spring-boot:在源码路径下创建文件

spring-boot： url和uri

2018-12-27 10:33:04.813 INFO 61770 --- [http-nio-8080-exec-1] o.s.a.controller.DemoController :

uri = /Users/benjamin/opt/tomcat-8.5.37/webapps/access-resources-0.0.1-SNAPSHOT/WEB-INF/classes/static/one_3.jpg

2018-12-27 10:33:04.813 INFO 61770 --- [http-nio-8080-exec-1] o.s.a.controller.DemoController :

path = static/one_3.jpg
2018-12-27 10:33:04.813 INFO 61770 --- [http-nio-8080-exec-1] o.s.a.controller.DemoController :

file = /Users/benjamin/opt/tomcat-8.5.37/webapps/access-resources-0.0.1-SNAPSHOT/WEB-INF/classes/static/one_3.jpg

2018-12-27 10:33:04.813 INFO 61770 --- [http-nio-8080-exec-1] o.s.a.controller.DemoController :

url = file:/Users/benjamin/opt/tomcat-8.5.37/webapps/access-resources-0.0.1-SNAPSHOT/WEB-INF/classes/static/one_3.jpg

ClassPathResource resource = new ClassPathResource("static/one_3.jpg");

    InputStream inputStream = resource.getInputStream();

    String uri = "uri = " + resource.getURI().getPath();


    String path = "path = " + resource.getPath();

    String file = " file = " + resource.getFile().getAbsolutePath();


    String url = "url = " + resource.getURL().toString();

    logger.info(uri);
    logger.info(path);
    logger.info(file);
    logger.info(url);

3. 获取资源

String img_01 = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1545888795792&di=099850428a3eda98ad94e85389c25196&imgtype=0&src=http%3A%2F%2Fd.hiphotos.baidu.com%2Fimage%2Fpic%2Fitem%2F9825bc315c6034a84d0cf125c6134954082376a3.jpg";

    UrlResource urlResource = new UrlResource(img_01);


    InputStream inputStream = urlResource.getInputStream();

4. classpath: 创建新的文件：

/**
*
* 1. 找到项目classes目录所在位置：
* 举例：/Users/benjamin/opt/tomcat-8.5.37/webapps/access-resources-0.0.1-SNAPSHOT/WEB-INF/classes
*
* 为了找到classes目录所在的位置： 在源码中添加 static/one_3.jpg
*
*
*
* 2。 创建文件：
*
*
*
*
*
* // 1。 获取当前文件的路径：
* String demoimg = "static/one_3.jpg";
* ClassPathResource tempResource = new ClassPathResource(demoimg);
* String path = tempResource.getURI().getPath();
* logger.info("host:" + path);
* String parentpath = path.substring(0, path.lastIndexOf(demoimg));
* logger.info("parentpath:" + parentpath);
*
* //2。 创建新的文件
* File newFile = new File(parentpath, "static/xxx.png");
* FileUtils.touch(newFile);
*
* FileOutputStream outputStream = new FileOutputStream(newFile);
*
*
*
*/

5. filesystem和classpath

// 1。 获取当前文件的路径：
String demoimg = "static/one_3.jpg";
ClassPathResource tempResource = new ClassPathResource(demoimg);
String path = tempResource.getURI().getPath();
logger.info("host:" + path);
String parentpath = path.substring(0, path.lastIndexOf(demoimg));
logger.info("parentpath:" + parentpath);

    FileSystemResource fileSystemResource = new FileSystemResource(demoimg);
    String osUri = fileSystemResource.getURI().toString();
    logger.info("osPath:" + osUri);

classpath:

2018-12-27 11:20:45.839 INFO 62230 --- [nio-8080-exec-1] o.s.a.controller.DemoController : host:/Users/benjamin/idea-workspace/springboot-example/access-resources/target/classes/static/one_3.jpg

fileSystem:

2018-12-27 11:20:45.839 INFO 62230 --- [nio-8080-exec-1] o.s.a.controller.DemoController : osPath:file:/Users/benjamin/idea-workspace/springboot-example/get-started/static/one_3.jpg

运行在tomcat/webapps/项目

2018-12-27 11:26:26.567 INFO 62329 --- [http-nio-8080-exec-1] o.s.a.controller.DemoController :
host:/Users/benjamin/opt/tomcat-8.5.37/webapps/access-resources-0.0.1-SNAPSHOT/WEB-INF/classes/static/one_3.jpg
2018-12-27 11:26:26.568 INFO 62329 --- [http-nio-8080-exec-1] o.s.a.controller.DemoController : parentpath:/Users/benjamin/opt/tomcat-8.5.37/webapps/access-resources-0.0.1-SNAPSHOT/WEB-INF/classes/
2018-12-27 11:26:26.568 INFO 62329 --- [http-nio-8080-exec-1] o.s.a.controller.DemoController : osPath:file:/Users/benjamin/opt/tomcat-8.5.37/bin/static/one_3.jpg

spring-boot: resouces： 资源访问api

/* ClassPathResource resource = new ClassPathResource("static/one_3.jpg");

    InputStream inputStream = resource.getInputStream();

    String uri = "uri = " + resource.getURI().getPath();


    String path = "path = " + resource.getPath();

    String file = " file = " + resource.getFile().getAbsolutePath();


    String url = "url = " + resource.getURL().toString();

    logger.info(uri);
    logger.info(path);
    logger.info(file);
    logger.info(url);*/

    String img_01 = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1545888795792&di=099850428a3eda98ad94e85389c25196&imgtype=0&src=http%3A%2F%2Fd.hiphotos.baidu.com%2Fimage%2Fpic%2Fitem%2F9825bc315c6034a84d0cf125c6134954082376a3.jpg";
    UrlResource urlResource = new UrlResource(img_01);
    InputStream inputStream = urlResource.getInputStream();

    // 1。 获取当前文件的路径：
    String demoimg = "static/one_3.jpg";
    ClassPathResource tempResource = new ClassPathResource(demoimg);
    String path = tempResource.getURI().getPath();
    logger.info("host:" + path);
    String parentpath = path.substring(0, path.lastIndexOf(demoimg));
    logger.info("parentpath:" + parentpath);

    //2。 创建新的文件
    File newFile = new File(parentpath, "static/xxx.png");
    FileUtils.touch(newFile);

    FileOutputStream outputStream = new FileOutputStream(newFile);




 /*   FileSystemResource fileSystemResource = new FileSystemResource(demoimg);
    String osUri = fileSystemResource.getURI().toString();
    logger.info("osPath:" + osUri);*/


   /* ClassPathResource classPathResource = new ClassPathResource("static/xxx.jpg");
    if (!classPathResource.exists()) {
        logger.info("file abspath:" + classPathResource.getFile().getAbsolutePath());
        logger.info("exist: " + classPathResource.exists());
    }

*/

    byte[] bytes = new byte[1024];

    int len = 0;

    while ((len = inputStream.read(bytes)) != -1) {

        outputStream.write(bytes, 0, len);
    }