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JSP/Serlet 使用fileupload上传文件

时间:2014-09-01 22:27:13      阅读:200      评论:0      收藏:0      [点我收藏+]

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需要引用的jar

commons-fileupload-1.3.1.jar

commons-io-2.2.jar

 

index.jsp

  

    <body>  
      <center>  
        <h3>文件上传</h3>  
        <font color="red"><%=request.getAttribute("msg")==null?"":request.getAttribute("msg") %> </font>  
        <form enctype="multipart/form-data" method="post" action="servlet/FileUploadServlet">  
            文件描述:<input type="text" name="text" /><br/>  
            选择文件:<input type="file" name="file1" /><br/>  
            选择文件:<input type="file" name="file2" /><br/>  
            选择文件:<input type="file" name="file3" /><br/>  
            选择文件:<input type="file" name="file4" /><br/>  
            选择文件:<input type="file" name="file5" /><br/>  
            <input type="submit" value="上传" />  
        </form>  
      </center>  
    </body>  

 

 FileUploadServlet.jsp

    package com.accp.fileupload.servlet;  
      
    import java.io.File;  
    import java.io.IOException;  
    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.FileUploadException;  
    import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException;  
    import org.apache.commons.fileupload.disk.DiskFileItemFactory;  
    import org.apache.commons.fileupload.servlet.ServletFileUpload;  
      
    public class FileUploadServlet extends HttpServlet {  
      
        private static final long serialVersionUID = 2827297299439162553L;  
      
        public void doGet(HttpServletRequest request, HttpServletResponse response)  
                throws ServletException, IOException {  
            //使用同一种处理方法  
            doPost(request, response);  
        }  
      
        public void doPost(HttpServletRequest request, HttpServletResponse response)  
                throws ServletException, IOException {  
            request.setCharacterEncoding("UTF-8");  
            response.setContentType("text/html; charset=UTF-8");  
              
            //保存路径  
            String savePath = getServletContext().getRealPath("/upload");  
            File saveDir = new File(savePath);  
            // 如果目录不存在,就创建目录  
            if(!saveDir.exists()){  
                saveDir.mkdir();  
            }  
              
            // 创建文件上传核心类  
            DiskFileItemFactory factory = new DiskFileItemFactory();  
            ServletFileUpload sfu = new ServletFileUpload(factory);  
            //设置编码  
            sfu.setHeaderEncoding("UTF-8");  
            // 设置上传的单个文件的最大字节数为2M  
            sfu.setFileSizeMax(1024*1024*2);  
            //设置整个表单的最大字节数为10M  
            sfu.setSizeMax(1024*1024*10);  
              
            try{  
                // 处理表单请求  
                List<FileItem> itemList = sfu.parseRequest(request);  
                for (FileItem fileItem : itemList) {  
                    // 对应表单中的控件的name  
                    String fieldName = fileItem.getFieldName();  
                    System.out.println("控件名称:" + fieldName);  
                    // 如果是普通表单控件  
                    if(fileItem.isFormField()){  
                        String value = fileItem.getString();  
                        //重新编码,解决乱码  
                        value = new String(value.getBytes("ISO-8859-1"),"UTF-8");  
                        System.out.println("普通内容:" + fieldName + "=" + value);  
                    // 上传文件  
                    }else{  
                        // 获得文件大小  
                        Long size = fileItem.getSize();  
                        // 获得文件名  
                        String fileName = fileItem.getName();  
                        System.out.println("文件名:"+fileName+"\t大小:" + size + "byte");  
                          
                        //设置不允许上传的文件格式  
                        if(fileName.endsWith(".exe")){  
                            request.setAttribute("msg", "不允许上传的类型!");  
                        }else{  
                            //将文件保存到指定的路径  
                            File file = new File(savePath,fileName);  
                            fileItem.write(file);  
                            request.setAttribute("msg", "上传成功!");  
                        }  
                    }  
                }  
            }catch(FileSizeLimitExceededException e){  
                request.setAttribute("msg", "文件太大");  
            }catch(FileUploadException e){  
                e.printStackTrace();  
            }catch(Exception e){  
                e.printStackTrace();  
            }  
            //上传完毕后  转发到首页  
            request.getRequestDispatcher("/index.jsp").forward(request, response);  
        }  
      
    }  

注意要采用action 方式提交表单,不要使用 ajax的方式提交表单,否则会有异常信息。

 

org.apache.commons.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn‘t contain a multipart/form-data or multipart/mixed stream, content type header is null
at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:885)

 

JSP/Serlet 使用fileupload上传文件

标签:style   blog   http   color   os   io   使用   java   strong   

原文地址:http://www.cnblogs.com/daijinming/p/3950107.html

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