前面基本的配置和工具类都差不多搞定了,如果有缺少在代码看到也不难理解了,下面来讲一个小例子,迅速让你理解ssm开发。
controller就是spring的控制器,所有前端的ajax的入口就在这,ajax怎么进来呢?
我就讲讲一个跳转到增加会议界面,和创建会议的方法:
@RequestMapping(value = "/addMeeting")
public ModelAndView addMeeting(String userid){
Map<String,Object> data = new HashMap<String,Object>();
data.put("userid",userid);
ModelAndView mav = new ModelAndView("/meeting/meeting_add",data);
return mav;
}
这里应该很简单易懂,注意下”/meeting/meeting_add”这个路径,就是跳转到WEB-INF/jsp/meeting/meeting_add.jsp。这个我前面SSM架构有讲过,在spring配置中限制了跳转文件夹。
在jsp中接受参数就用:
<%
String code = request.getParameter("code");
String userid = request.getParameter("userid");
%>
<script>
var wechat_code = '<%=code%>';
var wechat_userid = '<%=userid%>';
</script>
注意一点,这里带了单引号,不然要报错,后面判断它是否null的时候,要和带单引号的null字符串比较。如wechat_code!=’null’不然你会发现怎么都不是null。
@Controller
@RequestMapping("/meeting")
public class MeetingController {
@RequestMapping(value="/roomCreate",method = RequestMethod.POST)
public @ResponseBody String roomCreate(HttpServletRequest request,@RequestBody Room room) throws Exception{
room.setRoom_uuid(Uuid.getUUID());
meetingService.roomCreate(room);
return "11111";
}`
先讲讲ajax怎么跳转到这里的:
$.ajax({
type:"POST",
contentType:"application/json",
url:getRootPath()+"meeting/roomCreate.do",
data:JSON.stringify(sub_results),
success:function(data){
$toast.find('p').html("保存成功");
$toast.fadeIn(100);
setTimeout(function () {
$toast.fadeOut(100);
window.location.href = getRootPath() + "meeting/init.do";
}, 2000);
},
error:function(){
$toast.find('p').html("保存失败");
$toast.fadeIn(100);
setTimeout(function () {
$toast.fadeOut(100);
window.location.href = getRootPath() + "meeting/init.do";
}, 2000);
}
});
参数类型先,contentType:”application/json”,这是申明传出参数是json,dataType:”application/json”是申明传入参数是json,不然默认是application/x-www-form-urlencoded; charset=utf-8”,后台讲无法用,@RequestBody Room room讲json直接放入Room对象中。具体区别用法,可以查阅相关资料,我这里就提点一下。前面我讲过要事先这种json解析进入对象需要的一些配置。
url:getRootPath()+"meeting/roomCreate.do",。getRootPath()是我封装的拿到项目的根目录。如下:
//js获取项目根路径,如: http://localhost:8083/uimcardprj
function getRootPath(){
//获取当前网址,如: http://localhost:8083/uimcardprj/share/meun.jsp
var curWwwPath=window.document.location.href;
//获取主机地址之后的目录,如: uimcardprj/share/meun.jsp
var pathName=window.document.location.pathname;
var pos=curWwwPath.indexOf(pathName);
//获取主机地址,如: http://localhost:8083
var localhostPaht=curWwwPath.substring(0,pos);
//获取带"/"的项目名,如:/uimcardprj
var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1);
return(localhostPaht+projectName+"/");
}
然后再回到spring的入口controller。注意点再放到上面那个项目结构的图片。
controller调了meetingService.roomCreate(room);就是服务层,类似于以前传统写法的DAO层,imp里面放的是service层的实现类。meetingService采用Spring注入的方式。如下:
@Autowired
private MeetingService meetingService;
sevice层结构如下:
一个抽象类,一个实现类,实现类中逻辑如下:
@Service
public class MeetingServiceImp implements MeetingService{
@Autowired
private MeetingMapper meetingMapper;
public void roomCreate(Room room) {
meetingMapper.roomCreate(room);
}
}
如果要补充一些逻辑就在roomCreate方法中加。meetingMapper是mybatis层了,来处理数据对象的存储。结构如下:
MeetingMapper.java是接口类,定义给mybatis查找的方法如下:
public interface MeetingMapper {
/**
* 创建会议室
* @param room
*/
public void roomCreate(Room room);
}
MeetingMapper.xml是实现mybatis的具体数据库存储语言的。直接上代码:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.supcon.mo.common.meeting.data.MeetingMapper">
<insert id="roomCreate" parameterType="Room">
INSERT INTO `meeting_room`
<trim prefix="(" suffix=")" suffixOverrides=",">
`room_uuid`,
`room_name`,
`room_city`,
`office_building`,
`person_hold`,
`equipment_tools`,
`optional_stime`,
`optional_etime`,
<if test="is_examine != null">
`is_examine`,
</if>
`user_ids`,
<if test="is_freeze != null">
`Is_freeze`,
</if>
`freeze_cause`,
<if test="is_delete != null">
`Is_delete`,
</if>
`Create_time`,
`Modify_time`,
`Create_person`,
`Modify_person`
</trim>
<trim prefix="VALUES (" suffix=")" suffixOverrides=",">
#{room_uuid},
#{room_name},
#{room_city},
#{office_building},
#{person_hold},
#{equipment_tools},
#{optional_stime},
#{optional_etime},
<if test="is_examine != null">
#{is_examine},
</if>
#{user_ids},
<if test="is_freeze != null">
#{is_freeze},
</if>
#{freeze_cause},
<if test="is_delete != null">
#{is_delete},
</if>
now(),
#{modify_time},
#{create_person},
#{modify_person}
</trim>
</insert>
mybatis的具体语法我就不介绍了。网上一大堆,我就告诉你们一个整体的SSM的流程。在附上我建立的Room数据库:
create table meeting_room(
room_uuid Varchar(32) primary key,
room_name Varchar(50) not null,
room_city Varchar(4) not null,
office_building Varchar(4) not null,
person_hold Int(4) not null,
equipment_tools Varchar(100),
optional_stime varchar(10) not null,
optional_etime varchar(10) not null,
is_examine Varchar(1) not null default '0',
user_ids Text,
Is_freeze Varchar(1) not null default '0',
freeze_cause Varchar(300),
Is_delete Varchar(1) not null default '0',
Create_time DATETIME not null,
Modify_time DATETIME,
Create_person Varchar(32) not null,
Modify_person Varchar(32)
);
怎么测试呢?
直接在前端页面做一个按钮,然后自己拼一个json对象,调用上边的ajax传到后台去存储,然后再数据库看是否存储成功。
<button onclick=save()>
<script>
function save(){
var sub_results = {};
sub_results.room_name = ""
sub_results.room_city = "";
sub_results.office_building = "";
sub_results.person_hold = "";
sub_results.equipment_tools = "";
sub_results.optional_stime = "08:00";
sub_results.optional_etime = "17:00";
sub_results.create_person = user_id;
_is_examine?sub_results.is_examine = "0"
}
</script>
在上述的ajax的data中放入sub_results;不过要将json转化为字符串:JSON.stringify(sub_results);
好了。大概都是这么多,如有什么问题可在下边留言,后面将会讲更深层次的东西,前面简单化的必须要看懂。不然后边会不明所以!