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Struts2框架运行机制(拦截器,struts标签)

2016-07-28 17:45 471 查看

此实例实现功能：用户需要指定用户名登陆，登陆成功进入相应页面执行操作，否则返回到登陆页面进行登陆，当直接访问操作页面（登陆后才能访问的页面）时则不允许，须返回登陆页面。

login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="login.action" method="post">
用户名:<input type="text" name="userName"/><br/>
密码:<input type="password" name="userPwd"/><br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>

index.jsp(登陆成功页面)

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:iterator value="books" var="b">
<s:property value="#b.bookId"/>    
<s:property value="#b.bookName"/>    
<s:property value="#b.bookAuthor"/>    
<s:property value="#b.bookPrice"/>    
<s:property value="#b.bookInfo"/><br/>
</s:iterator>

</body>
</html>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Struts05</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>

<filter>
<filter-name>struts</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>

<filter-mapping>
<filter-name>struts</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

4000

</web-app>

拦截器

package com.hellojava.web.tools;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class MyInterceptor extends AbstractInterceptor{
@Override
public String intercept(ActionInvocation actioninvocation) throws Exception {
System.out.println("myinterceptor拦截开始");
//调用目标Action的execute() 后返回的字符串
//actioninvocation.invoke() 调用客户端请求的action 的 execute()
String result=actioninvocation.invoke();
System.out.println("myinterceptor拦截结束");
return result;
}
}

loginAction

package com.hellojava.web.action;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
private String userName;
private String userPwd;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
@Override
public String execute() throws Exception {
if(!"".equals(userName) && !"".equals(userPwd)){
return this.SUCCESS;
}else{
return this.ERROR;
}
}
}

LoadBookAction

package com.hellojava.web.action;

import java.util.ArrayList;
import java.util.List;

import com.hellojava.web.entity.Book;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoadBookAction extends ActionSupport {
private List<Book> books=new ArrayList<Book>();
public List<Book> getBooks() {
return books;
}
public void setBooks(List<Book> books) {
this.books = books;
}

public String execute(){
for (int i = 0; i < 20; i++) {
Book b=new Book();
b.setBookId(i+1);
b.setBookName("Java权威指南"+(i+1));
b.setBookAuthor("张三");
b.setBookPrice(22+i);
b.setBookInfo("测试");
books.add(b);
}
return this.SUCCESS;
}
}

Book

package com.hellojava.web.entity;

import java.io.Serializable;

public class Book implements Serializable{
private int bookId;
private String bookName;
private String bookAuthor;
private double bookPrice;
private String bookInfo;

public int getBookId() {
return bookId;
}
public void setBookId(int bookId) {
this.bookId = bookId;
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getBookAuthor() {
return bookAuthor;
}
public void setBookAuthor(String bookAuthor) {
this.bookAuthor = bookAuthor;
}
public double getBookPrice() {
return bookPrice;
}
public void setBookPrice(double bookPrice) {
this.bookPrice = bookPrice;
}
public String getBookInfo() {
return bookInfo;
}
public void setBookInfo(String bookInfo) {
this.bookInfo = bookInfo;
}
}

struts.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>
<constant name="devMode" value="true"></constant>
<package name="struts" namespace="/" extends="struts-default">
<interceptors>
<interceptor name="myinter" class="com.hellojava.web.tools.MyInterceptor"></interceptor>
</interceptors>

<global-results>
<result name="error" type="redirect">/error.jsp</result>
</global-results>
<action name="login" class="com.hellojava.web.action.LoginAction">
<result name="success" type="redirectAction">
<param name="actionName">loadAll</param>
<param name="namespace">/</param>
</result>
</action>

<action name="loadAll" class="com.hellojava.web.action.LoadBookAction">
<result name="success">/index.jsp</result>
</action>

<action name="test" class="com.hellojava.web.action.TestAction">
<interceptor-ref name="defaultStack"></interceptor-ref>
<interceptor-ref name="myinter"></interceptor-ref>
<result name="success">/tag.jsp</result>
</action>
</package>
</struts>

标签页

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 使用struts的表单的标签，必须包含在s:form标签内部 表单标签必须要有name属性 -->
<s:form action="test.action" method="post">
<s:set name="list" value="{'足球','篮球','排球','兵乓球'}"></s:set>
<s:checkboxlist list="#list" name="chk"></s:checkboxlist>
<s:date name="date" format="yyyy年MM月dd HH:mm:ss"/>
<s:doubleselect label="请选择所在省市"
name="province" list="{'四川省','山东省'}"
doubleName="city"
doubleList="top == '四川省' ? {'成都市', '绵阳市'} : {'济南市', '青岛市'}" />

<s:select label="最高学历" name="education" list="{'高中','大学','硕士','博士'}"/>

<s:optiontransferselect
label="最喜爱的图书"
name="javaBook"
list="{'《Java Web开发详解》', '《Struts 2深入详解》', '《Java快速入门》'}"
doubleName="cBook"
doubleList="{'《VC++深入详解》', '《C++ Primer》', '《C++程序设计语言》'}"/>
</s:form>

</body>
</html>

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