SpringBoot的Web开发支持
使用spring-boot-starter-web启动器,开始web支持,内嵌一个Tomcat,添加了对于SpringMVC的支持。Spring Boot默认servlet容器为tomcat。
Spring Boot supports the following embedded servlet containers:
Name | Servlet | Version |
---|---|---|
Tomcat | 9.0 | 4.0 |
Jetty | 9.4 | 3.1 |
Undertow | 2.0 | 4.0 |
常用的服务器配置
- 配置端口号Spring Boot 默认端口是8080,如果想要进行更改的话,在配置文件中加入:server.port=8081
- 配置session的超时时间server.servlet.session.timeout=2M
使用Jetty服务器替换Tomcat
项目目录:
排除Tomcat的启动器,引入Jetty
pom.xml:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
</dependencies>
application.yml
application.yml:
server:
port: 80
编写入口程序
入口程序:
package com.keafmd;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* Keafmd
*
* @ClassName: App03
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-06 13:57
* @Blog: https://keafmd.blog.csdn.net/
*/
@SpringBootApplication
public class App03 {
public static void main(String[] args) {
SpringApplication.run(App03.class,args);
}
}
编写Controller测试
Controller测试:
package com.keafmd.controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* Keafmd
*
* @ClassName: JettyController
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-06 13:56
* @Blog: https://keafmd.blog.csdn.net/
*/
@RestController
public class JettyController {
/**
* http://127.0.0.1:80/hello
* @return
*/
@GetMapping("/hello")
public String hello(){
return "hello keafmd";
}
}
测试结果
运行启动类,效果如下:
访问:http://127.0.0.1:80/hello
Jetty对jsp的支持
添加依赖
springboot中的jetty为内嵌的jetty,支持jsp需要添加额外的依赖。
在pom.xml中添加如下依赖:
<!--jetty容器支持jsp start-->
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-server</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>apache-jsp</artifactId>
</dependency>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>apache-jstl</artifactId>
</dependency>
<!--jetty容器支持jsp end-->
SpringBoot集成使用jsp
编写一个jsp
注意是在webapp的目录下。
index.jsp:
<%--
Created by IntelliJ IDEA.
User: lenovo
Date: 2021/4/6
Time: 14:41
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>Keafmd</h1>
</body>
</html>
编写Controller
JspController:
package com.keafmd.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
/**
* Keafmd
*
* @ClassName: JspController
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-06 14:43
* @Blog: https://keafmd.blog.csdn.net/
*/
@Controller
public class JspController {
/**
* http://127.0.0.1/keafmd
* @return
*/
@GetMapping("/keafmd")
public String keafmd(){
return "/index.jsp";
}
}
测试结果
我提前配置好了80端口。
访问:http://127.0.0.1/keafmd
配置上下文
application.yml:
server:
port: 80
spring:
mvc:
view:
prefix: /WEB-INF/user/
suffix: .jsp
编写user_list.jsp
user_list.jsp:
<%--
Created by IntelliJ IDEA.
User: lenovo
Date: 2021/4/6
Time: 14:45
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>User_List</h1>
</body>
</html>
编写Controller
JspController:
package com.keafmd.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
/**
* Keafmd
*
* @ClassName: JspController
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-06 14:43
* @Blog: https://keafmd.blog.csdn.net/
*/
@Controller
public class JspController {
/**
* http://127.0.0.1/keafmd
* @return
*/
@GetMapping("/keafmd")
public String keafmd(){
return "/index.jsp";
}
@GetMapping("/userlist")
public String userlist(){
return "user_list";
}
}
测试结果
访问:http://127.0.0.1/userlist
打包(jar和war)
区别:打jar包不能访问jsp资源,war包可以。
引入所需的插件
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build>
打包
打开war包所在文件位置
在此处打开cmd,输入启动的命令
java -jar xxxxx.war/.jar
访问jsp页面
打jar包的话是访问不到user_list.jsp的,这里就不测试了。
对静态资源的配置
把类路径下的 /static、/public、/resources 和 /META-INF/resources 文件夹下的静态文件直接映射为 /,可以直接通过 http://localhost:8080/ 访问。
在resources下创建static目录,在创建common目录,然后创建tt.css。
访问:http://127.0.0.1:8080/common/tt.css
自定义资源映射
static-locations
默认支持的文件路径:classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources
mm.css:
body{
padding: 0;
}
tt.css:
body{
margin: 0;
padding: 0;
}
在我们没有在application.yml配置文件配置前,访问:http://localhost:8080/mm.css,结果如下↓
因为mm.css在自定义的mystatic文件夹下,不被静态资源识别,需要自定义。
但是可以直接访问:http://localhost:8080/common/tt.css,因为tt.css在static文件夹下。
当我们在application.yml配置文件夹下添加上自定义的文件夹后就可以访问了。
application.yml:
spring:
mvc:
static-path-pattern: /**
web:
resources:
static-locations: classpath:/mystatic,classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources
访问:http://localhost:8080/mm.css,结果如下↓,配置后可以直接访问。
static-path-pattern
当我们修改application.xml文件后:
spring:
mvc:
static-path-pattern: /css/**
web:
resources:
static-locations: classpath:/mystatic,classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources
像上面那样访问都是失败的了
我们需要加上/css
才可以
配置自定义的Convert解决日期类型的参数转换
Convert、Formatter:用于接收浏览器请求的参数自动转化成响应类型的数据Stirng(1988-01-01)-Date(1988-01-01)
User:
package com.keafmd.entity;
import lombok.Data;
import java.util.Date;
/**
* Keafmd
*
* @ClassName: User
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 9:53
* @Blog: https://keafmd.blog.csdn.net/
*/
@Data
public class User {
private String id;
private Integer age;
private String address;
private Date createTime;
}
ConverterController:
package com.keafmd.controller;
import com.keafmd.entity.User;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* Keafmd
*
* @ClassName: ConverterController
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 9:54
* @Blog: https://keafmd.blog.csdn.net/
*/
@RestController
public class ConverterController {
/**
* http://127.0.0.1:8080/user?createTime=2021-04-07 01:02:03
* @param user
* @return
*/
@GetMapping("/user")
User getUserInfo(User user){
return user;
}
}
DateConverter:
package com.keafmd.config;
import org.springframework.core.convert.converter.Converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* Keafmd
*
* @ClassName: DateConverter
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 9:58
* @Blog: https://keafmd.blog.csdn.net/
*/
public class DateConverter implements Converter<String, Date> {
/**
* yyyy-MM-dd
*
* @param source
* @return
*/
@Override
public Date convert(String source) {
try {
return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(source);
} catch (ParseException e) {
e.printStackTrace();
}
return null;
}
}
BootWebMvcConfig:
package com.keafmd.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
/**
* Keafmd
*
* @ClassName: BootWebMvcConfig
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 10:27
* @Blog: https://keafmd.blog.csdn.net/
*/
@Configuration(proxyBeanMethods = false)
public class BootWebMvcConfig implements WebMvcConfigurer {
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addConverter(new DateConverter());
}
}
还需要在application.yml配置一下时区和格式。
application.yml:
spring:
jackson:
time-zone: GMT+8
date-format: yyyy-MM-dd HH:mm:ss
启动springboot,访问:http://127.0.0.1:8080/user?createTime=2021-04-07 01:02:03
自定义拦截器的配置
实现基础springmvc的拦截器
自定义类实现HandlerInterceptor接口
MyInterceptor:
package com.keafmd.config;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Keafmd
*
* @ClassName: MyInterceptor
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 11:41
* @Blog: https://keafmd.blog.csdn.net/
*/
public class MyInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("MyInterceptor.preHandle");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("MyInterceptor.postHandle");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("MyInterceptor.afterCompletion");
}
}
使用Java的形式配置拦截器的拦截路径
在WebMvcConfig中注册拦截器,实现WebMvcConfigrer接口,并声明Bean。
BootWebMvcConfig:
package com.keafmd.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.List;
/**
* Keafmd
*
* @ClassName: BootWebMvcConfig
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 10:27
* @Blog: https://keafmd.blog.csdn.net/
*/
@Configuration(proxyBeanMethods = false)
public class BootWebMvcConfig implements WebMvcConfigurer {
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addConverter(new DateConverter());
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
//注册拦截
registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
}
@Override
public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
}
}
自定义页面跳转
BootWebMvcConfig:
package com.keafmd.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.List;
/**
* Keafmd
*
* @ClassName: BootWebMvcConfig
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 10:27
* @Blog: https://keafmd.blog.csdn.net/
*/
@Configuration(proxyBeanMethods = false)
public class BootWebMvcConfig implements WebMvcConfigurer {
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addConverter(new DateConverter());
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
//注册拦截
registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
}
/**
* 映射自定义的跳转界面
* @param registry
*/
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/index").setViewName("index.html");
registry.addViewController("/home").setViewName("index.html");
}
}
自定义资源映射
1、自动配置(在全局额配置文件中修改)
spring.mvc.static-path-pattern=/
spring.resources.static-locations= classpath:/static,classpath:/public,classpath:/resources,classpath:/META-INF/resources
2、自定义资源路径
自定义资源映射,重写WebMvcConfiger实现类的 重写addResourceHandler 方法
调用:addResourceHandler 用于处理哪些路径是静态资源
调用:addResourceLocations用于指定静态资源的实际目录
此方法会覆盖配置文件和默认的静态资源配置
BootWebMvcConfig:
package com.keafmd.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.List;
/**
* Keafmd
*
* @ClassName: BootWebMvcConfig
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 10:27
* @Blog: https://keafmd.blog.csdn.net/
*/
@Configuration(proxyBeanMethods = false)
public class BootWebMvcConfig implements WebMvcConfigurer {
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addConverter(new DateConverter());
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
//注册拦截
registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
}
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
/**
* http://127.0.0.1:8080/images/holiday.png
*/
// registry.addResourceHandler()
// registry.addResourceHandler("/images/").addResourceLocations("classpath:/imgs/");
registry.addResourceHandler("/images/**").
addResourceLocations("classpath:/imgs/",
"classpath:/mystatic/" ,
"classpath:/static/" ,
"classpath:/public/" ,
"classpath:/META-INF/resources",
"classpath:/resources");
}
}
错误处理、异常处理
错误的类型:
-
因为后台程序出错导致的Exception(http 500)
-
因为参数传递错误(http 400)
-
客户端的原因造成的路径不对(http 404)
当有错误产生,默认跳转到/error,指向的是BasicErrorController。
定制错误响应:
1、有模板引擎的情况下;error/状态码; 【将错误页面命名为 错误状态码.html 放在模板引擎文件夹里面的error文件夹下】,发生此状态码的错误就会来到对应的页面
2、没有模板引擎(模板引擎找不到这个错误页面),静态资源文件夹下找
3、以上都没有错误页面,就是默认来到Spring Boot默认的错误提示页面
可以使用4xx和5xx作为错误页面的文件名来匹配这种类型的所有错误,精确优先(优先寻找精确的状态码.html)
页面能获取的信息:
timestamp:时间戳
status:状态码
error:错误提示
exception:异常对象
message:异常消息
errors:JSR303数据校验的错误都在这里
在WebMvcConfiger的实现类中重写addViewConroller方法。
使用Java异常处理器
1、在Controller层面定义异常处理,哪里有异常哪里处理,只在某一个Controller中生效
JspController:
package com.keafmd.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Keafmd
*
* @ClassName: JspController
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 14:09
* @Blog: https://keafmd.blog.csdn.net/
*/
@Controller
public class JspController {
/**
* http://127.0.0.1:8080/toview
* @return
*/
@GetMapping("/toview")
String toview(){
return "/hello.jsp";
}
@GetMapping("/business")
String business(){
int result = 0/0;
return "/index.jsp";
}
/* @ExceptionHandler(value = Exception.class )
@ResponseBody
String resolveException(HttpServletRequest request, HttpServletResponse response, Exception ex ){
System.out.println(ex.getMessage());
return "{status:'unup',msg:'出错了'}";
}*/
}
2、定义全局的异常处理方式,定义一个类使用@ControllerAdvice ,在类中定义@ExceptionHandler的注解方法。
MyControllerAdvice:
package com.keafmd.controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Keafmd
*
* @ClassName: MyControllerAdvice
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 14:07
* @Blog: https://keafmd.blog.csdn.net/
*/
@RestControllerAdvice
public class MyControllerAdvice {
@ExceptionHandler(value = Exception.class )
// @ResponseBody
String resolveException(HttpServletRequest request, HttpServletResponse response, Exception ex ){
System.out.println(ex.getMessage());
return "{status:'unup',msg:'全局的处理,Controller出错了'}";
}
}
效果:
文件上传与下载
项目目录
新建个项目:springboot-file
pom.xml
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.keafmd</groupId>
<artifactId>springboot-file</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.4</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
<!--devtools-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- 解析jsp类库 -->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
</dependencies>
</project>
启动类
启动类AppFile:
package com.keafmd;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* Keafmd
*
* @ClassName: AppFile
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 15:08
* @Blog: https://keafmd.blog.csdn.net/
*/
@SpringBootApplication
public class AppFile {
public static void main(String[] args) {
SpringApplication.run(AppFile.class,args);
}
}
controller
BootConstants:
package com.keafmd.controller;
/**
* Keafmd
*
* @ClassName: BootConstants
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 16:07
* @Blog: https://keafmd.blog.csdn.net/
*/
public interface BootConstants {
public static final String UPLOAD_DIR ="D:\\upload";
}
FileUploadController :
package com.keafmd.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.multipart.MultipartFile;
import java.io.File;
import java.io.IOException;
import java.util.UUID;
/**
* Keafmd
*
* @ClassName: FileUploadController
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 15:05
* @Blog: https://keafmd.blog.csdn.net/
*/
@Controller
public class FileUploadController {
@PostMapping("upload")
String upload(MultipartFile pic) throws IOException {
//1 将临时空间的文件,转储到 D:\\upload
String originalFileName = pic.getOriginalFilename();
//扩展名
String ext = originalFileName.substring(originalFileName.lastIndexOf("."));
//转储的新文件名
String newFileName = UUID.randomUUID().toString() + ext;
//转储到 D:\\upload 下的 uuid.png/uuid.jpg
pic.transferTo(new File(BootConstants.UPLOAD_DIR, newFileName));
//2 将数据存储到 db
/**
* 当前时间
* 上传的ip
* 操作的工号
* 上传的文件名
*
*/
//3 跳转到列表页
return "redirect:/list";
}
@GetMapping("list")
String list(Model model) throws IOException {
File[] list = new File(BootConstants.UPLOAD_DIR).listFiles();
model.addAttribute("fileList",list);
return "/list.jsp";
}
}
DownloadController :
package com.keafmd.controller;
import org.springframework.core.io.FileSystemResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
/**
* Keafmd
*
* @ClassName: DownloadController
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 16:10
* @Blog: https://keafmd.blog.csdn.net/
*/
@Controller
public class DownloadController {
/**
* 3000
*
* 1024 1024 (2048) 954
*
*
* @param path
* @param response
* @throws IOException
*/
@GetMapping("/d1/{path}")
public void download(@PathVariable String path , HttpServletResponse response) throws IOException {
response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
response.addHeader(HttpHeaders.CONTENT_DISPOSITION,"attachment;filename="+path);
InputStream is = new FileInputStream(new File(BootConstants.UPLOAD_DIR,path));
OutputStream os = response.getOutputStream();
int len = -1;
byte[] bytes = new byte[1024];
while ( (len = is.read(bytes)) != -1){
os.write(bytes,0,len);
}
os.close();
is.close();
}
@GetMapping("/d2/{path}")
public ResponseEntity download2(@PathVariable String path ) throws IOException {
return ResponseEntity.ok().
header(HttpHeaders.CONTENT_TYPE,"application/octet-stream").
header(HttpHeaders.CONTENT_DISPOSITION,"attachment;filename="+path).
body(new FileSystemResource(new File(BootConstants.UPLOAD_DIR,path)));
}
}
AppConfig :
package com.keafmd.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
/**
* Keafmd
*
* @ClassName: AppConfig
* @Description:
* @author: 牛哄哄的柯南
* @Date: 2021-04-07 16:05
* @Blog: https://keafmd.blog.csdn.net/
*/
@Configuration
public class AppConfig implements WebMvcConfigurer {
/**
* http://127.0.0.1/form
* @param registry
*/
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/form").setViewName("/upload.jsp");
}
/**
* http://127.0.0.1/down/ae37a66f-aec3-4e23-b2ed-7267adcfb2bb.png
* @param registry
*/
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/down/**").addResourceLocations("file:D:\\upload\\");
}
}
application.yml
server:
port: 80
SpringBoot集成使用jsp(超详细)
jsp
list.jsp:
<%--
Created by IntelliJ IDEA.
User: lenovo
Date: 2021/4/7
Time: 15:07
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<table border="1" cellspacing="0" cellpadding="0" width="100%">
<tr>
<th>序号</th>
<th>文件名称</th>
<th>操作</th>
</tr>
<c:forEach items="${fileList}" var="file" varStatus="stat">
<tr>
<td>${stat.count}</td>
<td>${file.getName()}</td>
<td>
<a href="${pageContext.request.contextPath}/down/04971284-d789-470a-a991-4d690c36b4ac.jpg">下载1</a>
<a href="${pageContext.request.contextPath}/d1/04971284-d789-470a-a991-4d690c36b4ac.jpg">下载2</a>
<a href="${pageContext.request.contextPath}/d2/04971284-d789-470a-a991-4d690c36b4ac.jpg">下载3</a>
</td>
</tr>
</c:forEach>
</table>
</body>
</html>
upload.jsp:
<%--
Created by IntelliJ IDEA.
User: lenovo
Date: 2021/4/7
Time: 16:10
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form method="post" action="${pageContext.request.contextPath}/upload" enctype="multipart/form-data">
<input type="file" name="pic">
<input type="submit" value="上传头像" >
</form>
</body>
</html>
效果
上传:
下载:
以上就是SpringBoot的Web开发支持【超详细【一篇搞定】】的全部内容。
看完如果对你有帮助,感谢点赞支持!
如果你是电脑端的话,看到右下角的 “一键三连” 了吗,没错点它[哈哈]
加油!
共同努力!
Keafmd