【struts2】学习笔记
常见问题及注意事项：
1.下载struts2时，要看清所下载的版本，不同版本web.xml配置路径不同！
2. 导入jar包时，导入的包要完全准确，缺少或过多的会导致缺失或冲突！
3. RegisterAction-validation.xml 客户端校验无效，暂未解决。
1. 下载struts2软件包
下载地址：http://struts.apache.org/download.cgi#struts2513
2. 在web工程中导入struts包中的jar文件
2.1 将下载好的struts包下的一些核心类库复制到/WEB-INF/lib目录下，并构建路径。
3. web.xml配置
3.1 针对不同struts版本，web.xml配置方式有所不同！
check your struts2-core-x.x.jar version.
-->if it is struts2-core-2.5.jar then change your filter class tag value in web.xml to
<filter-class>
org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter
</filter-class>
-->if it is struts2-core-2.1.3.jar then change your filter class tag value in web.xml to
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
FilterDispatcher is deprecated since Struts 2.1.3. If you are working with older versions then user above solution.
-->if it is struts2-core-2.3.X.jar then change your filter class tag value in web.xml to
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
3.2 配置web.xml（本人struts版本为struts2.3）
<?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">
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<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>
4. struts配置实例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>
<package name="struts2" extends="struts-default">
<action name="login" class="com.gxh.action.LoginAction">
<result name="success">/login_success.jsp</result>
<result name="failure">/login_failure.jsp</result>
<result name="input">/login.jsp</result>
</action>
<action name="input" class="com.gxh.action.InputAction">
<result name="success">/demo/output.jsp</result>
<result name="input">/demo/input.jsp</result>
</action>
<action name="register" class="com.gxh.action.RegisterAction">
<result name="success">/demo2/result.jsp</result>
<result name="input">/demo2/register2.jsp</result>
</action>
</package>
</struts>
5. 创建控制类Action
//LoginCheck.java类,校验用户名和密码
public class LoginCheck{
public boolean isLogin(String username,String password){
if("tom".equals(username) && "123".equals(password)){
return true;
}else{
return false;
}
}
}
方式一：编写普通的实体类，如loginAction.java ,重写execute()方法
public class LoginAction{
private String username;
private String password;
public void setUsername(String username){
this.username = username;
}
public String getUsername(){
return username;
}
public void setPassword(String password){
this.passwordpassword
}
public String getPassword(){
return password
}
public String execute()throws Exception{
LoginCheck lc = new LoginCheck(); //LoginCheck.java类另写
if(lc.isLogin(getUsername(),getPassword())){
ActionContext.getContext().getSession().put("login","true");
return "success";
}else{
return "failure";
}
}
}
//配置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>
<package name="struts2" extends="struts-default">
<action name="login" class="com.gxh.action.LoginAction">
<result name="success">/login_success.jsp</result>
<result name="failure">/login_failure.jsp</result>
</action>
</package>
</struts>
方式二：编写Java类，实现Action接口，如LoginAction2.java
public class LoginAction2 implements Action{
public String username;
public String password;
public void setUsername(String username){
this.username = username;
}
public String getUsername(){
return username;
}
public void setPassword(String password){
this.password = password;
}
public String getPassword(){
return password;
}
public String execute()throws Exception{
LoginCheck lc = new LoginCheck(); //LoginCheck.java类另写
if(lc.isLogin(getUsername(),getPassword())){
ActionContext.getContext().getSession().put("login","true");
return SUCCESS;
}else{
return ERROR;
}
}
}
//配置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>
<package name="struts2" extends="struts-default">
<action name="login" class="com.gxh.action.LoginAction2">
<result name="success">/login_success.jsp</result>
<result name="error">/login_failure.jsp</result>
</action>
</package>
</struts>
方式三：编写Java类，继承ActionSupport类，如LoginAction3.java
public class LoginAction3 extends ActionSupport{
public String username;
public String password;
public void setUsername(String username){
this.username = username;
}
public String getUsername(){
return username;
}
public void setPassword(String password){
this.password = password;
}
public String getPassword(){
return password;
}
pubic void validate(){
if(getUsername() == null || "".equals(getUsername().trim()) ){
this.addFieldError("username","username can not empty."); //username为在username标签上提示错误，
}else if(!getUsername().matches("正则式")){ //
this.addFieldError("username","username is invalidate.");
}
if(getPassword() == null || "".equals(getPassword().trim())){
this.addFieldError("password","password can not empty."); //password为在password
}else if(!getPassword().matches("正则式")){
this.addFieldError("password","password is invalidate.");
}
}
public String execute()throws Exception{
LoginCheck lc = new LoginCheck(); //LoginCheck.java类另写
if(lc.isLogin(getUsername(),getPassword())){
ActionContext.getContext().getSession().put("login","true");
return SUCCESS;
}else{
return ERROR;
}
}
}
//配置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>
<package name="struts2" extends="struts-default">
<action name="login" class="com.gxh.action.LoginAction3">
<result name="success">/login_success.jsp</result>
<result name="error">/login_failure.jsp</result>
<result name="input">/login.jsp</result> //当验证不通过时，跳转到登录页面
</action>
</package>
</struts>
struts学习总结
1. struts应用
- 表单设计，使用struts标签替换传统的HTML标签；
- 使用Action-validation.xml实现客户端校验；
- 通过重写validate()方法实现服务器端校验。
