大文件上传 解决方案
场景：java 大文件上传?解决方案
java 大文件上传????????????
我想在java中实现大文件的上传(大概500M),
自己写的上传小一点文件还行,大一点的就崩溃了!!!
有没有这方面的例子????
不胜感激!!!!!!!!!!!
------解决方案--------------------
设置好缓冲500M应该是能承受的喵~~``
不知道楼主怎么实现的...
------解决方案--------------------
500M不是个小数目，能上传也很慢把
------解决方案--------------------
这么大的文件，晕哦，客户端提交数据，肯定全部都会缓存到你的服务器上来，你服务器内存不够肯定死了撒，呵呵，这么大的文件用其他方式吧，边读边写。用web上传它是一并传上来的，你搞不定的。
------解决方案--------------------
用apache上传组件吧
------解决方案--------------------
我这有个例子,没写注释
java 大文件上传????????????
我想在java中实现大文件的上传(大概500M),
自己写的上传小一点文件还行,大一点的就崩溃了!!!
有没有这方面的例子????
不胜感激!!!!!!!!!!!
------解决方案--------------------
设置好缓冲500M应该是能承受的喵~~``
不知道楼主怎么实现的...
------解决方案--------------------
500M不是个小数目，能上传也很慢把
------解决方案--------------------
这么大的文件，晕哦，客户端提交数据，肯定全部都会缓存到你的服务器上来，你服务器内存不够肯定死了撒，呵呵，这么大的文件用其他方式吧，边读边写。用web上传它是一并传上来的，你搞不定的。
------解决方案--------------------
用apache上传组件吧
------解决方案--------------------
我这有个例子,没写注释
- Java code
package com.fuyou;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class Fileupload extends HttpServlet {
/**
* Constructor of the object.
*/
public Fileupload() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to
* post.
*
* @param request
* the request send by the client to the server
* @param response
* the response send by the server to the client
* @throws ServletException
* if an error occurred
* @throws IOException
* if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System.out.println("requestCo"+"=="+request.getContentType());
response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
// 设置保存的文件的目录
String uploadDir = getServletContext().getRealPath("/upload");
System.out.println(uploadDir);
if (uploadDir == null) {
out.println("无法访问存储目录!");
return;
}
File fUploadDir = new File(uploadDir);
if (!fUploadDir.exists()) {
if(!fUploadDir.mkdir()){
out.println("无法创建存储目录!");
return;
}
}
if (!ServletFileUpload.isMultipartContent(request)) {
out.println("只能外理mul的类型的数据");
return;
}
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload fu = new ServletFileUpload(factory);//关键类
fu.setSizeMax(1024 * 1024 * 400);
// FileItemFactory factory = new DiskFileItemFactory();
DiskFileItemFactory s = new DiskFileItemFactory();//设置临时文件最大值,如果大于这个值,就建一临时文件
s.setSizeThreshold(1024*1024);
fu.setHeaderEncoding("gb2312");
List fileItem = null;
try {
fileItem = fu.parseRequest(request);
} catch (FileUploadException e) {
out.println("解析出错了");
e.printStackTrace(out);
return;
}
Iterator i = fileItem.iterator();
while (i.hasNext()) {
FileItem fi = (FileItem) i.next();
if (fi.isFormField()) {
String content = fi.getString("gb2312");
String fieldName = fi.getFieldName();
System.out.println(fieldName+content);
} else {
String pathSrc = fi.getName();
if (pathSrc.trim().equals("")) {
continue;
}
int start = pathSrc.lastIndexOf("\\");
String fileName = pathSrc.substring(start + 1);
File pathDest = new File(uploadDir, fileName);
try {
fi.write(pathDest);
String fieldName = fi.getFieldName();
request.setAttribute(fileName, fileName);
} catch (Exception e) {
out.println("存储文件出现问题");
e.printStackTrace(out);
return;
}finally{
fi.delete();
}
}
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException
* if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
------解决方案--------------------
如果你不使用插件，那么速度会慢的惊人。当然，上传是可以的。
你所谓的崩溃是你在内存处理了所有的上传数据，你应该把他们保存到临时文件里，而不是全部在内存处理
------解决方案--------------------
你上传崩溃是你的服务器不行
------解决方案--------------------
建议用applet或ftp
------解决方案--------------------
500M？
用fileupload的吧
------解决方案--------------------
smartUpload或者fileupload插件都可以的
smartUpload就是为了实现文件上传功能的