Struts2(六)：ResultType

本章节将继续学习struts2的返回类型的使用方法。

学习文档下载struts2 full包解压后会在doc下包含离线html文档。

点击运行后页面：

点击Guides向导终将会有向导列表

再点开后，就可以看到struts2支持的所有resultType:

默认的resultType是dispatcher.

常用的dispatcher,redirect,redirectAction,chain.

package name="default" namespace="/" extends="struts-default">
        <action name="testServletObject"
            class="com.dx.actions.TestActionContextFetchServletObjectAction">
            <result>/WEB-INF/test-context.jsp</result>
        </action>
        <!-- default class="com.opensymphony.xwork2.ActionSupport" method="execute" -->
        <action name="gotoLoginPage">
        <!-- name default value:"success" -->
            <result>/login.jsp</result>
        </action>
                
        <action name="logout" class="com.dx.actions.TestWithXXXAware"
            method="logout">
            <result name="logout-success">/login.jsp</result>
        </action>
        
        <action name="login" class="com.dx.actions.TestWithXXXAware" method="login">
            <result name="login-success">/WEB-INF/login-success.jsp</result>
        </action>
        
        <action name="testResult" class="com.dx.actions.TestResultAction" method="test">
            <!-- redirect到一个Action -->
            <result name="redirectAction-success" type="redirectAction">
                <param name="actionName">testRdirect</param>
                <param name="namespace">/testNamespace</param>
            </result>
            <!-- redirect -->
            <result name="redirect-success" type="redirect">/login.jsp</result>
            <!-- dispatcher -->
            <result name="dispatcher-success" type="dispatcher">/login.jsp</result>
        </action>
        
        <action name="createAccount" class="com.dx.actions.AccountAction" method="execute">
            <!-- chain -->
            <result type="chain">login</result>
        </action>
    </package>
    
    <package name="testRedirectPackage" namespace="/testNamespace" extends="struts-default">
        <action name="testRdirect" class="com.dx.actions.TestRedirectAction" method="test">
            <result name="test-success">/WEB-INF/test-success.jsp</result>
        </action>
    </package>

TestRedirectAction.java

package com.dx.actions;

import org.apache.struts2.ServletActionContext;

public class TestRedirectAction {
    public String test() {
        String resultType = ServletActionContext.getRequest().getParameter("resultType");
        System.out.println(resultType);
        ServletActionContext.getRequest().setAttribute("resultType", resultType);
        System.out.println("TestRedirectAction.test");
        return "test-success";
    }
}

TestResultAction.java

package com.dx.actions;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

import sun.nio.cs.ext.TIS_620;

public class TestResultAction {
    private String resultType;

    public void setResultType(String resultType) {
        this.resultType = resultType;
    }

    public String test() {
        System.out.println(resultType);

        if (resultType.equalsIgnoreCase("dispatcher")) {
            System.out.println("result dispatcher-success");
            return "dispatcher-success";
        } else if (resultType.equalsIgnoreCase("redirect")) {
            System.out.println("result redirect-success");
            return "redirect-success";
        } else if (resultType.equalsIgnoreCase("redirectAction")) {
            System.out.println("result redirectAction-success");
            return "redirectAction-success";
        } else if (resultType.equalsIgnoreCase("chain")) {
            System.out.println("result chain-success");
            return "chain-success";
        } else {
            System.out.println("no match");
        }
        
        ServletActionContext.getRequest().setAttribute("resultType", this.resultType);
        
        return "";
    }
}

AccountAction.java

package com.dx.actions;

public class AccountAction {
    public String execute(){
        System.out.println("acction action chain");
        return "success";
    }
}

index.jsp

<a href="testResult?resultType=redirectAction">redirectAction</a>
    <br />
    <a href="testResult?resultType=redirect">redirect</a>
    <br />
    <a href="testResult?resultType=dispatcher">dispatcher</a>    
    <br />
    <a href="createAccount">test chain</a>
    

result配置还有很多需要注意的地方，可以参考：

file:///D:/Java_Study/struts-2.3.28-all/struts-2.3.28/docs/docs/result-configuration.html

这里就简单说明，介绍，一遍自己可以学习使用。