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;
}
@Override
public 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/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://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;
}
@Override
public 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URL
sb.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()+")'><</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()+")'>></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 {
@Autowired
private 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.jsp
return "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">
<link
href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css"
rel="stylesheet">
<script
src="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
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。
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。
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。
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。
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。
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。
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!
