springboot打成jar后获取classpath下文件失败的解决方案

springboot打成jar后获取classpath下文件失败的解决方案

springboot打成jar后获取classpath下文件

代码如下：

ClassPathResource resource = new ClassPathResource("app.keystore");

File file = resource.getFile();

FileUtils.readLines(file).forEach(System.out::println);

解决方式如下：

1. Spring framework

String data = "";

ClassPathResource cpr = new ClassPathResource("static/file.txt");

try {

byte[] bdata = FileCopyUtils.copyToByteArray(cpr.getInputStream());

data = new String(bdata, StandardCharsets.UTF_8);

} catch (IOException e) {

LOG.warn("IOException", e);

}

2.use a file

ClassPathResource classPathResource = new ClassPathResource("static/something.txt");

InputStream inputStream = classPathResource.getInputStream();

File somethingFile = File.createTempFile("test", ".txt");

try {

FileUtils.copyInputStreamToFile(inputStream, somethingFile);

} finally {

IOUtils.closeQuietly(inputStream);

}

Resource resource = new ClassPathResource("data.sql");

BufferedReader reader = new BufferedReader(new InputStreamReader(resource.getInputStream()));

reader.lines().forEach(System.out::println);

String content = new ClassPathResourceReader("data.sql").getContent();

@Value("${resourceLoader.file.location}")

@Setter

private String location;

private final ResourceLoader resourceLoader;

public void readallfilesfromresources() {

Resource[] resources;

try {

resources = ResourcePatternUtils.getResourcePatternResolver(resourceLoader).getResources("classpath:" + location + "/*.json");

for (int i = 0; i < resources.length; i++) {

try {

InputStream is = resources[i].getInputStream();

byte[] encoded = IOUtils.toByteArray(is);

String content = new String(encoded, Charset.forName("UTF-8"));

}

}

} catch (IOException e) {

throw new UncheckedIOException(e);

}

}

springboot-项目获取resources下文件碰到的问题（classPath下找不到文件和文件名乱码）

项目是spring-boot + spring-cloud 并使用maven 管理依赖。在springboot+maven项目下怎么读取resources下的文件实现文件下载？

怎么获取resources目录下的文件？（相对路径）

方法一：

File sourceFile = ResourceUtils.getFile("classpath:templateFile/test.xlsx"); //这种方法在linux下无法工作

方法二：

Resource resource = new ClassPathResource("templateFile/test.xlsx"); File sourceFile = resource.getFile();

我使用的是第二种。

@PostMapping("/downloadTemplateFile")

public JSONData downloadTemplateFile(HttpServletResponse response) {

String filePath = "templateFile/test.xlsx";

Resource resource = new ClassPathResource(filePath);//用来读取resources下的文件

InputStream is = null;

BufferedInputStream bis = null;

OutputStream os = null;

try {

File file = resource.getFile();

if (!file.exists()) {

return new JSONData(false,"模板文件不存在");

}

is = new FileInputStream(file);

os = response.getOutputStream();

bis = new BufferedInputStream(is);

//设置响应头信息

response.setCharacterEncoding("UTF-8");

this.response.setContentType("application/octet-stream; charset=UTF-8");

StringBuffer contentDisposition = new StringBuffer("attachment; filename=\"");

String fileName = new String(file.getName().getBytes(), "utf-8");

contentDisposition.append(fileName).append("\"");

this.response.setHeader("Content-disposition", contentDisposition.toString());

//边读边写

byte[] buffer = new byte[500];

int i;

while ((i = bis.read(buffer)) != -1) {

os.write(buffer, 0, i);

}

os.flush();

} catch (FileNotFoundException e) {

e.printStackTrace();

return new JSONData(false,"模板文件不存在");

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if(os != null) os.close();

if(bis != null) bis.close();

if(is != null) is.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return new JSONData("模板文件下载成功");

}

高高兴兴的启动项目后发现还是找不到文件，错误日志：

java.io.FileNotFoundException: class path resource [templateFile/test.xlsx] cannot be resolved to URL because it does not exist

at org.springframework.core.io.ClassPathResource.getURL(ClassPathResource.java:195)

at org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:129)

at com.citycloud.parking.support.controller.operate.OperateBusinessUserController.downloadTemplateFile(OperateBusinessUserController.java:215)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

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.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:158)

at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:126)

at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:111)

at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)

因为我知道Resource resource = new ClassPathResource("templateFile/test.xlsx");就是到classPath*（注意这里有个*）下去找，然后就去项目本地的目录下找classPath下是否有这个文件（maven的classPath在 “target\classes”目录下），就发现并没有这个文件在。

后面仔细想想这是Maven项目啊，所以就找pom.xml文件去看看，突然想起：springboot的maven默认只会加载classPath同级目录下文件（配置那些），其他的需要配置标签：

src/main/java

**/*.properties

**/*.xml

false

src/main/resources

**/*.properties

**/*.xml

**/*.yml

**/dockerfile

**/*.xlsx

false

重新启动，再到classPath下看，发QqGteX现有了这个文件了，同时也能获取了。如果文件名为中文的话就会出现乱码的情况。

怎么解决文件名中文乱码？

Access-Control-Allow-Origin →*

Access-Control-Allow-Credentials →true

Access-Control-Allow-Headers →accessToken,Access-Control-Allow-Origin,Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers

Access-Control-Allow-Methods →POST,GET,PUT,PATCH,DELETE,OPTIONS,HEAD

Access-Control-Max-Age →360

Content-disposition →attachment; filename="????????-??????????.xlsx"

Content-Type →application/octet-stream;charset=UTF-8

Transfer-Encoding →chunked

Date →Fri, 19 Apr 2019 06:47:34 GMT

上面是使用postman测试中文乱码response响应头相关信息。

后面怎么改都乱码，然后我就试着到浏览器中请求试试，结果发现只是postman的原因，只要文件名编码跟返回内容编码一致（"Content-disposition"和“ContentType”）就行：

this.response.setContentType("application/octet-stream; charset=iso-8859-1");

StringBuffer contentDisposition = new StringBuffer("attachment; filename=\"");

String fileName = file.getName();

contentDisposition.append(fileName).append("\"");

//设置文件名编码

String contentDispositionStr = new String(contentDisposition.toString().getBytes(), "iso-8859-1");

this.response.setHeader("Content-disposition", contentDispositionStr);

到此全部结束！

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