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java 大文件上传?解决方案

热度:7665   发布时间:2013-02-25 21:18:38.0
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    }}
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