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Springboot整合FreeMarker的实现示例

2022-02-09 16:50:35 作者：爱嘤斯塔

本文主要介绍了Springboot整合FreeMarker的实现示例，文中通过示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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>org.mybatis.spring.boot</groupId>-->
<!--            <artifactId>mybatis-spring-boot-starter</artifactId>-->
<!--            <version>2.1.4</version>-->
<!--        </dependency>-->
 
        <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

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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