第二十一章Springboot进阶Ⅱ

自定义转换器

package com.converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;/** 设置类型转换器,将String类型日期进行转换成Date*/
// 注解声明该类为一个组件类
&＃64;Component
public class DateConverter implements Converter {// 重写方法,进行数据类型转换&＃64;Overridepublic Date convert(String source) {SimpleDateFormat format &＃61; new SimpleDateFormat("yyyy-MM-dd");try {Date date &＃61; format.parse(source);return date;} catch (ParseException e) {System.err.println("格式化日期失败");}return null;}}


package com.converter;import java.util.HashSet;
import java.util.Set;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.support.ConversionServiceFactoryBean;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.converter.Converter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;/** 将自定义的类型转换器进行注册配置*/
// 注解声明该类为一个配置类
&＃64;Configuration
public class ConverterConfig extends WebMvcConfigurerAdapter{/** 配置日期类型转换器:* 方法类型必须为ConversionService,参数为自定义的转换器;* 注解声明按照类型自动注入bean*/&＃64;Bean&＃64;Autowiredpublic ConversionService getConversionService(DateConverter dateConverter){// 创建转换器工厂ConversionServiceFactoryBean factory &＃61; new ConversionServiceFactoryBean();// 创建转换器集合,将转换器放入集合Set converters &＃61; new HashSet();converters.add(dateConverter);// 将转换器集合设置到工厂factory.setConverters(converters);// 返回转换器服务return factory.getObject();}
}


拦截器

package com.merit.inteceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;import java.lang.reflect.Method;/** 设置拦截器,重写方法,对请求进行处理*/
// 注解声明该类为一个组件类
&＃64;Component
public class webInteceptor implements HandlerInterceptor {/*** &＃64;param request 请求* &＃64;param response 响应* &＃64;param handlerMethod 处理方法的封装* &＃64;param exception 异常* &＃64;throws Exception*/&＃64;Overridepublic void afterCompletion(HttpServletRequest request,HttpServletResponse response, Object handlerMethod, Exception exception)throws Exception {HandlerMethod handler &＃61; (HandlerMethod) handlerMethod;// 获取处理请求的方法Method method &＃61; handler.getMethod();System.out.println(method);System.out.println("请求后进行处理.........");}&＃64;Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response,Object handlerMethod, ModelAndView exception) throws Exception {System.out.println("请求时进行处理.........");}&＃64;Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handlerMethod) throws Exception {System.out.println("请求前进行处理.........");/** 返回值:* true:将拦截到的请求进行处理后,释放该请求,其他操作可以继续处理* false:将拦截到的请求进行处理后,不释放该请求,请求中断*/return true;}}

package com.merit.inteceptor;import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;/** 将拦截器处理类进行注册配置;&＃64;Configuration可能会导致页面跳转500,* 可使用&＃64;EnableAutoConfiguration或者&＃64;EnableWebMvc注解解决*/
// 注解声明该类为一个配置类
&＃64;Configuration
public class InteceptorConfig extends WebMvcConfigurerAdapter {//重写addInterceptors方法,将拦截器类进行注册&＃64;Overridepublic void addInterceptors(InterceptorRegistry registry) {// 将拦截器类进行添加注册registry.addInterceptor(new webInteceptor()); }
}

文件上传

          注意&＃xff1a;form表单method&＃61;"post" enctype&＃61;"multipart/form-data"

package com.controller;import java.io.File;
import java.io.IOException;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
/** 文件上传*/
&＃64;Controller
public class LoginController {&＃64;RequestMapping("/login")public String subLogin(&＃64;RequestParam("file") MultipartFile file,HttpServletRequest request){// 获取文件名字String fileName &＃61; file.getOriginalFilename();System.out.println(fileName);// 获取服务器绝对路径String path &＃61; request.getSession().getServletContext().getRealPath("/img/");System.out.println(path);// 创建文件File newFile &＃61; new File(path&＃43;fileName);// 写出文件try {file.transferTo(newFile);} catch (IllegalStateException e) {System.err.println("文件上传失败");} catch (IOException e) {System.err.println("文件传输失败");}return "index";}
}


Springboot整合mybatis

         1. 配置pom.xml依赖


4.0.0com.moMicro0.0.1-SNAPSHOTspringboot-mybatisorg.springframework.bootspring-boot-starter-parent1.5.17.RELEASEorg.springframework.bootspring-boot-starter-webjavax.servletjstlorg.apache.tomcat.embedtomcat-embed-jasperprovidedorg.mybatis.spring.bootmybatis-spring-boot-starter1.1.1mysqlmysql-connector-javacom.alibabadruid1.0.9org.springframework.bootspring-boot-maven-plugin



         2. 在resources下创建和配置全局配置文件:application.properties

spring.mvc.view.prefix&＃61;/WEB-INF/jsp/
spring.mvc.view.suffix&＃61;.jspspring.datasource.driverClassName&＃61;com.mysql.jdbc.Driver
spring.datasource.url&＃61;jdbc:mysql://localhost:3306/ssm?useUnicode&＃61;true&characterEncoding&＃61;UTF-8
spring.datasource.username&＃61;root
spring.datasource.password&＃61;spring.datasource.type&＃61;com.alibaba.druid.pool.DruidDataSource
mybatis.type-aliases-package&＃61;com.entity


         注:配置文件配置页面视图解析,数据库连接信息,数据源类型,映射文件别名

         3. 创建mapper层接口:接口类和xml配置文件名字须一致

package com.mapper;import com.entity.Student;
/** 数据库映射接口:由配置映射文件执行sql语句*/
public interface StudentMapper {public int insert(Student stu);
}




insert into student(sname,score,addr) values(#{sname},#{score},#{addr})



         4. 创建service层业务处理

package com.service;import com.entity.Student;
/** service层接口业务*/
public interface StudentService {public boolean insert(Student stu);
}


package com.service;import javax.annotation.Resource;import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import com.entity.Student;
import com.mapper.StudentMapper;
/** 业务层实现*/
&＃64;Service
// 注解添加事务:在service层添加业务,可以防止操作失败导致数据库数据错误提交
&＃64;Transactional
public class StudentServiceImp implements StudentService {&＃64;Resourceprivate StudentMapper studentMapper;&＃64;Overridepublic boolean insert(Student stu) {int rows &＃61; studentMapper.insert(stu);if (rows > 0) {return true;} else {return false;}}}


         5. 创建controller层进行交互

package com.controller;import javax.annotation.Resource;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import com.entity.Student;
import com.service.StudentService;
/** 控制层:与前台进行交互和页面跳转*/
&＃64;Controller
public class StudentController {&＃64;Resourceprivate StudentService studentService;&＃64;ResponseBody&＃64;RequestMapping("/insert")public String insert(){Student stu &＃61; new Student(null, "Micro", 78, "咸阳");boolean flag &＃61; studentService.insert(stu);if(flag){return "插入成功";}else{return "插入失败";}}
}


                                                                     前行的路上总是充满荆棘和诱惑的, 不忘初心,坚持,就会看到希望

                                                                                                                                                                             ----墨渐生微