struts2一些小细节(2)

1.校验数据

 action中：

public String add() {
        if(name == null || !name.equals("admin")) {
            this.addFieldError("name", "name is error");
            this.addFieldError("name", "name is too long");
            return ERROR;
        } 
        return SUCCESS;
    }

 jsp中：<%@taglib uri="/struts-tags" prefix="s" %>

<body>
    User Add Error!
    <s:fielderror fieldName="name" theme="simple"/>
</body>

2.debuge模式

<body>
    User Add Error!
    <s:fielderror fieldName="name" theme="simple"/>
    <br />
    <s:property value="errors.name[0]"/>
    <s:debug></s:debug>
</body>

3.取得Map类型request,session,application,真实类型 HttpServletRequest, HttpSession, ServletContext的引用:

 

在action中取得MAP类型的request,session,application(方法一)：

package com.bjsxt.struts2.user.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction1 extends ActionSupport {
    
    private Map request;
    private Map session;
    private Map application;
    
    public LoginAction1() {
        request = (Map)ActionContext.getContext().get("request");
        session = ActionContext.getContext().getSession();
        application = ActionContext.getContext().getApplication();
    }
    
    public String execute() {
        request.put("r1", "r1");
        session.put("s1", "s1");
        application.put("a1", "a1");
        return SUCCESS; 
    }
    
    
}

  在action中取得MAP类型的request,session,application(方法二：实现了以下接口：RequestAware,SessionAware, ApplicationAware )

  该方法运用了IOC原理，建议用此种方法:

package com.bjsxt.struts2.user.action;

import java.util.Map;

import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware, ApplicationAware {
    
    private Map<String, Object> request;
    private Map<String, Object> session;
    private Map<String, Object> application;
    
    //DI dependency injection
    //IoC inverse of control
    public String execute() {
        request.put("r1", "r1");
        session.put("s1", "s1");
        application.put("a1", "a1");
        return SUCCESS; 
    }

    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;
    }

    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }

    @Override
    public void setApplication(Map<String, Object> application) {
        this.application = application;
    }
    
    
}

 在anction中取得真实类型 HttpServletRequest, HttpSession, ServletContext(方法三)

package com.bjsxt.struts2.user.action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction3 extends ActionSupport {
    
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;
    
    public LoginAction3() {
        request = ServletActionContext.getRequest();
        session = request.getSession();
        application = session.getServletContext();
    }
    
    public String execute() {
        request.setAttribute("r1", "r1");
        session.setAttribute("s1", "s1");
        application.setAttribute("a1", "a1");
        return SUCCESS; 
    }
    
}

 

  在anction中取得真实类型 HttpServletRequest, HttpSession, ServletContext(方法四 运用了IOC 实现了ServletRequestAware接口)

package com.bjsxt.struts2.user.action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction4 extends ActionSupport implements ServletRequestAware {
    
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;
    
    
    
    public String execute() {
        request.setAttribute("r1", "r1");
        session.setAttribute("s1", "s1");
        application.setAttribute("a1", "a1");
        return SUCCESS; 
    }



    @Override
    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
        this.session = request.getSession();
        this.application = session.getServletContext();
    }
    
}

 

在JSP页面中访问request,session,application：

<?xml version="1.0" encoding="GB18030" ?>
<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
    <%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030" />
<title>Insert title here</title>
</head>
<body>
    User Login Success!
    <br />
    <s:property value="#request.r1"/> | <%=request.getAttribute("r1") %> <br />
    <s:property value="#session.s1"/> | <%=session.getAttribute("s1") %> <br />
    <s:property value="#application.a1"/> | <%=application.getAttribute("a1") %> <br />
    <s:property value="#attr.a1"/><br />
    <s:property value="#attr.s1"/><br />
    <s:property value="#attr.r1"/><br />
    <s:debug></s:debug>
    <br />
</body>
</html>

 

posted @ 2016-04-25 10:47  进进  阅读(85)  评论(0)    收藏  举报