structs实现三种action的方法

第一种：一般类，带有public String execute()方法。

第二种：继承LoginActionInterface implements Action接口的类。

第三种：继承LoginActionSupport extends ActionSupport抽象类的类。

结构图

三个类的具体写法，也贴上来供大家参考

package com.test.action;

import com.test.dao.UserCheck;
import com.test.vo.User;

public class LoginAction {
  private String username;
  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  private String password;
  
  public String execute()
  {
    User u=new User();
    u.setUsername(this.getUsername());
    u.setPassword(this.getPassword());
    
    /*调用业务逻辑层代码*/
    UserCheck check=new UserCheck();
    if(check.login(u))
    {
      return "login_ok";
    }
    else
    {
      return "login_fail";
    }
    
  }
}

package com.test.action;

import com.opensymphony.xwork2.Action;
import com.test.dao.UserCheck;
import com.test.vo.User;

public class LoginActionInterface implements Action{
  private String username;
  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  private String password;
  
  public String execute()
  {
    User u=new User();
    u.setUsername(this.getUsername());
    u.setPassword(this.getPassword());
    
    /*调用业务逻辑层代码*/
    UserCheck check=new UserCheck();
    if(check.login(u))
    {
      return "login_ok";
    }
    else
    {
      return "login_fail";
    }
    
  }
}

package com.test.action;

import com.opensymphony.xwork2.ActionSupport;
import com.test.dao.UserCheck;
import com.test.vo.User;

public class LoginActionSupport extends ActionSupport{
  
  /**
   * 
   */
  private static final long serialVersionUID = 1L;
  public LoginActionSupport()
  {
    System.out.println("LoginActionSupport");
  }
  private String username;
  public String getUsername() {
    return username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getPassword() {
    return password;
  }

  public void setPassword(String password) {
    this.password = password;
  }

  private String password;
  
  public String execute()
  {
    User u=new User();
    u.setUsername(this.getUsername());
    u.setPassword(this.getPassword());
    
    /*调用业务逻辑层代码*/
    UserCheck check=new UserCheck();
    if(check.login(u))
    {
      return "login_ok";
    }
    else
    {
      return "login_fail";
    }
    
  }
}

其实我们发现，只要具有public String execute()这个方法就行了，还要注意，在继承ActionSupport的时候，默认的execute()是返回success。