }
}

 6.web.xml配置如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    
        <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
        </filter>

        <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
        </filter-mapping>
    
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

 7.struts.xml配置如下:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <package name="one" extends="struts-default">
    
        <action name="register" class="cn.edu.aynu.Stu_con_DataSql.actions.RegisterAction">
            <result>/show.jsp</result>
        </action>
        
    </package>
    
</struts>

 8.部署发布,启动tomcat,地址输入:

http://127.0.0.1:8080/Stu_con_DataSql/

程序截图如下:

10.Struts2连接数据库


 10.Struts2连接数据库


 数据插入数据库成功!

10.Struts2连接数据库


 2.使用工具类连接数据库

只需要修改上面的RegisterAction.java和新增加一个工具类JdbcUtil.java即可。

10.Struts2连接数据库

RegisterAction.java源码如下:

package cn.edu.aynu.Stu_con_DataSql.actions;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import cn.edu.aynu.Stu_con_DataSql.utils.JdbcUtil;

public class RegisterAction {
    private String name;
    private String gender;
    private int age;
    private String city;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    
    public String execute(){
        //将数据插入到数据库
        
        //1.加载数据库驱动
        Connection con=JdbcUtil.getConnection();
        PreparedStatement ps=null;
        try {
            
            //插入SQL语句
            String sql="insert into person(name,gender,age,city)values(?,?,?,?)";
            ps=con.prepareStatement(sql);
            
            //插入数据
            ps.setString(1, name);
            ps.setString(2, gender);
            ps.setInt(3, age);
            ps.setString(4,city);
            //执行SQL语句插入命令
            ps.executeUpdate();    
            
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            try {
                ps.close();
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return "success";
    }
}

 JdbcUtil.java源码如下:

package cn.edu.aynu.Stu_con_DataSql.utils;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

//数据库工具类
public class JdbcUtil {
    
    //这里引用import java.sql.Connection;
    private static Connection con;
    
    //1.加载数据库驱动
    static{
    
        try {
            String driverName="com.mysql.jdbc.Driver";
            Class.forName(driverName);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        
    }
    
    //2.数据库链接
    public static Connection getConnection(){
        
        String url="jdbc:mysql://127.0.0.1:3306/aynu";
        String user="root";
        String password="toor";
        try {
            con=DriverManager.getConnection(url,user,password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return con;
    }
    
    //3.数据库全部关闭
    public static void close(Connection con,Statement stmt,ResultSet rs){
    //引入java.sql.Satement包,import java.sql.ResultSet,import java.sql.Connection;
        try {
            if(con!=null)con.close();
            if(stmt!=null)stmt.close();
            if(rs!=null)rs.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        }
    //4.数据库选择关闭
    public static void close(Object obj){
        try {
            if(obj instanceof Connection &&obj!=null)((Connection)obj).close();
            if(obj instanceof Statement &&obj!=null)((Statement)obj).close();
            if(obj instanceof ResultSet &&obj!=null)((ResultSet)obj).close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

 重新部署发布,启动tomcat,输入地址:

http://127.0.0.1:8080/Stu_con_DataSql/

 10.Struts2连接数据库

 10.Struts2连接数据库


10.Struts2连接数据库

 

10.Struts2连接数据库

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