Struts2（6）——Action传递参数

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1. 将参数作为Action的成员变量

在Action中给定一个私有属性，并实现其set、get访问器，然后即可直接接收请求中的参数。

package com.imm.demo;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;import java.util.Map;public class Demo8Action extends ActionSupport {    private String name;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    @Override    public String execute() throws Exception {        System.out.println("name:"+name);        return SUCCESS;    }}

能够这样实现的原因是在于，Action是线程安全的。而Servlet时代则不可行，因为Servlet是在客户端第一次请求某个Servlet时根据web.xml实例化的，在后续无论多少个请求访问该Servlet，都不会再实例化，而是访问同一个Servlet，因此Servlet只能在方法中接收参数。

2.通过某个实体对象

创建实体类，然后创建Action的私有属性为该实体类的实例。如下：

package com.xiaoyin.demo;import com.opensymphony.xwork2.ActionSupport;import com.xiaoyin.entity.User;public class Demo9Action extends ActionSupport {    private User user;    public User getUser() {        return user;    }    public void setUser(User user) {        this.user = user;    }    @Override    public String execute() throws Exception {        System.out.println(user);        return SUCCESS;    }}

package com.xiaoyin.entity;import java.util.Date;public class User {    private String name;    private int age;    private Date birthday;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    @Override    public String toString() {        return "User{" +                "name='" + name + '\'' +                ", age=" + age +                ", birthday=" + birthday +                '}';    }}

<%--  Created by IntelliJ IDEA.  User: ASCEND  Date: 2017/9/10  Time: 1:24  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="utf-8" %><html><head>    <meta http-equiv="Content-Type" content="text/html" ;charset="utf-8"/>    <title>hello</title></head><body><h1>hello</h1><form action="${pageContext.request.contextPath}/Demo9Action.action" method="get">    名字：<input type="text" name="user.name"><br/>    年龄：<input type="text" name="user.age"><br/>    出生日期：<input type="text" name="user.birthday"><br/>    <input type="submit" value="提交"></form></body></html>

3.模型驱动传参

创建实体类的实例作为Action的成员变量，Action实现ModelDriven接口，并重写该接口方法，成员对象须被初始化，以免重写的方法返回null值。

package com.xiaoyin.demo;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;import com.xiaoyin.entity.User;public class Demo10Action extends ActionSupport implements ModelDriven<User> {    private User user=new User();    @Override    public String execute() throws Exception {        System.out.println(user);        return SUCCESS;    }    public User getModel() {        return user;    }}

<%--  Created by IntelliJ IDEA.  User: ASCEND  Date: 2017/9/10  Time: 1:24  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="utf-8" %><html><head>    <meta http-equiv="Content-Type" content="text/html" ;charset="utf-8"/>    <title>hello</title></head><body><h1>hello</h1><form action="${pageContext.request.contextPath}/Demo10Action.action" method="get">    名字：<input type="text" name="name"><br/>    年龄：<input type="text" name="age"><br/>    出生日期：<input type="text" name="birthday"><br/>    <input type="submit" value="提交"></form></body></html>

4.集合类型的参数封装

import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;import com.xiaoyin.entity.User;import java.util.List;public class Demo11Action extends ActionSupport {    private List<String> list;    public List<String> getList() {        return list;    }    public void setList(List<String> list) {        this.list = list;    }    @Override    public String execute() throws Exception {        System.out.println("list:"+list);        return SUCCESS;    }}

将集合类型作为Action的一个属性，然后jsp页面

<%--  Created by IntelliJ IDEA.  User: ASCEND  Date: 2017/9/10  Time: 1:24  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="utf-8" %><html><head>    <meta http-equiv="Content-Type" content="text/html" ;charset="utf-8"/>    <title>hello</title></head><body><h1></h1><form action="${pageContext.request.contextPath}/Demo11Action.action" method="post">    名字：<input type="text" name="list"><br/>    年龄：<input type="text" name="list[1]"><br/>    地址：<input type="text" name="list[3]"><br/>    <input type="submit" value="提交"></form></body></html>

如果提交Map类型的数据，那么jsp页面表单input的name应该是

name=属性名['键']

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