SSM整合——增删改查
最近刚学完ssm，我从maven工程建完开始整合ssm并完成基于layui数据表格的增删改查，记录一下。
第一步 导入坐标 pom.xml
导入我们需要的坐标，包括spring、servlet、mysql、日志等。
<dependencies>
<!--spring相关-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.7</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<!--servlet和jsp-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.0</version>
</dependency>
<!--mybatis相关-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.0</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.3</version>
</dependency>
<!-- 添加slf4j日志api -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.20</version>
</dependency>
<!-- 添加logback-classic依赖 -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
<!-- 添加logback-core依赖 -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.2.3</version>
</dependency>
</dependencies>
第二步我习惯建数据库表，这里我用的是mysql 8.0.26。数据库ssm 表 student
这里id和num都是主键，id是自增的，num作为学号也是主键。
第三步根据数据库表，建立domain包，并建立实体类Student
只对一个表进行增删改查，所以只创建了一个实体类。
package com.wjb.domain;
import java.util.Date;
public class Student {
private int id;
private String num;
private String name;
private String sex;
private String birthday;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", num='" + num + '\'' +
", name='" + name + '\'' +
", sex='" + sex + '\'' +
", birthday=" + birthday +
'}';
}
}
第三步 配置文件配置过程在resources下
一、Spring配置文件 ApplicationContext.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:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.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">
<!--组件扫描 扫描service和mapper-->
<context:component-scan base-package="com.wjb">
<!--排除controller的扫描-->
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:exclude-filter>
</context:component-scan>
<!--加载propeties文件-->
<context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
<!--配置数据源信息-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!--配置sessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<!--加载mybatis核心文件-->
<property name="configLocation" value="classpath:sqlMapConfig-spring.xml"></property>
</bean>
<!--扫描mapper所在的包 为mapper创建实现类-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.wjb.mapper"></property>
</bean>
<!--声明式事务控制-->
<!--平台事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!--配置事务增强-->
<tx:advice id="txAdvice">
<tx:attributes>
<tx:method name="*"/>
</tx:attributes>
</tx:advice>
<!--事务的aop织入-->
<aop:config>
<aop:advisor advice-ref="txAdvice" pointcut="execution(* com.wjb.service.impl.*.*(..))"></aop:advisor>
</aop:config>
</beans>
二、springmvc配置 spring-mvc.xml
<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!--组件扫描 主要扫描controller-->
<context:component-scan base-package="com.wjb.controller"></context:component-scan>
<!--配置mvc注解驱动-->
<mvc:annotation-driven></mvc:annotation-driven>
<!--内部资源视图解析器-->
<!-- <bean id="resourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/pages/"></property>
<property name="suffix" value=".jsp"></property>
</bean>-->
<!--开发静态资源访问权限-->
<mvc:default-servlet-handler></mvc:default-servlet-handler>
</beans>
三、Mybatis配置文件 sqlMapConfig.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--定义别名-->
<typeAliases>
<!--<typeAlias type="com.itheima.domain.Account" alias="account"></typeAlias>-->
<package name="com.wjb.domain"></package>
</typeAliases>
</configuration>
四、日志配置文件 logback.xml
<?xml version="1.0" encoding="UTF-8"?> <configuration> <!-- CONSOLE ：表示当前的日志信息是可以输出到控制台的。 --> <appender name="Console" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>[%level] %blue(%d{HH:mm:ss.SSS}) %cyan([%thread]) %boldGreen(%logger{15}) - %msg %n</pattern> </encoder> </appender> <logger name="com.itheima" level="DEBUG" additivity="false"> <appender-ref ref="Console"/> </logger> <!-- level:用来设置打印级别，大小写无关：TRACE, DEBUG, INFO, WARN, ERROR, ALL 和 OFF ， 默认debug <root>可以包含零个或多个<appender-ref>元素，标识这个输出位置将会被本日志级别控制。 --> <root level="DEBUG"> <appender-ref ref="Console"/> </root> </configuration>
五、数据库配置文件抽取 jdbc.properties
jdbc.driver=com.mysql.cj.jdbc.Driver #8.0.26驱动
jdbc.url=jdbc:mysql://localhost:3306/ssm
jdbc.username=root
jdbc.password=root
六、在WEB-INF下配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<!--spring 监听器-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--springmvc的前端控制器-->
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!--乱码过滤器-->
<filter>
<filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
第四步 项目代码
项目结构
这里面需要用到layui的包，引用了layui的样式和js，需要jQuery的包。
一、前端页面 index.html
在一个数据表格中完成增删改查操作，所以只有一个页面就够了。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>学生信息表</title>
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<script type="text/javascript" src="js/vue.min.js"></script>
<script src="js/jquery-3.3.1.js"></script>
<script src="layui/layui.js" charset="utf-8"></script>
<link rel="stylesheet" href="layui/css/layui.css" tppabs="http://res.layui.com/layui/dist/css/layui.css" media="all">
</head>
<body>
<style>
.layertest{
display: none;
}
</style>
<div class="layertest" id="layertest">
<fieldset class="layui-elem-field layui-field-title" style="margin-top: 20px;">
<legend>添加学生信息</legend>
</fieldset>
<div class="layui-form" lay-filter="dataPage">
<div class="layui-form-item">
<label class="layui-form-label">学号</label>
<div class="layui-input-inline">
<input type="text" name="num" id="num" required lay-verify="required" placeholder="请输入学生学号" autocomplete="off" class="layui-input">
</div>
<div class="layui-form-mid layui-word-aux">八位数学号</div>
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">姓名</label>
<div class="layui-input-inline">
<input type="text" id="name" name="name" required lay-verify="required" placeholder="请输入学生姓名" autocomplete="off" class="layui-input">
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">性别</label>
<div class="layui-input-inline">
<input type="text" id="sex" name="sex" required lay-verify="required" placeholder="请输入学生性别" autocomplete="off" class="layui-input">
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">生日</label>
<div class="layui-input-inline">
<input type="text" name="birthday" id="birthday" required lay-verify="required" placeholder="请输入学生生日" autocomplete="off" class="layui-input">
</div>
</div>
<div class="layui-form-item">
<div class="layui-input-block">
<button class="layui-btn" value="立即提交" id="add">立即提交</button>
<button class="layui-btn layui-btn-primary" value="重置" id="reset">重置</button>
</div>
</div>
</div>
</div>
<fieldset class="layui-elem-field layui-field-title" style="margin-top: 30px;">
<legend>学生信息表</legend>
</fieldset>
<table class="layui-hide" id="test" lay-filter="test">
</table>
<script type="text/html" id="toolbarDemo">
<div class="demoTable">
         
<input class="layui-btn layui-btn-sm" type="button" id="add_btn" value="添加"></input>
<input class="layui-btn layui-btn-sm" type="button" id="deleteAll_btn" value="删除"></input>
 
搜索ID：
<div class="layui-inline">
<input class="layui-input" name="id" id="demoReload" autocomplete="off">
</div>
<button class="layui-btn" type="button" id="search_btn" data-type="reload">搜索</button>
</div>
</script>
<script type="text/html" id="barDemo">
<!-- <a class="layui-btn layui-btn-xs" lay-event="add">添加</a>-->
<a class="layui-btn layui-btn-xs" lay-event="edit">编辑</a>
<a class="layui-btn layui-btn-danger layui-btn-xs" lay-event="del">删除</a>
</script>
<script>
layui.use('table', function(){
var table = layui.table;
var $ = layui.jquery;
table.render({
elem: '#test'
,url:'student/findAll'
,toolbar: '#toolbarDemo' //开启头部工具栏，并为其绑定左侧模板
,defaultToolbar: ['filter', 'exports', 'print', { //自定义头部工具栏右侧图标。如无需自定义，去除该参数即可
title: '提示'
,layEvent: 'LAYTABLE_TIPS'
,icon: 'layui-icon-tips'
}]
,title: '用户数据表'
,id: 'test'
,cols: [[
{type: 'checkbox', fixed: 'left'}
,{field:'id', title:'ID', width:320, unresize: true, sort: true}
,{field:'num', title:'学号', width:320, unresize: true, sort: true}
,{field:'name', title:'姓名', width:320, edit: 'text'}
,{field:'sex', title:'性别', width:320, edit: 'text'}
,{field:'birthday', title:'出生日期', width:320,edit: 'text'}
,{fixed: 'right', title:'操作', toolbar: '#barDemo', width:200}
]]
,page: false
});
$('#reset').on('click', function () {
var num = $("#num").val("");
var name = $("#name").val("");
var sex = $("#sex").val("");
var birthday = $("#birthday").val("");
});
$('#add').on('click', function () {
var num = $("#num").val();
var name = $("#name").val();
var sex = $("#sex").val();
var birthday = $("#birthday").val();
console.log(num);
console.log(name);
console.log(sex);
console.log(birthday);
if (num==undefined||num==''){
console.log('学号不能为空!');
layer.msg('学号不能为空!',function() {time:2000});
return false;
}
if (name==undefined||name==''){
console.log('姓名不能为空!');
layer.msg('姓名不能为空!',function() {time:2000});
return false;
}
if (sex==undefined||sex==''){
console.log('性别不能为空!');
layer.msg('性别不能为空!',function() {time:2000});
return false;
}
if (birthday==undefined||birthday==''){
console.log('生日不能为空!');
layer.msg('生日不能为空!',function() {time:2000});
return false;
}
$.ajax({
url: "student/add",
type: "POST",
data: {"num":num,"name":name,sex:sex,birthday:birthday},
success: function (data) {
console.log(data);
if(data=="ok") {//ok说明登录成功
layer.close(layer.index);
layer.msg('添加成功!',function() {time:2000});
$("#num").val("");
$("#name").val("");
$("#sex").val("");
$("#birthday").val("");
table.reload('test',{
url:'student/findAll'
,
page: {
curr:1
}
});
}
},//响应成功后的回调函数
error: function () {
layer.msg('添加失败!',function() {time:2000});
},//表示如果请求响应出现错误，会执行的回调函数
//dataType: "json"//设置接受到的响应数据的格式
});
});
$(document).on('click','#search_btn',function (data) {
var search = $('#demoReload');
table.reload('test',{
where:{
num : search.val()
},
url:'student/findByNum',
page: {
curr:1
}
});
});
//添加
$(document).on('click','#add_btn',function (data) {
layer.open({
type: 1,
skin: 'layui-layer-rim', //加上边框
area: ['600px', '450px'], //宽高
content: $('#layertest')
});
table.reload('test',{
url:'student/findAll'
,
page: {
curr:1
}
});
});
//批量删除
$(document).on('click','#deleteAll_btn',function (data) {
var checkStatus = table.checkStatus('test'),
data = checkStatus.data,
nums = "";
if (data.length > 0) {
for (var i in data) {
nums += data[i].num + ",";
}
console.log(nums);
layer.confirm('确定删除选中的用户？', {icon: 3, title: '提示信息'}, function (index) {
$.ajax({
url: "student/deleteByNum",
type: "POST",
data: {num: nums},
success: function (msg) {
console.log(msg)
if (msg == "ok") {
layer.msg('删除成功!',function() {time:2000})
table.reload('test',{
url:'student/findAll',
page: {
curr:1
}
});
} else {
layer.msg("删除失败", function() {time:2000});
}
}
});
});
} else {
layer.msg("请选择需要删除的用户");
}
});
//头工具栏事件
table.on('toolbar(test)', function(obj){
var checkStatus = table.checkStatus(obj.config.id);
switch(obj.event){
case 'getCheckData':
var data = checkStatus.data;
layer.alert(JSON.stringify(data));
break;
case 'getCheckLength':
var data = checkStatus.data;
layer.msg('选中了：'+ data.length + ' 个');
break;
case 'isAll':
layer.msg(checkStatus.isAll ? '全选': '未全选');
break;
//自定义头工具栏右侧图标 - 提示
case 'LAYTABLE_TIPS':
layer.alert('这是工具栏右侧自定义的一个图标按钮');
break;
};
});
//监听行工具事件 del
table.on('tool(test)', function(obj){
var data = obj.data;
console.log(obj.data.num);
console.log(obj.data.name);
console.log(obj.data.sex);
console.log(obj.data.birthday);
//console.log(obj)
if(obj.event === 'del'){
layer.confirm('删除以下信息<br>'+ '<br>学号: '+ data.num+ '<br>姓名: '+ data.name +'<br>性别: ' +data.sex +'<br>出生日期: ' +data.birthday, function(index){
$.ajax({
url: "student/deleteByNum",
type: "POST",
data: {num: data.num},
success: function (msg) {
if (msg == "ok") {
//删除这一行
obj.del();
//关闭弹框
layer.close(index);
layer.msg('删除成功!',function() {time:2000})
} else {
layer.msg("删除失败", function() {time:2000});
}
}
});
return false;
});
} else if(obj.event === 'edit'){
layer.confirm('更改为以下信息<br>'+ '<br>姓名: '+ data.name +'<br>性别: ' +data.sex +'<br>出生日期: ' +data.birthday, function(index){
$.ajax({
url: "student/updateByNum",
type: "POST",
data: {num: data.num,name: data.name,sex: data.sex,birthday: data.birthday},
success: function (msg) {
if (msg == "ok") {
//删除这一行
//关闭弹框
layer.close(index);
layer.msg('修改成功!',function() {time:2000})
} else {
layer.msg("修改失败", function() {time:2000});
}
}
});
return false;
});
}
else if(obj.event === 'add'){
layer.open({
type: 1,
skin: 'layui-layer-rim', //加上边框
area: ['600px', '450px'], //宽高
content: $('#layertest')
});
table.reload('test',{
url:'student/findAll'
,
page: {
curr:1
}
});
}
});
});
</script>
</body>
</html>
二、编写controller层，书写对应的方法。
controller层的作用就是接受或返回前端值，和前端进行交互，并且调用service业务层的对象来进行处理。
StudentController.java
package com.wjb.controller;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.wjb.domain.Student;
import com.wjb.service.StudentService;
import org.apache.ibatis.annotations.Param;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@Controller
@RequestMapping("/student") //Mapping 中的value值对应前端界面的url
@ResponseBody //不进行跳转
public class StudentController {
@Autowired
private StudentService studentService;
//添加学生信息
@RequestMapping(value = "/add",produces = "html/text;charset=UTF-8",method = {RequestMethod. POST , RequestMethod. GET })
@ResponseBody
public String add(Student student){
studentService.add(student);
System.out.println(student);
System.out.println("添加成功！");
return "ok";
}
//修改学生信息
@RequestMapping(value = "/updateByNum",produces = "html/text;charset=UTF-8",method = {RequestMethod. POST , RequestMethod. GET })
@ResponseBody
public String updateByNum(Student student){
studentService.updateByNum(student);
System.out.println(student);
System.out.println("修改成功！");
return "ok";
}
@RequestMapping(value = "/deleteByNum",produces = "html/text;charset=UTF-8",method = {RequestMethod. POST , RequestMethod. GET })
@ResponseBody
public String deleteByNum(HttpServletRequest request){
String num = request.getParameter("num");
System.out.println(num);
String[] nums=num.split(","); //分割id，成一个字符串数组
studentService.deleteByNums(nums);
System.out.println("删除成功!");
return "ok";
}
//查询学生信息
@GetMapping(value = "/findByNum",produces = "text/html; charset=utf-8")
@ResponseBody
public String findByNum(HttpServletRequest request) throws JsonProcessingException {
String num = request.getParameter("num");
System.out.println(num);
List<Student> studentList = studentService.findByNum(num);
int count1 = studentList.size();
String count = ""+ count1;
System.out.println(count);
Map<String, Object> result = new HashMap<String, Object>();
//System.out.println(paperslist);
result.put("code", 0);
result.put("msg", "");
result.put("count",count);
result.put("data",studentList);
System.out.println(result);
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString (result);
return json;
}
//遍历
@GetMapping(value = "/findAll",produces = "text/html; charset=utf-8")
@ResponseBody
public String findAll() throws JsonProcessingException {
List<Student> studentList = studentService.findAll();
int count1 = studentList.size();
String count = ""+ count1;
Map<String, Object> result = new HashMap<String, Object>();
result.put("code", 0);
result.put("msg", "");
result.put("count",count);
result.put("data",studentList);
System.out.println(result);
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString (result);
return json;
}
}
三、编写业务层接口以及接口的实现。
service层是接受controller层的数据，最后交给mapper层处理，执行sql。
在service包下建立StudentService.java,这是一个接口interface
package com.wjb.service;
import com.wjb.domain.Student;
import java.util.List;
public interface StudentService {
public void add(Student student);
public void updateByNum(Student student);
public List<Student> findAll();
public List<Student> findByNum(String num);
public void deleteByNums(String[] nums);
}
在service包下建立impl包，在impl下编写对应接口的实现。
StudentServiceImpl.java
package com.wjb.service.impl;
import com.wjb.domain.Student;
import com.wjb.mapper.StudentMapper;
import com.wjb.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service("studentService")
public class StudentServiceImpl implements StudentService {
@Autowired
private StudentMapper studentMapper;
@Override
public void add(Student student) {
studentMapper.add(student);
}
@Override
public void updateByNum(Student student) {
studentMapper.updateByNum(student);
}
@Override
public List<Student> findAll() {
return studentMapper.findAll();
}
@Override
public List<Student> findByNum(String num) {
return studentMapper.findByNum(num);
}
@Override
public void deleteByNums(String[] nums) {
studentMapper.deleteByNums(nums);
}
}
四、编写Mapper层。
这里也是一个接口，这里的mapper会调用xml中的mapper中的SQL。
Student.mapper.java
package com.wjb.mapper;
import com.wjb.domain.Student;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface StudentMapper {
public void add(Student student);
public void updateByNum(Student student);
public List<Student> findAll();
public List<Student> findByNum(String num);
public void deleteByNums(@Param("nums") String[] nums);
}
五、在resources下建立StudentMapper.xml.
创建的路径一定是com\wjb\mapper 这里不能用.
这个xml中对应着增删改查的SQL，其中id对应着mapper层的方法名。
StudentMapper.xml
<?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.wjb.mapper.StudentMapper">
<insert id="add" parameterType="student" useGeneratedKeys="true" keyProperty="id" keyColumn="id"> # 返回自增主键id
insert into student values(#{id},#{num},#{name},#{sex},#{birthday})
</insert>
<update id="updateByNum" parameterType="student">
update student
set name = #{name},
sex = #{sex},
birthday = #{birthday}
where num = #{num}
</update>
<select id="findAll" resultType="student">
select * from student
</select>
<select id="findByNum" resultType="student">
select * from student where num=#{num}
</select>
<delete id="deleteByNums">
delete
from student
where num in
<foreach collection="nums" item="num" separator="," open="(" close=")">
#{num}
</foreach>
;
</delete>
</mapper>
第五步，运行展示
目前功能只有简单的增删改查，不过用到了ajax的异步局部刷新，并且有批量删除功能。因为这是第一次整合ssm框架，肯定存在着很多不足，需要大佬指点指点，如果需要相关文件的可以私聊我，记得点个赞哦！
