汉字搜索效果图：
拼音首字母搜索效果图：
1）数据库表及函数(SQL Server 2008)
先来建立数据库表City，它包含两个字段CityID，CityName。
CREATE TABLE City
(
CityID INT IDENTITY(1,1) Primary KEY , --城市主键
CityName NVARCHAR(50) NOT NULL, --城市名称
)
然后再插入一些示例数据
INSERT City(CityName) Values('北京市')
INSERT City(CityName) Values('天津市')
INSERT City(CityName) Values('上海市')
INSERT City(CityName) Values('重庆市')
INSERT City(CityName) Values('邯郸市')
INSERT City(CityName) Values('石家庄市')
INSERT City(CityName) Values('保定市')
INSERT City(CityName) Values('张家口市')
INSERT City(CityName) Values('承德市')
INSERT City(CityName) Values('唐山市')
//省略...从表结构及示例数据来看，这里没有城市名称拼音首字母字段，那如何完成拼音搜索呢？不要着急，这得在数据库中建立一个函数，用来返回汉字的拼音首字母。
create function f_GetPy(@str nvarchar(4000))
returns nvarchar(4000)
as
begin
declare @strlen int,@re nvarchar(4000)
declare @t table(chr nchar(1) collate Chinese_PRC_CI_AS,letter nchar(1))
insert into @t(chr,letter)
select '吖', 'A ' union all select '八', 'B ' union all
select '嚓', 'C ' union all select '咑', 'D ' union all
select '妸', 'E ' union all select '发', 'F ' union all
select '旮', 'G ' union all select '铪', 'H ' union all
select '丌', 'J ' union all select '咔', 'K ' union all
select '垃', 'L ' union all select '嘸', 'M ' union all
select '拏', 'N ' union all select '噢', 'O ' union all
select '妑', 'P ' union all select '七', 'Q ' union all
select '呥', 'R ' union all select '仨', 'S ' union all
select '他', 'T ' union all select '屲', 'W ' union all
select '夕', 'X ' union all select '丫', 'Y ' union all
select '帀', 'Z '
select @strlen=len(@str),@re= ' '
while @strlen> 0
begin
select top 1 @re=letter+@re,@strlen=@strlen-1
from @t a where chr <=substring(@str,@strlen,1)
order by chr desc
if @@rowcount=0
select @re=substring(@str,@strlen,1)+@re,@strlen=@strlen-1
end
return(@re)
end
如果调用f_GetPy('北京')，则返回拼音首字母 'bj'
2）前台页面
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link href="../js/jquery-ui/jquery-ui.min.css" rel="stylesheet" type="text/css"/>
<style>
.ui-autocomplete {
max-height: 100px;
overflow-y: auto;
/* prevent horizontal scrollbar */
overflow-x: hidden;
}
/* IE 6 doesn't support max-height
* we use height instead, but this forces the menu to always be this tall
*/
* html .ui-autocomplete {
height: 100px;
}
</style>
<script type="text/javascript" src="../js/jquery-ui/jquery-1.9.0.min.js"></script>
<script type="text/javascript" src="../js/jquery-ui/jquery-ui.min.js"></script>
<script type="text/javascript">
$( "#cityNameId" ).focus(function(){
//智能提示
$( "#cityNameId" ).autocomplete({
source:function(request,response){
$.ajax({
type:"POST",
url:"../cityManage/showTipsByCityName.action",
dataType:"json",
cache : false,
async: false,
data : {
"cityName": $("#cityNameId").val(),
},
success:function(json){
response($.map(json.autoSuggests,function(item){
return {
label:item,
value:item
};
}));
}
});
}
});
});
</script>
</head>
<body>
城市名称：
<div class="ui-widget" style="display:inline">
<input type ="text" id="cityNameId" name="cityName" >
</div>
</body>
</html>
cityName的值提交到服务器，作为搜索关键字。为了实现Ajax智能提示，需要用到JQuery UI AutoComplete插件，它要求返回JSON格式的数据。所以，下一步就是要在Action中返回JSON数据。
3)ACTION层
package com.dong.action; import java.util.ArrayList;
import java.util.List;
import org.apache.struts2.json.annotations.JSON;
import com.dong.po.City;
import com.dong.service.ICityService;
import com.opensymphony.xwork2.ActionSupport; /**
* 城市搜索Action
* @version 1.0 2013/01/12
* @author dongliyang
*
*/
public class CityAction extends ActionSupport{ /** SerialVersionUID*/
private static final long serialVersionUID = -8042695641942800870L;
/** 城市Service */
private ICityService cityService;
/** 搜索关键字，城市名称 */
private String cityName;
/** 城市列表 */
private List<City> cityList;
/** 智能提示列表，以JSON数据格式返回 */
private List<String> autoSuggests = new ArrayList<String>(); /**
* 智能提示，自动补全功能
* @return String
*/
public String autoComplete(){ cityList = cityService.findByName(cityName); for(City city : cityList){
autoSuggests.add(city.getCityName());
} return SUCCESS;
} public void setCityService(ICityService cityService) {
this.cityService = cityService;
} //搜索关键字不作为JSON数据返回，设置serialize=false
@JSON(serialize=false)
public String getCityName() {
return cityName;
} public void setCityName(String cityName) {
this.cityName = cityName;
} //搜索结果列表不作为JSON数据返回，设置serialize=false
@JSON(serialize=false)
public List<City> getCityList() {
return cityList;
} public void setCityList(List<City> cityList) {
this.cityList = cityList;
} //智能提示列表作为JSON数据返回，设置serialize=true
@JSON(serialize=true)
public List<String> getAutoSuggests() {
return autoSuggests;
} public void setAutoSuggests(List<String> autoSuggests) {
this.autoSuggests = autoSuggests;
}
}
4）DAO层
package com.dong.dao.impl; import java.util.List; import com.dong.dao.ICityDao;
import com.dong.framework.BaseDao;
import com.dong.po.City; public class CityDaoImpl extends BaseDao<City> implements ICityDao { /**
* 根据名称或拼音搜索城市
* @param cityName
* @return List<City> 城市列表
*/
public List<City> findByName(String cityName){ String hql = "from City c where c.cityName like ? or dbo.f_GetPy(c.cityName) like ?";
return find(hql, "%" + cityName + "%",cityName + "%"); } }
hql语句中，使用cityName和f_GetPy(cityName) 来跟关键字进行like匹配。
比如：汉字搜索时，关键字"北京"传入方法，hql where子句中的c.cityName将能够匹配。
拼音搜索时，关键字"BJ"传入方法，hql where子句中的dbo.f_GetPy(c.cityName)将能够匹配。
5）struts.xml配置
<package name="cityManage" namespace="/cityManage" extends="json-default">
<action name="showTipsByCityName" class="cityAction" method="autoComplete">
<result name="success" type="json"></result>
</action>
</package>
备注：
如果城市名称有重名的可能性，那么我们就要考虑在前台页面加上一个hidden存放与之对应的编码。在这种情况下，我们需要修改前台页面html，action层。
（1）首先我们需要把前台html的页面修改为：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link href="../js/jquery-ui/jquery-ui.min.css" rel="stylesheet" type="text/css"/>
<style>
.ui-autocomplete {
max-height: 100px;
overflow-y: auto;
/* prevent horizontal scrollbar */
overflow-x: hidden;
}
/* IE 6 doesn't support max-height
* we use height instead, but this forces the menu to always be this tall
*/
* html .ui-autocomplete {
height: 100px;
}
</style>
<script type="text/javascript" src="../js/jquery-ui/jquery-1.9.0.min.js"></script>
<script type="text/javascript" src="../js/jquery-ui/jquery-ui.min.js"></script>
<script type="text/javascript">
$( "#cityNameId" ).focus(function(){
//智能提示
$( "#cityNameId" ).autocomplete({
source:function(request,response){
$.ajax({
type:"POST",
url:"../cityManage/showTipsByCityName.action",
dataType:"json",
cache : false,
async: false,
data : {
"cityName": $("#cityNameId").val(),
},
success:function(json){
response($.map(json.autoSuggests,function(item){
return {
label:item.cityName,
value:item.cityName,
id:item.cityId
};
}));
}
});
},
select:function( event, ui ) {
$("#cityId").val(ui.item.id);
}
});
});
</script>
</head>
<body>
城市名称：
<div class="ui-widget" style="display:inline">
<input type ="text" id="cityNameId" name="cityName" />
<input type="hidden" id="cityCode" />
</div>
</body>
</html>
（2）action层修改为：
package com.dong.action; import java.util.ArrayList;
import java.util.List;
import org.apache.struts2.json.annotations.JSON;
import com.dong.po.City;
import com.dong.service.ICityService;
import com.opensymphony.xwork2.ActionSupport; /**
* 城市搜索Action
* @version 1.0 2013/01/12
* @author dongliyang
*
*/
public class CityAction extends ActionSupport{ /** SerialVersionUID*/
private static final long serialVersionUID = -8042695641942800870L;
/** 城市Service */
private ICityService cityService;
/** 搜索关键字，城市名称 */
private String cityName;
/** 智能提示列表，以JSON数据格式返回 */
private List<City> autoSuggests = new ArrayList<City>(); /**
* 智能提示，自动补全功能
* @return String
*/
public String autoComplete(){ autoSuggests = cityService.findByName(cityName);
return SUCCESS;
} public void setCityService(ICityService cityService) {
this.cityService = cityService;
} //搜索关键字不作为JSON数据返回，设置serialize=false
@JSON(serialize=false)
public String getCityName() {
return cityName;
} public void setCityName(String cityName) {
this.cityName = cityName;
} //智能提示列表作为JSON数据返回，设置serialize=true
@JSON(serialize=true)
public List<City> getAutoSuggests() {
return autoSuggests;
} public void setAutoSuggests(List<City> autoSuggests) {
this.autoSuggests = autoSuggests;
}
}
参考资料：
1.参考资料：http://www.cnblogs.com/dongliyang/archive/2013/01/20/2868699.html
2.获取汉字拼音首字母的函数，来自：http://www.cnblogs.com/wuhuacong/archive/2010/01/25/1655916.html