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This article will explain in detail how Springboot integrates FreeMarker. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

First, build the project. 1. Build a new module

2. Import dependencies: delete the unrelated dependencies tk.mybatis mapper-spring-boot-starter 2.0.2 javax.persistence persistence-api 1.0 compile 3, create a new software package, and put it into the student entity class package com.lv.code.pojo; import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor Import lombok.experimental.Accessors; / * Student form student * @ author hgh * @ date 2022-01-21T13:35:43.912 * / @ Data@NoArgsConstructor@AllArgsConstructor@Accessors (chain = true) public class Student {/ * Student number key self-increment * / private Long stuId; / * Student name * / private String stuName / * Student phone * / private String stuPhone; / * Student Class * / private Long stuClass; / * Student address * / private String stuAddress;} 4, New StudentMapper Interface package com.lv.code.mapper; import com.lv.code.pojo.Student;import org.springframework.stereotype.Repository;import tk.mybatis.mapper.common.Mapper @ Repositorypublic interface StudentMapper extends Mapper {} 5, reference within Springboot04Application mapperpackage 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 file configuration server: port: 808 configuration data source 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# log print logging: level: com.lv.code.mapper: debug7, test

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; @ SpringBootTestclass Springboot04ApplicationTests {@ Autowired StudentMapper mapper; @ Test void contextLoads () {System.out.println (mapper.selectAll ());}}

8. Import the section, util package, and initiator

Import dependency

Org.springframework.boot spring-boot-starter-aop com.github.pagehelper pagehelper-spring-boot-starter 1.2.10

Section 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@Slf4jpublic 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;}}

The PageBean class in the util package

Package com.lv.code.util; import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor; import javax.servlet.http.HttpServletRequest;import java.util.Map; / * * @ author Silver Bank * / @ Data@NoArgsConstructor@AllArgsConstructorpublic class PageBean {private int total; private int page = 1; private int rows = 5; private boolean pagination = true; private String url; private Map ms; public void setMs (Map 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, new service layer

Create a new StudentService API:

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 findPager (PageBean pageBean);}

Implement StudentService interface: 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; @ Servicepublic class StudentServiceImpl implements StudentService {@ Autowired private StudentMapper mapper; @ Override public List findPager (PageBean pageBean) {return mapper.selectAll ()}} 10, create a new controller layer

StudentController class:

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; @ RestControllerpublic class StudentController {@ Autowired private StudentService service; @ GetMapping public Object find (HttpServletRequest request) {PageBean pageBean=new PageBean () PageBean.setRequest (request); return service.findPager (pageBean);}} 11. Run startup class Springboot04Application, visit localhost:8080 URL 2, freemarker introduction 1, create a new resource file application.yml

Change configuration file, add freemarker configuration

Server: port: 808 configuration data source 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: # specify whether the attribute of HttpServletRequest can override the model of controller allow-request-override: false # req access request request-context-attribute: req # suffix name freemarker default suffix is .ftl Of course, you can also change it to your own habit. Html suffix: .ftl # sets the content type of the response content-type: text/html Whether charset=utf-8 # allows mvc to use freemarker enabled: true # whether to enable template caching cache: false # to set the loading path of the template. Multiple templates are separated by commas. Default: ["classpath:/templates/"] template-loader-path: classpath:/templates/ # sets the encoding of Template charset: UTF-8# log printing logging: level: com.lv.code.mapper: debug2, template syntax

3. Create a new index.ftl file under the templates file in the resource file

Add modules:

Then you can select freemarker to generate the ftl file directly

This is the end of the article on "how Springboot integrates FreeMarker". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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