Struts1中通过DispatchAction实现数的运算
添加支持(即jar包)后的步骤为：
(1)创建ActionForm
YunsuanForm.java
package com.mstf.struts.form;
import org.apache.struts.action.ActionForm;
public class YunsuanForm extends ActionForm {
int num1;
int num2;
public int getNum1() {
return num1;
}
public void setNum1(int num1) {
this.num1 = num1;
}
public int getNum2() {
return num2;
}
public void setNum2(int num2) {
this.num2 = num2;
}
}
(2)创建控制器
YunsuanAction.java
package com.mstf.struts;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import com.mstf.struts.form.YunsuanForm;
public class YunsuanAction extends DispatchAction {
public ActionForward dojia(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response){
YunsuanForm ysf=(YunsuanForm)form;
int num1=ysf.getNum1();
int num2=ysf.getNum2();
int result=num1+num2;
request.getSession().setAttribute("result", result);
return mapping.findForward("result");
}
public ActionForward dojian(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response){
YunsuanForm ysf=(YunsuanForm)form;
int num1=ysf.getNum1();
int num2=ysf.getNum2();
int result=num1-num2;
request.getSession().setAttribute("result", result);
return mapping.findForward("result");
}
public ActionForward docheng(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response){
YunsuanForm ysf=(YunsuanForm)form;
int num1=ysf.getNum1();
int num2=ysf.getNum2();
int result=num1*num2;
request.getSession().setAttribute("result", result);
return mapping.findForward("result");
}
public ActionForward dochu(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response){
YunsuanForm ysf=(YunsuanForm)form;
int num1=ysf.getNum1();
int num2=ysf.getNum2();
int result=num1/num2;
request.getSession().setAttribute("result", result);
return mapping.findForward("result");
}
}
(3)创建视图
index.jsp
<body>
<form action="yunsuan.do" method="post">
<input type="hidden" name="method"/>
<table border="1">
<tr>
<th colspan="2" align="center">数的运算</th>
</tr>
<tr>
<th>第一个数：</th>
<td><input type="text" name="num1"/></td>
</tr>
<tr>
<th>第二个数：</th>
<td><input type="text" name="num2"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="+" onclick="method.value='dojia'"/>
<input type="submit" value="-" onclick="method.value='dojian'"/>
<input type="submit" value="*" onclick="method.value='docheng'"/>
<input type="submit" value="/" onclick="method.value='dochu'"/>
</td>
</tr>
</table>
</form>
</body>
result.jsp
<body>
<b>
第一个数为：${YunsuanForm.num1}<br/>
第二个数为：${YunsuanForm.num2}<br/>
结果为：${result}<br/>
</b>
</body>
(4)配置Struts1应用程序
<struts-config>
<data-sources />
<form-beans>
<form-bean name="YunsuanForm" type="com.mstf.struts.form.YunsuanForm">
</form-bean>
</form-beans>
<global-exceptions />
<global-forwards />
<action-mappings >
<action name="YunsuanForm" path="/yunsuan" scope="session" type="com.mstf.struts.YunsuanAction" parameter="method">
<forward name="result" path="/result.jsp"></forward>
</action>
</action-mappings>
<message-resources parameter="com.mstf.struts.ApplicationResources" />
</struts-config>
(5)发布、运行示例
总结：DispatchAction是Action的子类，它能够在同一Action类中完成一组相关的业务操作。创建Dispatch类时，无须覆盖execute()方法，而是创建实现实际业务操作的方法，这些方法都应该和execute()方法具有相同的方法签名，即它们的参数和返回类型都对应相同。
DispatchAction类的配置与普通的Action类相似，需要在配置时指定parameter属性。