三个页面，

     
         
              
                   
                        
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import java.util.HashMap;import java.util.Map;import net.sf.json.JSONObject;import com.opensymphony.xwork2.ActionSupport;public class checkuserAction extends ActionSupport {
         private String username;    private JSONObject obj;    private String result;    /**     * @return     */    public String execute() {        String msg = "";        if (username.equals("admin")) {            msg="已经注册啦，不行";        }        else {            msg="可以注册，放心";        }        Map
     
        map = new HashMap
      
       ();        map.put("msg", msg);        obj=JSONObject.fromObject(map);        result=obj.toString();        return SUCCESS;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public JSONObject getObj() {        return obj;    }    public void setObj(JSONObject obj) {        this.obj = obj;    }    public String getResult() {        return result;    }    public void setResult(String result) {        this.result = result;    }}
      
     

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%>
     
     
     
     
     
             
     

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