Struts2接收前端参数的三种方法

public class GetRequestParameterAction extends ActionSupport {

    private String bookName;   
    private String bookprice;

    public String getBookName() {
        return bookName;
    }
    public void setBookName(String bookName) {
        this.bookName = bookName;
    }
    public String getBookprice() {
        return bookprice;
    }
    public void setBookprice(String bookprice) {
        this.bookprice = bookprice;
    }

    public String  execute() throws Exception{    

        //方式一： 将参数作为Ａction的类属性，让OGNL自动填充 
        System.out.println("bookName: "+this.bookName); 
        System.out.println("bookPrice: " +this.bookprice);

        //方法二:在Action中使用ActionContext得到parameterMap获取参数: 
        ActionContext context=ActionContext.getContext(); 
        Map<K, V>  parameterMap=context.getParameters();

        String bookName2[]=parameterMap.get("bookName");
        String bookPrice2[]=(String[])parameterMap.get("bookprice");

        System.out.println("bookName: " +bookName2[0]);
        System.out.println("bookPrice: " +bookPrice2[0]);

        //方法三:在Action中取得HttpServletRequest对象，使用request.getParameter获取参数 
        HttpServletRequest request = (HttpServletRequest)context.get(ServletActionContext.HTTP_REQUEST);

        String bookName=request.getParameter("bookName");
        String bookPrice=request.getParameter("bookPrice");

        System.out.println("bookName: " +bookName);
        System.out.println("bookPrice: " +bookPrice);  

        return SUCCESS;  
    }
}