java Servlet图像上载无法获取其他表单字段
我的图像上传代码有问题。当我试图从表单中使用request.getParameter("title")
时,上载没有成功。但是当我删除request.getParameter("title")
时,它就工作了
简而言之,如何访问其他表单字段?我想把他们的价值储存在某个地方
这是我的表格:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Upload</title>
</head>
<body>
<div>
<form action="ImageUpload" method="POST" enctype="multipart/form-data"><br>
Title:<input type="text" name="title" id="title" /><br>
Reporter:<input type="text" name="reporter" id="reporter"><br>
Image:<input type="file" name="image" id="image" /><br>
<input type="submit" value="Upload">
</form>
</div>
</body>
</html>
上传Servlet:
package socialnewsreloaded.upload;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tomcat.util.http.fileupload.FileItemIterator;
import org.apache.tomcat.util.http.fileupload.FileItemStream;
import org.apache.tomcat.util.http.fileupload.FileUploadException;
import org.apache.tomcat.util.http.fileupload.servlet.*;
/**
* Servlet implementation class ImageUpload
*/
@WebServlet("/ImageUpload")
@MultipartConfig
public class ImageUpload extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
boolean isMultiPart = ServletFileUpload.isMultipartContent(request);
String title = request.getParameter("title");
response.getWriter().print(title);
if (isMultiPart) {
ServletFileUpload upload = new ServletFileUpload();
try {
FileItemIterator iterate = upload.getItemIterator(request);
while (iterate.hasNext()) {
FileItemStream item = iterate.next();
if (item.isFormField()) {
String fieldName = item.getFieldName();
InputStream inStream = item.openStream();
byte[] b = new byte[inStream.available()];
inStream.read(b);
String value = new String(b);
//response.getWriter().print(fieldName+":"+value);
} else {
String path = "C:/uploads";
if (FileUpload.processFile(path, item)) {
response.getWriter().print(
"File Uploaded Successfully");
} else {
response.getWriter().print(
"Error Uploading File !!");
}
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}
}
}
文件上传类:
package socialnewsreloaded.upload;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.tomcat.util.http.fileupload.FileItemStream;
public class FileUpload {
public static boolean processFile(String path, FileItemStream stream)
throws IOException {
File file = new File(path + File.separator + "images");
if (!file.exists()) {
file.mkdir();
}
File savedFile = new File(file.getAbsolutePath() + File.separator
+ stream.getName());
try {
FileOutputStream outStream = new FileOutputStream(savedFile);
InputStream inStream = stream.openStream();
int i = 0;
byte[] b = new byte[1024];
while((i=inStream.read(b))!=-1){
outStream.write(b, 0, i);
}
outStream.flush();
outStream.close();
return true;
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return false;
}
}
# 1 楼答案
这是打印,而不是
getParameter("title").
在消耗所有输入之前,不应该产生任何输出