学习随心记

Struts标签定义taglib

<%@taglib uri=/struts-tags prefix=s%>

Struts.xml中设置开发模式devmode

Struts.xml中设置默认编码encoding

Struts.xml中导入包含其他模块

Action中标记错误

this.addFieldError(error_name,The Name Is Not Equals To qsuron);
return ERROR;

Struct.xml中设置默认Default Action

Jsp中取出错误信息

result类型

1.dispatcher 服务器端的跳转(URL不变)
2.redirect 客户端的跳转(URL改变，重新请求新的页面)
3.chain 能跳转到action
4.redirectAction 能跳转到action
5.freemaker 一个框架
6.httpheader HTTP头信息
7.stream 上传下载
8.xslt 和XML相关的修饰语言
9.plaintext 返回源码(带<%的，做教程网站的话可能会用到)
10.title 动态更新网页标题

 

 
	
		
        
            /ActionIntroduction.jsp
        
        
            /r1.jsp
        
        
            /r2.jsp
        
        
            r1
        
        
            r2
        
	
    

常见问题，当要chain的其他action位于其他的namespace时，代码如下：

        dashboard/secure
        
    

Action里操作客户端request,session,application-方式1

package com.qsuron.action;

import java.util.Map;

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

public class LoginAction1 extends ActionSupport{
	private static final long serialVersionUID = 1L;
	private Map request;
	private Map session;
	private Map application;

	@SuppressWarnings(unchecked)
	public LoginAction1(){
		request = (Map) ActionContext.getContext().get(request);
		session = ActionContext.getContext().getSession();
		application = ActionContext.getContext().getApplication();
	}
	
	public String login(){
		request.put(r1,request-qsuron);
		session.put(s1,session-qsuron);
		application.put(a1,application-qsuron);
		return SUCCESS;
	}
}

Action里操作客户端request,session,application-方式2-最常用的

package com.qsuron.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;

/**最常用
 * 体现了DI(dependcy injection)或者说是IoC(inverse of control)设计思想
 * 类似于DomainModelParamInput
 */
public class LoginAction2 extends ActionSupport implements RequestAware,SessionAware,ApplicationAware{
	private static final long serialVersionUID = 1L;
	private Map request;
	private Map session;
	private Map application;

	public String login(){
		System.out.println(222);
		request.put(r1,request-qsuron);
		session.put(s1,session-qsuron);
		application.put(a1,application-qsuron);
		return SUCCESS;
	}

	public void setRequest(Map request) {
		this.request = request;
	}

	public void setSession(Map session) {
		this.session = session;
	}

	public void setApplication(Map application) {
		this.application = application;
	}
}

package com.qsuron.action;

import java.util.Map;

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

import org.apache.struts2.ServletActionContext;

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

public class LoginAction3 extends ActionSupport{
	private static final long serialVersionUID = 1L;
	private HttpServletRequest request;
	private HttpSession session;
	private ServletContext application;

	public LoginAction3(){
		request = ServletActionContext.getRequest();
		session = request.getSession();
		application = session.getServletContext();
	}
	
	public String login(){
		System.out.println(333);
		request.setAttribute(r1,request-qsuron);
		session.setAttribute(s1,session-qsuron);
		application.setAttribute(a1,application-qsuron);
		return SUCCESS;
	}
}

package com.qsuron.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 static final long serialVersionUID = 1L;
	private HttpServletRequest request;
	private HttpSession session;
	private ServletContext application;

	public String login(){
		System.out.println(444);
		request.setAttribute(r1,request-qsuron);
		session.setAttribute(s1,session-qsuron);
		application.setAttribute(a1,application-qsuron);
		return SUCCESS;
	}

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


}

客户端使用Struts2或者Jsp语句对action中的request,session,application进行取值

<%=request.getAttribute(r1) %>