标签：用户名存在与否校验 mybatis struts ajax json
操作系统：Windows 7
应用程序服务器：apache-tomcat-6.0.18
开发工具：MyEclipse8.6
Java版本：JDK1.6
MyBatis: 3.2.2
Struts版本：struts-2.3
jQuery版本：jquery-1.4.2.js
MySql版本： 5.0 MySQL Community Server (GPL)
mysql-connector-java：5.0.18
2013年4月16日注:本例中采用的JSON数据格式,推荐使用性能更好的jackson进行序列化,不要使用json-lib
关键点：
1.引入包：struts2对数据进行json序列化，必须要用到struts2的json-lib，struts2-json-plugin包；
2.json数据处理：异步提交的数据采用json格式，struts2-json-plugin会对数据进行json处理，所以struts2配置文件struts.xml中的package节点的extends必须是：extends="json-default"；
例如：<package name="default" namespace="/test" extends="json-default">
3.同样的由于返回的是json数据，所以result的类型也必须采用json；
注意：struts2只能在引入json-lib，struts2-json-plugin包时，result的type属性设定json才不会报错：<result name="userInfo" type="json"></result>
4.针对异步提交，action的result节点值应该为空，即不能再转向(例如：只能为<result name="userInfo" type="json"></result>)；
时序：
绿色代表客户端请求；紫色代表从数据库返回到客户端。
jsp-----(表单提交)---->jQuery------(ajax异步)----->Struts2-----(action取得json数据)----->调用service------->其它(mybatis等)-----(model)----->DB
DB----(model)------>mybatis--------->service-------Struts2(action,result)------->jQuery(ajax)---------->jsp
数据表结构
领域模型
package qh.zcy.entity;
import java.util.Date;
public class UserInfo {
private Integer id;
private String username;
private String password;
private Integer age;
private Date insertdata;
public UserInfo(Integer id, String username, String password, Integer age,
Date insertdata) {
super();
this.id = id;
this.username = username;
this.password = password;
this.age = age;
this.insertdata = insertdata;
}
public UserInfo() {
super();
}
@Override
public String toString() {
// TODO Auto-generated method stub
return "id="+id+",username="+username+",password="+password+",age="+age+",insertdata="+insertdata;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public Date getInsertdata() {
return insertdata;
}
public void setInsertdata(Date insertdata) {
this.insertdata = insertdata;
}
}
底层BaseDaoImpl.java
public int isIn(Map<String, String> isInMap){
SqlSession sqlSession=GetSqlSession.getSqlSession();
int count=sqlSession.selectOne("qh.zcy.dao.UserInfo.isIn", isInMap);
return count;
}UserInfoDaoImpl.java public class UserInfoDaoImpl implements UserInfoDao {
private BaseDao dao=GetBaseDao.getBaseDao();
@Override
public int isIn(Map<String, String> isInMap) {
// TODO Auto-generated method stub
int count=-1;
try {
count=dao.isIn(isInMap);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
GetSqlSession.rollback();
}finally{
GetSqlSession.commit();
}
return count;
}
}
public class UserInfoServiceImpl implements UserInfoService {
private UserInfoDao dao=new UserInfoDaoImpl();
@Override
public boolean isIn(Map<String, String> isInMap) {
// TODO Auto-generated method stub
boolean flag=false;
int count =dao.isIn(isInMap);
Log.getLog().info("count="+count);
if(count >0){
flag=false;
}
else{
flag=true;
}
return flag;
}
}public class IsInAction extends ActionSupport{
private String msg;
private String username;
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
UserInfoService service=new UserInfoServiceImpl();
Log.getLog().info("username="+username);
Map<String, String> isInMap=new HashMap<String, String>();
isInMap.put("username", username);
@SuppressWarnings("unused")
boolean flag=service.isIn(isInMap);
Log.getLog().info("flag="+flag);
if(flag==false){
this.setMsg("该用户名已存在");
}else{
this.setMsg("你可以使用这个用户名");
}
return SUCCESS;
}
}
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <constant name="struts.action.extension" value="action"></constant> <constant name="struts.devMode" value="true"></constant> <package name="JSONName" namespace="/" extends="json-default"> <action name="isIn" class="qh.zcy.action.IsInAction"> <result type="json" name="success"></result> </action> </package> </struts>表现层 json ajax jquery
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>注册UserInfo</title>
<script type="text/javascript" src="js/jquery-1.4.2.js"></script>
<script type="text/javascript">
$(function(){
$("#username").mouseleave(function(){
var username=$("#username").val();
//alert("username="+username);
if(username==""){
$("#msg").html("用户名不为空");
return ;
}
$.ajax({
url:'isIn.action',
type:'POST',
data:"username="+username,
dataType:'json',
success:function (data) {
$("#msg").html(data.msg);
}
});
$("#username").keydown(function(){
$("#msg").html(null);
});
});
});
</script>
</head>
<body>
<form action="ajax.do" method="post">
<p>用户名:<input type="text" name="username" id="username"/><div id="msg"></div> </p>
<p>密码:<input type="password" name="password" id="password"/></p>
<p><input type="button" name="login" id="login" value="登陆"/></p>
</form>
</body>
</html>
标签：用户名存在与否校验 mybatis struts ajax json
原文地址：http://blog.csdn.net/zhanglu1236789/article/details/45012387
