SpringBoot

约定优于配置。无web.xml，默认采用是以jar包形式启动嵌入式的servlet容器，从而启动Spring Boot 的应用。

创建项目
https://start.spring.io/

创建页面

导入项目import existing maven project

结构

端口号被占用可以在application.properties中设置
server.port=7777

默认不适用jsp
但可以在pom中导入jasper文件,version继承父类

            org.apache.tomcat.embed
            tomcat-embed-jasper            


            javax.servlet
            jstl

热启动

            org.springframework.boot
            spring-boot-devtools

日期转换器

@Component
public class CustomDateConverter implements Converter{

    @Override
    public Date convert(String arg0) {
        
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        
        try {
            return sdf.parse(arg0);
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }
}

测试

@RestController
@RequestMapping("/param")
    public class ParamController {
        @RequestMapping("/test")
        public String test(Student s) {
            
            System.out.println(s.getStuid());
            System.out.println(s.getStuname());
            System.out.println(s.getBirthday());
            
            return "{\"result\":true}";
            
        }
    }   

配置视图解析器application.properties

#配置视图解析器的前缀和后缀
spring.mvc.view.prefix=/WEB-INF/
spring.mvc.view.suffix=.jsp

配置静态资源

#配置静态资源
spring.resources.static-locations=classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources,file:d:/images

#修改文件上传大小限制 ( 默认1M)
#单个文件大小限制
spring.servlet.multipart.max-file-size=10MB
#多个文件总大小限制（file控制支持多选的时候）
spring.servlet.multipart.max-request-size=20MB

上传文件

@RestController
public class UploadController {
    //spring boot 文件上传，如果没有引入commons-fileupload，就按照servlet3.0的方式上传
    @RequestMapping("/upload")
    public String upload(MultipartFile avatarfile) {
        //1.新的文件名
        String filename=UUID.randomUUID().toString()+avatarfile.getOriginalFilename();
        //2.拷贝到d:/images
        File dest=new File("d:/images",filename);
        try {
            avatarfile.transferTo(dest);
            return "{\"file\":"+filename+"}";
        } catch (IllegalStateException |IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //3.保存数据库
        //4.返回文件路径
        return null;
        
    }
    
    @RequestMapping("/upload1")
    public String upload1(MultipartFile[] avatarfile) {
        for(MultipartFile item:avatarfile) {
        //1.新的文件名
        String filename=UUID.randomUUID().toString()+item.getOriginalFilename();
        //2.拷贝到d:/images
        File dest=new File("d:/images",filename);
        try {
            item.transferTo(dest);
            
        } catch (IllegalStateException |IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //3.保存数据库
        //4.返回文件路径  
        }
        return "{\"result\":true}";
    }

html文件

    
  
        
        
        提交    
    

文件下载

@Controller
public class DownloadController {
    @RequestMapping("/download")
    public void download(HttpServletResponse response) {
        //文件名中如果有中文，需要按utf-8编码
        String filename=null;
        try {
             filename=URLEncoder.encode("中文.zip","utf-8");
        } catch (UnsupportedEncodingException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } 
        //设置响应头
            //设置响应的content-type(MIME类型):二进制(application/octet-stream)
            response.setHeader("Content-Type", "application/octet-stream");
            //设置Content-Disposition
            response.setHeader("Content-Disposition", "attachment;filename="+filename);
        try {
            // 得到输入流
            FileInputStream in = new FileInputStream("d:/images/28c2b481-46ed-470d-9155-f606cb31d17dNotePad_v7.6.1.zip");
            BufferedInputStream bin = new BufferedInputStream(in);

            // 得到输出流
            OutputStream out = response.getOutputStream();
            BufferedOutputStream bout = new BufferedOutputStream(out);

            byte[] b = new byte[1024];

            int len = bin.read(b);

            while (len !=-1) {
                bout.write(b, 0, len);
                len = bin.read(b);
                bout.flush();
            }
            bout.close();
            bin.close();

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}