Action获取表单提交数据
之前我们web阶段中,提交表单到servlet里面,在servlet里面使用
request对象里面的方法获取,getParameter,getParameterMap提交表单到action,但是action没有request对象,不能直接使用
request对象此时我们就要思考怎样才能获取到表单中的信息?Action的确给出了三种获取的方式
action获取表单提交数据主要三种方式
form.jsp类的代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>1.使用ActionContext类
(1).获取ActionContext对象
这个ActionContext类对象不是new出来的 而是通过类ActionContext中的一个静态方法getContext来获取的
(2).通过getParameters()返回一个包含所有HttpServletrequest参数信息(Map)
用getParameters返回一个Map<String,Parameter> 属性的表单
例子
Form1DemoAction
public class Form1DemoAction extends ActionSupport{
@Override
public String execute() throws Exception {
//1 获取ActionContext对象
ActionContext context=ActionContext.getContext();
context.getParameters();
//获取Map属性表单
Map<String, Parameter> map=context.getParameters();
//遍历Map
Set<String> keys=map.keySet();
for(String s:keys) {
System.out.println(map.get(s));
}
return NONE;
}
}
struts.xml
<action name="form1" class="cn.itcast.form.Form1DemoAction"></action>
控制台也打印出相应的情况
2.使用ServletActionContext类
- static HttpServletRequest getRequest():获取Web应用的HttpServletRequest对象
- static HttpServletResponse getResponse():获取Web应用的HttpServletResponse对象
- static ServletContext getServletContext():获取Web应用的ServletContext对象
- static PageContext getPageContext():获取Web应用的PageContext对象
显然我们可以通过获取HttpServletRequest来进行解决
Form2DemoAction
public class Form2DemoAction extends ActionSupport {
@Override
public String execute() throws Exception {
HttpServletRequest request=ServletActionContext.getRequest();
String username=request.getParameter("username");
String password=request.getParameter("password");
String address=request.getParameter("address");
System.out.println(username+" "+password+" "+address);
return NONE;
}
}struts.xml
<action name="form2" class="cn.itcast.form.Form2DemoAction"></action>form1.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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.使用接口注入方式
- 让action实体接口ServletRequestAware 为了得到request对象
Form3DemoAction
public class Form3DemoAction extends ActionSupport implements ServletRequestAware{
private HttpServletRequest request;
@Override
public void setServletRequest(HttpServletRequest request) {
this.request=request;
}
@Override
public String execute() throws Exception {
String username=request.getParameter("username");
String password=request.getParameter("password");
String address=request.getParameter("address");
System.out.println(username+" "+password+" "+address);
return NONE;
}
}struts.xml
<action name="form3" class="cn.itcast.form.Form3DemoAction"></action>form1.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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="提交"/>
</form>
</body>
</html>
在action操作域对象
- request,session,servletContext域对象
- 使用ServletActionContext类进行操作
END！！！！！！！！！！
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