Struts2接收参数的三种方式

最新推荐文章于 2019-04-20 00:02:10 发布

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最新推荐文章于 2019-04-20 00:02:10 发布

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分类专栏： struts2 文章标签： struts2.0

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本文介绍了Struts2中接收参数的三种主要方法：通过Action属性直接接收、使用Domain Model来映射请求参数以及实现ModelDriven接口进行参数绑定。这些方法帮助开发者根据不同场景灵活选择最合适的参数接收方案。

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Struts2接收参数的三种方式：

1.使用action属性接收参数：

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>
<constant name="struts.enable.DynamicMethodInvocation" value="true"/>
<constant name="struts.devMode" value="true" />
<package name="user" namespace="/user" extends="struts-default">


<action name="user" class="hpu.edu.cn.action.UserAction">
<result>
/user_add_success.jsp
</result>
</action>
</package>


</struts>

index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>
<a href="${pageContext.request.contextPath}/user/user!add?name=jack&age=8">添加学生</a><br>
</body>
</html>

UserAction.java

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{
private String name;
private String age;
public String add() {
System.out.println("name= "+name);
System.out.println("age= "+age);
return SUCCESS;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
}
输出结果：
name= jack
age= 8

2.使用Domain Model接收参数

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>
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
<constant name="struts.devMode" value="true" />
<package name="user" namespace="/user" extends="struts-default">


<action name="user" class="hpu.edu.cn.action.UserAction">
<result>
/user_add_success.jsp
</result>
</action>
</package>


</struts>

UserAction.java
public class UserAction extends ActionSupport{
private User user;
public String add() {
System.out.println("name= "+user.getName());
System.out.println("age= "+user.getAge());
return SUCCESS;
}
public User getUser() {
return user;
}

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

}

User.java
public class User {
private String name;
private String age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}

}

index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>
<a href="${pageContext.request.contextPath}/user/user!add?user.name=jack&user.age=8">添加用户</a> <br>
</body>
</html>
输出结果：
name= jack
age= 8

3.使用Model Driven接收参数（这种方式并不常用，但是隐含了一种非常重要的程序设计
思想）
struts.xml同上
UserAction.java

public class UserAction extends ActionSupport implements ModelDriven<User>{
User user = new User();
public String add() {
System.out.println("name= "+user.getName());
System.out.println("age= "+user.getAge());
return SUCCESS;
}
@Override
public User getModel() {
// TODO Auto-generated method stub
return user;
}

}
User.java
public class User {
private String name;
private String age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}

}
index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">


</head>

<body>
<a href="${pageContext.request.contextPath}/user/user!add?name=jack&age=8">添加用户</a> <br>
</body>
</html>
name= jack
age= 8