struts2做了个简单的登录注册，jdbc链接数据库

这个登录注册做了能有3天吧，遇到了几个问题，耽误了些时间。现在把问题记下来，防止以后忘掉。也希望对大家有所帮助吧。代码如下：

struts.xml

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
    <package name="my" extends="struts-default" namespace="/" >
        <action name="LoginAction" class="com.struts.action.LoginAction">
            <result name="login">/result.jsp</result>
            <result name="regist">/result.jsp</result>
        </action>
    </package>
</struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4"  xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.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>
</web-app>

<%@ page language="java" contentType="text/html; charset=GB2312" pageEncoding="GB2312" %>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<s:form action="LoginAction" method="post" namespace="/" >
    <s:label value="登录"></s:label>
    <s:textfield name="userName" label="请输入用户名"></s:textfield>
    <s:password name="password" label="请输入密码"></s:password>
    <s:submit value="登录" align="left" method="login"></s:submit>
    <s:submit value="注册" align="left" method="regist"></s:submit>
</s:form>
</body>
</html>

result.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>
    <title>提交结果</title>
  </head>
  <body>
    <h1>${result}</h1>
  </body>
</html>

LoginAction.java

package com.struts.action;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.interceptor.ServletRequestAware;
import com.opensymphony.xwork2.ActionSupport;
import com.struts.service.LoginService;

@SuppressWarnings("serial")
public class LoginAction extends ActionSupport implements ServletRequestAware {

	// 用户名
	private String userName;

	// 用户密码
	private String password;

	// Service
	private LoginService service = new LoginService();

	// 获得HttpServletRequest对象
	private javax.servlet.http.HttpServletRequest request;

	public void setServletRequest(HttpServletRequest request) {
		this.request = request;
	}

	/**
	 * 登录
	 * @return
	 */
	public String login() throws Exception {

		// 登录用户check
		boolean flg = service.userLogin(userName, password);

		if (flg) {

			request.setAttribute("result", "成功保存[" + "登录成功" + "]");

			return "login";
		}
		
		request.setAttribute("result", "成功保存[" + "登录失败" + "]");

		return "login";
	}
	
	/**
	 * 注册
	 * @return
	 */
	public String regist() throws Exception {
		
		// 用户注册
		boolean flg = service.userRegist(userName, password);

		if (flg) {

			request.setAttribute("result", "成功保存[" + "注册成功" + "]");

			return "regist";
		}

		request.setAttribute("result", "成功保存[" + "注册失败" + "]");

		return "regist";

	}

	public String getUserName() {
		return userName;
	}

	public void setUserName(String userName) {
		this.userName = userName;
	}
	
	public String getPassword() {
		return password;
	
	}

	public void setPassword(String password) {
		this.password = password;
	}

}

LoginService.java

package com.struts.service;

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

public class LoginService {

	Connection con = null;

	Statement stat = null;

	ResultSet rs = null;

	public LoginService() {

		try {
			
			Class.forName("com.mysql.jdbc.Driver");
		
			con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","");
		
			stat = con.createStatement();

		} catch (Exception e) {

			con = null;
		
		}
	}

	/**
	 * 登录用户check
	 * 
	 * @param userName
	 * @param passWord
	 */
	public boolean userLogin(String userName, String passWord) {

		String sql = "select * from tb_user where username='" + userName+"' and password ='"+passWord+"'";

		try {

			rs = executeQuery(sql);

			if (rs.next()) {

				return true;
			}

		} catch (SQLException e) {

			e.printStackTrace();
		}
		return false;
	}
	
	/**
	 * 数据库查询
	 * 
	 * @param userName
	 * @param passWord
	 */
	public ResultSet executeQuery(String sql) {

		try {

			rs = stat.executeQuery(sql);
		
		} catch (Exception e) {

			rs = null;
		
		}
		
		return rs;
	}
	
	public boolean userRegist(String userName, String passWord) {

		String sql = "insert into tb_user(username,password) values('"+userName+"','"+passWord+"')";

		try {

			stat.executeUpdate(sql);

			return true;
		
		} catch (Exception e) {
			e.printStackTrace();
		}
	
		return false;
	}
	
	
}

大致能跑的，就是跑数据库的时候有点问题，没那么多时间去研究了～
其实一直困扰的我的问题就是一个form里面有多个submit按钮时要怎么跳转到同一个action里面的不同的方法。

网上这种例子有很多，但大多数都实现不了。后来不经意看到一个论坛上一个帖子的一个神回复。于是试了一下果然成功了。
主要就是在struts.xml中加一句话，在上述代码中已经写出来了

就是这句话。
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
value必须是true，否则就不能动态的分配了。

就总结到这里了。希望大家相互指正，相互学习～

struts2做了个简单的登录注册，jdbc链接数据库

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