Three ways to get form data in struct2

1. Use ActionContext class 

//1获取ActionContext对象
        ActionContext context = ActionContext.getContext();
        //2.调用方法获取key-value值
        Map<String, Object> map = context.getParameters();
        Set<String> set = map.keySet();
        for(String key :set){
            Object[] o = (Object[]) map.get(key);
            System.out.println(Arrays.toString(o));
        }

. Use ServletActionContext 

 //使用ServletActionContext对象获取request对象
        HttpServletRequest request = ServletActionContext.getRequest();
        //2.使用request对象获取表单数据
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String address = request.getParameter("address");
        System.out.println("username="+username);
        System.out.println("password"+password);
        System.out.println("address"+address);

3. Implement ServletRequestAware interface 

public class FormDemo3Action extends ActionSupport implements ServletRequestAware {
    HttpServletRequest httpServletRequest;
    @Override
    public void setServletRequest(HttpServletRequest httpServletRequest) {
        this.httpServletRequest=httpServletRequest;
    }
    @Override
    public String execute(){
        String username = httpServletRequest.getParameter("username");
        String password = httpServletRequest.getParameter("password");
        System.out.println("username="+username);
        System.out.println("password="+password);

        return NONE;
    }
}

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