一个简单的DispatchAction的应用

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#myeclipse #struts #delete #string #import #html

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博客介绍了Struts框架中DispatchAction的使用，通过input.jsp提供update和delete等按键，根据按键value值执行不同方法。还给出了update.jsp、delete.jsp页面代码，以及DispatchAction、ActionForm和Struts-Config.xml的代码示例，强调DispatchAction通过parameter区分方法。

1. input.jsp: 只是提供两本基本的按键：update和delete，当然用户可以增加其它的按键，然后在Action加入其它值的
public ActionForward otherValue(
            ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response) {       }
比如你加入了一个<html:submit property=“method“ value=“addOrder“/>
那么就要在DispatchAction中加入

public ActionForward addOrder(
            ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response) {
            UserManipulcationForm userManipulcationForm = (UserManipulcationForm) form;
            /*
             * 其它的一些代码
             */
            return mapping.findForward("delete");
        }

input.jsp的代码：<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>

<html>
<body>
  <html:form action="/userManipulcation">
   name : <html:text property="name"/><html:errors property="name"/></br>
   address : <html:text property="address"/><html:errors property="address"/></br>
   <html:submit property="method" value="update"/>
   <html:submit property="method" value="delete"/>
  </html:form>
</body>
</html>

2. update.jsp: 当用户按update键在input.jsp中，最后转到update.jsp

<html>
<body>
This is the Update Page<br>
</body>
</html>

3. delete.jsp: 当用户按delete键在input.jsp中，最后转到delete.jsp

<html>
<body>
This is the Delete Page<br>
</body>
</html>

4. 我的DispatchAction:如下
//Created by MyEclipse Struts
// XSL source (default): platform:/plugin/com.genuitec.eclipse.cross.easystruts.eclipse_3.8.0/xslt/JavaClass.xsl

package com.yourcompany.struts.action;

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.yourcompany.struts.form.UserManipulcationForm;

/**
* MyEclipse Struts
* Creation date: 08-23-2004
*
* XDoclet definition:
* @struts:action path="/userManipulcation" name="userManipulcationForm" input="/form/userManipulcation.jsp" parameter="type" scope="request"
*/
public class UserManipulcationAction extends DispatchAction {

// --------------------------------------------------------- Instance Variables

// --------------------------------------------------------- Methods

    /**
     * Method execute
     * @param mapping
     * @param form
     * @param request
     * @param response
     * @return ActionForward
     */
    public ActionForward update(
        ActionMapping mapping,
        ActionForm form,
        HttpServletRequest request,
        HttpServletResponse response) {
        UserManipulcationForm userManipulcationForm = (UserManipulcationForm) form;
        /*
         * 其它的一些代码对应其按update键
         */
        return mapping.findForward("update");
    }

    public ActionForward delete(
            ActionMapping mapping,
            ActionForm form,
            HttpServletRequest request,
            HttpServletResponse response) {
            UserManipulcationForm userManipulcationForm = (UserManipulcationForm) form;
            /*
             * 其它的一些代码对应其按delete键
             */
            return mapping.findForward("delete");
        }

}

要注意得就是，对就按的键中的value不同，DispatchAction用自动执行其它想对应value的方法。。

其它的：

ActionForm:

//Created by MyEclipse Struts
// XSL source (default): platform:/plugin/com.genuitec.eclipse.cross.easystruts.eclipse_3.8.0/xslt/JavaClass.xsl

package com.yourcompany.struts.form;

import org.apache.struts.action.ActionForm;

/**
* MyEclipse Struts
* Creation date: 08-23-2004
*
* XDoclet definition:
* @struts:form name="userManipulcationForm"
*/
public class UserManipulcationForm extends ActionForm {

// --------------------------------------------------------- Instance Variables

/** address property */
private String address;

    /** name property */
    private String name;

    /** method property */
    private String method;

// --------------------------------------------------------- Methods

    /**
     * Returns the address.
     * @return String
     */
    public String getAddress() {
        return address;
    }

    /**
     * Set the address.
     * @param address The address to set
     */
    public void setAddress(String address) {
        this.address = address;
    }

    /**
     * Returns the name.
     * @return String
     */
    public String getName() {
        return name;
    }

    /**
     * Set the name.
     * @param name The name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    public String getMethod() {
        return method;
    }
    public void setMethod(String method) {
        this.method = method;
    }
}

Struts-Config.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
   <data-sources />
   <form-beans >
      <form-bean name="userManipulcationForm" type="com.yourcompany.struts.form.UserManipulcationForm" />

</form-beans>

   <global-exceptions />
   <global-forwards />
   <action-mappings >
      <action
         attribute="userManipulcationForm"
         input="/form/userManipulcation.jsp"
         name="userManipulcationForm"
         parameter="method"
         path="/userManipulcation"
         scope="request"
         type="com.yourcompany.struts.action.UserManipulcationAction"
         validate="false" >
         <forward name="update" path="/update.jsp" />
         <forward name="delete" path="/delete.jsp" />
      </action>

</action-mappings>

要注意的就是。。
DispatchAction是通过在struts-config.xml中定义的 parameter="method"
来区别不同的method的值执行不同的方法。。。

就<html:submit property=”method” value=”update”/>