Java struts 學習記錄與案例
開始進行測試，引入2個檔案：
index.jsp
程式碼：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>主頁</title>
</head>
<body>
<a href="first.action">請求Struts2</a>
</body>
</html>
在web。xml檔案中新增對映器：
<!-- Struts2過濾器 -->
<filter>
<!-- 過濾器名稱 -->
<filter-name>struts2</filter-name>
<!-- 過濾器類 -->
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<!-- Struts2過濾器對映 -->
<filter-mapping>
<!-- 過濾器名稱 -->
<filter-name>struts2</filter-name>
<!-- 過濾器對映 -->
<url-pattern>/*</url-pattern>
</filter-mapping>
檔案 struts.xml 放到專案的src目錄下， 程式碼是：
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<!-- 宣告包 -->
<package name="myPackage" extends="struts-default">
<!-- 定義action -->
<action name="first">
<!-- 定義處理成功後的對映頁面 -->
<result>/first.jsp</result>
</action>
</package>
</struts>
新增 包檔案：
開始進行測試，引入2個檔案：
index.jsp
程式碼：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>主頁</title>
</head>
<body>
<a href="first.action">請求Struts2</a>
</body>
</html>
first.jsp程式碼：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>第一個Struts2程式</title>
</head>
<body>
第一個Struts2程式!
<br>
</body>
</html>
=================================================================================
動態action的應用
index.jsp 程式碼：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>首頁</title>
</head>
<body>
<a href="userAction!add">新增使用者</a>
<br>
<a href="userAction!update">更新使用者</a>
</body>
</html>
--------------------------------------------------------------------
在web。xml檔案中新增對映器：
<!-- Struts2過濾器 -->
<filter>
<!-- 過濾器名稱 -->
<filter-name>struts2</filter-name>
<!-- 過濾器類 -->
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<!-- Struts2過濾器對映 -->
<filter-mapping>
<!-- 過濾器名稱 -->
<filter-name>struts2</filter-name>
<!-- 過濾器對映 -->
<url-pattern>/*</url-pattern>
</filter-mapping>
------------------------------------------------------------------
struts.xml程式碼：
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<!-- 宣告包 -->
<package name="myPackage" extends="struts-default">
<!-- 定義action -->
<action name="userAction" class="com.lyq.action.UserAction">
<!-- 新增成功的對映頁面 -->
<result name="add">user_add.jsp</result>
<!-- 更新成功的對映頁面 -->
<result name="update">user_update.jsp</result>
</action>
</package>
</struts>
---------------------------------------------------------------------
UserAction.Java 類程式碼：
package com.lyq.action;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport {
private static final long serialVersionUID = 1L;
// 提示資訊
private String info;
// 新增使用者資訊
public String add() throws Exception{
info = "新增使用者資訊";
return "add";
}
// 更新使用者資訊
public String update() throws Exception{
info = "更新使用者資訊";
return "update";
}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
}
------------------------------------------------------------------
user_add.jsp程式碼：
<%@ 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>新增使用者資訊</title>
</head>
<body>
<font color="red">
<s:property value="info"/>
</font>
</body>
</html>
-------------------------------------------------------------------
user_update.jsp檔案程式碼：
<%@ 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>更新使用者資訊</title>
</head>
<body>
<font color="red">
<s:property value="info"/>
</font>
</body>
</html>
=========================================================================================
處理對錶單提交的資料：
index.jsp程式碼：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>主頁</title>
<style type="text/css">
*{font-size: 12px;}
</style>
</head>
<body>
<form action="greeting.action" method="post">
請輸入你的姓名：<input type="text" name="username">
<input type="submit" value="提交">
</form>
</body>
</html>
----------------------------------------------------------------------
struts.xml程式碼：
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<!-- 宣告包 -->
<package name="myPackage" extends="struts-default">
<!-- 定義action -->
<action name="greeting" class="com.lyq.action.GreetingAction">
<!-- 定義成功的對映頁面 -->
<result name="success">success.jsp</result>
<!-- 定義失敗的對映頁面 -->
<result name="error">error.jsp</result>
</action>
</package>
</struts>
---------------------------------------------------------------
GreetingAction.java程式碼：
package com.lyq.action;
import com.opensymphony.xwork2.ActionSupport;
public class GreetingAction extends ActionSupport {
private static final long serialVersionUID = 1L;
// 使用者名稱
private String username;
// 處理請求
@Override
public String execute() throws Exception{
// 判斷使用者名稱是否有效
if(username == null || "".equals(username)){
// 返回到錯誤頁面
return ERROR;
}else{
// 返回到成功頁面
return SUCCESS;
}
}
// username屬性的getter方法
public String getUsername() {
return username;
}
// username屬性的setter方法
public void setUsername(String username) {
this.username = username;
}
}
-------------------------------------------------------
success.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>歡迎</title>
<style type="text/css">
*{font-size: 12px;}
</style>
</head>
<body>
<font color="red">
<s:property value="username" />
</font>
，您好！
<br>
歡迎使用來到本站。
</body>
</html>
---------------------------------------------------------
error.jsp程式碼：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>錯誤</title>
</head>
<body>
<font color="red"> 錯誤：您沒有輸入姓名！</font>
</body>
</html>