Struts2入门
作者：互联网
目录
4、子控制器中获得request，response，session对象
①通过类ServletActionContext获得request，response
一、概念
基于MVC设计模式的web框架，Struts2作为控制器Controller来建立模型与视图的数据交互。
在三层架构中属于表示层。
二、入门
1、配置过滤器
创建的为maven项目，所以项目结构如下图
在WebContent下的web.xml中配置Struts2，在自定义mvc阶段配置的是中央控制器，在这里概念
相同，一点小区别是Struts2配置的是过滤器。
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
<display-name>Maven_test</display-name>
<filter>
<filter-name>struts</filter-name>
<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
</web-app>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter是如何得到的？
这个是过滤器的全路径，maven已将帮我们自动下载了Struts2的核心jar包。我们需要在prm.xml中
添加依赖让maven帮我们下载Struts2相关jar包。
<dependency>
<groupId>org.apache.struts</groupId>
<artifactId>struts2-core</artifactId>
<version>2.5.13</version>
</dependency>怎么判断jar包下载成功？在Maven Dependencies下面可以看到maven帮我们从仓库中下载的jar。
2、动态调用方法
TestAction.java
package com.zwf.web;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.zwf.Po.User;
public class TestAction extends ActionSupport implements ModelDriven<User>{
private User u = new User();
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public User getModel() {
return u;
}
public String add() throws Exception {
System.out.println("add()...");
System.out.println(u);
return "bookEdit";
}
public String del() throws Exception {
System.out.println("del()...");
System.out.println(u);
return "bookEdit";
}
public String edit() throws Exception {
System.out.println("edit()...");
System.out.println(u);
return "bookEdit";
}
}
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h3>Struts动态调用方法</h3>
<a href="${ pageContext.request.contextPath }/sy/demo1_add.action">新增</a><br>
<a href="${ pageContext.request.contextPath }/sy/demo1_edit.action">修改</a><br>
<a href="${ pageContext.request.contextPath }/sy/demo1_del.action">删除</a>
</body>
</html>配置文件
struts-base.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.i18n.encoding" value="UTF-8" />
<constant name="struts.devMode" value="true" />
<constant name="struts.configuration.xml.reload" value="true" />
<constant name="struts.i18n.reload" value="true" />
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
<package name="base" extends="struts-default" abstract="true">
<global-allowed-methods>regex:.*</global-allowed-methods>
</package>
</struts>struts-sy.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>
<package name="sy" extends="base" namespace="/sy">
<action name="/demo1_*" class="com.zwf.web.TestAction"
method="{1}">
<result name="bookEdit">/Yes.jsp</result>
</action>
</package>
</struts>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>
<!-- 引入了Struts的默认配置 -->
<include file="struts-default.xml"></include>
<!-- 开发人员对Struts框架的基本配置 -->
<include file="struts-base.xml"></include>
<!-- 项目涉及到的模块，分文件管理 -->
<include file="struts-sy.xml"></include>
</struts>
struts框架只会寻找Struts开头的xml文件，可以看到在Struts.xml中包含了其他两个xml文件。
这就有点类似于分类管理，Struts.xml中有注释！！
注意：之前配置的是mvc.xml文件，现在我们的项目涉及到的模块在Struts-sy.xml中配置，配置写
法发生了一点点改变。demo1_*_*
第一个*代表调用方法；
第二个*代表跳哪个界面（一般使用一个*（ {1}代表第一个*）的写法）；
启动服务测试！
3、传参
三种方式
①实现ModelDriver接口
②get\set
③对象属性
实体类：user.java
package com.zwf.Po;
public class User {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "User [name=" + name + ", age=" + age + "]";
}
}
TestAction.java
package com.zwf.web;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.zwf.Po.User;
public class TestAction extends ActionSupport implements ModelDriven<User>{
/**
* ModelDriver传参测试对象
*/
private User u = new User();
/**
* get\set传参测试属性
*/
private String uname;
/**
* 对象传参测试对象
*/
private User u1;
public User getU1() {
return u1;
}
public void setU1(User u1) {
this.u1 = u1;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
@Override
public User getModel() {
return u;
}
public String add() throws Exception {
System.out.println("ModelDriver:"+u);
System.out.println("set&get:"+uname);
System.out.println("对象:"+u1);
return "bookEdit";
}
public String del() throws Exception {
System.out.println("ModelDriver:"+u);
System.out.println("set&get:"+uname);
System.out.println("对象:"+u1);
return "bookEdit";
}
public String edit() throws Exception {
System.out.println("ModelDriver:"+u);
System.out.println("set&get:"+uname);
System.out.println("对象:"+u1);
return "bookEdit";
}
}
index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h3>Struts传参</h3>
<a href="${ pageContext.request.contextPath }/sy/demo1_add.action?name=zs&age=11">ModelDriver传参数</a><br>
<a href="${ pageContext.request.contextPath }/sy/demo1_edit.action?uname=ls">get\set</a><br>
<a href="${ pageContext.request.contextPath }/sy/demo1_del.action?u1.name=zs&u1.age=12">对象</a>
</body>
</html>从上往下点击一次测试，打印结果
4、子控制器中获得request，response，session对象
①通过类ServletActionContext获得request，response
②实现struts提供的接口
package com.zwf.web;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.zwf.Po.User;
public class TestAction extends ActionSupport implements ModelDriven<User>, ServletRequestAware, ServletResponseAware {
private HttpServletRequest req;
private HttpServletResponse resp;
@Override
public void setServletResponse(HttpServletResponse response) {
this.resp = response;
}
@Override
public void setServletRequest(HttpServletRequest request) {
this.req = request;
}
public String add() throws Exception {
req.setAttribute("test", "测试成功");
return "bookEdit";
}
}
测试结果如下图：
三、疑问
通过阅读上文可以知道传参有三种方式，如果get\set方式传参的参数名和ModelDriver驱动的实体
类的其中一个属性名相同！！！那么这时候前端传过来的参数到底会赋值给哪一个呢？请看下篇
ognl讲解！
标签：return,String,System,Struts2,println,import,public,入门 来源： https://blog.csdn.net/weixin_49789131/article/details/120728715