struts2入门

最新推荐文章于 2022-03-27 02:32:39 发布

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struts入门

struts环境搭建

struts的配置是在我们昨天把maven的环境全部配置好的前提下在maven项目中的pom.xml加入我们struts的依赖，加载jar包

	<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
			<version>2.5.13</version>
		</dependency>

然后将下面三个xml导入项目内
在这里插入图片描述
再在我们的web.xml中配置好，就可以了，

 <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>

struts动态调用方法

先写好的我们的控制器HelloAction,在里面写两个测试方法,

public class HelloAction implements ModelDriven<Cal>,ServletRequestAware {
	public String add() {
		System.out.println("调用add方法.......");
		return "rs";
	}
	
	
	public String del() {
		System.out.println("调用del方法.......");
		return "rs";
	}

}

然后在struts-sy.xml文件中配置

<?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>
	<!-- /user/bookAction?methoName=list 
		/sy/bookAction?methoName=list 
		降低重复概率
	-->
	<package name="sy" extends="base" namespace="/sy">
		<action name="/demo_*" class="com.li.web.HelloAction" method="{1}">
			<result name="rs">/rs.jsp</result>
			
		</action>
		
	
	</package>
</struts>

最后把jsp页面写出来测试一下

<%@ 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>动态方法调用</h3>
<a href="${pageContext.request.contextPath }/sy/demo_add.action">新增</a>
<a href="${pageContext.request.contextPath }/sy/demo_del.action">删除</a>

</body>
</html>

每次点击控制台都打印了相对应的方法，所以说功能实现了

struts前台和后台参数的传递

我们准备一个实体类Cal，存放参数

package com.li.entity;

public class Cal {

	private String num1;
	private String num2;
	public String getNum1() {
		return num1;
	}
	public void setNum1(String num1) {
		this.num1 = num1;
	}
	public String getNum2() {
		return num2;
	}
	public void setNum2(String num2) {
		this.num2 = num2;
	}
	@Override
	public String toString() {
		return "Cal [num1=" + num1 + ", num2=" + num2 + "]";
	}
	
	
}

struts的前台传参数到后台
1、实现modelDriven接口
2、通过实体类的set/get方法
3、类实例.属性传值

demo1.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>动态方法调用</h3>
<a href="${pageContext.request.contextPath }/sy/demo_add.action">新增</a>
<a href="${pageContext.request.contextPath }/sy/demo_del.action">删除</a>
<h3>后台接收jsp传递参数的三种方式</h3>
<a href="${pageContext.request.contextPath }/sy/demo_accept1.action?num1=20&&num2=5">accept1</a>
<a href="${pageContext.request.contextPath }/sy/demo_accept2.action?cal2.num1=20&&cal2.num2=5">accept2</a>
<a href="${pageContext.request.contextPath }/sy/demo_accept3.action?sex=nv">accept3</a>

</body>
</html>

在后台控制器接收值打印到控制台

HelloAction.java


package com.li.web;

import java.util.Map;

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

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;

import com.li.entity.Cal;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class HelloAction implements ModelDriven<Cal>,ServletRequestAware,ServletResponseAware{
	//注入耦合
	private HttpServletRequest req;
	private HttpServletResponse resp;
	private Cal cal1 = new Cal();
	private Cal cal2;
	private String sex;
	private String num1;
	
	public Cal getCal2() {
		return cal2;
	}
	public void setCal2(Cal cal2) {
		this.cal2 = cal2;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	
	
	public String add() {
		System.out.println("调用add方法~~~~~~~");
		return "rs";
	}
	public String del() {
		System.out.println("调用del方法~~~~~~~");
		return "rs";
	}
	
	
	
	/**
	 * implements modelDrivern 接收参数
	 * @return
	 */
	public String accept1() {
		System.out.println("cal1"+cal1);
		System.out.println("num1:"+num1);
//		req.setAttribute("cal1", cal1);
		//非注入耦合
		HttpServletRequest request = ServletActionContext.getRequest();
		request.setAttribute("cal1", cal1);
		
		
//		非注入解耦
		ActionContext context = ActionContext.getContext();
//		context.get("xxxx");
		
		return "rs";
	}
	/**
	 * 类实例.属性名  接受参数值
	 * @return
	 */
	public String accept2() {
		System.out.println("cal2"+cal2);
		return "rs";
	}
	/**
	 * set/get  接受参数值
	 * @return
	 */
	public String accept3() {
		System.out.println("sex"+sex);
		return "rs";
	}
	
	
	@Override
	public Cal getModel() {
		return cal1;
	}
	@Override
	public void setServletResponse(HttpServletResponse resp) {
		this.resp = resp;
	}
	@Override
	public void setServletRequest(HttpServletRequest req) {
		this.req = req;
	}
}

最后都在控制台打印出了接收的值
在这里插入图片描述

后台传值到jsp界面

1、req.setAtrribute(“key”,“val”);
一是注入的，直接实现ServletRequestAware接口，通过req存放
二是非注入的，在方法中通过ServletActionContext.getRequest()，实例req来存放
2、set/get定义的属性是可以接受到的

上面的HelloAction.java已经写好了

通过,rs.jsp测试一下

<%@ 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>
结果页:${sex }
<br>
${cal1 }
${cal2 }
</body>
</html>

在这里插入图片描述