Eclipse用户登录案例

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you-get --playlist --format=flv480 -o E:/StuDev/Program/JavaWeb https://www.bilibili.com/video/BV18s411u7EH

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<web-app>
	<display-name></display-name>
	<welcome-file-list>
  		<welcome-file>login.jsp</welcome-file>
	</welcome-file-list>
    <filter>
    	<filter-name>struts2</filter-name>
    	<filter-class>org.apache.</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>

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<struts>
    <!--乱码解决-->
    <constant name="struts.i18n.encoding" value="UTF-8"/>
    <!--自定义扩展名
    <comstant name="struts.action.extension" value="action,,siggy"></comstant>-->
    <!--设置开发模式:提示错误信息-->
    <comstant name="struts.devMode" value="true"></comstant>
    <!--文件修改后自动装载-->
    <comstant name="struts.configuration.xml.reload" value="true"></comstant>
    <!--团队协作开发include-->
    <include file="config/bri/struts/user.xml"/>
	<package name="default" namespace="/" extends="struts-default">
		<action name="login" class="cn.bri.action.loginAction">
			<result>/success.jsp</result>
             <result name="failed">/login.jsp</result>
		</action>
        <action name="add" class="cn.bri.action.loginAction"></action>
	</package>
</struts>

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<!--form action="login.siggy" method="post">-->
<form action="user/login.action" method="post">
      用户名:<input type="text" name="name"/>
      密码:<input type="submit" name="pwd"/>
    <input type="submit" value="登录"/>
</form>

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public class LoginAction {
    private String name;
    private String pwd;
    
	public String execute() {
		if("xingming".equals(name)&&"mima".equals(pwd))
			return "success";
		else{
            return "login"
			//return "failed"
        }
	}
    
    public String logout(){
        sout("退出");
        return "success"
    }
    public String getName(){
        return name;
    }
    public String setName(String name){
        this.name = name;
    }
    public String getPwd(){
        return pwd;
    }
    public String setPwd(String pwd){
        this.pwd = pwd;
    }

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#自定义扩展名
#struts.action.extension=action,,siggy

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<struts>
    <!--
		包名自定义，可以配置多个包
		namespace命名空间：不同模块可以指定不同的空间
		extends值是直接或间接继承struts-default
	-->
    <package name="user" namespace="/user" extends="struts-default">
		<!--当action不存在时，执行默认action，避免难看-->
        <default-action-ref name ="default"/>
		<!--在action中，如果没有class将会执行默认class-->
        <default-class-ref class="cn.bri.action.addAction"/>
		<!--配置全局结果集:使用太多使用-->
        <global-results>
        	<result name="login">/login.jsp</result>
        </global-results>
        <!--
			name是url请求名，不需要加后缀(.action)和/
			class是处理url请求对应的java类，class要求包名加类名，并且该类是由公共的无参构造方法的
			method是配置处理请求类的方法，默认为execute,方法是公共的，返回值类型是String，无参
			method与name无关，一样为了好记
		-->
		<action name="login" class="cn.bri.action.loginAction">
            <!--
				result:指结果集
				name:匹配请求处理方法的返回值，默认是success
				type:结果处理类型，
					1.默认是dispather转发，和servlet一致。如果request中有数据要到视图显示，则使用
					2.redirect重定向:重定向到jsp可以直接重定向；如果到另一个action，需注意是否配置了action的后缀名。如web.xml要求有，则重定向一定要加上后缀名 <url-pattern>*.action</url-pattern>
					3.redirectAction:重定向到另一个action,不用加action后缀名,会讲前一个action后缀名自动加上
					4.stream:以流的形式显示---文件下载
			-->
			<result type="redirect">logout.action</result>
            <!--因为有全局结果集 (loginAction.java return "login")
             <result name="login">/login.jsp</result>-->
		</action>
        <!--在loginAction添加方法logout()-->
        <action name="logout" class="cn.bri.action.loginAction" method="logout">
			<result>/index.jsp</result>
		</action>
        <!--在action中，如果没有class将会执行默认class-->
        <action name="add" class="cn.bri.action.addAction" method="add">
			<result>/index.jsp</result>
		</action>
        <action name="default">
			<result>/error.jsp</result>
		</action>
	</package>
</struts>

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public class AddAction {
    public String add(){
        sout("add")
        return "success";
    }
    public String delete(){
        sout("add")
        return "success";
    }
    public String update(){
        sout("add")
        return "success";
    }
}

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<body>
    资源不存在
</body>

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<body>
    ${name}
</body>

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<struts>
	<package name="hello" namespace="/" extends="struts-default">
		<action name="pojo" class="cn.bri.action.pojoAction">
             <result name="success">/index.jsp</result>
		</action>
        <action name="interface" class="cn.bri.action.interfaceAction">
			<result>/index.jsp</result>
		</action>
		<action name="entends" class="cn.bri.action.extendsAction">
			<result>/index.jsp</result>
		</action>
	</package>
</struts>

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public class PojoAction{
    public String execute(){
        sout("pojo");
        return "success";
    }
}

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//接口为了编写代码规范
public class InterfaceAction implements Action{
    //jdk1.8不用写，有默认
    public String execute() throws Exception{
        sout("InterfaceAction");
        return Action.SUCCESS;//none
    }
}

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//继承什么都不写，就啥输出也没有
public class ExtendsAction entends ActionSupport{
    @Override
    public String execute() throws Exception{
        sout("extendsAction");
        return Action.SUCCESS;
    }
}

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<struts>
	<package name="user" namespace="/" extends="struts-default">
		<action name="register" class="cn.bri.action.UserAction" method="register">
             <result name="success">/show.jsp</result>
		</action>
	</package>
</struts>

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public class User{
    private String name;
    private String pwd;
    private int age;
    private String email;
    
	public String getName(){
        return name;
    }
    public String setName(String name){
        this.name = name;
    }
    public String getPwd(){
        return pwd;
    }
    public String setPwd(String pwd){
        this.pwd = pwd;
    }
    ...
}

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public class UserAction(){
    private User user;
    //注册
    public String register(){
        sout(user);
        return Action.SUCCESS;
    }
    public String getUser(){
        return user;
    }
    public String setUser(User user){
        this.user = user;
    }
    
    //Generate toString()...快捷键
    @Override
    public String toString(){
        return ......
    }
}

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<body>
    <form action="register.action" method="post">
		用户名:<input type="text" name="user.name"/>  <!--user.name-->
		密码:<input type="password" name="user.pwd"/>
		年龄:<input type="text" name="user.age"/>
		邮箱:<input type="text" name="user.email"/>
		<input type="submit" value="提交"/>
    </form>
</body>

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<body>
    ${user}
</body>

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//2   重点implements ModelDriven<User>   new User()  getModel(){return user}
public class UserModelAction implements ModelDriven<User>{//从页面表单返回User类型数据
    private User user=new User();
    public String register(){//从UserAction.java复制过来的
        sout(user);
        return Action.SUCCESS;
    }
    private User getModel(){
        return user;
    }
}

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<!--1  重点 name="name"... -->
<body>
    <form action="regModel.action" method="post">
		用户名:<input type="text" name="name"/>
		密码:<input type="password" name="pwd"/>
		年龄:<input type="text" name="age"/>
		邮箱:<input type="text" name="email"/>
		<input type="submit" value="提交"/>
    </form>
</body>

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<struts>
	<package name="user" namespace="/" extends="struts-default">
		<action name="register" class="cn.bri.action.UserAction" method="register">
             <result name="success">/show.jsp</result>
		</action>
        <action name="regModel" class="cn.bri.action.UserModelAction" method="regModel">
             <result name="success">/show.jsp</result>
		</action>
	</package>
</struts>

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public class User{
    private int id;
    private String name;
    private String pwd;
    
    public User(){
        
    }
    //快捷键Generate Constructor using Fields
    public User(String name,String pwd){//没有id也可以
        super();
        this.name = name;
        this.pwd = pwd;
    }//返回if(rs.next()){
    
    public String getId(){
        return name;
    }
    public String setId(String id){
        this.id = id;
    }
	public String getName(){
        return name;
    }
    public String setName(String name){
        this.name = name;
    }
}

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public class UserDao extends BaseDao{
    public User login(User u){
        String sql="select * from t_user where name=? and pwd=?";
        ResultSet rs = this.executeQuery(sql,u.getName(),u.getPwd());
        try{
            if(rs.next()){//判断是否为空
            //在User.java中生成构造方法public User(){} public User(String name,String pwd){}
            return new User(rs.getInt(1),rs.getString(2),rs.getString(3))//可能有错，try一下
        	}
        } catch (SQLException e){
            e.preintStackTrace();
        }finally{
            this.close();
        }
        return null;
    }
    public List<User> getList(){
        String sql="select * from t_user;
        List<User> list = new ArrayList<User>();
        ResultSet rs = this.executeQuery(sql)
        try{
            while(rs.next()){
            list.add(new User(rs.getInt(1),rs.getString(2),rs.getString(3)))
        	}
        } catch (SQLException e){
            e.preintStackTrace();
        }finally{
            this.close();
        }
        return list.size()>0?list:null;
    }
    //修改
    public int update(User u){
        String sql = "update t_user set name=?,pwd=? where id=?";
        return this.executeQuery(sql,u.getName(),u.getPwd(),u.getId());
    }
    //查找  要更新先查找
    public int getById(int id){
        String sql="select * from t_user where id=?;
        ResultSet rs = this.executeQuery(sql,id);
        try{
            if(rs.next()){
            return new User(rs.getInt(1),rs.getString(2),rs.getString(3))
        	}
        } catch (SQLException e){
            e.preintStackTrace();
        }finally{
            this.close();
        }
        return null;
    }
}

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public class UserService{
    private UserDao userDao = new UserDao;
    public User login(User u){
        return userDao.login(u);
    }
    public List<User> getList(){
        return userDao.getList();
    }
    public User update(User u){
        return userDao.update(u);
    }
    public int getById(int id){
        return userDao.getById(id);
    }
}

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public class UserAction(){
    private User user;
    private List<User> list;
    private UserService userService = new UserService();
    //登录
    public String login(){
        User temp=userService.login(user);
        if(temp!=null){
            //list = userService.getList();不够好，和下面重复,直接list();
            //return list();但是可能拦截器就用不了了
            return Action.SUCCESS;//去struts.xml  添加type="redirectAction"
        }
        return Action.LOGIN;//登录失败
    }
    //获取用户列表在前台显示
    public String list(){//要在前台显示，就要作为属性，并且要生成get方法
        list = userService.getList();
        return Action.SUCCESS;
    }
    //根据id查询用户，然后跳转到update.jsp
    public String toUpdate(){
        user=UserService.getById(user.getId());
        return Action.SUCCESS;
    }
    //更新用户
    public String update(){
        int result=userService.update(user);
        if(result>0){
            return Action.SUCCESS;
        }
        return Action.ERROR;
    }

    public String getUser(){
        return user;
    }
    public String setUser(User user){
        this.user = user;
    }
    public List<User> getList(){
        return list;
    }
    public List<User> setList(List<User> list){
        this.list = list;
    }
}

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<struts>
	<package name="user" extends="struts-default">
		<action name="login" class="cn.action.UserAction" method="login">
             <result name="success" type="redirectAction">list</result>
             <result name="login">/login.jsp</result>
		</action>
        <action name="list" class="cn.action.UserAction" method="list">
             <result name="success">/list.jsp</result>
		</action>
        <action name="toUpdate" class="cn.action.UserAction" method="toUpdate">
             <result>/update.jsp</result>
		</action>
        <action name="update" class="cn.action.UserAction" method="update">
             <result type="redirectAction">list</result>
             <result name="error">/error.jsp</result><!--去写error.jsp-->
		</action>
	</package>
</struts>

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<body>
    <form action="login.action" method="post">
		用户名:<input type="text" name="user.name"/>
		密码:<input type="password" name="user.pwd"/>
		<input type="submit" value="登录"/>
    </form>
</body>

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<%taglib prefix="c" url="...jsp/jstl/core"%>
<body>
    <table width="80%" align="center">
        <tr>
        	<td>编号</td>
            <td>姓名</td>
            <td>密码</td>
            <td>操作</td>
        </tr>
        <c:forEach items="${list }" var="bean">
        <tr>
        	<td>${bean.id }</td>
        	<td>${bean.name }</td>
        	<td>${bean.pwd }</td>
            <!--UserAction.java没有id属性，所以需要userr.id-->
            <td><a href="toUpdate?user.id=${bean.id }">修改</a></td>
        </tr>
        <!--不显示，因为UserAction.java  login()方法没有执行查询list = userService.getList();-->
        </c:forEach>
    </table>
</body>

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<body>
    <form action="update.action" method="post">
	<input type="hidden" name="user.id" value="${user.id}"/>
		用户名:<input type="text" name="user.name" value="${user.name}"/>
		密码:<input type="password" name="user.pwd" value="${user.pwd}"/>
		<input type="submit" value="修改"/><!--去写配置文件-->
    </form>
</body>

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<body>
    修改失败
</body>

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<body>
    <a href="login.jsp">登录</a>
</body>

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public class LoginAction {
    private String name;
    private String pwd;
    
	public String execute() {
		if("xingming".equals(name)&&"mima".equals(pwd))
            //     1推荐
            //1获取session
            //ActionContext.getContext().getSession().put("user",name);
        	////2获取request-----HttpServletRequest对象的attributes
        	//Map<String,Object> request = (MAp)ActionContext.getContext().get("request");
        	//3获取application
       		//Map<String,Object> application = ActionContext.getContext().getApplication();
        	//4获取parameters,并输出试一试是否成功
        	//Map<String,Object> parameters = ActionContext.getContext().getParameters();
        	//相当于request.getParameters("name");
        	//sout("name===="+parameters.get("name"));
            
            //     2 重要
            //HttpServletRequest request=(HttpServletRequest)ActionContext.getContext().get(StrutsStatic.Http_REQUEST);
        	
            //request.getSession().setAttribute("user",name);
            //sout("name===="+request.getParameters("name"));
            
            //     3推荐
            HttpServletRequest request=ServletActionContext.getRequest();
        	request.getSession().setAttribute("user",name);
            sout("name===="+request.getParameters("name"));
        
		   return "success";
		else{
            return "login"
        }
	}
    
    public String logout(){
        //先获取数据，然后清空方法
        ActionContext.getContext().getSession().remove("user");
        sout("退出");
        return "success"
    }
    public String getName(){
        return name;
    }
    public String setName(String name){
        this.name = name;
    }
    public String getPwd(){
        return pwd;
    }
    public String setPwd(String pwd){
        this.pwd = pwd;
    }

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<body>
   用户名： ${user }--------<a href="logout.action">退出</a>
</body>

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<struts>
    <package name="user" namespace="/" extends="struts-default">
		<action name="login" class="cn.bri.action.loginAction">
			<result>/success.jsp</result>
		</action>
        <action name="logout" class="cn.bri.action.loginAction" method="logout">
			<result>/index.jsp</result>
		</action>
        <action name="default">
			<result>/error.jsp</result>
		</action>
	</package>
</struts>

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<body>
    <a href="login.jsp">登录</a>
</body>

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<body>
    <form action="login.action" method="post">
		用户名:<input type="text" name="user.name"/>
		密码:<input type="password" name="user.pwd"/>
		<input type="submit" value="登录"/>
    </form>
</body>

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<struts>
	<package name="default" extends="struts-default">
		<action name="point" class="cn.action.PointAction">
             <result>/index.jsp</result>
		</action>
	</package>
</struts><!--4-->

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public class Point {
    private int x;
    private int y;
    
    public String getX(){
        return x;
    }
    public String setX(String x){
        this.x = x;
    }
	public String getY(){
        return y;
    }
    public String setY(String y){
        this.y = y;
    }
}//1

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public class PointAction {
	private Point point;
    
    public String execute(){
        sout(point.getX()+"--------"+point.getY());
        return Action.SUCCESS;
    }
    
    public String getPoint(){
        return point;
    }
    public String setPoint(String point){
        this.point = point;
    }
}//3

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<body>
    <form action="point.action" method="post">
        x:<input type="text" name="point.x"/><br>
        y:<input type="text" name="point.y"/><br>
        <input type="submit" value="提交"/><br>
    </form>
</body><!--2-->

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<body>
    x:<s:property value="point.x"/><br>
    y:<s:property value="point.y"/><br>
</body><!--5-->

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<body>
    <form action="point.action" method="post">
        点:<input type="text" name="point"/><br>
        <input type="submit" value="提交"/><br>
    </form>
</body>

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public class PointConverter extends StrutsTypeConverter{
    /*
      将表单提交的字符串数据转换为指定的自定义类型
      context是ActionContext数据
      values 要进行类型转换的字符串数组
      toClass 被转换的类型
    */
    @Override
    public Object convertFromString(Map context,String[] values,Class toClass){
        String value=values[0];
        sout(value);
        Point point = new Point();
        String x=value.substring(1,value.indexOf(","))
        String y=value.substring(value.indexOf(",")+1,value.length()-1);
        //测试
        //sout("x="+x);
        //sout("y="+y);value.length()-1
        point.setX(Interger.parseInt(x));
        point.setY(Interger.parseInt(y));
        return null;
    }
    //将自定义类型转换为字符串在前台显示，通过ognl表达式将会使用该方法转换，o为被转换数据
    @Override
    public String convertToString(Map context,Object o){
        //1:点:<s:property value="point"/>
        Point point = (Point)o;
        return "("+point.getX()+","+point.getY()+")";
        //2:return null;无返回值，不显示数据
    }
}

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cn.entity.Point=cn.converter.PointConverter

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<body>
    x:<s:property value="point.x"/><br>
    y:<s:property value="point.y"/><br>
    点：${point }<!--写toString方法-->
</body>

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public class PointAction {
	private Point point;
    
    public String execute(){
        sout(point.getX()+"--------"+point.getY());
        return Action.SUCCESS;
    }
    
    public String getPoint(){
        return point;
    }
    public String setPoint(String point){
        this.point = point;
    }
    @Override
    public String toString(){
        return "(" + x + ",y=" + y + ")";
    }
}

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public class RegisterAction entends ActionSupport{
    private String name;
    private String pwd;
    private int age ;
    private Date birthday;
    
    @Override
	public String execute() throws Exception{
        return Action.SUCCESS;
    }
    
    @Override
	public String validete(){
        super.validete();
    }
    //get(){}
    //set(){}
}

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public class RegisterAction entends ActionSupport{
    private String name;
    private String pwd;
    private int age ;
    private Date birthday;
    
    @Override
	public String execute() throws Exception{
        sout("execute");
        return Action.SUCCESS;
    }
    
    //get(){}
    //set(){}
}

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<body>
<s:actiomerror/>
<s:fielderror></s:fielderror>
    <form action="register.action" method="post">
        用户名：<input type="text" name="name"/><br>
        密码：<input type="text" name="pwd"/><br>
        年龄：<input type="text" name="age"/><br>
        生日：<input type="text" name="birthday"/><br>
        <input type="submit" value="登录"/><br>
    </form>
</body>

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<validators>
	<field name="name"></field><!--验证谁就写谁名-->
    <field-validator type="requiredstring">
        <param name="trim">true</param>
        <message>用户名必填</message>
    </field-validator>
</validators>

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<struts>
	<package name="default" namespace="/" extends="struts-default">
		<action name="register" class="cn.action.RegisterValidateAction">
             <result>/index.jsp</result>
             <result name="input">/register.jsp</result>
		</action>
	</package>
</struts>