前言
(补充：再linux服务器上可能没用创建文件的权限，那就需要找到文件夹给权限，比如我的chmod -R 777 /home/tomcat/apache-tomcat-default/webapps/food)
- 文件上传：文件上传首先要在xml中配置上传信息，ssm有强大的过滤功能，你不声明让某种类型进来他是进不来的，我是用的是servlet3.0的part上传文件，省掉依赖包。
在web.xml中的springmvc配置中添加下面如下配置（配置方法可能很多，但是功能相同）：
配置
<servlet> <servlet-name> springMvc</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value> classpath*:food-servlet.xml</param-value> </init-param> <load-on-startup> 1</load-on-startup> <multipart-config> <max-file-size> 20971520</max-file-size> <max-request-size> 20971520</max-request-size> <file-size-threshold> 0</file-size-threshold> </multipart-config> </servlet>
代码
下面是我的下载的模板：
import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import com.food.dao.foodMapper; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import javax.servlet.http.Part; import java.io.*; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import com.food.bean.path; @Controller public class uploadController { @Autowired(required = true) private foodMapper foodmapper; @RequestMapping(value="/onfile") public String uploadfile(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { HttpSession session=request.getSession(); request.setCharacterEncoding("UTF-8");// response.setCharacterEncoding("UTF-8"); Part part=request.getPart("file"); upload(part,session); return "sucess"; } public String getname(Part part)//获取文件名 { String contentdisposition=part.getHeader("content-disposition");//form-data; name="file"; filename="jspѧϰ.txt" String[]filename=contentdisposition.split("=");// String filename1=filename[filename.length-1];//"jspѧϰ.txt" String filename2=filename1.replace("\"", ""); return filename2; } public void upload(Part part, HttpSession session) throws IOException { String path=session.getServletContext().getRealPath("food/"); //System.out.println(path); String filename=getname(part); File file=new File(path); if(!file.exists())// { file.mkdirs(); } File file2=new File(file,filename);// if(!file2.exists()){file2.createNewFile();} InputStream in=part.getInputStream(); OutputStream out=new FileOutputStream(file2); BufferedInputStream buf=new BufferedInputStream(in); BufferedOutputStream bufout=new BufferedOutputStream(out); byte by[]=new byte[1024*10]; int q=0; while((q=buf.read(by))!=-1) { bufout.write(by); //by=new byte[1024] } bufout.close(); buf.close(); in.close(); out.close(); } }
这个是我的一个小项目剪出来的下载模板，如果有问题修改修改就可以使用，或者可以私信我。
文件下载：文件上传使用的是传统的模板，有用sringmvc的方法的可以
文件下载的一个大坑：当时下载中文名成发现中文名变成"–"无法显示中文，怎么改编码都没有用，后来看了百度说是tomcat的默认编码is编码问题，解决方法和get请求有时的乱码解决很类似，字符串重新编码。核心是：new String(filename.getBytes(“utf-8”),“ISO8859_1”));
@RequestMapping(value = "/download") public String download(String filename,String path,HttpServletRequest request, HttpServletResponse response) throws IOException { System.out.println(filename); response.setCharacterEncoding("utf-8"); request.setCharacterEncoding("UTF-8"); HttpSession session=request.getSession(); response.setContentType("text/html"); System.out.println(filename); //设置文件MIME类型 response.setContentType(session.getServletContext().getMimeType(filename)); //设置Content-Disposition response.setHeader("Content-Disposition", "attachment;filename=" new String(filename.getBytes("utf-8"),"ISO8859_1")); String fullFileName = session.getServletContext().getRealPath( path); //获取绝对路径 System.out.println(fullFileName); InputStream in = new FileInputStream(fullFileName); BufferedInputStream buf=new BufferedInputStream(in); OutputStream out = response.getOutputStream(); BufferedOutputStream ou=new BufferedOutputStream(out); //PrintWriter out = response.getWriter(); int b=0; byte[]bite=new byte[1024]; while((b=buf.read(bite))!=-1) { ou.write(bite); } ou.close(); buf.close(); in.close(); out.close(); return null; }
文件上传和下载一定要用buffer类，速度差别如果带宽能够满足的话差别还是很大的。
