目录
一、Freemarker入门
SpringBoot默认是不推荐使用jsp的，本身就是向前端推送数据。
学习网址： http://freemarker.foofun.cn/
项目创建如下：
六个组件
生成后相关配置稍作调整
yml文件：
mybatis:
mapper-locations: classpath:mapper/*xml
type-aliases-package: com.ljj.spboot04.mybatis.entity
server:
port: 8080
spring:
application:
name: spboot04
datasource:
driver-class-name: com.mysql.jdbc.Driver
name: defaultDataSource
password: 123456
url: jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
username: root
freemarker:
cache: false
charset: utf-8
expose-request-attributes: true
expose-session-attributes: true
suffix: .ftl
template-loader-path: classpath:/templates/
# resources:
# static-locations: classpath:/static/# 应用服务 WEB 访问端口
mvc:
static-path-pattern: classpath:/static/接着，
自己编写一个以ftl为后缀的类
，对应配置中的suffix：.ftl
创建index.ftl
编写一个方法用于访问ftl页面
IndexController
package com.ljj.spboot04.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* @author ljj
* @site www.xiaomage.com
* @company
* @create 2022-11-06 20:40
*/
@Controller
public class IndexController {
@RequestMapping("/")
public String index(){
System.out.println("come in 。。。 ");
// suffix: .ftl
// template-loader-path: classpath:/templates/
// /templates/index.ftl
return "index";
}
}
访问成功
二、Freemarker的基本语法
只需四个类
indexController用于传递参数与访问index.ftl
user用于储存对象数组
head.ftl编写一个局部变量和全局变量供index.ftl获取
index.ftl编写语法和效果展示
修改一下配置，访问路径发生改变
index.ftl
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h2>1.取值</h2>
<h3>1.1. 提供默认值</h3>
<#--报错 当接收的参数值不为空会报错，这个问题是需要避免的-->
<#--${uname} -->
<#--不报错，但是页面无内容-->
<#--${uname !}-->
<#--给值设置一个默认值-->
${uname! '无名'}
<h3>1.2. 对null值先进行判断</h3>
<p>1）exists用在逻辑判断；</p>
<#if uname?exists>
${uname}
</#if>
<br>
<p>2）??是判断对象是否为空</p>
<#if uname??>
${uname}
</#if>
<br>
<p>3）if_exists用来打印东西</p>
${uname?if_exists}
<br>
<h3>2.条件</h3>
<#if sex=='nv'>
女
<#elseif sex='nan'>
男
<#else>
未知
</#if>
<br>
<h3>3.循环</h3>
<p>1）取出数组中的元素</p>
<#list arr as a>
${a}==
</#list>
<br>
<p>2）取出集合中的对象（注：访问的类要被public所修饰）</p>
<#list users as item>
${item.id} : ${item.name} <br>
</#list>
<h3>4 include</h3>
<#include '/head.ftl'>
<h3>5 局部变量(assign)/全局变量(global)</h3>
${ctx}：${ctx2}
</body>
</html>IndexController.java
package com.ljj.spboot04.controller;
import com.ljj.spboot04.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import java.util.Arrays;
/**
* @author ljj
* @site www.xiaomage.com
* @company
* @create 2022-11-06 20:40
*/
@Controller
public class IndexController {
@RequestMapping("/")
public String index(Model model){
model.addAttribute("sex","nan");
model.addAttribute("users", Arrays.asList(new User(1,"zs")
,new User(2,"ls"),new User(3,"ww")));
model.addAttribute("arr",new Integer[]{3,4,5,6,7,8,9});
System.out.println("Come in ....");
// suffix: .ftl
// template-loader-path: classpath:/templates/
// /templates/index.ftl
return "index";
}
}
User
package com.ljj.spboot04.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User{
private int id;
private String name;
}head.ftl
通过这两个标签获取路径
<#assign ctx>
${springMacroRequestContext.contextPath}
</#assign>
<#global ctx2>
${springMacroRequestContext.contextPath}
</#global>运行项目后返回index.ftl获取到的数据
三，Freemarker综合案例
利用Freemarker完成基本的增删改查，参照之前ssm项目进行改造
实现步骤：
1、entity、Mapper.java、Mapper.xml、biz、Controller
2、整合aop PageHelper插件
3、jsp——>freemarker
4、jsp中是有分页标签<z:page pagebean=”${pagebean}”/> ——> freemarker中的分页条展示问题，以及分页功能
SpringBoot aop整合分页，
添加pom如下：
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency> 完整版依赖：
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ljj</groupId>
<artifactId>spboot04</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spboot04</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-boot.version>2.3.7.RELEASE</spring-boot.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.44</version>
</dependency>
<!--支持aop-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!--支持分页 pageHelper-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.3.7.RELEASE</version>
<configuration>
<mainClass>com.ljj.spboot04.Spboot04Application</mainClass>
</configuration>
<executions>
<execution>
<id>repackage</id>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
把如下配置加到yml文件中
pagehelper:
reasonable: true
supportMethodsArguments: true
page-size-zero: true
helper-dialect: mysql
mybatis:
mapper-locations: classpath:mapper/*xml
type-aliases-package: com.ljj.spboot04.model
server:
port: 8080
servlet:
context-path: /spboot04
spring:
application:
name: spboot04
datasource:
driver-class-name: com.mysql.jdbc.Driver
name: defaultDataSource
password: 123456
url: jdbc:mysql://localhost:3306/mybatis_ssm?useUnicode=true&characterEncoding=UTF-8
username: root
freemarker:
cache: false
charset: utf-8
expose-request-attributes: true
expose-session-attributes: true
suffix: .ftl
template-loader-path: classpath:/templates/
# resources:
# static-locations: classpath:/static/# 应用服务 WEB 访问端口
mvc:
static-path-pattern: classpath:/static/
x pagehelper:
reasonable: true
supportMethodsArguments: true
page-size-zero: true
helper-dialect: mysql实体类Clazz.java：
package com.ljj.spboot04.model;
/**
* NotNull:针对的是基本数据类型
*
* @NotEmpty 作用于集合
* @NotBlank 作用于字符串
*/
public class Clazz {
protected Integer cid;
protected String cname;
protected String cteacher;
protected String pic;
public Clazz(Integer cid, String cname, String cteacher, String pic) {
this.cid = cid;
this.cname = cname;
this.cteacher = cteacher;
this.pic = pic;
}
public Clazz() {
super();
}
public Integer getCid() {
return cid;
}
public void setCid(Integer cid) {
this.cid = cid;
}
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public String getCteacher() {
return cteacher;
}
public void setCteacher(String cteacher) {
this.cteacher = cteacher;
}
public String getPic() {
return pic;
}
public void setPic(String pic) {
this.pic = pic;
}
}ClazzBiz
package com.ljj.spboot04.biz;
import com.ljj.spboot04.model.Clazz;
import com.ljj.spboot04.util.PageBean;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import java.util.List;
import java.util.Map;
public interface ClazzBiz {
int deleteByPrimaryKey(Integer cid);
int insert(Clazz record);
int insertSelective(Clazz record);
Clazz selectByPrimaryKey(Integer cid);
int updateByPrimaryKeySelective(Clazz record);
int updateByPrimaryKey(Clazz record);
List<Clazz> listPager(Clazz clazz, PageBean pageBean);
List<Map> listMapPager(Clazz clazz, PageBean pageBean);
}ClazzMapper.java:
package com.ljj.spboot04.mapper;
import com.ljj.spboot04.model.Clazz;
import org.springframework.stereotype.Repository;
import java.util.List;
import java.util.Map;
@Repository
public interface ClazzMapper {
int deleteByPrimaryKey(Integer cid);
int insert(Clazz record);
int insertSelective(Clazz record);
Clazz selectByPrimaryKey(Integer cid);
List<Clazz> listPager(Clazz clazz);
List<Map> listMapPager(Clazz clazz);
int updateByPrimaryKeySelective(Clazz record);
int updateByPrimaryKey(Clazz record);
}ClazzMapper.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.ljj.spboot04.mapper.ClazzMapper">
<resultMap id="BaseResultMap" type="com.ljj.spboot04.model.Clazz">
<constructor>
<idArg column="cid" jdbcType="INTEGER" javaType="java.lang.Integer"/>
<arg column="cname" jdbcType="VARCHAR" javaType="java.lang.String"/>
<arg column="cteacher" jdbcType="VARCHAR" javaType="java.lang.String"/>
<arg column="pic" jdbcType="VARCHAR" javaType="java.lang.String"/>
</constructor>
</resultMap>
<sql id="Base_Column_List">
cid, cname, cteacher, pic
</sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer">
select
<include refid="Base_Column_List"/>
from t_struts_class
where cid = #{cid,jdbcType=INTEGER}
</select>
<select id="listMapPager" resultType="java.util.Map" parameterType="com.ljj.spboot04.model.Clazz">
select
<include refid="Base_Column_List"/>
from t_struts_class
<where>
<if test="cname != null and cname != ''">
and cname like CONCAT('%',#{cname},'%')
</if>
<if test="cid != null and cid != ''">
and cid = #{cid}
</if>
</where>
</select>
<select id="listPager" resultType="com.ljj.spboot04.model.Clazz" parameterType="com.ljj.spboot04.model.Clazz">
select
<include refid="Base_Column_List"/>
from t_struts_class
<where>
<if test="cname != null and cname != ''">
and cname like CONCAT('%',#{cname},'%')
</if>
<if test="cid != null and cid != ''">
and cid = #{cid}
</if>
</where>
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
delete from t_struts_class
where cid = #{cid,jdbcType=INTEGER}
</delete>
<insert id="insert" parameterType="com.ljj.spboot04.model.Clazz">
insert into t_struts_class (cid, cname, cteacher,
pic)
values (#{cid,jdbcType=INTEGER}, #{cname,jdbcType=VARCHAR}, #{cteacher,jdbcType=VARCHAR},
#{pic,jdbcType=VARCHAR})
</insert>
<insert id="insertSelective" parameterType="com.ljj.spboot04.model.Clazz">
insert into t_struts_class
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="cid != null">
cid,
</if>
<if test="cname != null">
cname,
</if>
<if test="cteacher != null">
cteacher,
</if>
<if test="pic != null">
pic,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides=",">
<if test="cid != null">
#{cid,jdbcType=INTEGER},
</if>
<if test="cname != null">
#{cname,jdbcType=VARCHAR},
</if>
<if test="cteacher != null">
#{cteacher,jdbcType=VARCHAR},
</if>
<if test="pic != null">
#{pic,jdbcType=VARCHAR},
</if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.ljj.spboot04.model.Clazz">
update t_struts_class
<set>
<if test="cname != null">
cname = #{cname,jdbcType=VARCHAR},
</if>
<if test="cteacher != null">
cteacher = #{cteacher,jdbcType=VARCHAR},
</if>
<if test="pic != null">
pic = #{pic,jdbcType=VARCHAR},
</if>
</set>
where cid = #{cid,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.ljj.spboot04.model.Clazz">
update t_struts_class
set cname = #{cname,jdbcType=VARCHAR},
cteacher = #{cteacher,jdbcType=VARCHAR},
pic = #{pic,jdbcType=VARCHAR}
where cid = #{cid,jdbcType=INTEGER}
</update>
</mapper>ClazzController.java：
package com.ljj.spboot04.controller;
import com.ljj.spboot04.biz.ClazzBiz;
import com.ljj.spboot04.model.Clazz;
import com.ljj.spboot04.util.FreemarkerPageHelper;
import com.ljj.spboot04.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
/**
* @author小李飞刀
* @site www.javaxl.com
* @company xxx公司
* @create 2022-08-17 15:23
*/
@Controller
@RequestMapping("/clz")
public class ClazzController {
@Autowired
private ClazzBiz clazzBiz;
// list->clzList
// toList->重定向list->"redirect:/clz/list"
// toEdit->跳转到编辑界面->clzEdit
// Clazz : 以前是通过模型驱动接口封装，现在是直接在方法中接受参数即可
@RequestMapping("/list")
public String list(Clazz clazz, HttpServletRequest request) {
System.out.println("我添加了 新的代码,终于不重启了....");
PageBean pageBean = new PageBean();
pageBean.setRequest(request);
List<Clazz> lst = this.clazzBiz.listPager(clazz, pageBean);
request.setAttribute("lst", lst);
request.setAttribute("pageBean", pageBean);
return "clz/clzList";
}
@RequestMapping("/toEdit")
public String toEdit(Clazz clazz, HttpServletRequest request) {
Integer cid = clazz.getCid();
// 传递的id代表了修改，没传代表新增
if (cid != null) {
List<Clazz> lst = this.clazzBiz.listPager(clazz, null);
request.setAttribute("b", lst.get(0));
}
return "clz/clzEdit";
}
@RequestMapping("/add")
public String add(Clazz clazz) {
this.clazzBiz.insertSelective(clazz);
return "redirect:/clz/list";
}
@RequestMapping("/edit")
public String edit(Clazz clazz) {
this.clazzBiz.updateByPrimaryKeySelective(clazz);
return "redirect:/clz/list";
}
@RequestMapping("/del")
public String del(Clazz clazz) {
this.clazzBiz.deleteByPrimaryKey(clazz.getCid());
return "redirect:/clz/list";
}
}
PagerAspect ：
package com.ljj.spboot04.aspect;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.ljj.spboot04.util.PageBean;
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;
@Component
@Aspect
public class PagerAspect {
/**
* *：返回值类型
* *..：无限包
* *Service：以Service结尾接口名
* *Pager：以Pager方法
* 只要同时匹配上诉四个条件，就会被列为目标对象
* 上述配置要生效，代理注解<aop:aspectj-autoproxy/>不能少
*
* @param args
* @return
* @throws Throwable
*/
@Around("execution(* *..*Biz.*Pager(..))")
public Object invoke(ProceedingJoinPoint args) throws Throwable {
Object[] params = args.getArgs();
PageBean pageBean = null;
for (Object param : params) {
if (param instanceof PageBean) {
pageBean = (PageBean) param;
break;
}
}
if (pageBean != null && pageBean.isPagination())
PageHelper.startPage(pageBean.getPage(), pageBean.getRows());
// 执行目标方法
Object list = args.proceed(params);
if (null != pageBean && pageBean.isPagination()) {
PageInfo pageInfo = new PageInfo((List) list);
pageBean.setTotal(pageInfo.getTotal() + "");
}
return list;
}
}
StringUtils ：
package com.ljj.spboot04.util;
public class StringUtils {
// 私有的构造方法，保护此类不能在外部实例化
private StringUtils() {
}
/**
* 如果字符串等于null或去空格后等于""，则返回true，否则返回false
*
* @param s
* @return
*/
public static boolean isBlank(String s) {
boolean b = false;
if (null == s || s.trim().equals("")) {
b = true;
}
return b;
}
/**
* 如果字符串不等于null或去空格后不等于""，则返回true，否则返回false
*
* @param s
* @return
*/
public static boolean isNotBlank(String s) {
return !isBlank(s);
}
}
PageBean
package com.ljj.spboot04.util;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
/**
* 分页工具类
*/
public class PageBean {
private int page = 1;// 页码
private int rows = 10;// 页大小
private int total = 0;// 总记录数
private boolean pagination = true;// 是否分页
private String url; //保存上一次请求的URL
private Map<String, String[]> paramMap = new HashMap<>();// 保存上一次请求的参数
/**
* 初始化pagebean的，保存上一次请求的重要参数
*
* @param req
*/
public void setRequest(HttpServletRequest req) {
// 1.1 需要保存上一次请求的URL
this.setUrl(req.getRequestURL().toString());
// 1.2 需要保存上一次请求的参数 bname、price
this.setParamMap(req.getParameterMap());
// 1.3 需要保存上一次请求的分页设置 pagination
this.setPagination(req.getParameter("pagination"));
// 1.4 需要保存上一次请求的展示条目数
this.setRows(req.getParameter("rows"));
// 1.5 初始化请求的页码 page
this.setPage(req.getParameter("page"));
}
public void setPage(String page) {
if (StringUtils.isNotBlank(page))
this.setPage(Integer.valueOf(page));
}
public void setRows(String rows) {
if (StringUtils.isNotBlank(rows))
this.setRows(Integer.valueOf(rows));
}
public void setPagination(String pagination) {
// 只有在前台jsp填写了pagination=false，才代表不分页
if (StringUtils.isNotBlank(pagination))
this.setPagination(!"false".equals(pagination));
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public Map<String, String[]> getParamMap() {
return paramMap;
}
public void setParamMap(Map<String, String[]> paramMap) {
this.paramMap = paramMap;
}
public PageBean() {
super();
}
public int getPage() {
return page;
}
public void setPage(int page) {
this.page = page;
}
public int getRows() {
return rows;
}
public void setRows(int rows) {
this.rows = 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 pagination;
}
public void setPagination(boolean pagination) {
this.pagination = pagination;
}
/**
* 获得起始记录的下标
*
* @return
*/
public int getStartIndex() {
return (this.page - 1) * this.rows;
}
/**
* 最大页
*
* @return
*/
public int maxPage() {
// total % rows == 0 ? total / rows : total / rows +1
return this.total % this.rows == 0 ? this.total / this.rows : this.total / this.rows + 1;
}
/**
* 下一页
*
* @return
*/
public int nextPage() {
// 如果当前页小于最大页，那就下一页为当前页+1；如果不小于，说明当前页就是最大页，那就无需+1
return this.page < this.maxPage() ? this.page + 1 : this.page;
}
/**
* 上一页
*
* @return
*/
public int previousPage() {
return this.page > 1 ? this.page - 1 : this.page;
}
@Override
public String toString() {
return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", pagination=" + pagination + "]";
}
}
前端页面处理：
clzList.ftl
<!DOCTYPE html>
<html lang="en">
<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>班级列表</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>
<#include '/head.ftl'/>
<#--查询的条件框-->
<form class="form-inline"
action="${ctx }/clz/list" method="post">
<div class="form-group mb-2">
<input type="text" class="form-control-plaintext" name="cname"
placeholder="请输入班级名称">
</div>
<button type="submit" class="btn btn-primary mb-2">查询</button>
<a class="btn btn-primary mb-2" href="${ctx }/clz/toEdit">新增</a>
</form>
<#--数据展示条-->
<table class="table table-striped ">
<thead>
<tr>
<th scope="col">ID</th>
<th scope="col">班级名称</th>
<th scope="col">指导老师</th>
<th scope="col">操作</th>
</tr>
</thead>
<tbody>
<#list lst as b>
<tr>
<td>${b.cid !}</td>
<td>${b.cname !}</td>
<td>${b.cteacher !}</td>
<td>
<a href="${ctx }/clz/toEdit?cid=${b.cid}">修改</a>
<a href="${ctx }/clz/del?cid=${b.cid}">删除</a>
</td>
</tr>
</#list>
</tbody>
</table>
</body>
</html>clzEdit.ftl：
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>编辑界面</title>
</head>
<body>
<#include '/head.ftl' />
<#if b??>
<#--修改-->
<form action="${ctx }/clz/edit" method="post">
cid:<input type="text" name="cid" value="${b.cid !}"><br>
cname:<input type="text" name="cname" value="${b.cname !}"><br>
cteacher:<input type="text" name="cteacher" value="${b.cteacher !}"></span><br>
<input type="submit">
</form>
<#else >
<#--新增-->
<form action="${ctx }/clz/add" method="post">
cid:<input type="text" name="cid" value=""><br>
cname:<input type="text" name="cname" value=""><br>
cteacher:<input type="text" name="cteacher" value=""><br>
<input type="submit">
</form>
</#if>
</body>
</html>此时页面效果如下：
新增
修改
查询
删除
接下来设置分页功能：
用于Freemarker引擎生成分页条的工具类
FreemarkerPageHelper .java：
package com.ljj.spboot04.util;
import java.util.Map;
import java.util.Set;
public class FreemarkerPageHelper {
public static String toHTML(PageBean pageBean) {
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.getParamMap();
if(paramMap != null && paramMap.size() > 0) {
Set<Map.Entry<String, String[]>> entrySet = paramMap.entrySet();
for (Map.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.previousPage()+")'><</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.maxPage() ? "disabled" : "")+"'><a class='page-link' href='javascript:gotoPage("+pageBean.nextPage()+")'>></a></li>");
sb.append(" <li class='page-item "+(pageBean.getPage() == pageBean.maxPage() ? "disabled" : "")+"'><a class='page-link' href='javascript:gotoPage("+pageBean.maxPage()+")'>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.maxPage()+") {");
sb.append(" alert('请输入1~"+pageBean.maxPage()+"的数字');");
sb.append(" return;");
sb.append(" }");
sb.append(" gotoPage(page);");
sb.append(" }");
sb.append("</script>");
return sb.toString();
}
}去controller添加：
还有clzList添加：
分页效果：
版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 举报，一经查实，本站将立刻删除。
文章由极客之音整理，本文链接：https://www.bmabk.com/index.php/post/50989.html
