Action获取表单提交数据

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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>

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控制台也打印出相应的情况

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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>

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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>

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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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