JavaWeb_(Struts2框架)参数传递之接收参数与传递参数

　　此系列博文基于同一个项目已上传至github　　传送门

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一、接收参数

　　第一种方法

　　【常用】1、继承implements ModelDriven<User>

public class UserAction extends ActionSupport implements ModelDriven<User>{

　　　　　　2、创建一个对象，不要加get()和set()方法

public User user = new User();

　　　　　　3、实现getModel()方法

    @Override
    public User getModel() {
        // TODO Auto-generated method stub
        return user;
    }

package com.Gary.web;

import org.apache.struts2.ServletActionContext;

import com.Gary.domain.User;
import com.Gary.service.UserService;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class UserAction extends ActionSupport implements ModelDriven<User>{

    public User user = new User();

    public String login() throws Exception {

        System.out.println("login()方法");
        System.out.println(user.getUsername());
        UserService userService = new UserService();
        boolean success = userService.findUser(user);
        if(success)
        {
            return "success";
        }else{
            ServletActionContext.getRequest().setAttribute("error", "用户名或密码错误！！！");
            return "error";
        }

    }

    //注册
    public String register() throws Exception {

        System.err.println("register()方法");

        return null;
    }

    //kill方法
    public String kill() throws Exception {

        System.err.println("kill()方法");

        return null;
    }

    @Override
    public User getModel() {
        // TODO Auto-generated method stub
        return user;
    }
}

UserAction.java

　　第二种方法

　　1、添加属性驱动

//添加属性驱动
    public String username;
    public String password;

    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;
    }

package com.Gary.web;

import org.apache.struts2.ServletActionContext;

import com.Gary.domain.User;
import com.Gary.service.UserService;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class UserAction extends ActionSupport{

    //public User user = new User();

    //添加属性驱动
    public String username;
    public String password;

    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;
    }

    public String login() throws Exception {

        System.out.println("login()方法");
        System.out.println(username+":"+ password);

        User user = new User();
        user.setUsername(username);
        user.setPassword(password);

        UserService userService = new UserService();
        boolean success = userService.findUser(user);
        if(success)
        {
            return "success";
        }else{
            ServletActionContext.getRequest().setAttribute("error", "用户名或密码错误！！！");
            return "error";
        }

    }

    //注册
    public String register() throws Exception {

        System.err.println("register()方法");

        return null;
    }

    //kill方法
    public String kill() throws Exception {

        System.err.println("kill()方法");

        return null;
    }

}

UserAction.java

　　第三种方法

　　在login.jsp中修改登陆和注册标签框

                <label for="username" class="username_label"> 用 户 名 <input maxlength="20" name="user.username" type="text" placeholder="您的用户名和登录名" />
                </label>

                <label for="username" class="other_label"> 设 置 密 码 <input maxlength="20" type="password" name="user.password" placeholder="建议至少使用两种字符组合" />
                </label>

　　UserAction.java中直接通过user.getUsername()和user.setUsername()直接得到前台获取到的值

public User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String login() throws Exception {

        System.out.println("login()方法");
        System.out.println(user.getUsername()+":"+ user.getPassword());

        UserService userService = new UserService();
        boolean success = userService.findUser(user);
        if(success)
        {
            return "success";
        }else{
            ServletActionContext.getRequest().setAttribute("error", "用户名或密码错误！！！");
            return "error";
        }

    }

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>

<head>
<meta charset="UTF-8">

<link rel="stylesheet" href="css/head.css" />
<link rel="stylesheet" type="text/css" href="css/login.css" />
</head>

<body>
    <div class="dvhead">
        <div class="dvlogo">
            <a href="index.html">你问我答</a>
        </div>
        <div class="dvsearch">10秒钟注册账号，找到你的同学</div>
        <div class="dvreg">
            已有账号，立即&nbsp;<a href="login.html">登录</a>
        </div>
    </div>
    <section class="sec">
        <form action="${pageContext.request.contextPath }/LoginAction_login" method="post">
            <div class="register-box">
                <label for="username" class="username_label"> 用 户 名 <input maxlength="20" name="user.username" type="text" placeholder="您的用户名和登录名" />
                </label>
                <div class="tips"></div>
            </div>
            <div class="register-box">
                <label for="username" class="other_label"> 设 置 密 码 <input maxlength="20" type="password" name="user.password" placeholder="建议至少使用两种字符组合" />
                </label>
                <div class="tips"></div>
            </div>
            <div class="arguement">
                <input type="checkbox" id="xieyi" /> 阅读并同意 <a href="javascript:void(0)">《你问我答用户注册协议》</a> <a href="register.html">没有账号,立即注册</a>
                <div class="tips" style="color: red">${error}</div>
            </div>
            <div class="submit_btn">
                <button type="submit" id="submit_btn">立 即 登录</button>
            </div>
        </form>
    </section>
    <script src="js/index.js" type="text/javascript" charset="utf-8"></script>
</body>

login.jsp

package com.Gary.web;

import org.apache.struts2.ServletActionContext;

import com.Gary.domain.User;
import com.Gary.service.UserService;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class UserAction extends ActionSupport{

    public User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String login() throws Exception {

        System.out.println("login()方法");
        System.out.println(user.getUsername()+":"+ user.getPassword());

        UserService userService = new UserService();
        boolean success = userService.findUser(user);
        if(success)
        {
            return "success";
        }else{
            ServletActionContext.getRequest().setAttribute("error", "用户名或密码错误！！！");
            return "error";
        }

    }

    //注册
    public String register() throws Exception {

        System.err.println("register()方法");

        return null;
    }

    //kill方法
    public String kill() throws Exception {

        System.err.println("kill()方法");

        return null;
    }

}

UserAction.java

二、传递参数

　　在ImplAction.java中通过login()方法添加<key,value>到session域和application域中

    public String login() throws Exception
    {
        //得到原生的request域
        //ServletActionContext.getRequest().setAttribute("username", "123");
        //ServletActionContext.getRequest().setAttribute("password", "123");

        ActionContext.getContext().put("username", "123");
        ActionContext.getContext().put("password", "123");

        //获得session
        Map<String,Object> session = ActionContext.getContext().getSession();
        session.put("mysession", "这是session域");
        //获得application
        Map<String,Object> application = ActionContext.getContext().getApplication();
        application.put("myapplication", "这是application域");

        //获得原生的request
        HttpServletRequest request = ServletActionContext.getRequest();

        //获得原生的response
        HttpServletResponse response = ServletActionContext.getResponse();

        return "toLogin";
    }

　　struts.xml中动态方法配置了action，将web层ImplAction中的login()转发到com.Gary.web.UserAction中的login()方法

<action name="LoginAction_*" class="com.Gary.web.UserAction" method="{1}">
            <!-- 默认为转发  redirect设置为重定向  -->
            <result name="success" type="redirect">/index.html</result>
            <!-- 默认为转发 -->
            <result name="error">/login.jsp</result>
        </action>

<action name="LoginActionImpl_*" class="com.Gary.web.ImplAction" method="{1}">
            <!-- 转发到LoginActionDefault -->
            <result name="defaultAction" type="chain">LoginActionDefault</result>
            <!-- 重定向到Action(LoginAction_*) -->
            <result name="toLogin" type="redirectAction">
                <param name="actionName">LoginAction_login</param>

                <param name="username">${username}</param>
                <param name="password">${password}</param>
            </result>
        </action>

　　在UserAction.java中输出放置在session域和application域中的内容

    public String login() throws Exception {

        System.out.println("login()方法");
        System.out.println(user.getUsername()+":"+user.getPassword());

        System.out.println("session域..."+ActionContext.getContext().getSession().get("mysession"));
        System.out.println("application域..."+ActionContext.getContext().getApplication().get("myapplication"));

        UserService userService = new UserService();
        boolean success = userService.findUser(user);

        if(success)
        {
            return "success";
        }else{
            ServletActionContext.getRequest().setAttribute("error", "用户名或密码错误！！！");
            return "error";
        }

    }

package com.Gary.web;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;

public class ImplAction implements Action{

    @Override
    public String execute() throws Exception {
        System.out.println("这是实现了Action接口的action");
        return "defaultAction";
    }

    public String login() throws Exception
    {
        //得到原生的request域
        //ServletActionContext.getRequest().setAttribute("username", "123");
        //ServletActionContext.getRequest().setAttribute("password", "123");

        ActionContext.getContext().put("username", "123");
        ActionContext.getContext().put("password", "123");

        //获得session
        Map<String,Object> session = ActionContext.getContext().getSession();
        session.put("mysession", "这是session域");
        //获得application
        Map<String,Object> application = ActionContext.getContext().getApplication();
        application.put("myapplication", "这是application域");

        //获得原生的request
        HttpServletRequest request = ServletActionContext.getRequest();

        //获得原生的response
        HttpServletResponse response = ServletActionContext.getResponse();

        return "toLogin";
    }

}

ImplAction.java

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
    "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>

    <constant name="struts.devMode" value="true"></constant>
    <constant name="struts.enable.DynamicMethodInvocation" value="true"></constant>

    <!-- name:配置包名 namespace:给action的访问路径定义一个命名空间 -->
    <package name="MyPackage" namespace="/" extends="struts-default">
        <!-- 增加动态方法调用的安全性 -->
        <global-allowed-methods>regex:.*</global-allowed-methods>

        <!-- action:配置action类
            name：决定了action访问的资源名称  servlet:url-pattern
            class:action的完整类名
            method:指定调用action中的哪个方法来去处理请求  -->

        <action name="LoginAction_*" class="com.Gary.web.UserAction" method="{1}">
            <!-- 默认为转发  redirect设置为重定向  -->
            <result name="success" type="redirect">/index.html</result>
            <!-- 默认为转发 -->
            <result name="error">/login.jsp</result>
        </action>

        <action name="LoginActionDefault" class="com.Gary.web.DefaultAction" method="execute">

        </action>

        <action name="LoginActionImpl_*" class="com.Gary.web.ImplAction" method="{1}">
            <!-- 转发到LoginActionDefault -->
            <result name="defaultAction" type="chain">LoginActionDefault</result>
            <!-- 重定向到Action(LoginAction_*) -->
            <result name="toLogin" type="redirectAction">
                <param name="actionName">LoginAction_login</param>

                <param name="username">${username}</param>
                <param name="password">${password}</param>
            </result>
        </action>
    </package>
</struts>

struts.xml

package com.Gary.web;

import org.apache.struts2.ServletActionContext;

import com.Gary.domain.User;
import com.Gary.service.UserService;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class UserAction extends ActionSupport implements ModelDriven<User>{

    public User user = new User();

    public String login() throws Exception {

        System.out.println("login()方法");
        System.out.println(user.getUsername()+":"+user.getPassword());

        System.out.println("session域..."+ActionContext.getContext().getSession().get("mysession"));
        System.out.println("application域..."+ActionContext.getContext().getApplication().get("myapplication"));

        UserService userService = new UserService();
        boolean success = userService.findUser(user);

        if(success)
        {
            return "success";
        }else{
            ServletActionContext.getRequest().setAttribute("error", "用户名或密码错误！！！");
            return "error";
        }

    }

    //注册
    public String register() throws Exception {

        System.err.println("register()方法");

        return null;
    }

    //kill方法
    public String kill() throws Exception {

        System.err.println("kill()方法");

        return null;
    }

    @Override
    public User getModel() {
        // TODO Auto-generated method stub
        return user;
    }
}

UserAction.java