[石家庄]就业班第二次错题总结 - 黑马程序员技术交流社区

创建人

问题标题

异常错误

问题分类

运行出错

一级话题

Type Exception Report

Message F:\idearProjects\javaweb\out\artifacts\day_15_responce_war_exploded\火影.jpg (系统找不到指定的文件。)

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

java.io.FileNotFoundException: F:\idearProjects\javaweb\out\artifacts\day_15_responce_war_exploded\火影.jpg (系统找不到指定的文件。)

java.base/java.io.FileInputStream.open0(Native Method)

java.base/java.io.FileInputStream.open(FileInputStream.java:196)

java.base/java.io.FileInputStream.<init>(FileInputStream.java:139)

java.base/java.io.FileInputStream.<init>(FileInputStream.java:94)

cn.it.down.DownloadServlet.doPost(DownloadServlet.java:28)

cn.it.down.DownloadServlet.doGet(DownloadServlet.java:54)

javax.servlet.http.HttpServlet.service(HttpServlet.java:635)

javax.servlet.http.HttpServlet.service(HttpServlet.java:742)

org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

问题补充

路径异常,找不到链接的图片的主要路径,获得真实路径的时候出错,无法找到图片位置

附件

String filename = req.getParameter("filename");
// System.out.println(filename);
//获得域对象
ServletContext servletContext = this.getServletContext();
//找到那个图片链接的真实路径
String realPath = servletContext.getRealPath( filename);
//利用字节流将图片加载进内存
FileInputStream fis = new FileInputStream(realPath);
//获取文件的类型
String mimeType = servletContext.getMimeType(filename);

问题答案

真实路径不对外面还有一个文件夹

String filename = req.getParameter("filename");
// System.out.println(filename);
//获得域对象
ServletContext servletContext = this.getServletContext();
//找到那个图片链接的真实路径
String realPath = servletContext.getRealPath("/img/" + filename);
//利用字节流将图片加载进内存
FileInputStream fis = new FileInputStream(realPath);
//获取文件的类型
String mimeType = servletContext.getMimeType(filename);