Struts2 基本操作

 1 import com.opensymphony.xwork2.Action;
 2 import com.opensymphony.xwork2.ActionSupport;
 3 
 4 /*
 5  * 创建Action类，并继承ActionSupport类
 6  */
 7 @SuppressWarnings("serial")
 8 class TestOne extends ActionSupport {
 9 
10     @Override
11     public String execute() throws Exception {
12         return "";
13     }
14 }
15 
16 //---------------------------------------------
17 
18 /*
19  * 创建Action类实现Action接口
20  */
21 class TestTwo implements Action {
22 
23     @Override
24     public String execute() throws Exception {
25         return "";
26     }
27 
28 }
29 
30 /*
31  * 创建Action类，不继承类，不实现接口
32  */
33 class TestThree {
34     public String execute() {
35         return "";
36     }
37 }

import java.util.Arrays;
import java.util.Map;
import java.util.Set;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class Form1Action extends ActionSupport {
    @Override
    public String execute() throws Exception {
        // 使用ActionContext获取上下文对象进行数据获取
        ActionContext ac = ActionContext.getContext();
        // String str = (String) ac.get("username");
        // System.out.println(str);//null
        Map<String, Object> map = ac.getParameters();
        Set<String> set = map.keySet();
        for (String string : set) {
            // 数组形式：因为输入项可能存在复选框，复选框存在多个值
            Object[] obj = (Object[]) map.get(string);
            System.out.println(string + ":" + Arrays.toString(obj));
        }
        map.get("username");
        return NONE;
    }
}

import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class Form2Action extends ActionSupport {
    @Override
    public String execute() throws Exception {
        // 使用ServletActionContext访问ServletAPI获取内置对象
        HttpServletRequest hr = ServletActionContext.getRequest();
        String username = hr.getParameter("username");
        String password = hr.getParameter("password");
        System.out.println("ServletActionContext:" + username + " : " + password);
        return NONE;
    }
}

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class Form3Action extends ActionSupport implements ServletRequestAware {
    private HttpServletRequest request;

    @Override
    public String execute() throws Exception {
        // 实现接口直接访问SerlvetAPI
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        System.out.println("ServletActionContext:" + username + " : " + password);
        return NONE;
    }

    @Override
    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }

}

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class Form4Action extends ActionSupport {
    @Override
    public String execute() throws Exception {

        // 操作域对象
        // 1.Request域
        HttpServletRequest request = ServletActionContext.getRequest();
        request.setAttribute("request", "requestValue");

        // 2.Session域
        HttpSession session = ServletActionContext.getRequest().getSession();
        session.setAttribute("session", "sessionValue");

        // 3.ServletContext(Application)域
        ServletContext context1 = ServletActionContext.getRequest().getSession().getServletContext();
        ServletContext context2 = ServletActionContext.getServletContext();
        context1.setAttribute("context1", "context1Value");
        context2.setAttribute("context2", "context2Value");

        return NONE;
    }

}

@Override
    public String execute() throws Exception {
        HttpServletRequest hsr = ServletActionContext.getRequest();
        String username = hsr.getParameter("username");
        String password = hsr.getParameter("password");

        User user = new User();
        user.setUsername(username);
        user.setPassword(password);

        System.out.println(user);
        return NONE;
    }

import com.opensymphony.xwork2.ActionSupport;

/**
 * 自动获取表单提交的数据，但不会保持到对象中
 */
@SuppressWarnings("serial")
public class Form5Action extends ActionSupport {
    // 1.创建变量
    private String username;
    private String password;

    // set/get方法
    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;
    }

    @Override
    public String execute() throws Exception {
        System.out.println(username + ":" + password);
        return NONE;
    }

}

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

/**
 * 使用模型驱动封装数据 - ModelDriven
 */
@SuppressWarnings("serial")
// 1.实现接口
public class Form6Action extends ActionSupport implements ModelDriven<User> {
    // 2.创建对象
    // 前提条件：表单输入项name的属性值 与 实体类的变量名称一样才能自动封装到对象内
    User user = new User();

    @Override
    public User getModel() {
        // 3.返回创建的实例对象
        return user;
    }

    @Override
    public String execute() throws Exception {
        System.out.println(user);
        return NONE;
    }

}

import com.opensymphony.xwork2.ActionSupport;

/**
 * 使用表达式封装
 */
@SuppressWarnings("serial")
public class Form7Action extends ActionSupport {
    // 1.声明变量
    private User user;

    // 2.set/get方法
    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    @Override
    public String execute() throws Exception {
        System.out.println(user);
        return NONE;
    }

}

import java.util.List;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class Form8Action extends ActionSupport {
    // 1.声明变量
    private List<User> list;

    // 2.set/get方法
    public List<User> getList() {
        return list;
    }

    public void setList(List<User> list) {
        this.list = list;
    }

    public String execute() throws Exception {
        for (User user : list) {
            System.out.println(user);
        }
        return NONE;
    }
}

        username:<input name="list[0].username" type="text" value=""> <br />
        password:<input name="list[0].password" type="text" value=""> <br />
        
        username:<input name="list[1].username" type="text" value=""> <br />
        password:<input name="list[1].password" type="text" value=""> <br />
        <input type="submit" value="发送">

import java.util.Map;

import com.opensymphony.xwork2.ActionSupport;

@SuppressWarnings("serial")
public class Form9Action extends ActionSupport {
    // 1.声明变量
    private Map<String, User> maps;

    // 2.set/get方法
    public Map<String, User> getMap() {
        return maps;
    }

    public void setMap(Map<String, User> maps) {
        this.maps = maps;
    }

    public String execute() throws Exception {
        System.out.println(maps);
        System.out.println(maps.size());
        maps.entrySet();
        for (Map.Entry<String, User> user : maps.entrySet()) {
            System.out.println(user);
        }
        return NONE;
    }

}

        username:<input name="map[‘a‘].username" type="text" value=""> <br />
        password:<input name="map[‘a‘].password" type="text" value=""> <br />
        
        username:<input name="map[‘b‘].username" type="text" value=""> <br />
        password:<input name="map[‘b‘].password" type="text" value=""> <br />
        <input type="submit" value="发送">