Struts2+Jquery+实现Ajax无刷新验证用户名是否存在

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<body>  
    <s:form action="registAction" method="post" namespace="/user">  
        <table>  
            <tr>  
                <td>UserName</td>              
                <td id="t1"><input type="text" name="userName" id="userName"  /></td>             
                <td><input type="button" id="test" value="Test" /><div id="tip1"></div></td>             
            </tr>  
            <tr>  
                <td>Password</td>              
                <td id="t2" colspan="2"><input type="password" name="userPwd1" id="userPwd1" /></td>             
            </tr>  
            <tr>  
                <td>Password AG</td>               
                <td id="t3" colspan="2"><input type="password" name="userPwd2" id="userPwd2" /></td>             
            </tr>  
            <tr>  
                <td colspan="3">  
                    <input type="submit" value="submit" />  
                    <input type="reset" value="reset" />  
                </td>  
            </tr>  
        </table>  
    </s:form>  
</body>
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javaScript代码：

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$(document).ready(function(){   
    var inputUserNameObj = $("#userName");   
    var inputUserPwd1Obj = $("#userPwd1");   
    var inputUserPwd2Obj = $("#userPwd2");   
     
    $("#userName").blur(function(){   
        var text = inputUserNameObj.val();   
        $.post("testAction.action?userName="+text,null,function(response){    
            if(response=="用户名已经存在"){
             document.getElementById("tip1").innerHTML="<font color='red'>"+response+"</font>";
            }else{
             document.getElementById("tip1").innerHTML="<font color='blue'>"+response+"</font>";
            }
        });   
    });   
       
});
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Action代码：

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public class TestAction extends ActionSupport{   
  
    HttpServletRequest hsr; 
    
    String result;   
       
    public HttpServletRequest getHsr() {   
        return hsr;   
    }   
  
    public void setHsr(HttpServletRequest hsr) {   
        this.hsr = hsr;   
    }   
  
    public String getResult() {   
        return result;   
    }   
  
    public void setResult(String result) {   
        this.result = result;   
    }   
  
    public String test() throws IOException{   
      
        Map<String, String> map = new HashMap<String, String>();   
           
        ActionContext ac = ActionContext.getContext();   
        HttpServletRequest req = (HttpServletRequest)ac.get(ServletActionContext.HTTP_REQUEST);   
        HttpServletResponse res = (HttpServletResponse)ac.get(ServletActionContext.HTTP_RESPONSE);   
        String userName = req.getParameter("userName");   
        map.put("userName", userName);   
              
        res.setContentType("text/html;charset=UTF-8");   
        
        PrintWriter w = res.getWriter();   
       
        if("jack".equals(userName)){   
             // 将要返回的map对象进行json处理      
            JSONObject jo = JSONObject.fromObject(map);      
            System.out.println("进入了.....");
            // 调用json对象的toString方法转换为字符串然后赋值给result      
            this.result = jo.toString();      
            w.println("用户名已经存在");   
        }else{   
            w.println("用户名不存在");   
        }   
        w.close();   
        
        return "success";   
    }       
}
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Struts配置：

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<package name="ajax" extends="json-default" >  
        <!-- 检验用户名是否存在 -->  
        <action name="testAction" class="com.hisoft.jqt.action.TestAction" method="test">  
            <!-- 返回类型为json 在sjon-default中定义 -->  
            <result type="json" name="success">  
                <!-- root的值对应要返回的值的属性 -->  
                <!-- 这里的result值即是 对应action中的 result -->  
                <param name="root">result</param>  
            </result>  
        </action>  
    </package>
posted @ 2016-12-29 17:57  烟雨观春柳  阅读(86)  评论(0)    收藏  举报