技术教程 空气质量管理系统+SSM(Spring+SpringMVC+Mybatis)+前后端分离总结 正文

空气质量管理系统+SSM(Spring+SpringMVC+Mybatis)+前后端分离总结

2022-10-12,,,,

作者:故事我忘了￠
个人微信公众号:程序猿的月光宝盒

点我进ssm演示地址

1.目录结构:

2.需要注意的地方

2.1在web-info下新建

2.1.1 springmvc-servlet.xml

<?xml version="1.0" encoding="utf-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemalocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
    <context:component-scan base-package="monster._52cc"/>
    <bean id="datasource" class="org.springframework.jdbc.datasource.drivermanagerdatasource">
        <property name="driverclassname" value="com.mysql.jdbc.driver"/>
        <property name="url" value="jdbc:mysql:///kh75?useunicode=true&amp;characterencoding=utf-8"/>
        <property name="username" value="root"/>
        <property name="password" value="admin"/>
    </bean>
    <bean id="sqlsessionfactory" class="org.mybatis.spring.sqlsessionfactorybean">
        <property name="datasource" ref="datasource"/>
        <property name="typealiasespackage" value="monster._52cc.pojo"/>
        <property name="typealiases" value="monster._52cc.util.pageutils"/>
    </bean>
    <bean id="transactionmanager" class="org.springframework.jdbc.datasource.datasourcetransactionmanager">
        <property name="datasource" ref="datasource"/>
    </bean>
    <tx:annotation-driven/>
    <bean class="org.mybatis.spring.mapper.mapperscannerconfigurer">
        <property name="basepackage" value="monster._52cc.mapper"/>
    </bean>
    <!--这是从controller层使用@restcontroller注解引起从数据库到前台时间出现long类型的时间(从1970-1-1至今的毫秒),解决springmvc 中@restcontroller 返回日期格式为时间戳-->
    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.json.mappingjackson2httpmessageconverter">
                <property name="objectmapper">
                    <bean class="com.fasterxml.jackson.databind.objectmapper">
                        <property name="dateformat">
                            <bean class="java.text.simpledateformat">
                                <constructor-arg type="java.lang.string" value="yyyy-mm-dd hh:mm:ss"/>
                            </bean>
                        </property>
                    </bean>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>
</beans>

2.1.2 web.xml

<!doctype web-app public
        "-//sun microsystems, inc.//dtd web application 2.3//en"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>archetype created web application</display-name>
    <filter>
        <filter-name>encodingfilter</filter-name>
        <filter-class>org.springframework.web.filter.characterencodingfilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingfilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.dispatcherservlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    <welcome-file-list>
        <welcome-file>list.html</welcome-file>
    </welcome-file-list>
</web-app>

2.2实体类,对应数据库中data的字段上加注解 @datetimeformat(pattern = "yyyy-mm-dd")

@data
@allargsconstructor
@noargsconstructor
public class airqualityindex {
    /**
    * 记录编号
    */
    private integer id;

    /**
    * 区域编号
    */
    private integer districtid;

    /**
    * 检测时间
    */
    @datetimeformat(pattern = "yyyy-mm-dd")
    private date monitortime;

    /**
    * pm10值
    */
    private integer pm10;

    /**
    * pm2.5值
    */
    private integer pm2_5;

    /**
    * 监测站
    */
    private string monitoringstation;

    /**
    * 最后修改时间
    */
    private string lastmodifytime;
}

2.3 暂时没有用到mybatis的分页插件,所以自己写分页工具类

@tostring
public class pageutils {
    private integer pagesize;
    private integer pageno;
    private integer totalcount;
    private integer totalpages;
    private integer startrow;
    /**
     * 需要分页的对象
     */
    private airqualityindex airqualityindex;

    public pageutils() {
    }

    public pageutils(integer pagesize, integer pageno, integer totalcount, airqualityindex airqualityindex) {
        this.pagesize = pagesize;
        this.pageno = pageno;
        this.totalcount = totalcount;
        this.airqualityindex = airqualityindex;

        setstartrow(pagesize,pageno);
        settotalpages(pagesize,totalcount);
    }

    public integer getpagesize() {
        return pagesize;
    }

    public void setpagesize(integer pagesize) {
        this.pagesize = pagesize;
    }

    public integer getpageno() {
        return pageno;
    }

    public void setpageno(integer pageno) {
        this.pageno = pageno;
    }

    public integer gettotalcount() {
        return totalcount;
    }

    public void settotalcount(integer totalcount) {
        this.totalcount = totalcount;
    }

    public integer gettotalpages() {
        return totalpages;
    }

    public void settotalpages(integer pagesize,integer totalcount) {
        this.totalpages = totalcount%pagesize==0?totalcount/pagesize:totalcount/pagesize+1;
    }

    public integer getstartrow() {
        return startrow;
    }

    public void setstartrow(integer pagesize,integer pageno) {
        this.startrow = (pageno-1)*pagesize;
    }

    public airqualityindex getairqualityindex() {
        return airqualityindex;
    }

    public void setairqualityindex(airqualityindex airqualityindex) {
        this.airqualityindex = airqualityindex;
    }
}

2.4 省去mapper的xml,使用注解写sql

注意查询的动态sql上要用<script></script>包起来

airqualityindexmapper.java

public interface airqualityindexmapper {

    @delete("delete from air_quality_index where id = #{id}")
    int deletebyprimarykey(integer id);

    @insert("insert into air_quality_index values (null,#{districtid}, #{monitortime}, #{pm10}, #{pm2_5}, #{monitoringstation}, #{lastmodifytime})")
    int insert(airqualityindex airqualityindex);

    @update("update air_quality_index set districtid = #{districtid},monitortime = #{monitortime},pm10 = #{pm10},pm2_5 = #{pm2_5},monitoringstation = #{monitoringstation},lastmodifytime = #{lastmodifytime} where id = #{id}")
    int updatebyprimarykey(airqualityindex airqualityindex);

    @select("<script>" +
            "select a.*,d.name from air_quality_index a,district d where a.districtid = d.id" +
            "<if test='airqualityindex != null and airqualityindex.id != null'>" +
            "  and a.id=#{airqualityindex.id}" +
            "</if>" +
            "<if test='airqualityindex != null and airqualityindex.districtid != -1 and airqualityindex.districtid != null'>" +
            "  and a.districtid=#{airqualityindex.districtid}" +
            "</if>" +
            "<if test='pagesize != null and startrow != null'>" +
            "  limit #{startrow},#{pagesize}" +
            "</if>" +
            "</script>")
    list<map<string,object>> selectbyprimarykey(pageutils pageutils);

    @select("<script>" +
            "  select count(0) from air_quality_index" +
            "  <where>" +
            "    <if test='districtid != null and districtid != -1'>" +
            "        and districtid=#{districtid}" +
            "    </if>" +
            "  </where>" +
            "</script>")
    int gettotalcount(airqualityindex airqualityindex);
}

2.5 service中要注意的事情

2.5.1因为分页逻辑属于service要做的事,所以贴上对应serviceimp中的逻辑

airqualityindexserviceimpl.java中的selectbyprimarykey(pageutils pageutils)

@service
@transactional
public class airqualityindexserviceimpl implements airqualityindexservice {
    @autowired
    private airqualityindexmapper airqualityindexmapper;

    @override
    public int deletebyprimarykey(integer id) {
        return airqualityindexmapper.deletebyprimarykey(id);
    }

    @override
    public int insert(airqualityindex airqualityindex) {
        //todo获取当前系统时间
        date d = new date();
        simpledateformat sdf = new simpledateformat("yyyy-mm-dd hh:mm:ss");
        //2019-10-23 10:31:37
        airqualityindex.setlastmodifytime(sdf.format(d));
        if (airqualityindex.getdistrictid() == -1) {
            return 0;
        }
        return airqualityindexmapper.insert(airqualityindex);
    }

    @override
    public int updatebyprimarykey(airqualityindex airqualityindex) {
        //todo获取当前系统时间
        date d = new date();
        simpledateformat sdf = new simpledateformat("yyyy-mm-dd hh:mm:ss");
        //2019-10-23 10:31:37
        //设置时区
        sdf.settimezone(timezone.gettimezone("asia/shanghai"));
        airqualityindex.setlastmodifytime(sdf.format(d));
        if (airqualityindex.getdistrictid() == -1) {
            return 0;
        }
        system.out.println(airqualityindex);
        return airqualityindexmapper.updatebyprimarykey(airqualityindex);
    }

    @override
    public list<map<string, object>> selectbyprimarykey(pageutils pageutils) {
        if(pageutils.getpageno()==null){
            return airqualityindexmapper.selectbyprimarykey(pageutils);
        }
        pageutils.settotalcount(airqualityindexmapper.gettotalcount(pageutils.getairqualityindex()));
        pageutils.setpagesize(5);
        pageutils.settotalpages(pageutils.getpagesize(), pageutils.gettotalcount());
        pageutils.setstartrow(pageutils.getpagesize(), pageutils.getpageno());
        return airqualityindexmapper.selectbyprimarykey(pageutils);
    }
}

2.5.2其中,因为要实时保存修改时间,所以也在service中实现

//todo获取当前系统时间
        date d = new date();
        simpledateformat sdf = new simpledateformat("yyyy-mm-dd hh:mm:ss");
        //2019-10-23 10:31:37
        //设置时区
        sdf.settimezone(timezone.gettimezone("asia/shanghai"));
        airqualityindex.setlastmodifytime(sdf.format(d));
        if (airqualityindex.getdistrictid() == -1) {
            return 0;
        }
        system.out.println(airqualityindex);

2.6最终的controller文件

centercontrollerofair.java

@restcontroller
public class centercontrollerofair{
    @autowired
    private airqualityindexservice airqualityindexservice;
    @autowired
    private districtservice districtservice;

    @requestmapping("/deletebyprimarykey.do")
    public int deletebyprimarykey(integer id) {
        return airqualityindexservice.deletebyprimarykey(id);
    }

    @requestmapping("/insert.do")
    public int insert(airqualityindex airqualityindex) {
        if(airqualityindex.getdistrictid()==-1 || airqualityindex.getmonitoringstation()==null || airqualityindex.getmonitortime()==null || airqualityindex.getpm2_5()==null || airqualityindex.getpm10()==null){
            return 0;
        }
        return airqualityindexservice.insert(airqualityindex);
    }

    @requestmapping("/updatebyprimarykey.do")
    public int updatebyprimarykey(airqualityindex airqualityindex) {
        if(airqualityindex.getdistrictid()==-1 || airqualityindex.getmonitoringstation()==null || "".equals(airqualityindex.getmonitoringstation().trim()) || airqualityindex.getmonitortime()==null || airqualityindex.getpm2_5()==null || airqualityindex.getpm10()==null){
            return 0;
        }
        return airqualityindexservice.updatebyprimarykey(airqualityindex);
    }

    @requestmapping("/selectbyprimarykey.do")
    public map<string, object> selectbyprimarykey(pageutils pageutils) {
        map<string, object> map = new hashmap<>(16);
        list<map<string, object>> airqualityindexlist = airqualityindexservice.selectbyprimarykey(pageutils);
        map.put("airqualityindexlist",airqualityindexlist);
        map.put("pageutils",pageutils);
        return map;
    }

    @requestmapping("/showalldistrict.do")
    public list<map<string, object>> showalldistrict() {
        return districtservice.showalldistrict();
    }

    @requestmapping("/info.do")
    public map<string, object> info(pageutils pageutils) {
        map<string, object> map = new hashmap<>(16);
        map.put("airqualityindex",airqualityindexservice.selectbyprimarykey(pageutils).get(0));
        map.put("optiondata",districtservice.showalldistrict());
        return map;
    }
}

2.7对应的几个页面要注意的:

list.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>title</title>
</head>
<body>
<center>
    <h1>空气质量监测信息库</h1>
    <form id="seldistrictform">
    按区域查询
        <select name="districtid" id="seldistrictsel" title="区域查询">
            <option value="-1">不限</option>
        </select>
        <input type="button" name="sel" value="查找"/>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <a href="add.html">添加空气质量信息</a>
    </form>
    <br/>
    <table>
        <tr>
            <th>序号</th>
            <th>区域</th>
            <th>监测时间</th>
            <th>pm10</th>
            <th>pm2.5</th>
            <th>监测站</th>
        </tr>
    </table>
    <p class="pagefoot"></p>
</center>
<script rel="script" type="text/javascript" src="js/jquery-1.11.2.min.js"></script>
<script rel="script" type="text/javascript" src="js/initoptionsel.js"></script>
<script rel="script" type="text/javascript" src="js/list.js"></script>
</body>
</html>

list.js

$(function () {
    // 初始化分页数据
    initpagedata(1);
    //条件查找
    $("[type=button]").click(function () {
        initpagedata(1);
    });

});



function initpagedata(pageno) {
    var table = $("table");
    var pagefoot = $("[class=pagefoot]");
    var districtid = $("[name=districtid]").val();
    $.ajax({
        url: "selectbyprimarykey.do",
        type: "post",
        datatype: "json",
        data: {"pageno": pageno, "airqualityindex.districtid": districtid},
        async: true,
        success: function (obj) {
            var tablestr = "";
            console.log(obj.airqualityindexlist.length===0);
            if (obj.airqualityindexlist.length===0){
                $("tr:gt(0)").remove();
                tablestr=`
                <tr style="text-align: center">
                    <td colspan="6"><strong>抱歉,暂无数据</strong></td>
                </tr>
                `;
            }else{
                //在循环的前面清空标题以下的所有行
                //获取行>0的那行.移除方法
                $("tr:gt(0)").remove();
                $.each(obj.airqualityindexlist, function (i) {
                    tablestr += `
                <tr>
                  <td>${obj.airqualityindexlist[i].id}</td>
                  <td> <a href="edit.html?id=${obj.airqualityindexlist[i].id}">${obj.airqualityindexlist[i].name}</a></td>
                  <td>${obj.airqualityindexlist[i].monitortime}</td>
                  <td>${obj.airqualityindexlist[i].pm10}</td>
                  <td>${obj.airqualityindexlist[i].pm2_5}</td>
                  <td>${obj.airqualityindexlist[i].monitoringstation}</td>
                </tr>
                `;
                });
            }
            table.attr("width", "600");
            table.append(tablestr);
            $("tr").first().attr("style", "background-color:#add8e6");
            $("tr:gt(0):odd").attr("style", "background-color:#90ee90");

            //分页
            //在分页前,清空原来分页的内容
            pagefoot.html("");
            var pagestr = "";
            if(obj.pageutils.totalcount===0){//如果没有数据,就不显示分页条
                return ;
            }
            if (obj.pageutils.pageno === 1 && obj.pageutils.pageno !== obj.pageutils.totalpages) {//如果是第一页,并且还有下一页
                pagestr = `
                <a href="javascript:void(0);" style="text-decoration: none;color: grey;cursor:no-drop;">首&nbsp;页</a>|
                <a href="javascript:void(0);" style="text-decoration: none;color: grey;cursor:no-drop;"><< 上一页</a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.pageno + 1 });">下一页>></a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.totalpages});">尾&nbsp;页</a>
                `
            }else if (obj.pageutils.pageno === 1 && obj.pageutils.pageno !== obj.pageutils.totalpages) {//如果是第一页,并且没有有下一页
                pagestr = ``//nothing to do
            }else if(obj.pageutils.pageno !== 1 && obj.pageutils.pageno !== obj.pageutils.totalpages){//如果不是第一页,并且还有下一页
                pagestr = `
                <a href="javascript:void(0);" onclick="initpagedata(1)">首&nbsp;页</a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.pageno - 1 });"><< 上一页</a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.pageno + 1 });">下一页>></a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.totalpages});">尾&nbsp;页</a>
                `
            }else if(obj.pageutils.pageno !== 1 && obj.pageutils.pageno === obj.pageutils.totalpages){//如果不是第一页,且是最后一页
                pagestr = `
                <a href="javascript:void(0);" onclick="initpagedata(1)">首&nbsp;页</a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.pageno - 1 })"><< 上一页</a>|
                <a href="javascript:void(0);" style="text-decoration: none;color: grey;cursor:no-drop;">下一页>></a>|
                <a href="javascript:void(0);" style="text-decoration: none;color: grey;cursor:no-drop;">尾&nbsp;页</a>
                `
            }
            pagestr += `
            第&nbsp;
                ${obj.pageutils.pageno}
                页/共
                ${obj.pageutils.totalpages}
                页(${obj.pageutils.totalcount}条)
            `;
            pagefoot.append(pagestr);
        },
        error: function () {
            alert("initpagedata error");
        }
    })
}

2.7.1其中,分页逻辑可以以后稍作修改直接使用

            //分页
            //在分页前,清空原来分页的内容
            pagefoot.html("");
            var pagestr = "";
            if(obj.pageutils.totalcount===0){//如果没有数据,就不显示分页条
                return ;
            }
            if (obj.pageutils.pageno === 1 && obj.pageutils.pageno !== obj.pageutils.totalpages) {//如果是第一页,并且还有下一页
                pagestr = `
                <a href="javascript:void(0);" style="text-decoration: none;color: grey;cursor:no-drop;">首&nbsp;页</a>|
                <a href="javascript:void(0);" style="text-decoration: none;color: grey;cursor:no-drop;"><< 上一页</a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.pageno + 1 });">下一页>></a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.totalpages});">尾&nbsp;页</a>
                `
            }else if (obj.pageutils.pageno === 1 && obj.pageutils.pageno !== obj.pageutils.totalpages) {//如果是第一页,并且没有有下一页
                pagestr = ``//nothing to do
            }else if(obj.pageutils.pageno !== 1 && obj.pageutils.pageno !== obj.pageutils.totalpages){//如果不是第一页,并且还有下一页
                pagestr = `
                <a href="javascript:void(0);" onclick="initpagedata(1)">首&nbsp;页</a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.pageno - 1 });"><< 上一页</a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.pageno + 1 });">下一页>></a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.totalpages});">尾&nbsp;页</a>
                `
            }else if(obj.pageutils.pageno !== 1 && obj.pageutils.pageno === obj.pageutils.totalpages){//如果不是第一页,且是最后一页
                pagestr = `
                <a href="javascript:void(0);" onclick="initpagedata(1)">首&nbsp;页</a>|
                <a href="javascript:void(0);" onclick="initpagedata(${obj.pageutils.pageno - 1 })"><< 上一页</a>|
                <a href="javascript:void(0);" style="text-decoration: none;color: grey;cursor:no-drop;">下一页>></a>|
                <a href="javascript:void(0);" style="text-decoration: none;color: grey;cursor:no-drop;">尾&nbsp;页</a>
                `
            }
            pagestr += `
            第&nbsp;
                ${obj.pageutils.pageno}
                页/共
                ${obj.pageutils.totalpages}
                页(${obj.pageutils.totalcount}条)
            `;
            pagefoot.append(pagestr);

initoptionsel.js

初始化下拉列表

$(function () {
    //初始化查询下啦列表
    initseloption();}
);
function initseloption() {
    $.ajax({
        url: "showalldistrict.do",
        type: "post",
        datatype: "json",
        data: {},
        async: true,
        success: function (obj) {
            var str = "";
            $.each(obj, function (i) {
                str += `
               <option value="${obj[i].id}">${obj[i].name}</option>
               `
            });
            //获取下拉列表
            $("#seldistrictsel").append(str);
        },
        error: function () {
            alert("initseloption error");
        }
    })
}

以上,结束

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