java上传图片或文件

分手后的思念是犯贱 2021-10-23 12:30 377阅读 0赞

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前端通过form表单用post方式提交文件，后台进行保存处理。此处省略较多注释及其他功能，仅保留上传文件功能，建议阅读原文学习。

前端：

<!DOCTYPE html>
    <html>
    <head>
    <meta name="content-type" content="text/html; charset=UTF-8">
    <title>发布商品</title>
    </head>
    <body>
        <form action="../com/yh/myServlet/AddGoodsServlet"
            enctype="multipart/form-data" method="post">
            上传文件：<input type="file" name="picture"> <br/>
            <input type="submit" value="提交">
        </form>
    </body>
    </html>

后端：

package com.yh.myServlet;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.List;
    import java.util.UUID;
    
    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.disk.DiskFileItemFactory;
    import org.apache.commons.fileupload.servlet.ServletFileUpload;
    
    public class AddGoodsServlet extends HttpServlet {
    
        /**
         * 
         */
        private static final long serialVersionUID = 1L;
    
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            // TODO Auto-generated method stub
        }
    
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
            // TODO Auto-generated method stub
            response.setContentType("text/html;charset=utf-8");
    
            String savePath = this.getServletContext().getRealPath("/WEB-INF/upload");
            savePath = savePath.replace("\\", "\\\\");
            File file = new File(savePath);
            if (!file.exists()) {
                file.mkdir();
            }
            InputStream in = null;
            FileOutputStream out = null;
            try {
                DiskFileItemFactory factory = new DiskFileItemFactory();
                ServletFileUpload upload = new ServletFileUpload(factory);
                upload.setHeaderEncoding("UTF-8");
    
                List<FileItem> list = upload.parseRequest(request);
                for (FileItem item : list) {
                    String filename = item.getName();
                    if (filename == null || filename.trim().equals("")) {
                        continue;
                    }
                    filename = filename.substring(filename.lastIndexOf(".") + 1);
                    filename = UUID.randomUUID().toString() + "." + filename;
                    out = new FileOutputStream(savePath + "\\\\" + filename);
                    byte[] buffer = new byte[1024];
                    int len = 0;
                    in = item.getInputStream();
                    while ((len = in.read(buffer)) > 0) {
                        out.write(buffer, 0, len);
                    }
                    item.delete();
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                in.close();
                out.close();
            }
        }
    }

转载于:https://www.cnblogs.com/YeHuan/p/11265401.html

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