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Springboot整合FreeMarker的实现示例

作者：爱嘤斯塔　　发布时间：2023-04-09 00:57:57　

标签：Springboot,整合,FreeMarker

一、项目搭建

1、新建模块

2、导入依赖：将不相关的依赖删掉

<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper-spring-boot-starter</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0</version>
<scope>compile</scope>
</dependency>

3、新建软件包，放入student实体类

package com.lv.code.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

/**
* 学生表student
* @author hgh
* @date 2022-01-21T13:35:43.912
*/
@Data
@NoArgsConstructor
@AllArgsConstructor
@Accessors(chain = true)
public class Student {
/**
* 学生编号主键自增
*/
private Long stuId;

/**
* 学生名字
*/
private String stuName;

/**
* 学生电话
*/
private String stuPhone;

/**
* 学生班级
*/
private Long stuClass;

/**
* 学生地址
*/
private String stuAddress;
}

4、新建StudentMapper接口

package com.lv.code.mapper;

import com.lv.code.pojo.Student;
import org.springframework.stereotype.Repository;
import tk.mybatis.mapper.common.Mapper;

@Repository
public interface StudentMapper extends Mapper<Student> {

}

5、Springboot04Application内引用mapper

package com.lv.code;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan("com.lv.code.mapper")
public class Springboot04Application {

public static void main(String[] args) {
SpringApplication.run(Springboot04Application.class, args);
}

}

6、application.yml文件配置

server:
port: 8080
# 配置数据源
spring:
datasource:
username: root
password: 123456
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/aaa?userSSL=false&serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&allowPublicKeyRetrieval=true
# 日志打印
logging:
level:
com.lv.code.mapper: debug

7、测试

Springboot04ApplicationTests：

package com.lv.code;

import com.lv.code.mapper.StudentMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class Springboot04ApplicationTests {
@Autowired
StudentMapper mapper;

@Test
void contextLoads() {
System.out.println(mapper.selectAll());
}

}

8、将切面、util包、启动器导入

导入依赖

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.10</version>
</dependency>

切面PageAspect：

package com.lv.code.aspect;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.lv.code.util.PageBean;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

/**
* @author yk
*/
@Component
@Aspect
@Slf4j
public class PageAspect {

@Around(value = "execution(* *..*Service.*Pager(..))")
public Object invoke(ProceedingJoinPoint point) throws Throwable {
PageBean pageBean = null;
for (Object e : point.getArgs()) {
if (e instanceof PageBean) {
pageBean = (PageBean) e;
break;
}
}
if (pageBean != null && pageBean.isPagination()) {
PageHelper.startPage(pageBean.getPage(), pageBean.getRows());
}
Object obj = point.proceed(point.getArgs());
if (obj != null) {
if (obj instanceof Page) {
Page page = (Page) obj;
PageInfo pageInfo = new PageInfo(page);
pageBean.setTotal(new Long(pageInfo.getTotal()).intValue());
return pageInfo.getList();
}
}
return obj;
}

}

util包中的PageBean类

package com.lv.code.util;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

/**
* @author 银喾
*/
@Data
@NoArgsConstructor
@AllArgsConstructor
public class PageBean {

private int total;
private int page = 1;
private int rows = 5;
private boolean pagination = true;
private String url;
private Map<String, String[]> ms;

public void setMs(Map<String, String[]> ms) {
this.ms = ms;
}

public int calcStartIndex() {
return (page - 1) * rows;
}

public int calcMaxPage() {
return total ％ rows == 0 ? total / rows : total / rows + 1;
}

public int nextPage() {
return Math.min(page + 1, calcMaxPage());
}

public int prevPage() {
return Math.max(page - 1, 1);
}

public void setRequest(HttpServletRequest req) {
setUrl(req.getRequestURL().toString());
setMs(req.getParameterMap());
String page = req.getParameter("page");
if (page == null) {
setPage(1);
} else {
setPage(Integer.parseInt(page));
}
String rows = req.getParameter("rows");
if (rows == null) {
setRows(5);
} else {
setRows(Integer.parseInt(rows));
}
String pagination = req.getParameter("pagination");
if ("false".equals(pagination)) {
setPagination(false);
}
}

}

9、新建service层

新建StudentService接口：

package com.lv.code.service;

import com.lv.code.pojo.Student;
import com.lv.code.util.PageBean;

import java.util.List;

public interface StudentService {

List<Student> findPager(PageBean pageBean);

}

实现StudentService接口：StudentServiceImpl

package com.lv.code.service;

import com.lv.code.mapper.StudentMapper;
import com.lv.code.pojo.Student;
import com.lv.code.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class StudentServiceImpl implements StudentService {
@Autowired
private StudentMapper mapper;

@Override
public List<Student> findPager(PageBean pageBean) {
return mapper.selectAll();
}
}

10、新建controller层

StudentController类：

package com.lv.code.controller;

import com.github.pagehelper.PageRowBounds;
import com.lv.code.service.StudentService;
import com.lv.code.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;

@RestController
public class StudentController {
@Autowired
private StudentService service;

@GetMapping
public Object find(HttpServletRequest request){
PageBean pageBean=new PageBean();
pageBean.setRequest(request);
return service.findPager(pageBean);
}

}

11、运行启动类Springboot04Application，访问localhost：8080网址

二、freemarker介绍

1、新建资源文件application.yml

更改配置文件,添加freemarker配置

server:
port: 8080
# 配置数据源
spring:
datasource:
username: root
password: 123456
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/aaa?userSSL=false&serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&allowPublicKeyRetrieval=true
freemarker:
#指定HttpServletRequest的属性是否可以覆盖controller的model的同名项
allow-request-override: false
#req访问request
request-context-attribute: req
#后缀名freemarker默认后缀为.ftl，当然你也可以改成自己习惯的.html
suffix: .ftl
#设置响应的内容类型
content-type: text/html;charset=utf-8
#是否允许mvc使用freemarker
enabled: true
#是否开启template caching
cache: false
#设定模板的加载路径，多个以逗号分隔，默认: [ “classpath:/templates/” ]
template-loader-path: classpath:/templates/
#设定Template的编码
charset: UTF-8
# 日志打印
logging:
level:
com.lv.code.mapper: debug