转贴-在Struts2的Action中获得请求参数值的几种方法
转贴--在Struts2的Action中取得请求参数值的几种方法在Struts2的Action中取得请求参数值的几种方法文章分
转贴--在Struts2的Action中取得请求参数值的几种方法
在Struts2的Action中取得请求参数值的几种方法
文章分类:Java编程
先看GetRequestParameterAction类代码：?
Java代码?
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("方法一，把参数作为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??parameterMap=context.getParameters(); ?????????? ??????????String?bookName2[]=(String[])parameterMap.get("bookName"); ??????????String?bookPrice2[]=(String[])parameterMap.get("bookPrice"); ?????????? ??????????System.out.println("方法二，在Action中使用ActionContext得到parameterMap获取参数："); ??????????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("方法三，在Action中取得HttpServletRequest对象，使用request.getParameter获取参数："); ??????????System.out.println("bookName:?"?+bookName); ??????????System.out.println("bookPrice:?"?+bookPrice); ??????????return?SUCCESS; ?????????? ??????} ????}?
总结：
方法一：当把参数作为Action的类属性，且提供属性的getter/setter方法时，xwork的OGNL会自动把request参数的值设置到类属性中，此时访问请求参数只需要访问类属性即可。方法二：可以通过ActionContext对象Map? parameterMap=context.getParameters();方法，得到请求参数Map，然后通过parameterMap来获取请求参数。需要注意的是：当通过parameterMap的键取得参数值时，取得是一个数组对象，即同名参数的值的集合。方法三：通过ActionContext取得HttpServletRequest对象，然后使用request.getParameter("参数名")得到参数值
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