Struts2初步接触

使用idea快速搭建Struts2的Maven项目

首先使用intelij idea部署Maven项目

1.jar包引入 pom.xml

我们用的是阿里云

我用的是最新版的Struts2核心jar包和最新版的xwork jar包

只需引入这两个节点

     <dependency>
          <groupId>org.apache.struts</groupId>
          <artifactId>struts2-core</artifactId>
          <version>2.5.8</version>
        </dependency>

        <dependency>
          <groupId>org.apache.struts.xwork</groupId>
          <artifactId>xwork-core</artifactId>
          <version>2.3.8</version>
        </dependency>

2.接下来书写web.xml

直接上全部代码

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.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>

3.然后就是jsp页面的书写了（View视图书写），我用了两个页面，一个登陆页面，一个登陆成功页面

这是登陆页面，附加说明。我引入了javaee的jar包，不然

<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
这会报错的。还有一种解决办法，就是在服务器引入Servletjar包

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page isELIgnored="false"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>登录</title>
    <h1>登录</h1>
    <s:form action="LoginAction" namespace="/" method="POST">
        <s:textfield name="users.name"></s:textfield><s:fielderror fieldName="ename"></s:fielderror><br/>
        <s:textfield name="users.pwd"></s:textfield><s:fielderror fieldName="epwd"></s:fielderror><br/>
        <s:submit value="登录"></s:submit>
    </s:form>
<s:debug></s:debug>
</head>

<body>
</body>
</html>
这是成功页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page isELIgnored="false"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>成功</title>
</head>
<body>
<h1>登录成功欢迎${name}您的密码是${pwd}</h1>
</body>
</html>

4.书写我们的Action

package cn.curry.entity;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.SessionAware;

import javax.servlet.http.HttpSession;
import java.util.Map;


/**
 * Created by Curry on 2017/2/27.
 */
public class LoginAction extends ActionSupport {//还可以实现 Action
    private Users users;//实体po
    private Map<String,Object> map;
    //效验
    public void validate(){
        if(users.getName().length()==0){
            addFieldError("ename","用户名不为空");
        }
        if(users.getPwd().length()==0){
            addFieldError("epwd","密码不为空");
        }

    }
    //使用Servlet API去向Session中放入数据
    public String execute() throws Exception {
        if (users.getName().equals("admin")&&users.getPwd().equals("1")){
            //解耦
            Map<String, Object> session = ActionContext.getContext().getSession();
            session.put("name",users.getName());
            session.put("pwd",users.getPwd());
            //解耦2
            /*map.put("name",users.getName());
            map.put("pwd",users.getPwd());*/
            //耦合
            /*HttpSession session = ServletActionContext.getRequest().getSession();
            session.setAttribute("name",users.getName());
            session.setAttribute("pwd",users.getPwd());*/
            return SUCCESS;//常亮
        }else{
            return INPUT;
        }
    }

    public Users getUsers() {
        return users;
    }

    public void setUsers(Users users) {
        this.users = users;
    }

    public void setSession(Map<String, Object> session) {
        this.map=session;
    }
}

4.1实体类

package cn.curry.entity;

/**
 * Created by Curry on 2017/2/27.
 */
public class Users {
    private String name;
    private String pwd;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
}
5.在classpath，写一个名称为struts.xml

<?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.enable.DynamicMethodInvocation" value="true"/>
    <constant name="struts.devMode" value="true"/>
    <package name="default" namespace="/" extends="struts-default">
        <action name="LoginAction" class="cn.curry.entity.LoginAction">
            <result name="success">success.jsp</result>
            <result name="login">index.jsp</result>
            <result name="input">index.jsp</result>
        </action>
    </package>
</struts>

6.部署运行，笔者使用的事Tomcat8,jdk事1.8

第一次使用Struts2来写一个小例子，遇到问题也比较多。很多都是jar包问题，再加上idea用的不熟（之前用myeclipse），波折颇多，最后圆满成功。