Servlet3.0现实文件上传

发布时间：2020-12-14 23:27:01 所属栏目：Java 来源：网络整理

导读：今天PHP站长网 52php.cn把收集自互联网的代码分享给大家，仅供参考。 html head meta http-equiv="Content-Type" content="text/html; charset=GB18030" title上传图片/title /head body center form action="upload_pic"

以下代码由PHP站长网 52php.cn收集自互联网

现在PHP站长网小编把它分享给大家，仅供参考

    <html>  
    <head>  
    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">  
    <title>上传图片</title>  
    </head>  
    <body>  
    <center>  
      <form action="upload_pic" method="post" enctype="multipart/form-data">  
      文件：<input type="file" name="pic"/><br/>  
      描述：<input type="text" name="des"/><br/>  
      <input type="submit" value="upload"/>  
      </form>  
    </center>  
    </body>  
    </html>

UploadPictureServlet.java

    import java.io.File;  
    import java.io.IOException;  
    import java.io.PrintWriter;  
    import java.util.UUID;  
    import java.util.regex.Matcher;  
    import java.util.regex.Pattern;  
      
    import javax.servlet.ServletException;  
    import javax.servlet.annotation.MultipartConfig;  
    import javax.servlet.annotation.WebServlet;  
    import javax.servlet.http.HttpServlet;  
    import javax.servlet.http.HttpServletRequest;  
    import javax.servlet.http.HttpServletResponse;  
    import javax.servlet.http.Part;  
      
    /** 
     * Servlet implementation class UploadPictureServlet 
     */  
    @MultipartConfig  
    @WebServlet("/upload_pic")  
    public class UploadPictureServlet extends HttpServlet {  
        private static final long serialVersionUID = 1L;  
            
        private String mimes="image/jpeg,image/gif,image/bmp,image/jpg";  
        
        protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {  
            response.setContentType("text/html;charset=gbk");  
            PrintWriter out=response.getWriter();  
              
            out.println("<html><head><title>文件上传</title></head><body>");  
            Part part=request.getPart("pic");  
            System.out.println(part);  
            if(null!=part){  
                String mime=part.getContentType();  
                  
                if(-1==mimes.indexOf(mime.toLowerCase())){  
                    //不是图片  
                    part.delete();  
                      
                      
                    out.println("<script language='javascript'>alert('不是图片')</script>");  
                }else if(1024*1024*2<part.getSize()){  
                    part.delete();  
                    out.println("<script language='javascript'>alert('图片不能超出2M')</script>");  
                }else{  
                    String fileName=getFileName(part);  
                    String extName=getExtName(fileName);  
                    long size=part.getSize();  
                    String contentType=part.getContentType();  
                    String path=this.getServletContext().getRealPath("pics");  
                    String newFileName=UUID.randomUUID().toString()+extName;  
                    //存到服务器  
                    part.write(path+File.separator+newFileName);  
                    out.println("<h1>上传成功!!!!</h1><ul>");  
                    out.println("<li>客户端文件名:"+fileName+"</li>");  
                    out.println("<li>ContentType:"+extName+"</li>");  
                    out.println("<li>长度："+size+"</li>");  
                    out.println("<li>服务器上文件名："+path+File.separator+newFileName+"</li>");  
                    out.println("</ul>");  
                }  
                  
            }  
              
              
            out.println("</body></html>");  
            out.close();  
        }  
        //取得文件扩展名  
        public String getExtName(String fileName){  
            String extName=null;  
            int index=fileName.lastIndexOf(".");  
            if(-1!=index){  
                extName=fileName.substring(index);  
            }  
            return extName;  
              
              
        }  
        //取得文件名  
        public String getFileName(Part part){  
            String fileName=null;  
            String hv=part.getHeader("content-disposition");  
            String pattern="(form-data; name="(.*?)"; filename="(.*?)")";  
            Matcher match=Pattern.compile(pattern).matcher(hv);  
            if(match.find()){  
                fileName=match.group(3);  
            }  
            return fileName;  
        }  
      
    }

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