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javaWEB文件上传

程序员文章站 2022-05-08 17:02:25
...

Servlet

package top.biglin;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.IOUtils;

public class FileuploadServlet2 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest
     * , javax.servlet.http.HttpServletResponse)
     */
    @SuppressWarnings("unchecked")
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        // 接收上传的文件
        // 1、创建磁盘文件项工厂
        String path2 = this.getServletContext().getRealPath("temp");
        DiskFileItemFactory factory = new DiskFileItemFactory(1024 * 1024,
                new File(path2));
        // 2、创建文件上传的核心类
        ServletFileUpload upload = new ServletFileUpload(factory);
        upload.setHeaderEncoding("utf-8");// 解决文件名称乱码
        // 判断是否为文件上传表单
        boolean isMutilpartContent = ServletFileUpload.isMultipartContent(request);
        if (isMutilpartContent) {
            // 分解表单
            List<FileItem> parseRequest = null;
            try {
                parseRequest = upload.parseRequest(request);
            } catch (FileUploadException e) {
                e.printStackTrace();
            }

            if (parseRequest != null) {
                for (FileItem item : parseRequest) {
                    boolean isFormField = item.isFormField();
                    if (isFormField) {
                        String fieldName = item.getFieldName();
                        String value = item.getString("UTF-8");
                        System.out.println(fieldName + "：" + value);
                    } else {// 表示为文件项
                        String fileName = item.getName();
                        InputStream in = item.getInputStream();
                        String path = this.getServletContext().getRealPath("upload");
                        OutputStream out = new FileOutputStream(path+"/"+fileName);
                        //IOUtils ioUtils = new IOUtils();
                        IOUtils.copy(in, out);
                        in.close();
                        out.close();
                        
                        //删除临时文件
                        item.delete();
                    }
                }
            }
        } else {
            // 使用request.getParameter()获取参数
        }
        // 5、判断普通项
        doGet(request, response);
    }
}

jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件上传</title>
</head>
<body>
    <div>
        <form  enctype="multipart/form-data" action="/testfileupload/upload2" method="post">
            <p>用户名：<input type="text" name="username" value="" /></p>
            <input type="file" name="fileupload" value="dddd" />
            <p><input type="submit" name="fileUpload"
                value="a上传" /></p>
        </form>
    </div>
</body>
</html>

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