Struts2自动装配（+入门）

Struts2  入门

实现 的具体步骤：

1.加载类库

2.配置web.xml

3.开发视图层页面

4.开发控制层Action

5.配置struts.xml文件

6.部署运行项目

1.

 "http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

         Y2_SSH
         cn.happy
         1.0-SNAPSHOT

     4.0.0
     Struts2Base
     war
     Struts2Base Maven Webapp
     http://maven.apache.org


             junit
             junit
             3.8.1
             test


             org.apache.struts
             struts2-core
             2.3.4.1


             org.apache.struts.xwork
             xwork-core
             2.3.4.1





             org.apache.taglibs
             taglibs-standard-spec
             1.2.1



             org.apache.taglibs
             taglibs-standard-impl
             1.2.1




             javax.servlet.jsp.jstl
             jstl-api
             1.2


             javaee
             javaee-api
             5





                 src/main/java

                     **/*.*

2.

 "1.0" encoding="UTF-8"?>
 "http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">


     struts2
     class>
       org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
     class>


     struts2
     /*



     contextConfigLocation
     classpath:struts.xml


     class>org.springframework.web.context.ContextLoaderListenerclass>


     helloworld.jsp

3.

 <%@ taglib prefix="s" uri="/struts-tags" %>
 <%--
   Created by IntelliJ IDEA.
   User: linlin
   Date: 2017/10/22
   Time: 9:22
   To change this template use File | Settings | File Templates.
 --%>
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>


     登录


 "UserAction" method="post">
     "name" >
     "pwd" >
     "提交"/>

成功的页面：

 <%--
   Created by IntelliJ IDEA.
   User: linlin
   Date: 2017/10/22
   Time: 9:22
   To change this template use File | Settings | File Templates.
 --%>
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>


     Success


 登录成功！！！

4.控制层

 package cn.happy.struts02;

 import com.opensymphony.xwork2.Action;

 /**
  * Created by linlin on 2017/10/22.
  */
 public class UserAction implements Action {
     private String name;
     private String pwd;
     public String execute() throws Exception {

         if(name.equals("admin")&&pwd.equals("1")){
             return SUCCESS;
         }
        return ERROR;
     }

     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.action

 "1.0" encoding="UTF-8"?>

         "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
         "http://struts.apache.org/dtds/struts-2.0.dtd">

     <package name="default" namespace="/" extends="struts-default">

         "he" class="cn.happy.struts01.HelloWorld">
             "helloworld">/helloworld.jsp


         "UserAction" class="cn.happy.struts02.UserAction">
             "success">/success.jsp
             "error">/index.jsp

     package>

然后进行部署项目  tomcat  然后 启动  

在 浏览器 输入 login页面  进行一系列 表单提交 等  。。。

2.自动装配：

web.xml一样的

struts.xml  没变

类有2个：

 package cn.happy.struts02;

 /**
  * Created by linlin on 2017/10/22.
  */
 public class UserInfo {
     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;
     }
 }

 package cn.happy.struts02;

 import com.opensymphony.xwork2.Action;
 import com.opensymphony.xwork2.ModelDriven;

 /**
  * Created by linlin on 2017/10/22.
  */
 public class UserAction implements Action,ModelDriven {
     private UserInfo user=new UserInfo();

     public String execute() throws Exception {

         if(user.getName().equals("admin")&&user.getPwd().equals("1")){
             return SUCCESS;
         }
        return INPUT;
     }

     public UserInfo getUser() {
         return user;
     }

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

     public UserInfo getModel() {
         return user;
     }
 }

页面

 <%@ taglib prefix="s" uri="/struts-tags" %>
 <%--
   Created by IntelliJ IDEA.
   User: linlin
   Date: 2017/10/22
   Time: 9:22
   To change this template use File | Settings | File Templates.
 --%>
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>


     登录


 "UserAction" method="post">
     "user.name" >
     "user.pwd" >
     "提交"/>

3.耦合 解耦方法：

 package cn.happy.Struts03;

 import com.opensymphony.xwork2.Action;
 import com.opensymphony.xwork2.ActionContext;
 import com.opensymphony.xwork2.util.ValueStack;
 import org.apache.struts2.ServletActionContext;
 import org.apache.struts2.interceptor.ServletRequestAware;
 import org.apache.struts2.util.ServletContextAware;

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

 /**
  * Created by linlin on 2017/10/22.
  */
 public class LoginAction implements Action ,ServletRequestAware,ServletContextAware{
     private HttpServletRequest request;
     private ServletContext servletContext;
     public String execute() throws Exception {
         System.out.println("==============");
        //  HttpSession session=request.getSession();

      //   HttpSession session = ServletActionContext.getRequest().getSession();
            // session.setAttribute("username","张三");

        ActionContext context = ActionContext.getContext();
         Map map = context.getSession();
         map.put("uname","hhh99");
 //
       /*  HttpServletRequest request = ServletActionContext.getRequest();
         ValueStack vs= (ValueStack)request.getAttribute("struts.valueStack");
         vs.push(map);*/

         //放入值栈
 /*        ValueStack valueStack = ActionContext.getContext().getValueStack();
         valueStack.push(map);*/

         //servlet  Context
         ServletContext servletContext = ServletActionContext.getServletContext();
        // session.setAttribute("unsame","admin");
         servletContext.setAttribute("userna","Servlet Context 00000000");

             return SUCCESS;

     }

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

     public HttpServletRequest getRequest() {
         return request;
     }

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

     public void setServletContext(ServletContext servletContext111) {
         this.servletContext = servletContext111;
     }
 }

页面：

 <%@ taglib prefix="s" uri="/struts-tags" %>
 <%--
   Created by IntelliJ IDEA.
   User: linlin
   Date: 2017/10/22
   Time: 9:22
   To change this template use File | Settings | File Templates.
 --%>
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>


     Success


 登录
 "#session.username">
 "#session.uname">
 "uname">
 "#session.userna">