fileupload上传代码

男娘i 2022-09-19 12:23 171阅读 0赞

fileupload上传代码

![None.gif][]   
![None.gif][] import  java.io.IOException;  
![None.gif][] import  java.io.PrintWriter;  
![None.gif][]  
![None.gif][] import  javax.servlet.ServletException;  
![None.gif][] import  javax.servlet.http.HttpServlet;  
![None.gif][] import  javax.servlet.http.HttpServletRequest;  
![None.gif][] import  javax.servlet.http.HttpServletResponse;  
![None.gif][]  
![None.gif][] import  org.apache.commons.fileupload. \* ;  
![None.gif][] import  java.util. \* ;  
![None.gif][] import  java.util.regex. \* ;  
![None.gif][] import  java.io. \* ;  
![None.gif][] import  java.net.ResponseCache;  
![None.gif][]  
![None.gif][] import  org.apache.commons.fileupload.servlet. \* ;  
![None.gif][] import  org.apache.commons.fileupload.disk.DiskFileItemFactory;  
![None.gif][]  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] /\*\*/ /\*  
![InBlock.gif][] \* 创建日期 2005-4-10  
![InBlock.gif][] \*  
![InBlock.gif][] \* TODO 要更改此生成的文件的模板，请转至  
![InBlock.gif][] \* 窗口 － 首选项 － Java － 代码样式 －代码模板  
![ExpandedBlockEnd.gif][] \*/   
![None.gif][]  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] /\*\* \*/ /\*\*  
![InBlock.gif][] \* @author gaolong1  
![InBlock.gif][] \*   
![InBlock.gif][] \* TODO 要更改此生成的类型注释的模板，请转至 窗口 － 首选项 － Java － 代码样式 －代码模板  
![ExpandedBlockEnd.gif][] \*/   
![None.gif][] public   class  upload  extends  HttpServlet  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ... \{  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    /\*\* \*//\*\*  
![InBlock.gif][]     \* Destruction of the servlet. <br>  
![ExpandedSubBlockEnd.gif][]     \*/  
![InBlock.gif][]    private String uploadPath = "D:/upload/"; // 用于存放上传文件的目录  
![InBlock.gif][]  
![InBlock.gif][]    private File tempPath = new File("D:/upload/tmp/"); // 用于存放临时文件的目录  
![InBlock.gif][]  
![InBlock.gif][]    public void destroy()  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ...\{  
![InBlock.gif][]        super.destroy(); // Just puts "destroy" string in log  
![InBlock.gif][]        // Put your code here  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    /\*\* \*//\*\*  
![InBlock.gif][]     \* The doPost method of the servlet. <br>  
![InBlock.gif][]     \*   
![InBlock.gif][]     \* This method is called when a form has its tag value method equals to  
![InBlock.gif][]     \* post.  
![InBlock.gif][]     \*   
![InBlock.gif][]     \* @param request  
![InBlock.gif][]     \*            the request send by the client to the server  
![InBlock.gif][]     \* @param response  
![InBlock.gif][]     \*            the response send by the server to the client  
![InBlock.gif][]     \* @throws ServletException  
![InBlock.gif][]     \*             if an error occurred  
![InBlock.gif][]     \* @throws IOException  
![InBlock.gif][]     \*             if an error occurred  
![ExpandedSubBlockEnd.gif][]     \*/  
![InBlock.gif][]    public void doPost(HttpServletRequest req, HttpServletResponse res)  
![InBlock.gif][]            throws ServletException, IOException  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ...\{  
![InBlock.gif][]        res.setContentType("text/html; charset=GB2312");  
![InBlock.gif][]        PrintWriter out = res.getWriter();  
![InBlock.gif][]        System.out.println(req.getContentLength());  
![InBlock.gif][]        System.out.println(req.getContentType());  
![InBlock.gif][]        DiskFileItemFactory factory = new DiskFileItemFactory();  
![InBlock.gif][]        // maximum size that will be stored in memory  
![InBlock.gif][]//         设置最多只允许在内存中存储的数据,单位:字节  
![InBlock.gif][]//         设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录  
![InBlock.gif][]        factory.setSizeThreshold(4\*1024);  
![InBlock.gif][]        // the location for saving data that is larger than getSizeThreshold()  
![InBlock.gif][]        factory.setRepository(new File("d:/upload/addnetFile/temp"));  
![InBlock.gif][]  
![InBlock.gif][]        ServletFileUpload upload = new ServletFileUpload(factory);  
![InBlock.gif][]        // maximum size before a FileUploadException will be thrown  
![InBlock.gif][]//         设置允许用户上传文件大小,单位:字节  
![InBlock.gif][]          
![InBlock.gif][]        int maxUploadSize = 2\*1024\*1024;  
![InBlock.gif][]        upload.setSizeMax(maxUploadSize);  
![InBlock.gif][]        System.out.println("ww");  
![InBlock.gif][]        try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ...\{  
![InBlock.gif][]            List fileItems = upload.parseRequest(req);  
![InBlock.gif][]            System.out.println(fileItems.size());  
![InBlock.gif][]            System.out.println(fileItems.get(0));  
![InBlock.gif][]            // assume we know there are two files. The first file is a small  
![InBlock.gif][]            // text file, the second is unknown and is written to a file on  
![InBlock.gif][]            // the server  
![InBlock.gif][]            Iterator iter = fileItems.iterator();  
![InBlock.gif][]  
![InBlock.gif][]            // 正则匹配，过滤路径取文件名  
![InBlock.gif][]            String regExp = ".+//(.+)$";  
![InBlock.gif][]  
![InBlock.gif][]            // 过滤掉的文件类型  
![InBlock.gif][]            String\[\] errorType =  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ...\{ ".exe", ".com", ".cgi", ".asp" \};  
![InBlock.gif][]            Pattern p = Pattern.compile(regExp);  
![InBlock.gif][]            while (iter.hasNext())  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ...\{  
![InBlock.gif][]                System.out.println("FileItem");  
![InBlock.gif][]                FileItem item = (FileItem) iter.next();  
![InBlock.gif][]                // 忽略其他不是文件域的所有表单信息  
![InBlock.gif][]                System.out.println("aaaaaaaaa");  
![InBlock.gif][]                System.out.println(item.getContentType());  
![InBlock.gif][]                System.out.println("aaaaaaaaa");  
![InBlock.gif][]                if (!item.isFormField())  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                ...\{  
![InBlock.gif][]                    System.out.println("bbbbbbbbbbb");  
![InBlock.gif][]                    String name = item.getName();  
![InBlock.gif][]                    long size = item.getSize();  
![InBlock.gif][]                    if ((name == null || name.equals("")) && size == 0)  
![InBlock.gif][]                        continue;  
![InBlock.gif][]                    if(size > maxUploadSize)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                    ...\{  
![InBlock.gif][]                        out.println("<script>alert('您上传的文件超过允许的大小,请重新上传此文件!')</script>");  
![InBlock.gif][]                        continue;  
![ExpandedSubBlockEnd.gif][]                    \}  
![InBlock.gif][]                    Matcher m = p.matcher(name);  
![InBlock.gif][]                    boolean result = m.find();  
![InBlock.gif][]                    if (result)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                    ...\{  
![InBlock.gif][]                        for (int temp = 0; temp < errorType.length; temp\++)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                        ...\{  
![InBlock.gif][]                            if (m.group(1).endsWith(errorType\[temp\]))  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                            ...\{  
![InBlock.gif][]                                throw new IOException(name \+ ": wrong type");  
![ExpandedSubBlockEnd.gif][]                            \}  
![ExpandedSubBlockEnd.gif][]                        \}  
![InBlock.gif][]                        try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                        ...\{  
![InBlock.gif][]                              
![InBlock.gif][]                            Calendar calendar = Calendar.getInstance();  
![InBlock.gif][]                            String year = new Integer( calendar.get(Calendar.YEAR)).toString();  
![InBlock.gif][]                            String month = new Integer( calendar.get(Calendar.MONTH) \+ 1).toString();  
![InBlock.gif][]                            String day = new Integer( calendar.get(Calendar.DATE)).toString();  
![InBlock.gif][]                            String hour = new Integer( calendar.get(Calendar.HOUR\_OF\_DAY)).toString();  
![InBlock.gif][]                            String minute = new Integer( calendar.get(Calendar.MINUTE)).toString();  
![InBlock.gif][]                            String second = new Integer( calendar.get(Calendar.SECOND)).toString();  
![InBlock.gif][]  
![InBlock.gif][]                            // 保存上传的文件到指定的目录  
![InBlock.gif][]  
![InBlock.gif][]                            // 在下文中上传文件至数据库时，将对这里改写  
![InBlock.gif][]                            //不要直接用d:/这样跨平台不行,改成相对路径  
![InBlock.gif][]                              
![InBlock.gif][]                            String uploadPath = "d:/" \+ year \+ "/" \+ month \+ "/" \+ day \+ "/";  
![InBlock.gif][]                            String uploadFileName = year \+ month \+ day \+ hour \+ minute \+ second \+ m.group(1);  
![InBlock.gif][]                              
![InBlock.gif][]                            File uploadDir = new File(uploadPath);  
![InBlock.gif][]                              
![InBlock.gif][]                            if(!uploadDir.exists())  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                            ...\{  
![InBlock.gif][]                                if(uploadDir.mkdirs())  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                                ...\{  
![InBlock.gif][]                                    System.out.println("success");  
![ExpandedSubBlockEnd.gif][]                                \}  
![InBlock.gif][]                                else  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                                ...\{  
![InBlock.gif][]                                    System.out.println("create dir faile");  
![ExpandedSubBlockEnd.gif][]                                \}  
![ExpandedSubBlockEnd.gif][]                            \}  
![InBlock.gif][]                              
![InBlock.gif][]                              
![InBlock.gif][]                            //File uploadFile = new File(uploadPath + uploadFileName);  
![InBlock.gif][]                            //uploadFile.createNewFile();  
![InBlock.gif][]                              
![InBlock.gif][]                            //item.write(new File("d:/" + m.group(1)));  
![InBlock.gif][]                              
![InBlock.gif][]                            item.write(new File(uploadPath \+ uploadFileName));  
![InBlock.gif][]                              
![InBlock.gif][]                            System.out.println(uploadFileName \+ "  " \+ size \+ "<br>");  
![ExpandedSubBlockEnd.gif][]                        \}  
![InBlock.gif][]                        catch (Exception e)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                        ...\{  
![InBlock.gif][]                            out.println(e);  
![ExpandedSubBlockEnd.gif][]                        \}  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]                    \}  
![InBlock.gif][]                    else  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                    ...\{  
![InBlock.gif][]                        throw new IOException("fail to upload");  
![ExpandedSubBlockEnd.gif][]                    \}  
![ExpandedSubBlockEnd.gif][]                \}  
![ExpandedSubBlockEnd.gif][]            \}  
![ExpandedSubBlockEnd.gif][]        \}  
![InBlock.gif][]        catch (IOException e)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ...\{  
![InBlock.gif][]            out.println(e);  
![ExpandedSubBlockEnd.gif][]        \}  
![InBlock.gif][]        catch (FileUploadException e)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ...\{  
![InBlock.gif][]            out.println(e);  
![ExpandedSubBlockEnd.gif][]        \}  
![InBlock.gif][]  
![InBlock.gif][]        // 保存上传的文件到指定的目录  
![InBlock.gif][]  
![InBlock.gif][]        // 在下文中上传文件至数据库时，将对这里改写  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![InBlock.gif][]    protected void doGet(HttpServletRequest request,  
![InBlock.gif][]            HttpServletResponse response) throws ServletException, IOException  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ...\{  
![InBlock.gif][]        // TODO Auto-generated method stub  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    /\*\* \*//\*\*  
![InBlock.gif][]     \* Initialization of the servlet. <br>  
![InBlock.gif][]     \*   
![InBlock.gif][]     \* @throws ServletException  
![InBlock.gif][]     \*             if an error occure  
![ExpandedSubBlockEnd.gif][]     \*/  
![InBlock.gif][]    public void init() throws ServletException  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ...\{  
![InBlock.gif][]        // Put your code here  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

html测试代码

![None.gif][] <! DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" >   
![None.gif][] < html >   
![None.gif][] < head >   
![None.gif][] < meta  http-equiv ="multipart"  content ="form-data; charset=UTF-8" >   
![None.gif][] < title > Insert title here </ title >   
![None.gif][] </ head >   
![None.gif][] < body >   
![None.gif][]     < form  id ="form1"  name ="form1"  enctype ="multipart/form-data"  method ="post"  action ="FileUpload" >   
![None.gif][]         < input  id =aa  name =file1  type ="file" />   
![None.gif][]         < input  id =bb  name =file2  type ="file" />   
![None.gif][]         < input  type ="submit"  name ="Submit"  value ="submit"   />   
![None.gif][]     </ form >   
![None.gif][] </ body >   
![None.gif][] </ html >   
![None.gif][]

这两段代码都能正确执行.

但我遇到一个怪问题,不知是tomcat的问题,还是哪的问题,这两段代码三个月前我写的时候能正确运行,昨天我重新试了半天,却不能运行了,也没报错,就是上传不了,今天,我什么都没改,却又能运行了,怪了,昨天我重起过tomcat,都不行.在我的编程经历中,遇到过好几次这样的情况,不知是怎么回事

补记:

用common-fileupload上传文件有个小地方一定要注意,即<input id=aa name=file1 type=file/>中的name一定要写,如果没写就会出现我上面的错误,上传不了文件,但却不报错.

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[InBlock.gif]: /images/20220828/0823462cafcf430d88908f66d7beb8b7.png
[ExpandedBlockEnd.gif]: /images/20220828/0dfd9ba2dcfc43298286f4fcd16d8150.png
[ExpandedSubBlockStart.gif]: http://images.csdn.net/syntaxhighlighting/OutliningIndicators/ExpandedSubBlockStart.gif
[ContractedSubBlock.gif]: /images/20220828/4d686b00ac9d41c5a2cf4285f63c9d8d.png
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