Web 开发中 文件上传 是出现的：java.io.FileNotFoundException: (文件名、目录名或卷标语法不正确。) 



    

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    <span style="font-family: Arial, Helvetica, sans-serif; ">
    

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    </span>
    

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<span style="font-family: Arial, Helvetica, sans-serif; "><span style="color:#ff0000;">一 环境的搭建：</span></span>




eclipase + javaEE +  commons-fileupload-1.2.1.jar + commons-io-2.0.jar   +  tomcat 7.0.68


​


二  文件上传的servlet 代码实现！


 


 




    

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    package com.baidu.fileupload.servlet;
    

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    import java.io.File;
    

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    import java.io.FileOutputStream;
    

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    import java.io.IOException;
    

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    import java.io.InputStream;
    

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    import java.io.OutputStream;
    

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    import java.util.List;
    

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    import javax.servlet.ServletException;
    

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    import javax.servlet.annotation.WebServlet;
    

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    import javax.servlet.http.HttpServlet;
    

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    import javax.servlet.http.HttpServletRequest;
    

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    import javax.servlet.http.HttpServletResponse;
    

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    import org.apache.commons.fileupload.FileItem;
    

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    import org.apache.commons.fileupload.FileUploadException;
    

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    import org.apache.commons.fileupload.disk.DiskFileItemFactory;
    

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    import org.apache.commons.fileupload.servlet.ServletFileUpload;
    

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    @WebServlet("/uploadServlet")
    

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    public class UploadServlet extends HttpServlet {
    

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    private static final long serialVersionUID = 1L;
    

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    protected void doPost(HttpServletRequest request, 
    

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    HttpServletResponse response) throws ServletException, IOException {
    

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    DiskFileItemFactory factory = new DiskFileItemFactory();
    

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    factory.setSizeThreshold(1024*500);
    

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    File tempDirectory = new File("d:\\tempDirectory");
    

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    factory.setRepository(tempDirectory);
    

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    ServletFileUpload upload = new ServletFileUpload(factory);
    

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    try {
    

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    List<FileItem> items = upload.parseRequest(request);
    

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    for(FileItem item:items){
    

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    if(item.isFormField()){
    

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    String name = item.getFieldName();
    

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    String value = item.getString();
    

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    System.out.println( name + " : " + value);
    

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    }else{
    

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    String fieldName = item.getFieldName();
    

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    String fileName = item.getName();
    

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    String contentType = item.getContentType();
    

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    long sizeInBytes = item.getSize();
    

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    System.out.println(fieldName);
    

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    System.out.println(fileName);
    

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    System.out.println(contentType);
    

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    System.out.println(sizeInBytes);
    

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    InputStream in = item.getInputStream();
    

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    byte[] buffer = new byte[1024];
    

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    int len = 0;
    

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    fileName = "d:\\files\\" + fileName;
    

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    System.out.println(fileName);
    

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    OutputStream out = new FileOutputStream(fileName);
    

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    while((len = in.read(buffer)) != -1){
    

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    out.write(buffer, 0, len);
    

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    }
    

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    out.close();
    

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    in.close();
    

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    }
    

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    }
    

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    } catch (FileUploadException e) {
    

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    e.printStackTrace();
    

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    }
    

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    }
    

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    }
    

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三  JSP 编写


update.jsp


 




    

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    <%@ page language="java" contentType="text/html; charset=UTF-8"
    

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    pageEncoding="UTF-8"%>
    

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    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    

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    <html>
    

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    <head>
    

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    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    

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    <title>Insert title here</title>
    

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    </head>
    

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    <body>
    

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    <form action="uploadServlet" method="post" enctype="multipart/form-data">
    

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    File: <input type="file" name="file" />
    

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    <br><br> 
    

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    <br><br> 
    

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    DESC: <input type="text" name="desc" />
    

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    <br><br> 
    

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    <br><br> 
    

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    <input type="submit" value="Submit" />
    

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    </form> 
    

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    </body>
    

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    </html>
    

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四， 运行过程中出现的问题


​


 


​


 


 五， 解决的办法：


进过一番百度， 无意中看到一位朋友提到，不同的浏览器对上传的文件名的处理方式不太一样 ，进过一番实验，搞定，且增加了一行代码！


 




    

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    package com.baidu.fileupload.servlet;
    

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    import java.io.File;
    

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    import java.io.FileOutputStream;
    

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    import java.io.IOException;
    

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    import java.io.InputStream;
    

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    import java.io.OutputStream;
    

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    import java.util.List;
    

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    import javax.servlet.ServletException;
    

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    import javax.servlet.annotation.WebServlet;
    

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    import javax.servlet.http.HttpServlet;
    

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    import javax.servlet.http.HttpServletRequest;
    

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    import javax.servlet.http.HttpServletResponse;
    

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    import org.apache.commons.fileupload.FileItem;
    

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    import org.apache.commons.fileupload.FileUploadException;
    

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    import org.apache.commons.fileupload.disk.DiskFileItemFactory;
    

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    import org.apache.commons.fileupload.servlet.ServletFileUpload;
    

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    @WebServlet("/uploadServlet")
    

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    public class UploadServlet extends HttpServlet {
    

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    private static final long serialVersionUID = 1L;
    

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    protected void doPost(HttpServletRequest request, 
    

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    HttpServletResponse response) throws ServletException, IOException {
    

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    DiskFileItemFactory factory = new DiskFileItemFactory();
    

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    factory.setSizeThreshold(1024*500);
    

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    File tempDirectory = new File("d:\\tempDirectory");
    

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    factory.setRepository(tempDirectory);
    

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    ServletFileUpload upload = new ServletFileUpload(factory);
    

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    upload.setSizeMax(1024 * 1024 * 5);
    

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    try {
    

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    List<FileItem> items = upload.parseRequest(request);
    

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    for(FileItem item:items){
    

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    if(item.isFormField()){
    

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    String name = item.getFieldName();
    

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    String value = item.getString();
    

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    System.out.println( name + " : " + value);
    

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    }else{
    

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    String fieldName = item.getFieldName();
    

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    String fileName = item.getName();
    

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    String contentType = item.getContentType();
    

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    long sizeInBytes = item.getSize();
    

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    System.out.println(fieldName);
    

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    System.out.println(fileName);
    

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    System.out.println(contentType);
    

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    System.out.println(sizeInBytes);
    

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    //不同的浏览器提交的文件名是不一样的，有些浏览器提交的文件名是带有路径的，如：c:\nihao\a.txt，而有些只是单纯的文件名，如：a.txt
    

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    //处理获取到的上传文件的文件名的路径部分，只保留文件名部分
    

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    fileName = fileName.substring(fileName.lastIndexOf("\\")+1);
    

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    InputStream in = item.getInputStream();
    

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    byte[] buffer = new byte[1024];
    

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    int len = 0;
    

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    fileName = "d:\\files\\" + fileName;
    

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    System.out.println(fileName);
    

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    OutputStream out = new FileOutputStream(fileName);
    

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    while((len = in.read(buffer)) != -1){
    

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    out.write(buffer, 0, len);
    

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    }
    

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    out.close();
    

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    in.close();
    

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    }
    

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    }
    

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    } catch (FileUploadException e) {
    

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    e.printStackTrace();
    

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    }
    

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    }
    

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    }
    

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posted @ 
2019-08-30 16:48 
那些年的代码 
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