Java框架之Struts2（二）

//请求的直接转发
<package name="packageUser" namespace="" extends="struts-default">
    <action name="addUser">
    <result>success.jsp</result>
    </action>    
</package>

<action name="addUser" class="com.opensymphony.xwork2.ActionSupport" method="execute" >
<result name="success" >success.jsp</result>
</action>    

<package name="struts-default" abstract="true">
    <result-types>
        <result-type name="chain" class="com.opensymphony.xwork2.ActionChainResult"/>
        <result-type name="dispatcher" class="org.apache.struts2.dispatcher.ServletDispatcherResult" default="true"/>
        <result-type name="freemarker" class="org.apache.struts2.views.freemarker.FreemarkerResult"/>
        <result-type name="httpheader" class="org.apache.struts2.dispatcher.HttpHeaderResult"/>
        <result-type name="redirect" class="org.apache.struts2.dispatcher.ServletRedirectResult"/>
        <result-type name="redirectAction" class="org.apache.struts2.dispatcher.ServletActionRedirectResult"/>
        <result-type name="stream" class="org.apache.struts2.dispatcher.StreamResult"/>
        <result-type name="velocity" class="org.apache.struts2.dispatcher.VelocityResult"/>
        <result-type name="xslt" class="org.apache.struts2.views.xslt.XSLTResult"/>
        <result-type name="plainText" class="org.apache.struts2.dispatcher.PlainTextResult" />
        <result-type name="postback" class="org.apache.struts2.dispatcher.PostbackResult" />
    </result-types>
        .... 
</package>

//例子 使用 redirect方式在 url 后面传值的例子
<package name="packageThree" namespace=""  extends="struts-default">
   <action name="usrEdit" class="cat.action.UserEditAction" method="execute" >
   <result name="success" type="redirect" >/test_redirect.jsp?userName=${userName}</result> 注意,这里的 type 为redirect
   </action>
</package>
                    
//并且,在 UserEditAction 中:
public class UserEditAction {
   private String userName; //要生成get set 方法
   public String execute(){
          try {  
               userName=URLEncoder.encode("这是很久很久没来的高睿","UTF-8");  //为了处理乱码,这里要URLEncoder
              } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
                                    }
               return "success";
}

//在test_redirect.jsp中,可以用 ${userName} 取出来值,但如果有中文将出现乱码，可以如下处理
<% 
    String userName= request.getParameter("userName");
    userName=new String(userName.getBytes("iso8859-1"),"UTF-8");
    // userName=URLDecoder.decode(userName,"UTF-8");  实测不加也可以
        out.println(userName);
%

//例子 重定向到别的action 
<action name="redirectOtherActionTest">
<result type="redirectAction">otherActionName</result>    
</action>
                    
<action name="otherActionName">
<result>success.jsp</result>
</action>

//例子 重定向到别的包中的 action 
<action name="redirectOtherPackageActionTest">
<result type="redirectAction">
<param name="actionName">xxx</param>
<param name="namespace">/two</param>
</result>    
</action>

<global-results>
  <result name="g_error">/error.jsp</result> //这是包范围内的全局视图
</global-results>
         
<action name="userAdd" class="cat.action.UserAction" method="add" >
//这里没有配置 result 
</action>
         
public class UserAction extends ActionSupport {
       public String add(){
       return "g_error";  //全局视图
       }
}

//这个包是专门用来给别的包继承的
     <package name="base" extends="struts-default" >
           <global-results>
               <result name="g_success">/success.jsp</result>
               <result name="g_eror">/error.jsp</result>
           </global-results>
    </package>
   
   <package name="packageUser" namespace="" extends="base">
          <action name="userAdd" class="cat.action.UserAction" method="add" > 
             //如果这里也有一个 <result name="g_eror">/error.jsp</result> ,则会覆盖全局视图
          </action>
   </package>
        
        public class UserAction extends ActionSupport {
            public String add(){
                return "g_success";  //全局视图
                }
      }

public class NumZhuRuAction {
            private String compName;  //公司名称
            private String money;  //公司现金
            
              ...  get set 方法
            
                public String execute(){
                    return "success";
                }
        }

     <package name="packageUser" namespace="" extends="base">
        <action name="numZhuRuAction" class="cat.action.NumZhuRuAction" method="execute">
            <param name="compName">海康公司</param>
            <param name="money">100元</param>
            <result name="success">/zhuru_ok.jsp</result>
        </action>
   </package>

<struts>
   <constant name="struts.action.extension" value="do"/>
</struts>

//为应用指定多个struts 配置文件
                
//在主文件中  <include file="good_conf.xml" />
                 
//新建一个 配置文件,名称为 good_conf.xml
<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
 <package name="package_xxx" extends="base">
  <action name="hellowGoods" >
   <result name="success">/goods_add.jsp</result>
  </action>
 </package>
</struts>

//动态方法调
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
   <action name="userAction" class="cat.action.UserAction" >  
       <result name="add_success">/add_success.jsp</result>
       <result name="del_success">/del_success.jsp</result>
       <result name="update_success">/update_success.jsp</result>
   </action>

//使用通配符的方式
<action name="userActionNew_*" class="cat.action.UserAction" method="{1}">
   <result name="xxx_success">/{1}_success.jsp</result>  // 这里可以写成 {1}.jsp
</action>

Public class HellowAction{
   private integer id; 生成get 和set 方法
//struts用反射技术处理,调用与请求参数同名的属性的seeter方法来获取请求参数值
}

Public class ProductAction{
    private Product prod;
    public void setProd(Product prod){this.prod=prod}
    public Product getProd(){ return this.prod}
} 

public class ParamTestAction {
       private String userName; //为之生成get 和set方法
       private String password;
                
       public String execute() {    
       //if (this.userName.equals("admin") && this.password.equals("123")) { 
       if ("admin".equals(this.userName) && "123".equals(this.password)) {        //注意,这样的技可以避免空指针异常
          return "success";
          } else {
            return "err";
          }
        }
}

<package name="packageSix" namespace="" extends="struts-default"> //注意,放在了默认的命名空间下,访问就不用写上/test了
  <action name="ParamTestAction" class="cat.action.ParamTestAction"    method="execute">
          <result name="success">/ParamSucc.jsp</result>
          <result name="err">/ParamErr.jsp</result>
  </action>
</package>

<body>
  登录成功
  ${userName }
  ${password }  
</body>

<form action="ParamTestAction" method="post">
      <input type="text" name="userName" /> 
      <input type="password"    name="password" />
      <input type="submit" value="提交" >
</form>

public class BeanParamAction {
      private UserInfo userInfo; //生成get和set方法
      public String execute() {
         if ("admin".equals(userInfo.getUserName())    && ("123".equals(userInfo.getPassword()))) {    
         return "success";
         } else {
         return "err";
         }
      }
}

<action name="BeanParamAction" class="cat.action.BeanParamAction"    method="execute">
   <result name="success">/BeanParamSucc.jsp</result>
   <result name="err">/BeanParamErr.jsp</result>
</action>

<body>
  登录成功  采用复合类型接收参数
  ${userInfo.userName}
  ${userInfo.password}
</body>

<form action="BeanParamAction" method="post">
   <input type="text" name="userInfo.userName" />  //注意参数的传法
   <input type="password"    name="userInfo.password" /> //注意参数的传法
   <input type="submit" value="提交" >
</form>

public String execute(){    
       ActionContext ctx=ActionContext.getContext();  //是struts2 提供的
       ctx.getApplication().put("app_key", "全局范围内的值"); //相当于往 ServletContext 中放入
       ctx.getSession().put("session_key", "这是session内的值") ; //相当于往 session中放入
       ctx.put("request_key", "这是request中的值");
                
       //ctx.getSession() 等操作,得到的是 map集合
       return "success";
}

//success.jsp
<body>
  application : ${applicationScope.app_key}
  session:  ${sessionScope.session_key }
   request:  ${requestScope.request_key }
</body>

public String testScope(){
       HttpServletRequest request =  ServletActionContext.getRequest();
       ServletContext application=ServletActionContext.getServletContext();
       HttpSession session=request.getSession();
                        
       request.setAttribute("requestKey", "用request对象设置的request的值");
       session.setAttribute("sessionKey", "用session对象设置的session的值");
       application.setAttribute("appKey", "用application 对象设置的 application的值");

       return "success";
       }
                
      application : ${applicationScope.appKey}  <br>
      session:  ${sessionScope.sessionKey } <br>
      request:  ${requestScope.requestKey } <br>

public class BaseAction  extends ActionSupport implements ServletRequestAware,ServletContextAware,ServletResponseAware {
                        public HttpServletRequest request;
                        public ServletContext  servletContext;
                        public HttpServletResponse response;
                        public HttpSession session;
                        
                        public String execute(){
                            request.setAttribute("hahaha", "哈哈哈,这都是啥子");
                            return "success";     
                        }
                    
                        @Override
                        public void setServletResponse(HttpServletResponse response) {
                            this.response=response; 
                            
                        }
                    
                        @Override
                        public void setServletContext(ServletContext context) {
                            this.servletContext=context;
                        }
                    
                        @Override
                        public void setServletRequest(HttpServletRequest request) {
                            this.request=request;
                            this.session=request.getSession();
                        }    
                    }