【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.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 "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标签上提示错误,
        }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

  • 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。

  

posted @ 2017-09-25 20:44  时光x86  阅读(265)  评论(0编辑  收藏  举报