一、通过get set方法获取
在对应的action类中定义同名变量,并生成set get方法,那么参数将会自动获取值
String username; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } System.out.println(username);//结果为1321312
二、通过ServletActionContext获取//导入import org.apache.struts2.ServletActionContext;
HttpServletRequest reqeust= ServletActionContext.getRequest(); String username=reqeust.getParameter("username");//字符串 //url: http://localhost:8080/StudentSystem/role_list.action?username=1321312&username=34343 String[] username=reqeust.getParameterValues("username");//字符串数组 System.out.println(username);//结果为1321312 System.out.println(username[0]);//结果为1321312
三、通过ActionContext获取//导入import com.opensymphony.xwork2.ActionContext;
ActionContext context = ActionContext.getContext(); Map params = context.getParameters(); String[] username=(String[])params.get("username"); //ActionContext获取到一个对象如object或String[] System.out.println(username[0]);//结果为1321312