struts 配置过程 -一个计算器程序

来源：互联网发布：周末父母知乎编辑：程序博客网时间：2024/06/05 22:45

1、新建一个java web项目

2、引入jar包、jar包路径：struts-1.2.9-bin\lib

3、配置web.xml文件

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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
     
 <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
  </servlet>
 
 
  <!-- Standard Action Servlet Mapping -->
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.action</url-pattern>
  </servlet-mapping>
</web-app>

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<url-pattern>*.action</url-pattern>  是拦截前台配置信息。<br><br>

　4、配置struts-config.xml文件

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<?xml version="1.0" encoding="ISO-8859-1" ?>
 
<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
 
<struts-config>
 
    <form-beans>
        <form-bean name="calForma" type="com.bjpowrnode.struts.CalActionForm"/>
    </form-beans>
     
    <action-mappings>
        <action path="/cala"
                type="com.bjpowrnode.struts.CalAction"
                name="calForma"
                scope="request"
         >
             <forward name="success" path="/success.jsp"/>
             <forward name="error" path="/error.jsp"/>
         </action>
    </action-mappings>
     
</struts-config>

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<form-bean name="calForma" type="com.bjpowrnode.struts.CalActionForm"/>  其中的name“calForm”是给文件中的数据起了个别名，在下面用（ name="calForma"）<br>通过forward放回的页面中，也中通过这里的 name="calForma"来取值的。

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type="com.bjpowrnode.struts.CalAction"  数据的来源

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scope="request" 数据提交的方式  默认是session存储。<br><br>input.jsp 页面 ：显示计算机页面

<%@ page language="java" contentType="text/html; charset=GB18030"    pageEncoding="GB18030"%><!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=GB18030"><title>Insert title here</title></head><body>    <h>简易计算机</h>    <hr>    <form action="cala.action" method="post">        <input type="text" name="value1"><br>        <select name="flag">            <option value="+">+</option>            <option value="-">-</option>            <option value="*">*</option>            <option value="/">/</option>        </select>                <input type="text" name="value2">        <input type="submit" value="计算">    </form></body></html>

CalActionForm类：相对于实体

package com.bjpowrnode.struts;import org.apache.struts.action.ActionForm;@SuppressWarnings("serial")public class CalActionForm extends ActionForm {    private int value1;    private String flag;    private int value2;        public int getValue1() {        return value1;    }    public void setValue1(int value1) {        this.value1 = value1;    }    public String getFlag() {        return flag;    }    public void setFlag(String flag) {        this.flag = flag;    }    public int getValue2() {        return value2;    }    public void setValue2(int value2) {        this.value2 = value2;    }        }

CalAction类：处理业务逻辑

package com.bjpowrnode.struts;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;import org.apache.struts.action.ActionForm;import org.apache.struts.action.ActionForward;import org.apache.struts.action.ActionMapping;public class CalAction extends Action {    @Override    public ActionForward execute(ActionMapping mapping, ActionForm form,            HttpServletRequest request, HttpServletResponse response)            throws Exception {        CalActionForm calForm = (CalActionForm)form;        int value1 = calForm.getValue1();        String flag = calForm.getFlag();        int value2 = calForm.getValue2();                int result=0;        try{            if("+".equals(flag)){                result = value1+value2;            }else if("-".equals(flag)){                result = value1-value2;            }else if("*".equals(flag)){                result = value1*value2;            }else if("/".equals(flag)){                result = value1/value2;            }                        //把result 放进request 中方便el表达式取值            request.setAttribute("result", result);            return mapping.findForward("success");        }catch(Exception e){            e.printStackTrace();        }                return mapping.findForward("error");        }}

其中的 mapping.findForward("success"); 也就是为struts-config.xml提供转向页面的依据。

success.jsp 页面：计算成功显示数据

<%@ page language="java" contentType="text/html; charset=GB18030"    pageEncoding="GB18030"%><!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=GB18030"><title>Insert title here</title></head><body>   ${calForma.value1}   ${calForma.flag}   ${calForma.value2}   =   ${result}</body></html>

用到了EL表达式。

error.jsp页面：计算失败

<%@ page language="java" contentType="text/html; charset=GB18030"    pageEncoding="GB18030"%><!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=GB18030"><title>Insert title here</title></head><body>      ${calForm.value1}       ${calForm.flag}       ${calForm.value2}      失败！</body></html>

页面整体效果图：

总结：经常用到的知识，不要因为简单都不总结。用非常短的时间坐下总结，以后在用到的时候有据可依！

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