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> </td>
<td><input type="submit" name="Submit" value="Submit" />
<input type="reset" name="Submit2" value="Reset" /></td>
</tr>
</table>
</form>
