Springboot （打成jar运行）上传图片到服务器，客户端可直接通过url访问

本地测试时，直接上传图片到resources/static 文件下没有问题，但是打成jar后，直接报错

   @RequestMapping(value = "/oldUploadImage",method = RequestMethod.POST)
    public void oldUploadImage(MultipartFile image) throws IOException {
        String name = image.getOriginalFilename();
        InputStream inputStream = image.getInputStream();
        String staticPath = ResourceUtils.getFile("classpath:static/").getAbsolutePath();
        Path path = Paths.get(staticPath).resolve(UPLOAD_PATH);
        if (!Files.exists(path)){
            Files.createDirectories(path);
        }
        Files.copy(inputStream,path.resolve(name));
    }

错误信息

java.io.FileNotFoundException: class path resource [static/] cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/D:/360/sell-0.0.1-SNAPSHOT.jar!/BOOT-INF/classes!/static/
        at org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:217)
        at org.springframework.util.ResourceUtils.getFile(ResourceUtils.java:180)
        at com.imooc.sell.controller.image.ImageTest.oldUploadImage(ImageTest.java:34)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
        at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:800)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1471)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Unknown Source)

这个是打成jar后就不可以再动态修改resources文件下的文件了。

解决方法：
（1）在jar外动态创建文件夹，将图片文件上传到该文件夹中，然后给springboot赋予读/写该文件夹的权限，即可使用url直接读写，或使用流将图片输出。
源码：

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.util.ResourceUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * @author peter
 * 2018/10/20 21:32
 */
@Controller
@Slf4j
public class ImageTest {

    private static String UPLOAD_PATH = "File/image/upload";
	
	//上传图片
   
    @RequestMapping(value = "/uploadImage", method = RequestMethod.POST)
    @ResponseBody
    public String uploadImage(MultipartFile image)  {
        try {
            String name = image.getOriginalFilename();

            System.out.println(name);

            InputStream inputStream = image.getInputStream();
            Path directory = Paths.get(UPLOAD_PATH);
            if(!Files.exists(directory)){
                Files.createDirectories(directory);
            }
            long copy = Files.copy(inputStream, directory.resolve(name));

            return "上传成功，大小："+ copy;

        } catch (Exception e) {
            log.error(e.getMessage(), e);
            return "上传失败";
        }

    }
	
	//使用流将图片输出
    @GetMapping("/getImage/{name}")
    public void getImage(HttpServletResponse response, @PathVariable("name")String name) throws IOException {
        response.setContentType("image/jpeg;charset=utf-8");
        response.setHeader("Content-Disposition", "inline; filename=girls.png");
        ServletOutputStream outputStream = response.getOutputStream();
        outputStream.write(Files.readAllBytes(Paths.get(UPLOAD_PATH).resolve(name)));
        outputStream.flush();
        outputStream.close();
    }


}

（2）实现WebMvcConfigurer 重写addResourceHandlers（ResourceHandlerRegistry registry）方法，给新建的外部文件夹注册（赋予读/写权限）配置到springboot中即可

@SpringBootApplication
public class DemoApplication implements WebMvcConfigurer {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/File/**")
                .addResourceLocations("file:File/");
    }
}

测试：在static 文件下新建index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="icon" href="favicon.ico">
</head>
<body>
    <form action="http://localhost:8080/uploadImage" method="post" enctype="multipart/form-data">
        <input name="image" type="file">
        <input type="submit" value="提交">
    </form>
</body>
</html>

1、本地测试

http://localhost:8080/index.html

上传图片后，发现在springboot项目下多出一个File文件夹

输入

http://localhost:9000/sell/getImage/ss.jpg

或

http://localhost:8080/File/image/upload/ss.jpg

都可看到图片

2、打包后测试

mvn package
java -jar demo-0.0.1-SNAPSHOT.jar --server.port=8080

输入上述地址依然可看图片，只不过新创建的文件夹在jar包的同目录下创建