Struts2框架连接mysql数据库

数据库连接是一个项目非常重要，不可缺少的一环。在学习了Struts框架之后，将数据库也专门研究了一下。

首先我们需要在数据库中建一张表用来存储我们的数据，这里就以用户登录注册为例

1.建表

 

 设置好它的每一项属性值，并要勾选“自动递增”，否则不能向数据库中写入多条记录。

 2.建立连接_Dbutil.java

package com.mysql.util;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
 
 
public class Dbutil {
	private final String DBURL ="jdbc:mysql://localhost:3306/db";
	private final String DBUSER = "root";
	private final String DBPASSWORD = "123456";
	private Connection con = null;
	private PreparedStatement stmt = null;
	private ResultSet rs = null;
	
	public Dbutil(){
		try {
			Class.forName("com.mysql.jdbc.Driver");
			con = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	public void close(){
		if(con!=null){
			try {
				con.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if(stmt!=null){
			try {
				stmt.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if(rs!=null){
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
	public ResultSet executeQuery(String sql,Object... params) {//可变参数
		try {
			stmt = con.prepareStatement(sql);
			for (int i = 0; i < params.length; i++) {
				this.stmt.setObject(i+1, params[i]);
			}
			rs = stmt.executeQuery();
		} catch (SQLException e1) {
			e1.printStackTrace();
		}
		return rs;
	}
	public int executeUpdate(String sql,Object... params){
		int result = 0;
		try {
			stmt = con.prepareStatement(sql);
			for (int i = 0; i < params.length; i++) {
				this.stmt.setObject(i+1, params[i]);
			}
			result = stmt.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return result;
	}
}

3.书写类_Person.java

package com.mysql.pojo;
 
public class Person {
	private String name;
	private String password;
	private String email;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
}

4.为对象书写方法

1）登录action_LoginAction.java

package com.mysql.action;
 
import java.sql.ResultSet;
 
import com.mysql.pojo.Person;
import com.mysql.util.Dbutil;
import com.opensymphony.xwork2.ActionSupport;
 
public class LoginAction extends ActionSupport{
	private Person persona = new Person();
 
	public Person getPersona() {
		return persona;
	}
 
	public void setPersona(Person persona) {
		this.persona = persona;
	}
 
	@Override
	public String execute() throws Exception {
		Dbutil dButil = new Dbutil();
		ResultSet rs = null;
		String sql = "select * from person p where p.name=? and p.password=?";
		rs = dButil.executeQuery(sql, persona.getName(),persona.getPassword());
		if(rs.next()){
			dButil.close();
			return SUCCESS;
		}else{
			dButil.close();
			return ERROR;
		}
	}
}

2）注册action_RegisterAction.java

package com.mysql.action;
 
import com.mysql.pojo.Person;
import com.mysql.util.Dbutil;
import com.opensymphony.xwork2.ActionSupport;
 
public class RegisterAction extends ActionSupport{
	private Person persona = new Person();
 
	public Person getPersona() {
		return persona;
	}
 
	public void setPersona(Person persona) {
		this.persona = persona;
	}
 
	@Override
	public String execute() throws Exception {
		Dbutil dbutil = new Dbutil();
		String sql="insert into person(name,password,email) values(?,?,?)";
		int executeUpdate = dbutil.executeUpdate(sql,persona.getName(),persona.getPassword(),persona.getEmail());
		if(executeUpdate==1){
			dbutil.close();
			return SUCCESS;
		}else {
			dbutil.close();
			return ERROR;
		}
	}
}

5.输入界面

1）登录界面_login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 


  
    
    
    
    
	
	
	    
	
	
 
  

  
    
    
    
    
    ">注册

  

2）注册界面_register.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 


  
    
    
    
    
	
	
	    
	
	
	
 
  
  
  
  
    
    
    
    
    
  

6.返回界面

1）登录成功_success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>


  
    
    
    
    
	
	
	    
	
	
	
 
  
  
Welcome
  

   
  

2）登录失败_error.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 


  
    
    
    
    
	
	
	    
	
	
	
 
  
  
  
    error!
  

6.Struts.xml

	
		
		/login.jsp
		/error.jsp
		
		
		/success.jsp
		/error.jsp
		
	

7.web.xml

	
	
		struts2
		org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
	
	
	
		struts2
		/*
	

#运行结果