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Spring MVC EL表达式不能使用问题 1.在jsp页面添加 isELIgnored="false"，EL是关闭的，必须手动打开<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" isELIgnored="false"%>2.更改web.xml文件（推荐使用）<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">这样在运行项目，在页面就可以获取${name}里的值了 -
Spring MVC利用Ajax上传图片 html<input type="file" onchange="imageUpload(this)" class="form-control" placeholder="点击按钮选择图片"id="pictureUpload">Ajaxfunction imageUpload(obj) { //判断图片格式 var fileName=obj.value; var suffixIndex=fileName.lastIndexOf("."); var suffix=fileName.substring(suffixIndex+1).toUpperCase(); if(suffix!="BMP"&&suffix!="JPG"&&suffix!="JPEG"&&suffix!="PNG"&&suffix!="GIF"){ layer.msg( "请上传图片（格式BMP、JPG、JPEG、PNG、GIF等）!"); var file = $("#pictureUpload"); file.after(file.clone().val("")); file.remove(); return; } var formData = new FormData(); formData.append('file', $('#pictureUpload')[0].files[0]); //添加图片信息的参数 $.ajax({ type: "POST", url: "/fileUploadPage.do", data:formData, cache: false, //上传文件不需要缓存 processData: false,// 告诉jQuery不要去处理发送的数据 contentType: false,// 告诉jQuery不要去设置Content-Type请求头 encType:"multipart/form-data", success: function(data) { alert(data) } }); }Controller @RequestMapping(value = "/fileUploadPage.do", method = RequestMethod.POST) @ResponseBody public String upload(HttpServletRequest req) throws Exception{ MultipartHttpServletRequest mreq = (MultipartHttpServletRequest)req; MultipartFile file = mreq.getFile("file"); String fileName = file.getOriginalFilename(); SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); String name=req.getSession().getServletContext().getRealPath("/")+ "upload\\"+sdf.format(new Date())+fileName.substring(fileName.lastIndexOf('.')); FileOutputStream fos = new FileOutputStream(name); fos.write(file.getBytes()); fos.flush(); fos.close(); return name; }在spring.xml中添加 <!--配置MultipartResolver:用于处理表单中的file--> <!-- 文件上传配置，这里id的名称固定写法 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="defaultEncoding" value="UTF-8"></property> <!--请求的编码格式--> <property name="maxUploadSize" value="102400000"></property> <!--文件最大大小(字节) 1024*1024*50=50M--> <property name="resolveLazily" value="true"/> <!--resolveLazily属性启用是为了推迟文件解析，以便捕获文件大小异常--> <property name="uploadTempDir" value="upload"></property> <!--指定上传文件的临时文件夹，请在项目中创建好目录。--> </bean>
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Spring Boot 整合之模板引擎（jsp、Freemarker 、Thymeleaf ） 整合JSP模板 添加依赖创建 maven 工程，在 pom.xml 文件中添加如下依赖：<dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> </dependency>创建目录和配置文件1. JSP页面放在：/src/main/webapp/WEB-INF/jsp/目录下(webapp/WEB-INF/jsp 没有就自己创建)，如：/src/main/webapp/WEB-INF/jsp/index.jsp 2. CSS或JavaScript之类的静态文件：/src/main/resources/static/目录下，如：/src/main/resources/static/css/main.css 3. 对于属性文件放在：/src/main/resources/目录下，如：/src/main/resources/application.properties 配置application.properties只需要添加这2个就可以了，如下： #页面默认前缀目录spring.mvc.view.prefix=/WEB-INF/jsp/#页面默认后缀目录spring.mvc.view.suffix=.jsp 或在application.yml中：spring节点下面： spring: mvc: view: prefix: /WEB-INF/jsp/ suffix: .jsp 创建JSP页面文件夹在src/main/webapp中的WEB-INF/下创建jsp文件夹，用于存放jsp页面文件。 <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <br> ${map} </body> </html> 编写Controllerpackage club.lygangdai.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import java.util.Map; /** * @author Uncle Liu * @ClassName: TestController * @Description: TODO(类说明 ：) * @date 2018/11/7 11:31 */ @Controller @RequestMapping("/jsp") public class TestController { @RequestMapping("/index") public String hello(Map<String,Object> map) { map.put("map", "Hell"); return "index"; } }结果如下： 整合Freemarker 模板添加 Freemarker 依赖<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-freemarker</artifactId> </dependency> 添加 Freemarker 模板配置在 application.properties 中添加如下内容：spring.freemarker.allow-request-override=false spring.freemarker.cache=true spring.freemarker.check-template-location=true spring.freemarker.charset=UTF-8 spring.freemarker.content-type=text/html spring.freemarker.expose-request-attributes=false spring.freemarker.expose-session-attributes=false spring.freemarker.expose-spring-macro-helpers=false spring.freemarker.prefix= spring.freemarker.suffix=.ftl上述配置都是默认值。编写Controllerpackage club.lygangdai.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import java.util.Map; /** * @author Uncle Liu * @ClassName: FreemarkerController * @Description: TODO(类说明 ：) * @date 2018/11/7 11:32 */ @Controller @RequestMapping("/freemarker") public class FreemarkerController{ @RequestMapping("/hello") public String hello(Map<String,Object> map) { map.put("map", "Hell Freemarker"); return "freemarker"; } }在 templates 目录中创建名为 freemarker .ftl 文件，内容如下：<!DOCTYPE html> <html lang="zh"> <head> <meta charset="UTF-8"> <title>Document</title> <link href="/css/index.css" rel="stylesheet"/> </head> <body> <div class="container"> <h2>${map}</h2> </div> </body> </html>结果如下：整合Thymeleaf 模板添加 Thymeleaf依赖<!--thymeleaf--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency>添加 Thymeleaf模板配置在 application.properties 中添加如下内容：#thymeleaf模板 spring.thymeleaf.cache=true spring.thymeleaf.prefix=classpath:/templates/ spring.thymeleaf.suffix=.html spring.thymeleaf.mode=HTML5 spring.thymeleaf.encoding=UTF-8 spring.thymeleaf.servlet.content-type=text/html上述配置都是默认值。编写Controllerpackage club.lygangdai.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import java.util.Map; @Controller @RequestMapping("thymeleaf") public class ThymeleafController { @RequestMapping("thymeleaf") public String hello(Map<String,Object> map) { map.put("map", "Hello Thymeleaf"); return "thymeleaf"; } }在 templates 目录中创建名为 thymeleaf.html 文件，内容如下：<!DOCTYPE html> <html lang="en" xmlns:th="http://www.w3.org/1999/xhtml"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h2 th:text="${map}"></h2> </body> </html>结果如下：
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Spring Boot 整合之Mybatis 1.引入Mybatis、MySQL依赖注意：这里不引入spring-boot-starter-jdbc依赖，是由于mybatis-spring-boot-starter中已经包含了此依赖。 <!-- springboot,mybatis 整合包 --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <!--mysql--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency>MyBatis-Spring-Boot-Starter依赖将会提供如下： 自动检测现有的DataSource。 将创建并注册SqlSessionFactory的实例，该实例使用SqlSessionFactoryBean将该DataSource作为输入进行传递。 将创建并注册从SqlSessionFactory中获取的SqlSessionTemplate的实例。 自动扫描您的mappers，将它们链接到SqlSessionTemplate并将其注册到Spring上下文，以便将它们注入到您的bean中。 就是说，使用了该Starter之后，只需要定义一个DataSource即可（application.properties中可配置），它会自动创建使用该DataSource的SqlSessionFactoryBean以及SqlSessionTemplate。会自动扫描你的Mappers，连接到SqlSessionTemplate，并注册到Spring上下文中。2.配置数据库连接：在 application.properties 中添加：#数据连接 spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC spring.datasource.username=root spring.datasource.password=root123 # mybatis 配置 mybatis.config-location=classpath:mybatis/mybatis-config.xml mybatis.mapper-locations=classpath:mybatis/mapper/*.xml3.在 src/main/resources 下创建 mybatis 文件夹，并在 mybatis 文件夹中创建 "mybatis-config.xml" 配置文件，内容如下：<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <!-- 获取数据库自增主键值 --> <setting name="useGeneratedKeys" value="true"/> <!-- 使用列别名替换列名，默认为 true --> <setting name="useColumnLabel" value="true"/> <!-- 开启驼峰命名转换：Table(create_time) => Entity(createTime) --> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> </configuration>mybatis 文件夹下再创建一个 "mapper" 文件夹，里边存放 Mpper 接口对应的 mapper 映射文件。4.测试4.1建表CREATE TABLE t_user( u_id INT PRIMARY KEY auto_increment COMMENT "ID", u_name VARCHAR(20) NOT NULL COMMENT "用户姓名" )COMMENT="用户"4.2实体类package club.lygangdai.pojo; public class User { private Integer uId; private String uName; }此处省略setter和getter4.3Mapper接口package club.lygangdai.dao; import club.lygangdai.pojo.User; import org.apache.ibatis.annotations.Mapper; @Mapper public interface UserDao { int insertUser(User user); User getUserById(Integer uid); int updateUser(User user); int deleteUserById(Integer uid); }Mapper 接口需要添加 @Mapper 注解，如果不想使用该注解，可以在启动类上使用 @MapperScan 配置 Mapper 接口路径@SpringBootApplication @MapperScan("club.lygangdai.dao") public class SpringbootMybatisJspApplication { public static void main(String[] args) { SpringApplication.run(SpringbootMybatisJspApplication.class, args); } } mybatis/mapper/UserMapper.xml ：<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="club.lygangdai.dao.UserDao"> <insert id="insertUser" parameterType="club.lygangdai.pojo.User"> insert into t_user(u_name) values(#{uName}) </insert> <select id="getUserById" parameterType="java.lang.Integer" resultType="club.lygangdai.pojo.User"> select u_id,u_name from t_user where u_id = #{uId} </select> <update id="updateUser" parameterType="club.lygangdai.pojo.User"> update t_user set u_name = #{uName} where u_id = #{uId} </update> <delete id="deleteById" parameterType="java.lang.Integer"> delete from t_user where u_id = #{uId} </delete> </mapper>4.4测试4.4.1创建controller@Controller @RequestMapping("user") public class UserController { @Resource private UserDao userDao; @RequestMapping(value = "getUser",produces="text/html;charset=UTF-8") @ResponseBody public User getUser(){ User user = userDao.getUserById(1); return user; } } 注：返回的是json格式，我之前已做配置转json请看https://blog.csdn.net/qq_40369944/article/details/83898752数据库添加一条默认数据查询结果：
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Spring Boot 整合之Fastjson 1.导入依赖<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.51</version> </dependency> 2.创建管理类WebConfig@Configuration public class WebConfig { @Bean public HttpMessageConverters fastJsonHttpMessageConverters() { FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter(); FastJsonConfig fastJsonConfig = new FastJsonConfig(); fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat); fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig); HttpMessageConverter<?> converter = fastJsonHttpMessageConverter; return new HttpMessageConverters(converter); } }3.创建测试实体类public class Test_Table { private Integer id; private String username; private Date birthday; }getter 和 setter 此处省略。4.创建Controller@Controller @RequestMapping("fastjson") public class FastJsonController{ @RequestMapping("/test") @ResponseBody public Test_Table test() { Test_Table test_table = new Test_Table(); test_table.setId(1); test_table.setUsername("汤姆"); test_table.setBirthday(new Date()); return test_table; } }结果如下：乱码，在@RequestMapping添加 @RequestMapping(value = "/test",produces="text/html;charset=UTF-8") 日期是毫秒数，我们在 User 类中使用 Fastjson 的注解，如下内容： @JSONField(format="yyyy-MM-dd HH:mm:ss") private Date birthday;再次测试，结果如下： 当日期格式与我们修改的内容格式一致，说明 Fastjson 整合成功。
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Spring Boot 整合之Redis 在添加 redis 依赖包启动项目后，Spring Boot 会自动配置 RedisCacheManger 和 RedisTemplate 的 Bean。如果开发者不想使用 Spring Boot 写好的 Redis 缓存，而是想使用其 API 自己实现缓存功能、消息队列或分布式锁之类的需求时，可以继续往下浏览。Spring Data Redis 为我们提供 RedisTemplate 和 StringRedisTemplate 两个模板进行数据操作，它们主要 的访问方法如下：方法说明opsForValue()操作简单属性的数据opsForList()操作含有 list 的数据opsForSet()操作含有 set 的数据opsForZSet()操作含有 zset 的数据opsForHash()操作含有 hash 的数据1.导入依赖 <!--redis--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency>2.配置连接属性# redis 配置 spring.redis.host=47.106.8.233 spring.redis.port=6379 spring.redis.password=redis123 # 缓存过期时间，单位毫秒 spring.cache.redis.time-to-live=60000s3.创建RedisDao@Component public class RedisDao { @Autowired private StringRedisTemplate stringRedisTemplate; public void set(String key, String value) { this.stringRedisTemplate.opsForValue().set(key, value); } public String get(String key) { return this.stringRedisTemplate.opsForValue().get(key); } public void delete(String key) { this.stringRedisTemplate.delete(key); } }4.测试@RunWith(SpringRunner.class) @SpringBootTest public class RedisDaoTest { @Autowired private RedisDao redisDao; @Test public void testSet() { String key = "name"; String value = "zhangsan"; this.redisDao.set(key, value); } @Test public void testGet() { String key = "name"; String value = this.redisDao.get(key); System.out.println(value); } @Test public void testDelete() { String key = "name"; this.redisDao.delete(key); } }
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Spring Boot 整合之定时任务 前言@Scheduled适用与监听任务较少的，而Quartz适合较多的，为确保可伸缩性，Quartz采用了基于多线程的架构。启动时，框架初始化一套worker线程，这套线程被调度器用来执行预定的作业。这就是Quartz怎样能并发运行多个作业的原理。Quartz依赖一套松耦合的线程池管理部件来管理线程环境。 实现定时器的方式有两种： Scheduled：spring 3.0 后自带的定时器 Quartz：第三放定时器框架 1.Scheduled1.1创建任务类import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Component; import org.springframework.scheduling.annotation.Async; import java.util.Date; @Component public class Schedule { @Async @Scheduled(fixedRate = 2000) public void task() { System.out.println("启动定时任务:" + new Date()); } }使用 @Scheduled 定义任务执行时间，代码中表示每隔 2 秒执行一次任务。1.2启动定时任务在启动类上添加@EnableScheduling测试结果：2.Quartz2.1导入依赖 <dependency> <groupId>org.quartz-scheduler</groupId> <artifactId>quartz</artifactId> <version>2.2.1</version> </dependency> <dependency> <groupId>org.quartz-scheduler</groupId> <artifactId>quartz-jobs</artifactId> <version>2.2.1</version> </dependency>2.2创建定时任务类import org.quartz.Job; import org.quartz.JobExecutionContext; import org.quartz.JobExecutionException; import java.util.Date; public class MyJob implements Job { @Override public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException { System.out.println("========quartz 测试=========="+new Date()); } }2.3创建配置类import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.quartz.CronTriggerFactoryBean; import org.springframework.scheduling.quartz.JobDetailFactoryBean; import org.springframework.scheduling.quartz.SchedulerFactoryBean; import org.springframework.scheduling.quartz.SimpleTriggerFactoryBean; @Configuration public class QuartzConfiguration { /** * Job 工厂 * @return */ @Bean public JobDetailFactoryBean jobDetailFactoryBean() { JobDetailFactoryBean factory = new JobDetailFactoryBean(); factory.setJobClass(MyJob.class); return factory; } /** * Trigger 工厂 * @return */ @Bean public SimpleTriggerFactoryBean simpleTriggerFactoryBean(JobDetailFactoryBean jobDetailFactory) { SimpleTriggerFactoryBean factory = new SimpleTriggerFactoryBean(); factory.setJobDetail(jobDetailFactory.getObject()); // 执行间隔时间 factory.setRepeatInterval(5000); // 重复执行次数 factory.setRepeatCount(3); return factory; } /** * Trigger 工厂 * @return */ @Bean public CronTriggerFactoryBean cronTriggerFactoryBean(JobDetailFactoryBean jobDetailFactory) { CronTriggerFactoryBean factory = new CronTriggerFactoryBean(); factory.setJobDetail(jobDetailFactory.getObject()); factory.setCronExpression("0/5 * * * * ?"); return factory; } @Bean public SchedulerFactoryBean schedulerFactoryBean(CronTriggerFactoryBean cronTriggerFactory){ SchedulerFactoryBean factory = new SchedulerFactoryBean(); factory.setTriggers(cronTriggerFactory.getObject()); return factory; } }同样地，需要在 Spring Boot 的启动类上添加 @EnableScheduling 后，启动项目即可。测试结果：2.4依赖注入问题实际开发中，任务类需要注入业务组件来执行定时任务，如下：public class MyJob implements Job { @Autowired private UserDao userDao; @Override public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException { //添加 User user1 = new User(); user1.setuName("李四"); int i = userDao.insertUser(user1); System.out.println(i); //查询 User user = userDao.getUserById(1); System.out.println(user); } }但是MyJob 生命周期并没有被 Spring 容器管理，因此无法注入 UserService，当定时器执行任务时会报空指针异常。解决方案：自定义任务工厂，重写创建任务实例的方法：import org.quartz.spi.TriggerFiredBundle; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.config.AutowireCapableBeanFactory; import org.springframework.scheduling.quartz.AdaptableJobFactory; import org.springframework.stereotype.Component; @Component("customAdaptableJobFactory") public class CustomAdaptableJobFactory extends AdaptableJobFactory { @Autowired private AutowireCapableBeanFactory autowireCapableBeanFactory; @Override protected Object createJobInstance(TriggerFiredBundle bundle) throws Exception { Object object = super.createJobInstance(bundle); // 将任务实例纳入 Spring 容器中 this.autowireCapableBeanFactory.autowireBean(object); return object; } }修改QuartzConfiguration类 的 Scheduler 实现：原：@Bean public SchedulerFactoryBean schedulerFactoryBean(CronTriggerFactoryBean cronTriggerFactory){ SchedulerFactoryBean factory = new SchedulerFactoryBean(); factory.setTriggers(cronTriggerFactory.getObject()); return factory; }改：@Bean public SchedulerFactoryBean schedulerFactoryBean(CronTriggerFactoryBean cronTriggerFactory,CustomAdaptableJobFactory customAdaptableJobFactory){ SchedulerFactoryBean factory = new SchedulerFactoryBean(); factory.setTriggers(cronTriggerFactory.getObject()); factory.setJobFactory(customAdaptableJobFactory); return factory; }测试结果：
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Spring Boot 整合之文件上传与下载（本地及网络url下载） 1.导入依赖 <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.6</version> </dependency>2.编写封装类 返回信息public class FileInfo { private String path; public FileInfo(String path) { this.path = path; } public String getPath() { return path; } public void setPath(String path) { this.path = path; } }3.编写controller 实现文件上传与下载3.1创建@RestController @RequestMapping("/file") public class FileController { /** * 上传图片 * @param file * @param req * @return * @throws Exception */ @PostMapping public FileInfo upload(MultipartFile file,HttpServletRequest req) throws Exception { System.out.println(file.getName()); System.out.println(file.getOriginalFilename());//原图片名 System.out.println(file.getSize());//大小 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss"); //图片名 String fileName = URLEncoder.encode(file.getOriginalFilename(), "UTF-8"); fileName=sdf.format(new Date())+fileName.substring(fileName.lastIndexOf('.')); //路径 String path=req.getSession().getServletContext().getRealPath("/")+ "upload\\"; File localFile = new File(path, fileName); file.transferTo(localFile); //返回json格式 return new FileInfo(localFile.getAbsolutePath()); } /** * 下载图片 * @param id * @param request * @param response */ @GetMapping("/{id}")//id为要下载的图片名：123.jsp public void download(@PathVariable String id, HttpServletRequest request, HttpServletResponse response) { String path=request.getSession().getServletContext().getRealPath("/")+ "upload\\"; //根据url获取输入流 //URL url = new URL(zipUrl); //HttpURLConnection conn = (HttpURLConnection)url.openConnection(); //设置超时间为3秒 //conn.setConnectTimeout(3*1000); //防止屏蔽程序抓取而返回403错误 //conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)"); //得到输入流 //InputStream inputStream = conn.getInputStream(); //------------------------------------------- //下载 try (InputStream inputStream = new FileInputStream(new File(path, id )); OutputStream outputStream = response.getOutputStream();) { response.setContentType("application/x-download"); response.addHeader("Content-Disposition", "attachment;filename=" + id); IOUtils.copy(inputStream, outputStream); } catch (Exception e) { e.printStackTrace(); } } }如果路径异常，用以下方法获取路径： /** * 获取图片上传路径 * @return * @throws Exception */ public static String getPath() throws Exception { //路径 File path = new File(ResourceUtils.getURL("classpath:").getPath()); if (!path.exists()) { path = new File(""); } //如果上传目录为/static/images/upload/,则可以如下获取 File upload = new File(path.getAbsolutePath(), "static/upload/"); if (!upload.exists()) { upload.mkdirs(); // System.out.println(upload.getAbsolutePath()); //在开发测试模式时，得到地址为：{项目跟目录}/target/static/images/upload/ //在打成jar正式发布时，得到的地址为:{发布jar包目录}/static/images/upload/ } return upload.getAbsolutePath(); }3.2@RestController和@Controller区别@RestController注解相当于@ResponseBody ＋ @Controller合在一起的作用。1) 如果只是使用@RestController注解Controller，则Controller中的方法无法返回jsp页面，或者html，配置的视图解析器 InternalResourceViewResolver不起作用，返回的内容就是Return 里的内容。转json请看https://blog.csdn.net/qq_40369944/article/details/838987522) 如果需要返回到指定页面，则需要用 @Controller配合视图解析器InternalResourceViewResolver才行。 如果需要返回JSON，XML或自定义mediaType内容到页面，则需要在对应的方法上加上@ResponseBody注解。4.测试4.1上传4.1.1html：<form action="/file" method="post" enctype="multipart/form-data" > <input type="file" name="file"> <input type="submit" value="ok"> </form>4.1.2页面：4.1.3结果：4.2下载我就直接根据项目中的图片名下载get方式 地址：浏览器下载：
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Spring Boot 整合之JavaMail 1.添加依赖<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-mail</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-freemarker</artifactId> </dependency>本次邮箱测试使用了freemarker模板2.添加配置在 application.properties 中添加spring.mail.host=smtp.qq.com spring.mail.username=********@qq.com #邮箱授权码 spring.mail.password=授权码 spring.mail.properties.mail.smtp.auth=true spring.mail.properties.mail.smtp.starttls.enable=true spring.mail.properties.mail.smtp.starttls.required=true3.创建JavaMailComponentimport org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.autoconfigure.mail.MailProperties; import org.springframework.boot.context.properties.EnableConfigurationProperties; import org.springframework.mail.javamail.JavaMailSender; import org.springframework.mail.javamail.MimeMessageHelper; import org.springframework.stereotype.Component; import org.springframework.ui.freemarker.FreeMarkerTemplateUtils; import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer; import javax.mail.MessagingException; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import java.io.UnsupportedEncodingException; import java.util.HashMap; import java.util.Map; @Component @EnableConfigurationProperties(MailProperties.class) public class JavaMailComponent { private static final String template = "mail.ftl"; @Autowired private FreeMarkerConfigurer freeMarkerConfigurer; @Autowired private JavaMailSender javaMailSender; @Autowired private MailProperties mailProperties; public void sendMail(String email) { Map<String, Object> map = new HashMap<String, Object>(); map.put("email", email); try { // 获取内容 String text = this.getTextByTemplate(template, map); // 发送 this.send(email, text); } catch (Exception e) { e.printStackTrace(); } } private String getTextByTemplate(String template, Map<String, Object> model) throws Exception { return FreeMarkerTemplateUtils .processTemplateIntoString(this.freeMarkerConfigurer.getConfiguration().getTemplate(template), model); } private String send(String email, String text) throws MessagingException, UnsupportedEncodingException { MimeMessage message = this.javaMailSender.createMimeMessage(); MimeMessageHelper helper = new MimeMessageHelper(message, true, "UTF-8"); InternetAddress from = new InternetAddress(); from.setAddress(this.mailProperties.getUsername()); from.setPersonal("Java记", "UTF-8"); helper.setFrom(from); helper.setTo(email); helper.setSubject("SpringBoot 发送的第一封邮件"); helper.setText(text, true); this.javaMailSender.send(message); return text; } }4.创建邮箱模板在 src/main/resources 下的 template 目录下创建名为 mail.ftl 的文件，其内容如下：<!DOCTYPE html> <html lang="zh"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> </head> <body> <div style="width: 600px; text-align: left; margin: 0 auto;"> <h1 style="color: #005da7;">Java记</h1> <div style="border-bottom: 5px solid #005da7; height: 2px; width: 100%;"></div> <div style="border: 1px solid #005da7; font-size: 16px; line-height: 50px; padding: 20px;"> <div>${email}，您好！</div> <div> 这是个测试 </div> <div> 想了解更多信息，请访问 <a href="https://www.javaj.work">https://www.javaj.work</a> </div> </div> </div> </body> </html>5.测试 @RunWith(SpringRunner.class) @SpringBootTest public class MailTest { @Autowired private JavaMailComponent javaMailComponent; @Test public void test() { this.javaMailComponent.sendMail("********@qq.com"); } }运行结果如下：
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Spring Boot 整合之druid 1.导入依赖 <!-- springboot,mybatis 整合包 --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <!-- springboot,druid 整合包 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.10</version> </dependency> <!--web--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!--tomcat--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <!--test--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--mysql--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency>2.配置application.properties#数据连接 spring.datasource.druid.driverClassName=com.mysql.jdbc.Driver spring.datasource.druid.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC spring.datasource.druid.username=root spring.datasource.druid.password=root123 spring.datasource.druid.initialSize=5 spring.datasource.druid.minIdle=5 spring.datasource.druid.maxActive=20 spring.datasource.druid.maxWait=60000 spring.datasource.druid.timeBetweenEvictionRunsMillis=60000 spring.datasource.druid.min-evictableIdleTimeMillis=300000 spring.datasource.druid.validationQuery=SELECT 1 FROM DUAL spring.datasource.druid.testWhileIdle=true spring.datasource.druid.testOnBorrow=false spring.datasource.druid.testOnReturn=false spring.datasource.druid.poolPreparedStatements=true spring.datasource.druid.maxPoolPreparedStatementPerConnectionSize=20 spring.datasource.druid.filters=stat,wall # mybatis 配置 mybatis.config-location=classpath:mybatis/mybatis-config.xml mybatis.mapper-locations=classpath:mybatis/mapper/*.xml3.编程@Configuration public class DruidConfiguration { //引用application.yml中的配置 @ConfigurationProperties(prefix = "spring.datasource.druid") @Bean public DataSource druid(){ return new DruidDataSource(); } /** * 配置Druid的监控 * 1、配置一个管理后台的Servlet * @return */ @Bean public ServletRegistrationBean statViewServlet(){ ServletRegistrationBean bean=new ServletRegistrationBean(new StatViewServlet(),"/druid/*"); Map<String,String> initParams=new HashMap<>(); //白名单： initParams.put("allow","");//默认就是允许所有访问 //IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page. initParams.put("deny","192.20.10.5"); //Druid监控后台登录账号密码 initParams.put("loginUsername","admin"); initParams.put("loginPassword","123456"); bean.setInitParameters(initParams); return bean; } /** * 2、配置一个web监控的filter * @return */ @Bean public FilterRegistrationBean webStatFilter() { FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter()); //添加过滤规则. filterRegistrationBean.addUrlPatterns("/*"); //添加不需要忽略的格式信息. filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid2/*"); return filterRegistrationBean; } }4.创建实体类public class User { private Integer uId; private String uName; }此处省略setter和getter5.创建接口public interface UserDao { int insertUser(User user); User getUserById(Integer uid); int updateUser(User user); int deleteUserById(Integer uid); }6.添加配置文件6.1 创建mybatis-config.xml (resources\mybatis 文件夹自己创)<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <!-- 获取数据库自增主键值 --> <setting name="useGeneratedKeys" value="true"/> <!-- 使用列别名替换列名，默认为 true --> <setting name="useColumnLabel" value="true"/> <!-- 开启驼峰命名转换：Table(create_time) => Entity(createTime) --> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> </configuration> 6.2 创建UserMapper.xml (resources\mybatis\mapper 文件夹自己创)<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="club.lygangdai.dao.UserDao"> <insert id="insertUser" parameterType="club.lygangdai.pojo.User"> insert into t_user(u_name) values(#{uName}) </insert> <select id="getUserById" parameterType="java.lang.Integer" resultType="club.lygangdai.pojo.User"> select u_id,u_name from t_user where u_id = #{uId} </select> <update id="updateUser" parameterType="club.lygangdai.pojo.User"> update t_user set u_name = #{uName} where u_id = #{uId} </update> <delete id="deleteById" parameterType="java.lang.Integer"> delete from t_user where u_id = #{uId} </delete> </mapper> 注意：在启动类添加注解 @MapperScan(dao包路径)7.测试 @RunWith(SpringRunner.class) @SpringBootTest public class SpringbootDruidApplicationTests { @Autowired private UserDao userDao; @Test public void contextLoads() { User user = userDao.getUserById(1); System.out.println(user); } }结果图如下：在浏览器输入：http://127.0.0.1:8080/druid/login.html进监听登录根据配置的账户密码登录
