新建一个struts2的项目步骤如下（当前版本为2.3.16.1）
整体如右图：
1、将struts2的jar包导入lib下
必须要导入的jar包有：
- commons-fileupload-1.3.1.jar
- commons-io-2.2.jar
- commons-lang3-3.1.jar
- freemarker-2.3.19.jar
- javassist-3.11.0.GA.jar
- ognl-3.0.6.jar
- struts2-core-2.3.16.3.jar
- xwork-core-2.3.16.3.jar
2、在WEB-INF下新建web.xml文件
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
3、在src下新建action 类及实体类
- 新建LoginAction类
1 package action; 2 3 import java.util.HashMap; 4 import java.util.Map; 5 6 import com.opensymphony.xwork2.ActionSupport; 7 8 import entity.User; 9 10 public class LoginAction extends ActionSupport{ 11 /** 12 * serialID 13 */ 14 private static final long serialVersionUID = 1L; 15 private User user; 16 private static Map<String,String> users = new HashMap<String,String>(); 17 static{ 18 users.put("bill", "1234"); 19 users.put("mike", "4321"); 20 } 21 /** 22 * login 23 * @return result after deal the logic 24 */ 25 public String login(){ 26 if(user.getNickname().equals("hello")){ 27 return SUCCESS; 28 }else{ 29 return INPUT; 30 } 31 } 32 public User getUser() { 33 return user; 34 } 35 public void setUser(User user) { 36 this.user = user; 37 } 38 }
- 新建实体类
1 package entity; 2 3 public class User { 4 private String nickname; 5 private String password; 6 public String getNickname() { 7 return nickname; 8 } 9 public void setNickname(String nickname) { 10 this.nickname = nickname; 11 } 12 public String getPassword() { 13 return password; 14 } 15 public void setPassword(String password) { 16 this.password = password; 17 } 18 }
4、在src下创建struts.xml
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE struts PUBLIC 3 "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" 4 "http://struts.apache.org/dtds/struts-2.3.dtd"> 5 6 <struts> 7 <constant name="struts.devMode" value="true" /> 8 <constant name="struts.custom.i18n.resources" value="message" /> 9 <package name="default" namespace="/" extends="struts-default"> 10 <default-action-ref name="index" /> 11 <action name="index"> 12 <result>/WEB-INF/pages/login.jsp</result> 13 </action> 14 15 </package> 16 <package name="user" namespace="/user" extends="struts-default"> 17 <!-- =========================================================login --> 18 <action name="Login_*" method="{1}" class="action.LoginAction"> 19 <result name="success">/WEB-INF/pages/main.jsp</result> 20 <result name="input">/WEB-INF/pages/login.jsp</result> 21 </action> 22 <!-- =========================================================main --> 23 <action name="Main_*"> 24 <result>/WEB-INF/pages/{1}.jsp</result> 25 </action> 26 </package> 27 28 </struts>
5、创建jsp文件
- login.jsp
1 <%@ page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8"%> 3 <%@ taglib prefix="s" uri="/struts-tags" %> 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 5 <html> 6 <head> 7 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 8 <title>login</title> 9 </head> 10 <body> 11 <s:form action="Login_login" method="post" theme="simple" namespace="/user"> 12 nickname<s:textfield name="user.nickname"/> 13 <b style="color: red"> 14 <s:property value="fieldErrors['user.nickname'][0]"/> 15 </b><br/> 16 password<s:password name="user.password"/> 17 <b style="color: red"> 18 <s:property value="fieldErrors['user.password'][0]"/> 19 </b><br/> 20 <s:submit value="%{getText('button.login')}" cssStyle=" 85px; height: 30px;"/> 21 </s:form> 22 </body> 23 </html>
- main.jsp
1 <%@ page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 7 <title>main</title> 8 </head> 9 <body> 10 welcome ${user.nickname},come in <br> 11 <a href="Main_login">logout</a> <a href="Main_register">register</a> 12 </body> 13 </html>
6、加入国际化资源
- 在struts.xml中加入<constant name="struts.custom.i18n.resources" value="message" />
- 在src下创建message.properties
1 # -- button -- 2 button.login=login 3 # -- errors -- 4 error.nickname.required=nickname is required 5 error.password.required=Password is required
7、加入验证
- 在LoginAction.java文件目录下创建LoginAction-validation.xml
1 <!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.2//EN" "http://struts.apache.org/dtds/xwork-validator-1.0.2.dtd"> 2 3 <validators> 4 5 <field name="user.nickname"> 6 <field-validator type="requiredstring"> 7 <param name="trim">true</param> 8 <message key="error.nickname.required"/> 9 </field-validator> 10 </field> 11 12 <field name="user.password"> 13 <field-validator type="requiredstring"> 14 <message key="error.password.required"/> 15 </field-validator> 16 </field> 17 18 </validators>