应付期末考的struts框架学习

使用前提和简单代码

导入框架Jar文件

在web.xml插入语句

  
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>
            org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
        </filter-class> 
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

在源包下创建struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="default" namespace="/" extends="struts-default">
        <!--name设置id 后面对应的类为action类-->
        <action name="hello" class="action.HelloAction">
            <result name="hello">/hello.jsp</result>
        </action>
    </package>
</struts>

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package action;

/**
 *
 * @author 郑佳杰
 */
public class HelloAction {
    public String execute(){
        return "hello";
//对应<result name="hello">/hello.jsp</result>
//跳转到hello.jsp
    }
}

简单案例实现两数和

主界面

<%-- 
    Document   : input
    Created on : 2021-3-31, 12:12:13
    Author     : 郑佳杰
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>提交页面</title>
    </head>
    <body>
        <form action="add" method="post">
            请输入两个数:
            <br>
            加数:<input name="x"/>
            <br>
            被加数<input name="y"/>
            <br>
            <input type="submit" value="求和">
        </form>
    </body>
</html>

正数和负数的界面

<%-- 
    Document   : Positive
    Created on : 2021-3-31, 12:16:49
    Author     : 郑佳杰
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>结果为正数</title>
    </head>
    <body>
        结果为正数:<s:property value="sum"/>
    </body>
</html>

<%-- 
    Document   : negative
    Created on : 2021-3-31, 12:20:25
    Author     : 郑佳杰
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>结果为负数</title>
    </head>
    <body>
        结果为负数:<s:property value="sum"/>
    </body>
</html>

Action(最关键的地方)

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package action;

/**
 *
 * @author 郑佳杰
 */
public class SumAction {
    private int x;
    private int y;
    private int sum;
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public void setY(int y) {
        this.y = y;
    }
    public int getY() {
        return y;
    }
    public int getSum() {
        return sum;
    }
    public String execute(){
        sum=x+y;
        if(sum>=0) return "+";
        else return "-";
    }
}

配置Xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="default" namespace="/" extends="struts-default">
        <action name="hello" class="action.HelloAction">
            <result name="hello">/hello.jsp</result>
        </action>
        <!--add对应表单的action名字-->
        <action name="add" class="action.SumAction">
            <result name="+">Positive.jsp</result>
            <result name="-">Negative.jsp</result>
        </action>
    </package>
</struts>