Java文件上传

最新推荐文章于 2024-05-22 13:46:49 发布

原创最新推荐文章于 2024-05-22 13:46:49 发布 · 162 阅读

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CC 4.0 BY-SA版权

本文介绍了一个使用Java Servlet实现的文件上传示例，通过commons-fileupload库解析multipart表单数据，将文件保存到服务器指定目录。

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导入包commons-fileupload-1.3.1.jar和commons-io-2.4.jar
Upload.jsp

在这里插入代码片
``<body>
<form action="${pageContext.request.contextPath}/UploadServlet" method="post" enctype="multipart/form-data">
    <table>
        <tr>
            <td>
              用户名：<input type="text" name="name">
            </td>
        </tr> <tr>
            <td>
               文件1：<input type="file" name="file">
            </td>
        </tr> <tr>
            <td>
                文件2：<input type="file" name="file1">
            </td>
        </tr>
        <tr>
            <td><input type="submit" value="提交"></td>
        </tr>
    </table>
</form>
</body>`
UploadServlet,java

在这里插入代码片


import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;

@WebServlet("/UploadServlet")
public class UploadServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
              request.setCharacterEncoding("utf-8");
              String savapath=this.getServletContext().getRealPath("/WEB-INF/upload");
              File file=new File(savapath);
              if (!file.exists()&&!file.isDirectory()){
                  file.mkdir();

              }
              String msg="";
        System.out.println(savapath);
        DiskFileItemFactory factory=new DiskFileItemFactory();
        ServletFileUpload upload=new ServletFileUpload(factory);
        if (!ServletFileUpload.isMultipartContent(request)){
            return;
        }
        try {
            List<FileItem> list=upload.parseRequest(request);
            for (FileItem fileItem : list) {
                if (fileItem.isFormField()){
                    String name=fileItem.getFieldName();
                }else {
                    String name=fileItem.getName();
                    System.out.println(name);
                    if (name==null||"".equals(name)){
                        continue;
                    }
                    name=name.substring(name.lastIndexOf("\\")+1);
                    InputStream is=fileItem.getInputStream();
                    FileOutputStream out=new FileOutputStream(savapath+"\\"+name);
                    byte[]buffer=new byte[1024];
                    int length=0;
                    while ((length=is.read(buffer))>0){
                        out.write(buffer,0,length);
                    }
                    is.close();
                    out.close();
                }

            }
        } catch (Exception e) {
           msg="文件上传失败";
           request.setAttribute("msg",msg);
           request.getRequestDispatcher("message.jsp").forward(request,response);
        }
        msg="文件上传成功";
        request.setAttribute("msg",msg);
        request.getRequestDispatcher("message.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            this.doPost(request,response);
    }
}
测试结果

在这里插入图片描述
存储数据结果