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Struts2 Web 资源获取一个有四种方式，两个大类
第一种：实现ServletRequestAware、ServletResponseAware、ServletContextAware接口
struts.xml
<action name="FirstAction" class="Action.FirstAction">
<result name="success">/success.jsp</result>
</action>index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<h2>用户登陆</h2>
<form action="FirstAction.action" method="post">
<ul>
<li>姓名:<input type="text" name="username"></li>
<li>密码:<input type="text" name="password"></li>
<li><input type="submit" value="提交"></li>
</ul>
</form>
</body>
</html>FirstAction.java
package Action;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.util.ServletContextAware;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Created with IntelliJ IDEA.
* User: YEN
* Date: 2016/8/2
* Time: 19:31
*/
public class FirstAction extends ActionSupport implements ServletRequestAware,ServletResponseAware,ServletContextAware{
private ServletRequest request;
private ServletResponse response;
private ServletContext context;
@Override
public void setServletRequest(HttpServletRequest httpServletRequest) {
request=httpServletRequest;
}
@Override
public void setServletResponse(HttpServletResponse httpServletResponse) {response=httpServletResponse;}
@Override
public void setServletContext(ServletContext servletContext) { context=servletContext; }
@Override
public String execute() throws Exception {
//验证表单数据是否提交过来了
String username=request.getParameter("username");
String password=request.getParameter("password");
System.out.println("第一种方式:"+username+"........"+password);
return SUCCESS;
}
}
第二种方式：实现RequestAware接口
struts.xml
<action name="SecondAction" class="Action.SecondAction">
<result name="success">/success.jsp</result>
</action>index.jsp
<form action="SecondAction.action" method="post">package Action;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.StrutsStatics;
import org.apache.struts2.interceptor.RequestAware;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.util.Map;
/**
* Created with IntelliJ IDEA.
* User: YEN
* Date: 2016/8/2
* Time: 19:42
*/
/**
* 使用RequestAware拦截器
*/
public class SecondAction extends ActionSupport implements RequestAware {
private ServletRequest request;
private ServletResponse response;
private ServletContext context;
@Override
public void setRequest(Map<String, Object> map) {
request=(ServletRequest)map.get(StrutsStatics.HTTP_REQUEST);
response=(ServletResponse)map.get(StrutsStatics.HTTP_RESPONSE);
context=(ServletContext)map.get(StrutsStatics.SERVLET_CONTEXT);
}
@Override
public String execute() throws Exception {
System.out.println("第二种方式："+request.getParameter("username")+"..............."+request.getParameter("password"));
return SUCCESS;
}
}
第三种方式：静态对象获取方式1
struts.xml
<action name="ThirdAction" class="Action.ThirdAction">
<result name="success">/success.jsp</result>
</action>index.jsp
<form action="ThirdAction.action" method="post">ThirdAction
package Action;
/**
* Created with IntelliJ IDEA.
* User: YEN
* Date: 2016/8/2
* Time: 19:58
*/
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
/**
* 静态对象获取web资源
*/
public class ThirdAction extends ActionSupport{
@Override
public String execute() throws Exception {
ActionContext ac=ActionContext.getContext();
ServletRequest request=(ServletRequest)ac.get(ServletActionContext.HTTP_REQUEST);
ServletResponse response=(ServletResponse)ac.get(ServletActionContext.HTTP_RESPONSE);
ServletContext context=(ServletContext)ac.get(ServletActionContext.SERVLET_CONTEXT);
String username=request.getParameter("username");
String password=request.getParameter("password");
System.out.println(username+"............"+password);
return super.execute();
}
}
第四种方式：静态对象获取方式2
struts.xml
<action name="FourAction" class="Action.FourAction">
<result name="success">/success.jsp</result>
</action>index.jsp
<form action="FourAction.action" method="post">FourAction
package Action;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;
import javax.servlet.ServletRequest;
/**
* Created with IntelliJ IDEA.
* User: YEN
* Date: 2016/8/2
* Time: 20:04
*/
public class FourAction extends ActionSupport {
@Override
public String execute() throws Exception {
ServletRequest request= ServletActionContext.getRequest();
System.out.println("第四种方式"+request.getParameter("username")+".............."+request.getParameter("password"));
return SUCCESS;
}
}
四种方式中第四种最简单，在一般开发中最常用的也是第四种。
登陆小实例
struts.xml
<action name="LoginAction" class="Action.LoginAction">
<result name="success">/success.jsp</result>
<result name="error">/error.jsp</result>
</action>
Users
package Action;
/**
* Created with IntelliJ IDEA.
* User: YEN
* Date: 2016/8/2
* Time: 13:37
*/
public class Users {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
LoginAction
package Action;
import org.apache.struts2.ServletActionContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
/**
* Created with IntelliJ IDEA.
* User: YEN
* Date: 2016/8/2
* Time: 12:55
*/
public class LoginAction {
private String username;
private String password;
/**属性驱动方式
* 并且将获取到的信息存到session中 供其它页面使用
* @return
*/
public String execute(){
if("admin".equals(username) && "admin".equals(password)){
Users user=new Users();
user.setUsername(username);
user.setPassword(password);
HttpServletRequest request= ServletActionContext.getRequest();
HttpSession session=request.getSession();
session.setAttribute("user",user);
return "success";
}else return "error";
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<h2>用户登陆</h2>
<form action="LoginAction.action" method="post">
<ul>
<li>姓名:<input type="text" name="username"></li>
<li>密码:<input type="text" name="password"></li>
<li><input type="submit" value="提交"></li>
</ul>
</form>
</body>
</html>success.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
success!!
<%
Users user=(Users)session.getAttribute("user");
%>
欢迎您：<%=user.getUsername()%>
</body>
</html>
Success页面获取到了登陆的用户名 说明存到了session中。
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原文地址：http://blog.csdn.net/yen_csdn/article/details/52097513
