Springboot如何整合FreeMarker

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一、项目搭建

1、新建模块

2、导入依赖 ：将不相关的依赖删掉

                     tk.mybatis            mapper-spring-boot-starter            2.0.2                            javax.persistence            persistence-api            1.0            compile        

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; @Repositorypublic interface StudentMapper extends Mapper { }

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; @SpringBootTestclass 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

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

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@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;    } }

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@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、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 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; @Servicepublic class StudentServiceImpl implements StudentService {    @Autowired    private StudentMapper mapper;     @Override    public List 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; @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、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

2、模板语法

3、在资源文件中的templates文件下新建index.ftl文件

增加模块：

然后可选中freemarker直接生成ftl文件

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