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struts2学习(二)—action获取表单提交数据的三种方式

2017-03-02 19:52 811 查看

本文内容主要来自创智博客学习视频的整理

http://v.itcast.cn/course/212.html

action获取表单提交数据的三种方式：

(1)使用actionContext类

(2)使用ServletActionContext类

(3)使用接口注入的方式

1.使用actionContext类获取表单数据

在浏览器中输入http://127.0.0.1:8080/struts2All/form1.jsp

，可得网页，在username,password,address中输入相应内容，点“提交”，就可获取到网页上输入的值。

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

public class Form1DemoAction extends ActionSupport {

@Override
public String execute() throws Exception {

// 第一种方式：使用ActionContext类获取表单数据
// 1.获取ActionContext对象
ActionContext context = ActionContext.getContext();
// 2，获取表单数据,key:表单输入项name属性值，value:输入的值
Map<String, Object> map = context.getParameters();
Set<String> keys = map.keySet();
for(String key:keys){
Object[] obj = (Object[])map.get(key);
System.out.println(Arrays.toString(obj));
}
return NONE;
}

}

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/form1.action" method="post">
username:<input type="text" name="username"/>
<br/>
password:<input type="text" name="password"/>
<br/>
address:<input type="text" name="address"/>
<br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>

2.使用ServletActionContext类

在浏览器中输入http://127.0.0.1:8080/struts2All/form1.jsp

，可得网页，在username,password,address中输入相应内容，点“提交”，就可获取到网页上输入的值。

package form;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class Form2DemoAction extends ActionSupport {

public String execute() throws Exception{
//1.使用ServletActionContext类获取请求
HttpServletRequest request = ServletActionContext.getRequest();
String username = request.getParameter("username");
String password = request.getParameter("password");
String address = request.getParameter("address");
System.out.println("username:"+username+" password:"+password+" address:"+address);

return NONE;
}
}

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/form2.action" method="post">
username:<input type="text" name="username"/>
<br/>
password:<input type="text" name="password"/>
<br/>
address:<input type="text" name="address"/>
<br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>

3.使用接口注入的方式

继承ServletRequestAware，request可直接注入进来，然后从中获取数据。

package form;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionSupport;

public class Form3DemoAction extends ActionSupport implements ServletRequestAware{

private HttpServletRequest request;

public String execute() throws Exception{
String username = request.getParameter("username");
String password = request.getParameter("password");
String address = request.getParameter("address");
System.out.println("username:"+username+" password:"+password+" address:"+address);
return NONE;
}

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

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/form3.action" method="post">
username:<input type="text" name="username"/>
<br/>
password:<input type="text" name="password"/>
<br/>
address:<input type="text" name="address"/>
<br/>
<input type="submit" value="submit"/>
</form>
</body>
</html>

4.其他代码部分

4.1 代码架构

4.2 struts文件

<?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="demo2" extends="struts-default" namespace="/">
<action name="form1" class="form.Form1DemoAction">
</action>
<action name="form2" class="form.Form2DemoAction">
</action>
<action name="form3" class="form.Form3DemoAction">
</action>
</package>
</struts>

使用actionContext类获取表单数据

使用ServletActionContext类

使用接口注入的方式

其他代码部分
1 代码架构

2 struts文件

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