• SpringMVC之CRUD(增删改查)

数据库

# 创建表CREATE TABLE Student (sid INT PRIMARY KEY,sname VARCHAR(50),sage INT,spic VARCHAR(255));给student表插入数据
INSERT INTO Student (sid, sname, sage, spic)
VALUES 
(1, 'John Do', 25, 'path/to/image1.jpg'),
(2, 'Jane Smith', 30, 'path/to/image2.jpg'),
(3, 'Alex Johnson', 35, 'path/to/image3.jpg'),
(4, 'Emily Davis', 28, 'path/to/image4.jpg'),
(5, 'Michael Wilson', 40, 'path/to/image5.jpg'),
(6, 'Sarah Brown', 37, 'path/to/image6.jpg'),
(7, 'David Lee', 45, 'path/to/image7.jpg'),
(8, 'Carolyn Taylor', 22, 'path/to/image8.jpg');

公共页面跳转,配置。。。

package com.zlj.web;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;/*** @author zlj* @create 2023-09-07 14:50* 处理页面跳转* 以往*<a href="clz/preSave">新增</a>*<a href="book/preSave">新增</a>*<a href="order/preSave">新增</a>* 现在*<a href="page/clz/preSave">新增</a>*<a href="page/book/preSave">新增</a>*<a href="page/order/preSave">新增</a>*/
@Controller
public class pageController {
@RequestMapping("/page/{page}")public String toPage(@PathVariable("page") String page){return page;
}
@RequestMapping("/page/{dir}{page}")public String toDirPage(@PathVariable("dir") String dir,@PathVariable("page") String page){return dir + "/" + page;}
//    @RequestMapping("/order/presave")
//    public String orderpre(){
//        return "/order/presave";
//    }
//    @RequestMapping("/clz/presave")
//    public String clzpre(){
//        return "/clz/presave";
//    }}

package com.zlj.util;import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;public class PageBean implements Serializable {private static final long serialVersionUID = 2422581023658455731L;//页码private int page=1;//每页显示记录数private int rows=10;//总记录数private int total=0;//是否分页private boolean isPagination=true;//上一次的请求路径private String url;//获取所有的请求参数private Map<String,String[]> map;public PageBean() {super();}//设置请求参数public void setRequest(HttpServletRequest req) {String page=req.getParameter("page");String rows=req.getParameter("rows");String pagination=req.getParameter("pagination");this.setPage(page);this.setRows(rows);this.setPagination(pagination);this.url=req.getContextPath()+req.getServletPath();this.map=req.getParameterMap();}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public Map<String, String[]> getMap() {return map;}public void setMap(Map<String, String[]> map) {this.map = map;}public int getPage() {return page;}public void setPage(int page) {this.page = page;}public void setPage(String page) {if(null!=page&&!"".equals(page.trim()))this.page = Integer.parseInt(page);}public int getRows() {return rows;}public void setRows(int rows) {this.rows = rows;}public void setRows(String rows) {if(null!=rows&&!"".equals(rows.trim()))this.rows = Integer.parseInt(rows);}public int getTotal() {return total;}public void setTotal(int total) {this.total = total;}public void setTotal(String total) {this.total = Integer.parseInt(total);}public boolean isPagination() {return isPagination;}public void setPagination(boolean isPagination) {this.isPagination = isPagination;}public void setPagination(String isPagination) {if(null!=isPagination&&!"".equals(isPagination.trim()))this.isPagination = Boolean.parseBoolean(isPagination);}/*** 获取分页起始标记位置* @return*/public int getStartIndex() {//(当前页码-1)*显示记录数return (this.getPage()-1)*this.rows;}/*** 末页* @return*/public int getMaxPage() {int totalpage=this.total/this.rows;if(this.total%this.rows!=0)totalpage++;return totalpage;}/*** 下一页* @return*/public int getNextPage() {int nextPage=this.page+1;if(this.page>=this.getMaxPage())nextPage=this.getMaxPage();return nextPage;}/*** 上一页* @return*/public int getPreivousPage() {int previousPage=this.page-1;if(previousPage<1)previousPage=1;return previousPage;}@Overridepublic String toString() {return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", isPagination=" + isPagination+ "]";}
}

package com.zlj.util;import com.fasterxml.jackson.databind.ObjectMapper;import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;public class ResponseUtil {public static void write(HttpServletResponse response,Object o)throws Exception{response.setContentType("text/html;charset=utf-8");PrintWriter out=response.getWriter();out.println(o.toString());out.flush();out.close();}public static void writeJson(HttpServletResponse response,Object o)throws Exception{ObjectMapper om = new ObjectMapper();
//		om.writeValueAsString(o)代表了json串write(response, om.writeValueAsString(o));}
}

//generatorConfig.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN""http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
<generatorConfiguration><!-- 引入配置文件 --><properties resource="jdbc.properties"/><!--指定数据库jdbc驱动jar包的位置--><classPathEntry location="D:\\software\\apache-maven-3.5.0-bin\\apache-maven-3.5.0-bin\\apache-maven-3.5.0\\conf\\mvn_repository\\mysql\\mysql-connector-java\\5.1.44\\mysql-connector-java-5.1.44.jar"/><!-- 一个数据库一个context --><context id="infoGuardian"><!-- 注释 --><commentGenerator><property name="suppressAllComments" value="true"/><!-- 是否取消注释 --><property name="suppressDate" value="true"/> <!-- 是否生成注释代时间戳 --></commentGenerator><!-- jdbc连接 --><jdbcConnection driverClass="${jdbc.driver}"connectionURL="${jdbc.url}" userId="${jdbc.username}" password="${jdbc.password}"/><!-- 类型转换 --><javaTypeResolver><!-- 是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.） --><property name="forceBigDecimals" value="false"/></javaTypeResolver><!-- 01 指定javaBean生成的位置 --><!-- targetPackage：指定生成的model生成所在的包名 --><!-- targetProject：指定在该项目下所在的路径  --><javaModelGenerator targetPackage="com.zlj.model"targetProject="src/main/java"><!-- 是否允许子包，即targetPackage.schemaName.tableName --><property name="enableSubPackages" value="false"/><!-- 是否对model添加构造函数 --><property name="constructorBased" value="true"/><!-- 是否针对string类型的字段在set的时候进行trim调用 --><property name="trimStrings" value="false"/><!-- 建立的Model对象是否 不可改变  即生成的Model对象不会有 setter方法，只有构造方法 --><property name="immutable" value="false"/></javaModelGenerator><!-- 02 指定sql映射文件生成的位置 --><sqlMapGenerator targetPackage="com.zlj.mapper"targetProject="src/main/java"><!-- 是否允许子包，即targetPackage.schemaName.tableName --><property name="enableSubPackages" value="false"/></sqlMapGenerator><!-- 03 生成XxxMapper接口 --><!-- type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象 --><!-- type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象 --><!-- type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口 --><javaClientGenerator targetPackage="com.zlj.mapper"targetProject="src/main/java" type="XMLMAPPER"><!-- 是否在当前路径下新加一层schema,false路径com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] --><property name="enableSubPackages" value="false"/></javaClientGenerator><!-- 配置表信息 --><!-- schema即为数据库名 --><!-- tableName为对应的数据库表 --><!-- domainObjectName是要生成的实体类 --><!-- enable*ByExample是否生成 example类 --><!--<table schema="" tableName="t_book" domainObjectName="Book"--><!--enableCountByExample="false" enableDeleteByExample="false"--><!--enableSelectByExample="false" enableUpdateByExample="false">--><!--&lt;!&ndash; 忽略列，不生成bean 字段 &ndash;&gt;--><!--&lt;!&ndash; <ignoreColumn column="FRED" /> &ndash;&gt;--><!--&lt;!&ndash; 指定列的java数据类型 &ndash;&gt;--><!--&lt;!&ndash; <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> &ndash;&gt;--><!--</table>--><table schema="" tableName="student" domainObjectName="Stu"enableCountByExample="false" enableDeleteByExample="false"enableSelectByExample="false" enableUpdateByExample="false"></table></context>
</generatorConfiguration>

//jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://47.100.191.44:3308/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
jdbc.username=test01
jdbc.password=test01

//log4j2.xml
<?xml version="1.0" encoding="UTF-8"?><!-- status : 指定log4j本身的打印日志的级别.ALL< Trace < DEBUG < INFO < WARN < ERROR< FATAL < OFF。 monitorInterval : 用于指定log4j自动重新配置的监测间隔时间，单位是s,最小是5s. -->
<Configuration status="WARN" monitorInterval="30"><Properties><!-- 配置日志文件输出目录 ${sys:user.home} --><Property name="LOG_HOME">/root/workspace/lucenedemo/logs</Property><property name="ERROR_LOG_FILE_NAME">/root/workspace/lucenedemo/logs/error</property><property name="WARN_LOG_FILE_NAME">/root/workspace/lucenedemo/logs/warn</property><property name="PATTERN">%d{yyyy-MM-dd HH:mm:ss.SSS} [%t-%L] %-5level %logger{36} - %msg%n</property></Properties><Appenders><!--这个输出控制台的配置 --><Console name="Console" target="SYSTEM_OUT"><!-- 控制台只输出level及以上级别的信息(onMatch),其他的直接拒绝(onMismatch) --><ThresholdFilter level="trace" onMatch="ACCEPT"onMismatch="DENY" /><!-- 输出日志的格式 --><!-- %d{yyyy-MM-dd HH:mm:ss, SSS} : 日志生产时间 %p : 日志输出格式 %c : logger的名称%m : 日志内容，即 logger.info("message") %n : 换行符 %C : Java类名 %L : 日志输出所在行数 %M: 日志输出所在方法名 hostName : 本地机器名 hostAddress : 本地ip地址 --><PatternLayout pattern="${PATTERN}" /></Console><!--文件会打印出所有信息，这个log每次运行程序会自动清空，由append属性决定，这个也挺有用的，适合临时测试用 --><!--append为TRUE表示消息增加到指定文件中，false表示消息覆盖指定的文件内容，默认值是true --><File name="log" fileName="logs/test.log" append="false"><PatternLayoutpattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /></File><!-- 这个会打印出所有的info及以下级别的信息，每次大小超过size， 则这size大小的日志会自动存入按年份-月份建立的文件夹下面并进行压缩，作为存档 --><RollingFile name="RollingFileInfo" fileName="${LOG_HOME}/info.log"filePattern="${LOG_HOME}/$${date:yyyy-MM}/info-%d{yyyy-MM-dd}-%i.log"><!--控制台只输出level及以上级别的信息（onMatch），其他的直接拒绝（onMismatch） --><ThresholdFilter level="info" onMatch="ACCEPT"onMismatch="DENY" /><PatternLayoutpattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /><Policies><!-- 基于时间的滚动策略，interval属性用来指定多久滚动一次，默认是1 hour。 modulate=true用来调整时间：比如现在是早上3am，interval是4，那么第一次滚动是在4am，接着是8am，12am...而不是7am. --><!-- 关键点在于 filePattern后的日期格式，以及TimeBasedTriggeringPolicy的interval， 日期格式精确到哪一位，interval也精确到哪一个单位 --><!-- log4j2的按天分日志文件 : info-%d{yyyy-MM-dd}-%i.log --><TimeBasedTriggeringPolicy interval="1"modulate="true" /><!-- SizeBasedTriggeringPolicy:Policies子节点， 基于指定文件大小的滚动策略，size属性用来定义每个日志文件的大小. --><!-- <SizeBasedTriggeringPolicy size="2 kB" /> --></Policies></RollingFile><RollingFile name="RollingFileWarn" fileName="${WARN_LOG_FILE_NAME}/warn.log"filePattern="${WARN_LOG_FILE_NAME}/$${date:yyyy-MM}/warn-%d{yyyy-MM-dd}-%i.log"><ThresholdFilter level="warn" onMatch="ACCEPT"onMismatch="DENY" /><PatternLayoutpattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /><Policies><TimeBasedTriggeringPolicy /><SizeBasedTriggeringPolicy size="2 kB" /></Policies><!-- DefaultRolloverStrategy属性如不设置，则默认为最多同一文件夹下7个文件，这里设置了20 --><DefaultRolloverStrategy max="20" /></RollingFile><RollingFile name="RollingFileError" fileName="${ERROR_LOG_FILE_NAME}/error.log"filePattern="${ERROR_LOG_FILE_NAME}/$${date:yyyy-MM}/error-%d{yyyy-MM-dd-HH-mm}-%i.log"><ThresholdFilter level="error" onMatch="ACCEPT"onMismatch="DENY" /><PatternLayoutpattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /><Policies><!-- log4j2的按分钟 分日志文件 : warn-%d{yyyy-MM-dd-HH-mm}-%i.log --><TimeBasedTriggeringPolicy interval="1"modulate="true" /><!-- <SizeBasedTriggeringPolicy size="10 MB" /> --></Policies></RollingFile></Appenders><!--然后定义logger，只有定义了logger并引入的appender，appender才会生效 --><Loggers><!--过滤掉spring和mybatis的一些无用的DEBUG信息 --><logger name="org.springframework" level="INFO"></logger><logger name="org.mybatis" level="INFO"></logger><!-- 第三方日志系统 --><logger name="org.springframework" level="ERROR" /><logger name="org.hibernate" level="ERROR" /><logger name="org.apache.struts2" level="ERROR" /><logger name="com.opensymphony.xwork2" level="ERROR" /><logger name="org.jboss" level="ERROR" /><!-- 配置日志的根节点 --><root level="all"><appender-ref ref="Console" /><appender-ref ref="RollingFileInfo" /><appender-ref ref="RollingFileWarn" /><appender-ref ref="RollingFileError" /></root></Loggers></Configuration>

//spring-content.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"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><!--    String框架与mybatis整合的配置文件加载到Spring的上下文中--><import resource="classpath:spring-mybatis.xml"></import>
</beans>

//spring-mvc.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:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"><!--1) 扫描com.zking.zf及子子孙孙包下的控制器(扫描范围过大，耗时)--><context:component-scan base-package="com.zlj"/><!--2) 此标签默认注册DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter --><mvc:annotation-driven /><!--3) 创建ViewResolver视图解析器 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- viewClass需要在pom中引入两个包：standard.jar and jstl.jar --><property name="viewClass"value="org.springframework.web.servlet.view.JstlView"></property><property name="prefix" value="/WEB-INF/jsp/"/><property name="suffix" value=".jsp"/></bean><!--4) 单独处理图片、样式、js等资源 -->
<!--     <mvc:resources location="/css/" mapping="/css/**"/>-->
<!--     <mvc:resources location="/js/" mapping="/js/**"/>-->
<!--     <mvc:resources location="WEB-INF/images/" mapping="/images/**"/>  --><mvc:resources location="/static/" mapping="/static/**"/>
<!--    处理controller层发送请求到biz，会经过切面拦截处理--><aop:aspectj-autoproxy/>
</beans>

//spring-mybatis.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:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"xmlns:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.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/aop http://www.springframework.org/schema/aop/spring-aop.xsd"><!--1. 注解式开发 --><!-- 注解驱动 --><context:annotation-config/><!-- 用注解方式注入bean，并指定查找范围：com.javaxl.ssm及子子孙孙包--><context:component-scan base-package="com.zlj"/><context:property-placeholder location="classpath:jdbc.properties"/><bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"destroy-method="close"><property name="driverClassName" value="${jdbc.driver}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/><!--初始连接数--><property name="initialSize" value="10"/><!--最大活动连接数--><property name="maxTotal" value="100"/><!--最大空闲连接数--><property name="maxIdle" value="50"/><!--最小空闲连接数--><property name="minIdle" value="10"/><!--设置为-1时，如果没有可用连接，连接池会一直无限期等待，直到获取到连接为止。--><!--如果设置为N（毫秒），则连接池会等待N毫秒，等待不到，则抛出异常--><property name="maxWaitMillis" value="-1"/></bean><!--4. spring和MyBatis整合 --><!--1) 创建sqlSessionFactory--><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><!-- 指定数据源 --><property name="dataSource" ref="dataSource"/><!-- 自动扫描XxxMapping.xml文件，**任意路径 --><property name="mapperLocations" value="classpath*:com/zlj/**/mapper/*.xml"/><!-- 指定别名 --><property name="typeAliasesPackage" value="com/zlj/**/model"/><!--配置pagehelper插件--><property name="plugins"><array><bean class="com.github.pagehelper.PageInterceptor"><property name="properties"><value>helperDialect=mysql</value></property></bean></array></property></bean><!--2) 自动扫描com/javaxl/ssm/**/mapper下的所有XxxMapper接口(其实就是DAO接口)，并实现这些接口，--><!--   即可直接在程序中使用dao接口，不用再获取sqlsession对象--><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><!--basePackage 属性是映射器接口文件的包路径。--><!--你可以使用分号或逗号 作为分隔符设置多于一个的包路径--><property name="basePackage" value="com/zlj/**/mapper"/><property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/></bean><bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource" /></bean><tx:annotation-driven transaction-manager="transactionManager" /><aop:aspectj-autoproxy/></beans>

//header.jsp
<%@ page contentType="text/html; charset=UTF-8" language="java" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<%@ taglib uri="http://jsp.veryedu.cn" prefix="z"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><linkhref="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css"rel="stylesheet"><scriptsrc="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.js"></script><title>学生信息</title><base href="${pageContext.request.contextPath }"/><style type="text/css">.page-item input {padding: 0;width: 40px;height: 100%;text-align: center;margin: 0 6px;}.page-item input, .page-item b {line-height: 38px;float: left;font-weight: 400;}.page-item.go-input {margin: 0 10px;}</style>
</head>
<body>
<%request.setAttribute("ctx",request.getContextPath());
%>
</body>
</html>

//web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"version="3.1"><display-name>Archetype Created Web Application</display-name><!-- Spring和web项目集成start --><!-- spring上下文配置文件 --><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-content.xml</param-value></context-param><!-- 读取Spring上下文的监听器 --><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- Spring和web项目集成end --><!-- 中文乱码处理 --><filter><filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><async-supported>true</async-supported><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><!-- Spring MVC servlet --><servlet><servlet-name>SpringMVC</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!--此参数可以不配置，默认值为：/WEB-INF/springmvc-servlet.xml--><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup><!--web.xml 3.0的新特性，是否支持异步--><async-supported>true</async-supported></servlet><servlet-mapping><servlet-name>SpringMVC</servlet-name><url-pattern>/</url-pattern></servlet-mapping>
</web-app>

//zlj.tld
<?xml version="1.0" encoding="UTF-8" ?><taglib xmlns="http://java.sun.com/xml/ns/j2ee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"version="2.0"><description>zlj 1.1 core library</description><display-name>zlj core</display-name><tlib-version>1.1</tlib-version><short-name>zlj</short-name><uri>http://jsp.veryedu.cn</uri><tag><name>page</name><tag-class>com.zlj.tag.PageTag</tag-class><body-content>JSP</body-content><attribute><name>pageBean</name><required>true</required><rtexprvalue>true</rtexprvalue></attribute></tag></taglib>

后台接口准备

ssm的增删改查

1.先逆向生成对应的类（model，mapper.xml，mapper.java）

2.biz层

3.web层（依托于自定义mvc的分页标签==>pom.xml）

4.前端

package com.zlj.model;import lombok.ToString;@ToString
public class Stu {private Integer sid;private String sname;private Integer sage;private String spic="暂无图片";public Stu(Integer sid, String sname, Integer sage, String spic) {this.sid = sid;this.sname = sname;this.sage = sage;this.spic = spic;}public Stu() {super();}public Integer getSid() {return sid;}public void setSid(Integer sid) {this.sid = sid;}public String getSname() {return sname;}public void setSname(String sname) {this.sname = sname;}public Integer getSage() {return sage;}public void setSage(Integer sage) {this.sage = sage;}public String getSpic() {return spic;}public void setSpic(String spic) {this.spic = spic;}
}

<?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.zlj.mapper.StuMapper" ><resultMap id="BaseResultMap" type="com.zlj.model.Stu" ><constructor ><idArg column="sid" jdbcType="INTEGER" javaType="java.lang.Integer" /><arg column="sname" jdbcType="VARCHAR" javaType="java.lang.String" /><arg column="sage" jdbcType="INTEGER" javaType="java.lang.Integer" /><arg column="spic" jdbcType="VARCHAR" javaType="java.lang.String" /></constructor></resultMap><sql id="Base_Column_List" >sid, sname, sage, spic</sql><select id="selectByCon" resultType="com.zlj.model.Stu" parameterType="com.zlj.model.Stu" >select<include refid="Base_Column_List" />from student<where><if test="sname != null">and sname like concat('%' , #{sname} , '%')</if></where></select><select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >select<include refid="Base_Column_List" />from studentwhere sid = #{sid,jdbcType=INTEGER}</select><delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >delete from studentwhere sid = #{sid,jdbcType=INTEGER}</delete><insert id="insert" parameterType="com.zlj.model.Stu" >insert into student (sid, sname, sage,spic)values (#{sid,jdbcType=INTEGER}, #{sname,jdbcType=VARCHAR}, #{sage,jdbcType=INTEGER},#{spic,jdbcType=VARCHAR})</insert><insert id="insertSelective" parameterType="com.zlj.model.Stu" >insert into student<trim prefix="(" suffix=")" suffixOverrides="," ><if test="sid != null" >sid,</if><if test="sname != null" >sname,</if><if test="sage != null" >sage,</if><if test="spic != null" >spic,</if></trim><trim prefix="values (" suffix=")" suffixOverrides="," ><if test="sid != null" >#{sid,jdbcType=INTEGER},</if><if test="sname != null" >#{sname,jdbcType=VARCHAR},</if><if test="sage != null" >#{sage,jdbcType=INTEGER},</if><if test="spic != null" >#{spic,jdbcType=VARCHAR},</if></trim></insert><update id="updateByPrimaryKeySelective" parameterType="com.zlj.model.Stu" >update student<set ><if test="sname != null" >sname = #{sname,jdbcType=VARCHAR},</if><if test="sage != null" >sage = #{sage,jdbcType=INTEGER},</if><if test="spic != null" >spic = #{spic,jdbcType=VARCHAR},</if></set>where sid = #{sid,jdbcType=INTEGER}</update><update id="updateByPrimaryKey" parameterType="com.zlj.model.Stu" >update studentset sname = #{sname,jdbcType=VARCHAR},sage = #{sage,jdbcType=INTEGER},spic = #{spic,jdbcType=VARCHAR}where sid = #{sid,jdbcType=INTEGER}</update>
</mapper>

package com.zlj.mapper;import com.zlj.model.Stu;
import org.springframework.stereotype.Repository;import java.util.List;@Repository
public interface StuMapper {int deleteByPrimaryKey(Integer sid);int insert(Stu record);int insertSelective(Stu record);Stu selectByPrimaryKey(Integer sid);int updateByPrimaryKeySelective(Stu record);int updateByPrimaryKey(Stu record);List<Stu> selectByCon(Stu stu);
}

package com.zlj.biz;import com.zlj.model.Stu;
import com.zlj.util.PageBean;import java.util.List;/*** @author zlj* @create 2023-09-07 17:09*/
public interface StuBiz {int deleteByPrimaryKey(Integer sid);int insert(Stu record);int insertSelective(Stu record);Stu selectByPrimaryKey(Integer sid);int updateByPrimaryKeySelective(Stu record);int updateByPrimaryKey(Stu record);List<Stu> ListPager(Stu stu, PageBean PageBean);
}

package com.zlj.biz.Impl;import com.zlj.biz.StuBiz;
import com.zlj.mapper.StuMapper;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;/*** @author zlj* @create 2023-09-08 14:52*/
@Service
public class StuBizImpl implements StuBiz {
@Autowired
private StuMapper stuMapper;@Overridepublic int deleteByPrimaryKey(Integer sid) {return stuMapper.deleteByPrimaryKey(sid);}@Overridepublic int insert(Stu record) {return stuMapper.insert(record);}@Overridepublic int insertSelective(Stu record) {return stuMapper.insertSelective(record);}@Overridepublic Stu selectByPrimaryKey(Integer sid) {return stuMapper.selectByPrimaryKey(sid);}@Overridepublic int updateByPrimaryKeySelective(Stu record) {return stuMapper.updateByPrimaryKeySelective(record);}@Overridepublic int updateByPrimaryKey(Stu record) {return stuMapper.updateByPrimaryKey(record);}@Overridepublic List<Stu> ListPager(Stu stu, PageBean pageBean) {return stuMapper.selectByCon(stu);}}

package com.zlj.web;import com.zlj.biz.StuBiz;
import com.zlj.model.Stu;
import com.zlj.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;import javax.servlet.http.HttpServletRequest;
import java.util.List;/*** @author zlj* @create 2023-09-08 16:55*/
@Controller
@RequestMapping("/stu")
public class StuController {@Autowiredprivate StuBiz stuBiz;//    增@RequestMapping("/add")public String add(Stu stu,HttpServletRequest request) {int i = stuBiz.insert(stu);return "redirect:list";}//            删@RequestMapping("/del/{sid}")public String del(@PathVariable("sid") Integer sid) {stuBiz.deleteByPrimaryKey(sid);return "redirect:/stu/list";}//        改
@RequestMapping("/edit")
public String edit(Stu stu) {stuBiz.updateByPrimaryKeySelective(stu);return "redirect:list";
}
//                查@RequestMapping("/list")public String list(Stu stu, HttpServletRequest request) {//stu是用来接收前台传递后台的参数PageBean pageBean = new PageBean();pageBean.setRequest(request);List<Stu> stus = stuBiz.ListPager(stu, pageBean);request.setAttribute("lst", stus);request.setAttribute("pageBean", pageBean);
//      WEB-INF/jsp/stu/list.jspreturn "stu/list";}//数据回显@RequestMapping("/preSave")public String preSave(Stu stu, Model model) {if (stu != null && stu.getSid() != null && stu.getSid() != 0) {Stu s = stuBiz.selectByPrimaryKey(stu.getSid());model.addAttribute("s", s);}return "stu/edit";}
}

<%@ page language="java"pageEncoding="UTF-8"%>
<%@include file="/common/header.jsp"%>
<!DOCTYPE html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>博客的编辑界面</title>
</head>
<body>
<form action="${ctx }${empty s ? 'add' : 'edit'}" method="post">学生id:<input type="text" name="sid" value="${s.sid }"><br>学生姓名:<input type="text" name="sname" value="${s.sname }"><br>学生年龄:<input type="text" name="sage" value="${s.sage }"><br>学生图片:<input type="text" name="spic" value="${s.spic }"><br><input type="submit">
</form>
</body>
</html>

//list.jsp
<%@ page language="java" pageEncoding="UTF-8"%>
<%@include file="/common/header.jsp"%>
<!DOCTYPE html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>学生信息</title></head>
<body>
<form class="form-inline"action="${ctx}/stu/list" method="post"><div class="form-group mb-2"><input type="text" class="form-control-plaintext" name="sname"placeholder="请输入学生姓名"><!-- 			<input name="rows" value="20" type="hidden"> --><!-- 不想分页 --><%--        <input name="pagination" value="false" type="hidden">--%></div><button type="submit" class="btn btn-primary mb-2">查询</button><a class="btn btn-primary mb-2" href="${ctx}/stu/preSave">新增</a>
</form><table class="table table-striped"><thead><tr><th scope="col">学生id</th><th scope="col">学生姓名</th><th scope="col">学生年龄</th><th scope="col">学生图片</th><th scope="col">操作</th></tr></thead><tbody><c:forEach  var="s" items="${lst }"><tr><td>${s.sid }</td><td>${s.sname }</td><td>${s.sage }</td><td>${s.spic }</td><td><a href="${ctx}/stu/preSave?sid=${s.sid}">修改</a><a href="${ctx}/stu/del/${s.sid}">删除</a></td></tr></c:forEach></tbody>
</table>
<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
<z:page pageBean="${pageBean }"></z:page>
</body>
</html>

<%--Created by IntelliJ IDEA.User: 朱Date: 2023/9/8Time: 23:47To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
博客列表
</body>
</html>