List items = upload.parseRequest(request);

Question

写javaweb时遇到的，没有用spring和struts框架，就是普通的jsp+servlet,但就是取不到request里表单的值。

Util 类
package util;

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.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;


public class UploadUtil {

    // 上传文件存储目录
    private static final String UPLOAD_DIRECTORY = "upload";


    public void parse(HttpServletRequest request, String saveDir) throws IOException {

    }

    public static HashMap upload(HttpServletRequest request) throws ServletException, IOException {

        // 配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();

        ServletFileUpload upload = new ServletFileUpload(factory);

        //设置多媒体文件参数
        HashMap<String, String> map = new HashMap<String, String>();

        // 构造临时路径来存储上传的文件
        // 这个路径相对当前应用的目录
        String serverpath = request.getServletContext().getRealPath(UPLOAD_DIRECTORY);
        System.out.println(serverpath);

        try {
            System.out.println(request.getParameterMap());
            // 解析请求的内容提取文件数据
            List items = upload.parseRequest(request);
            Iterator iter = items.iterator();// 遍历表单中提交过来的内容
            System.out.println(items.size());
            while (iter.hasNext()) {
                FileItem item = (FileItem) iter.next();
                if (item.isFormField()) { // 如果是表单域 ，就是非文件上传元素
                    String value = item.getString("UTF-8"); // 获取value属性的值，这里需要指明UTF-8格式，否则出现中文乱码问题
                    String name = item.getFieldName();
                    map.put(name, value);
                    System.out.println(map);
                }else {
                    String type = item.getFieldName();
                    String fileName = new File(item.getName()).getName();
                    String filePath = serverpath + fileName;
                    File storeFile = new File(filePath);
                    // 在控制台输出文件的上传路径
                    map.put(type, filePath);
                    System.out.println(map);
                    // 保存文件到硬盘
                    item.write(storeFile);
                }
            }
        } catch (FileUploadException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return map;

    }
}

Controller 类

public String updateEstate(HttpServletRequest req, HttpServletResponse resp) throws SQLException, IOException, ServletException {

    UploadUtil uploadUtil = new UploadUtil();
    HashMap<String,String> map= uploadUtil.upload(req);
    resp.setContentType("text/html;charset=utf-8");
    resp.getWriter().println(map.toString());
    System.out.println(map);

    for(Map.Entry<String,String> entry : map.entrySet()){
        System.out.println("key="+entry.getKey());
        System.out.println("value="+ entry.getValue());
    }

    return null;}

前端html

<form  id= "form1" action="estate?method=updateEstate&eid=${e.id}"  method="post" onsubmit="return checked(this)" enctype="multipart/form-data">
    Edit Estate Information:
    <br><br>
    <table width="100%" border="1" align="center" cellpadding="3" cellspacing="1" bordercolor="#00FFFF" style="border-collapse:collapse">
        <tr><td>Estate ID:</td><td><label name='id' type='text' id='id' >${e.id}</label></td></tr>
        <tr><td>Estate Name:</td><td><input name='name' type='text' id='name' placeholder="${e.name}" /></td></tr>
        <tr><td>Building Number:</td><td><input name='bNumber' type='text' id='bNumber' placeholder="${e.bNumber}" /></td></tr>
        <tr><td>Room Number:</td><td><input name='rNumber' type='text' id='rNumber' placeholder="${e.rNumber}" /></td></tr>
        <tr><td>Room Type</td><td><input name='rType' type='text' id='rType' placeholder="${e.rType}" /></td></tr>
        <tr><td>Address:</td><td><input name='address' type='text' id='address' placeholder="${e.address}"/></td></tr>
        <tr><td>Area:</td><td><input name='area' type='text' id='area' placeholder="${e.area}" /></td></tr>
        <tr><td>Decoration:</td><td><select name="decoration" id="decoration" >
            <option value="hardcover">Hardcover</option>
            <option value="standard">Standard</option>
            <option value="none">None</option></select></td></tr>
        <tr><td>SalesType:</td><td><select name="type" id="type" >
            <option value="new">new</option>
            <option value="secondhand">secondhand</option>
            <option value="forRent">rent</option></select></td></tr>
        <tr><td>Price:</td><td><input name='price' type='text' id='price' placeholder="${e.price}" /></td></tr>
        <tr><td>Salesman:</td><td><label name='salesman' type='text' id='salesman' value="${user.username}">${user.username}</label></td></tr>
        <tr><td>Detail:</td><td><input name='detail' type='text' id='detail' placeholder=""/></td></tr>
        <tr><td>State:</td><td><select name="state" id="state" >
            <option value="forSale">forSale</option>
            <option value="forRent">forRent</option>
            <option value="forRent">Sold</option></select></td></tr>
        <tr><td>Image:</td><td><input type="file" id="image" name="image" multiple="multiple"/></td></tr>
        <tr><td>Structure Image:</td><td><input type="file" id="sImage" name="sImage" multiple="multiple"/></td></tr>
        <tr><td>Detailed Image:</td><td><input type="file" id="dImage" name="dImage" multiple="multiple"/></td></tr>
        <tr>
            <td>&nbsp;</td>
            <td><input type="submit" name="Submit" value="Submit"  />
                <input type="reset" name="Submit2" value="Reset" /></td>
        </tr>
    </table>
</form>

Answer 1

你这代码不像是jsp+servlet技术实现的程序呀，servlet都没有看到呢，上传文件有内置的Part就可以了。