实战SpringMVC之CRUD

目录

一、前期准备

1.1 编写页面跳转控制类

二、实现CRUD

2.1 相关依赖

2.2 配置文件

2.3 逆向生成

2.4 后台代码完善

2.4.1 编写切面类

2.4.2 编写工具类

2.4.3 编写biz层

2.4.4 配置mapper.xml

2.4.5 编写相应接口类（MusicMapper）

2.4.6 处理controller层发送到biz的请求(配置spring-mvc.xml)

2.4.7 编写tag助手标签类

2.4.8 引入tld标签库

2.4.9 编写controller类

2.5 前台代码

2.5.1 主页面编写

2.5.2 修改界面编写

三、展示效果

四、实战SpringMVC增删改查的收获

---

一、前期准备

1.1 编写页面跳转控制类

通过@PathVariable方式实现公共页面跳转。代码如下：

package com.Kissship.web;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;/*** @author Kissship* @site www.Kissship.com* @company xxx公司* @create 2023-09-07-15:01** 用来处理页面跳转*/
@Controller
public class PageController {//<a href="order/preSave">新增</a>   新增界面@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;}}

二、实现CRUD

2.1 相关依赖

pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>org.example</groupId><artifactId>kissshipssm</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>kissshipssm Maven Webapp</name><!-- FIXME change it to the project's website --><url>http://www.example.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target><maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version><!--添加jar包依赖--><!--1.spring 5.0.2.RELEASE相关--><spring.version>5.0.2.RELEASE</spring.version><!--2.mybatis相关--><mybatis.version>3.4.5</mybatis.version><!--mysql--><mysql.version>5.1.44</mysql.version><!--pagehelper分页jar依赖--><pagehelper.version>5.1.2</pagehelper.version><!--mybatis与spring集成jar依赖--><mybatis.spring.version>1.3.1</mybatis.spring.version><!--3.dbcp2连接池相关 druid--><commons.dbcp2.version>2.1.1</commons.dbcp2.version><commons.pool2.version>2.4.3</commons.pool2.version><!--4.log日志相关--><log4j2.version>2.9.1</log4j2.version><log4j2.disruptor.version>3.2.0</log4j2.disruptor.version><slf4j.version>1.7.13</slf4j.version><!--5.其他--><junit.version>4.12</junit.version><servlet.version>4.0.0</servlet.version><lombok.version>1.18.2</lombok.version><mybatis.ehcache.version>1.1.0</mybatis.ehcache.version><ehcache.version>2.10.0</ehcache.version><redis.version>2.9.0</redis.version><redis.spring.version>1.7.1.RELEASE</redis.spring.version><jackson.version>2.9.3</jackson.version><jstl.version>1.2</jstl.version><standard.version>1.1.2</standard.version><tomcat-jsp-api.version>8.0.47</tomcat-jsp-api.version><commons-fileupload.version>1.3.3</commons-fileupload.version><hibernate-validator.version>5.0.2.Final</hibernate-validator.version><shiro.version>1.3.2</shiro.version></properties><dependencies><!--1.spring相关--><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${spring.version}</version></dependency><!--2.mybatis相关--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>${mybatis.version}</version></dependency><!--mysql--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql.version}</version></dependency><!--pagehelper分页插件jar包依赖--><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper</artifactId><version>${pagehelper.version}</version></dependency><!--mybatis与spring集成jar包依赖--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>${mybatis.spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>${spring.version}</version></dependency><!--mybatis与ehcache整合--><dependency><groupId>org.mybatis.caches</groupId><artifactId>mybatis-ehcache</artifactId><version>${mybatis.ehcache.version}</version></dependency><!--ehcache依赖--><dependency><groupId>net.sf.ehcache</groupId><artifactId>ehcache</artifactId><version>${ehcache.version}</version></dependency><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>${redis.version}</version></dependency><dependency><groupId>org.springframework.data</groupId><artifactId>spring-data-redis</artifactId><version>${redis.spring.version}</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>${jackson.version}</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>${jackson.version}</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId><version>${jackson.version}</version></dependency><!--3.dbcp2连接池相关--><dependency><groupId>org.apache.commons</groupId><artifactId>commons-dbcp2</artifactId><version>${commons.dbcp2.version}</version><exclusions><exclusion><artifactId>commons-pool2</artifactId><groupId>org.apache.commons</groupId></exclusion></exclusions></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId><version>${commons.pool2.version}</version></dependency><!--springmvc依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${spring.version}</version></dependency><!--4.log日志相关依赖--><!-- log4j2日志相关依赖 --><!-- log配置：Log4j2 + Slf4j --><!-- slf4j核心包--><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>${slf4j.version}</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>jcl-over-slf4j</artifactId><version>${slf4j.version}</version><scope>runtime</scope></dependency><!--核心log4j2jar包--><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-api</artifactId><version>${log4j2.version}</version></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>${log4j2.version}</version></dependency><!--用于与slf4j保持桥接--><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-slf4j-impl</artifactId><version>${log4j2.version}</version></dependency><!--web工程需要包含log4j-web，非web工程不需要--><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-web</artifactId><version>${log4j2.version}</version><scope>runtime</scope></dependency><!--需要使用log4j2的AsyncLogger需要包含disruptor--><dependency><groupId>com.lmax</groupId><artifactId>disruptor</artifactId><version>${log4j2.disruptor.version}</version></dependency><!--5.其他--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${junit.version}</version><scope>test</scope></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>${servlet.version}</version><scope>provided</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>${lombok.version}</version><scope>provided</scope></dependency><dependency><groupId>jstl</groupId><artifactId>jstl</artifactId><version>${jstl.version}</version></dependency><dependency><groupId>taglibs</groupId><artifactId>standard</artifactId><version>${standard.version}</version></dependency><dependency><groupId>org.apache.tomcat</groupId><artifactId>tomcat-jsp-api</artifactId><version>${tomcat-jsp-api.version}</version></dependency><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>${commons-fileupload.version}</version></dependency><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-validator</artifactId><version>${hibernate-validator.version}</version></dependency><!--shiro依赖--><dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-core</artifactId><version>${shiro.version}</version></dependency><dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-web</artifactId><version>${shiro.version}</version></dependency><dependency><groupId>org.apache.shiro</groupId><artifactId>shiro-spring</artifactId><version>${shiro.version}</version></dependency><dependency><groupId>org.example</groupId><artifactId>Spring-mybatis</artifactId><version>1.0-SNAPSHOT</version><scope>compile</scope></dependency></dependencies><build><finalName>kissshipssm</finalName><resources><!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题--><resource><directory>src/main/java</directory><includes><include>**/*.xml</include></includes></resource><!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题--><resource><directory>src/main/resources</directory><includes><include>*.properties</include><include>*.xml</include></includes></resource></resources><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>${maven.compiler.plugin.version}</version><configuration><source>${maven.compiler.source}</source><target>${maven.compiler.target}</target><encoding>${project.build.sourceEncoding}</encoding></configuration></plugin><plugin><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-maven-plugin</artifactId><version>1.3.2</version><dependencies><!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql.version}</version></dependency></dependencies><configuration><overwrite>true</overwrite></configuration></plugin><plugin><artifactId>maven-clean-plugin</artifactId><version>3.1.0</version></plugin><!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --><plugin><artifactId>maven-resources-plugin</artifactId><version>3.0.2</version></plugin><plugin><artifactId>maven-compiler-plugin</artifactId><version>3.8.0</version></plugin><plugin><artifactId>maven-surefire-plugin</artifactId><version>2.22.1</version></plugin><plugin><artifactId>maven-war-plugin</artifactId><version>3.2.2</version></plugin><plugin><artifactId>maven-install-plugin</artifactId><version>2.5.2</version></plugin><plugin><artifactId>maven-deploy-plugin</artifactId><version>2.8.2</version></plugin></plugins></build></project>

2.2 配置文件

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-context.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>

2.3 逆向生成

生成后的对应目标目录如下：

在生成后的HBookMapper接口中，需要加上@Repository给Spring进行托管。

2.4 后台代码完善

2.4.1 编写切面类

PagerAspect：

package com.Kissship.aspect;import com.Kissship.utils.PageBean;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;import java.util.List;@Aspect
@Component
public class PagerAspect {@Around("execution(* *..*Biz.*Pager(..))")public Object invoke(ProceedingJoinPoint args) throws Throwable {PageBean pageBean=null;Object[] ags = args.getArgs();for (Object param:ags){
if (param instanceof PageBean){pageBean=(PageBean)param;break;
}}if (pageBean!=null&& pageBean.isPagination()){PageHelper.startPage(pageBean.getPage(),pageBean.getRows());}Object lst = args.proceed();if(pageBean!=null && pageBean.isPagination()){PageInfo pageInfo = new PageInfo((List) lst);pageBean.setTotal((int) pageInfo.getTotal());}return lst;}
}

2.4.2 编写工具类

PageBean：

package com.Kissship.utils;import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;/*** @author Kissship* @site www.Kissship.com* @company xxx公司* @create 2023-08-15-15:42*/
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+ "]";}
}

2.4.3 编写biz层

package com.Kissship.biz;import com.Kissship.model.Music;
import com.Kissship.utils.PageBean;import java.util.List;public interface MusicBiz {int deleteByPrimaryKey(Integer mid);int insert(Music record);int insertSelective(Music record);Music selectByPrimaryKey(Integer mid);int updateByPrimaryKeySelective(Music record);int updateByPrimaryKey(Music record);List<Music> listPager(Music music, PageBean pageBean);
}

注：

这个方法为查询返回列表方法，包含分页，因为切面类对其进行切面，所以在命名时，必须以Pager结尾。

2.4.4 配置mapper.xml

<select id="selectBycon" resultType="com.Kissship.model.Music" parameterType="com.Kissship.model.Music" >select<include refid="Base_Column_List" />from jay_music<where><if test="mname != null">and mname like concat('%',#{mname},'%')</if></where></select>

2.4.5 编写相应接口类（MusicMapper）

在自动生成的代码下添加以下：

List<Music> selectBycon(Music music);

2.4.6 处理controller层发送到biz的请求(配置spring-mvc.xml)

代码如下：

<?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/beanshttp://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/aophttp://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.Kissship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.Kissship"/><!--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，会经过切面的拦截处理--><aop:aspectj-autoproxy/>
</beans>

2.4.7 编写tag助手标签类

PageTag：

package com.Kissship.tag;import com.Kissship.utils.PageBean;import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;public class PageTag extends BodyTagSupport{private PageBean pageBean;// 包含了所有分页相关的元素public PageBean getPageBean() {return pageBean;}public void setPageBean(PageBean pageBean) {this.pageBean = pageBean;}@Overridepublic int doStartTag() throws JspException {
//		没有标签体，要输出内容JspWriter out = pageContext.getOut();try {out.print(toHTML());} catch (IOException e) {e.printStackTrace();}return super.doStartTag();}private String toHTML() {StringBuffer sb = new StringBuffer();
//		隐藏的form表单---这个就是上一次请求下次重新发的奥义所在
//		上一次请求的URLsb.append("<form action='"+pageBean.getUrl()+"' id='pageBeanForm' method='post'>");sb.append("	<input type='hidden' name='page'>");
//		上一次请求的参数Map<String, String[]> paramMap = pageBean.getMap();if(paramMap != null && paramMap.size() > 0) {Set<Entry<String, String[]>> entrySet = paramMap.entrySet();for (Entry<String, String[]> entry : entrySet) {
//				参数名String key = entry.getKey();
//				参数值for (String value : entry.getValue()) {
//					上一次请求的参数，再一次组装成了新的Form表单
//					注意：page参数每次都会提交，我们需要避免if(!"page".equals(key)) {sb.append("	<input type='hidden' name='"+key+"' value='"+value+"' >");}}}}sb.append("</form>");//		分页条sb.append("<ul class='pagination justify-content-center'>");sb.append("	<li class='page-item "+(pageBean.getPage() == 1 ? "disabled" : "")+"'><a class='page-link'");sb.append("	href='javascript:gotoPage(1)'>首页</a></li>");sb.append("	<li class='page-item "+(pageBean.getPage() == 1 ? "disabled" : "")+"'><a class='page-link'");sb.append("	href='javascript:gotoPage("+pageBean.getPreivousPage()+")'>&lt;</a></li>");// less than 小于号
//		sb.append("	<li class='page-item'><a class='page-link' href='#'>1</a></li>");
//		sb.append("	<li class='page-item'><a class='page-link' href='#'>2</a></li>");sb.append("	<li class='page-item active'><a class='page-link' href='#'>"+pageBean.getPage()+"</a></li>");sb.append("	<li class='page-item "+(pageBean.getPage() == pageBean.getMaxPage() ? "disabled" : "")+"'><a class='page-link' href='javascript:gotoPage("+pageBean.getNextPage()+")'>&gt;</a></li>");sb.append("	<li class='page-item "+(pageBean.getPage() == pageBean.getMaxPage() ? "disabled" : "")+"'><a class='page-link' href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a></li>");sb.append("	<li class='page-item go-input'><b>到第</b><input class='page-link'");sb.append("	type='text' id='skipPage' name='' /><b>页</b></li>");sb.append("	<li class='page-item go'><a class='page-link'");sb.append("	href='javascript:skipPage()'>确定</a></li>");sb.append("	<li class='page-item'><b>共"+pageBean.getTotal()+"条</b></li>");sb.append("</ul>");//		分页执行的JS代码sb.append("<script type='text/javascript'>");sb.append("	function gotoPage(page) {");sb.append("		document.getElementById('pageBeanForm').page.value = page;");sb.append("		document.getElementById('pageBeanForm').submit();");sb.append("	}");sb.append("	function skipPage() {");sb.append("		var page = document.getElementById('skipPage').value;");sb.append("		if (!page || isNaN(page) || parseInt(page) < 1 || parseInt(page) > "+pageBean.getMaxPage()+") {");sb.append("			alert('请输入1~"+pageBean.getMaxPage()+"的数字');");sb.append("			return;");sb.append("		}");sb.append("		gotoPage(page);");sb.append("	}");sb.append("</script>");return sb.toString();}
}

2.4.8 引入tld标签库

kissship.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>kissship 1.1 core library</description><display-name>kissship core</display-name><tlib-version>1.1</tlib-version><short-name>kissship</short-name><uri>http://jsp.veryedu.cn</uri><tag><name>page</name><tag-class>com.Kissship.tag.PageTag</tag-class><body-content>JSP</body-content><attribute><name>pageBean</name><required>true</required><rtexprvalue>true</rtexprvalue></attribute></tag></taglib>

2.4.9 编写controller类

MusicController：

package com.Kissship.web;import com.Kissship.biz.MusicBiz;
import com.Kissship.model.Music;
import com.Kissship.utils.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 Kissship* @site www.Kissship.com* @company xxx公司* @create 2023-09-08-15:15*/
@Controller
@RequestMapping("/mic")
public class MusicController {@Autowiredprivate MusicBiz musicBiz;// 增@RequestMapping("/add")public String add(Music music, HttpServletRequest Request) {int i = musicBiz.insertSelective(music);return "redirect:list";}// 删@RequestMapping("/del/{bid}")public String del(@PathVariable("bid")Integer bid) {musicBiz.deleteByPrimaryKey(bid);return "redirect:/mic/list";}// 改@RequestMapping("/edit")public String edit(Music music, HttpServletRequest Request) {musicBiz.updateByPrimaryKeySelective(music);return "redirect:list";}// 查@RequestMapping("/list")public String list(Music music, HttpServletRequest Request) {//music是用来接受前台传递后台的参数PageBean pageBean = new PageBean();pageBean.setRequest(Request);List<Music> music1 = musicBiz.listPager(music, pageBean);Request.setAttribute("lst", music1);Request.setAttribute("pageBean", pageBean);//WEB-INF/jsp/mic/list.jspreturn "mic/list";}//数据回显@RequestMapping("/preSave")public String preSave(Music music, Model model) {if (music != null && music.getMid() != null && music.getMid() != 0) {Music m = musicBiz.selectByPrimaryKey(music.getMid());model.addAttribute("c",m);}return "mic/edit";}
}

到此我们的后台代码编写完成了，接下来就是前端代码的编写。 

2.5 前台代码

2.5.1 主页面编写

作用：展示数据进行一系列操作。

list.jsp：

<%@ 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>JayChou歌单列表</title><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>
<form class="form-inline"action="${pageContext.request.contextPath }/mic/list" method="post"><div class="form-group mb-2"><input type="text" class="form-control-plaintext" name="mname"placeholder="请输入歌曲名称"><!-- 			<input name="rows" value="20" type="hidden"> --><!-- 不想分页 -->
<%--        <input name="pagination" value="false" type="hidden">--%></div><button type="submit" class="btn btn-primary mb-2">查询</button><a class="btn btn-primary mb-2" href="${pageContext.request.contextPath }/mic/preSave">新增</a>
</form><table class="table table-striped"><thead><tr><th scope="col">歌曲编号</th><th scope="col">歌曲名称</th><th scope="col">歌曲专辑</th><th scope="col">歌曲歌词</th><th scope="col">歌曲图片</th></tr></thead><tbody><c:forEach  var="b" items="${lst }"><tr><td>${b.mid }</td><td>${b.mname }</td><td>${b.mtype }</td><td>${b.minfo }</td><td>${b.mpic }</td><td><a href="${pageContext.request.contextPath }/mic/preSave?mid=${b.mid}">修改</a><a href="${pageContext.request.contextPath }/mic/del/${b.mid}">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>
${pageBean }
</body>
</html>

 2.5.2 修改界面编写

作用：操作数据。

edit.jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>编辑歌单界面</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/${empty c ? 'mic/add' : 'mic/edit'}" method="post">歌曲编号:<input type="text" name="mid" value="${c.mid }"><br>歌曲名称:<input type="text" name="mname" value="${c.mname }"><br>歌曲专辑:<input type="text" name="mtype" value="${c.mtype }"><br>歌曲歌词:<input type="text" name="minfo" value="${c.minfo }"><br>歌曲图片:<input type="text" name="mpic" value="${c.mpic }"><br><input type="submit">
</form>
</body>
</html>

三、展示效果

控制台效果：

 主页增删改查展示效果：

四、实战SpringMVC增删改查的收获

1. 熟悉SpringMVC框架：通过实践，可以更深入地理解SpringMVC框架的工作原理和核心概念，如控制器、视图解析器、数据绑定等。

2. 掌握请求处理和数据交互：实践中的增删改查操作涉及到请求处理和数据库数据交互，可以加深对请求的处理方式和数据库操作的理解。

3. 强化编程技能：实战中需要编写具体的代码实现增删改查功能，可以提高编程能力，尤其是对Java和SpringMVC的理解和熟练度。

4. 学习最佳实践：通过实践，可以学习到SpringMVC增删改查的最佳实践，包括使用合适的设计模式、优化数据库查询性能、错误处理等方面的经验。

5. 增加项目经验：实战增删改查可以让您在实际项目中积累经验，对项目的整体流程和开发周期有更深入的认识。

6. 提升自信心：通过实际操作和实践，可以提高对SpringMVC增删改查功能的自信心，为日后更复杂的项目开发打下基础。

请注意，SpringMVC是一个开源框架，通过参与实战项目可以更好地理解和应用它。同时，实践中也会遇到挑战和问题，但通过解决问题和学习，可以不断进步和成长。

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最后实战SpringMVC之CRUD就到这里，祝大家在敲代码的路上一路通畅!

感谢大家的观看 !