<%@ page pageEncoding="UTF-8"%> 
                 
     
                       用户名：              
                       
       
                      
     
    

后台action代码：

 

MemberAction.java

/** *  ClassName: MemberAction.java*/package com.tjitcast.bbs.web.action.front;import org.apache.struts2.convention.annotation.Action;import org.apache.struts2.convention.annotation.Namespace;import org.apache.struts2.convention.annotation.ParentPackage;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import com.tjitcast.bbs.domain.Member;/** * 检查会员是否存在的Action类 *  * @author yjd */@Controller("front.memberAction")@Scope("prototype")@Namespace("/")@ParentPackage("struts-default")public class MemberAction extends BaseAction {    private static final long serialVersionUID = -4631080996625964833L;    private Member member;    /**     * 检查用户名是否已经存在     */    @Action(value = "checkloginname")    public void checkLoginname() {        Member temp = memberService.get(member.getLoginname());        if (temp != null) {            renderText("用户名已存在，请更换！");        } else {            renderText("恭喜你，这个用户名可用!");        }    }      public void renderText(String text) {        HttpServletResponse response = getResponse();        response.setContentType("text/plain;charset=UTF-8");        try {            response.getWriter().write(text);            response.getWriter().flush();        } catch (IOException e) {            throw new IllegalArgumentException(e); // 把受检异常转换为非受检异常        }    }    public Member getMember() {        return member;    }    public void setMember(Member member) {        this.member = member;    }}

效果如下图：