JavaServlet多文件上传变体
有人能帮我设计一个Java Servlet,它可以上传这种变体中的文件,或者告诉我如何上传文件: 5个文件输入类型字段,但仅填写其中的1或2个(在任何文件字段中),然后上载这些文件的数量 我发现问题在于: 1) 如果我填写的文件字段不是第一个字段,那么它将不会上载我的文件。 e、 g.我填写第三个文件字段,然后单击上载。该文件将不会上载。但是如果我填写第一个,它就会被上传。如果我填写任何2-3个字段也是一样,但是如果我没有按顺序(1,2,3…)填写,它们将不会被上传 2) 我在文件字段下面有一个单选按钮。如果我没有填写所有的文件字段,servlet将不会读取单选按钮值。有人能告诉我为什么会这样吗 总之,如果且仅当我填写所有5个文件字段并勾选其中一个单选按钮时,它才有效 HTML代码:JavaServlet多文件上传变体,java,servlets,file-upload,Java,Servlets,File Upload,有人能帮我设计一个Java Servlet,它可以上传这种变体中的文件,或者告诉我如何上传文件: 5个文件输入类型字段,但仅填写其中的1或2个(在任何文件字段中),然后上载这些文件的数量 我发现问题在于: 1) 如果我填写的文件字段不是第一个字段,那么它将不会上载我的文件。 e、 g.我填写第三个文件字段,然后单击上载。该文件将不会上载。但是如果我填写第一个,它就会被上传。如果我填写任何2-3个字段也是一样,但是如果我没有按顺序(1,2,3…)填写,它们将不会被上传 2) 我在文件字段下面有一个
<html>
<head>
<title>File Uploading Form</title>
</head>
<body>
<h3>Energy Efficient Color Mapping Texture Transformer</h3>
Select 5 images to upload: <br />
<form action="UploadServlet" method="post"
enctype="multipart/form-data">
<b>Image 1</b>
<input type="file" name="file1" size="50" />
<br />
<b>Image 2</b>
<input type="file" name="file2" size="50" />
<br />
<b>Image 3</b>
<input type="file" name="file3" size="50" />
<br />
<b>Image 4</b>
<input type="file" name="file4" size="50" />
<br />
<b>Image 5</b>
<input type="file" name="file5" size="50" />
<br /><br />
Select conversion scheme below: <br />
<input type="radio" name="scheme" value="1" /> Sat 25 Hue 9 <br />
<input type="radio" name="scheme" value="2" /> Sat 25 Hue 24 <br />
<input type="radio" name="scheme" value="3" /> Sat 25 Hue 36 <br />
<input type="radio" name="scheme" value="4" /> Sat 50 Hue 9 <br />
<input type="radio" name="scheme" value="5" /> Sat 70 Hue 9 <br />
<input type="radio" name="scheme" value="6" /> Sat 50 Hue 24 <br />
<input type="radio" name="scheme" value="7" /> Sat 70 Hue 36
<br /><br />
<input type="submit" value="Upload File" />
</form>
</body>
</html>
文件上载表格
节能的颜色映射纹理变换器
选择5个要上载的图像:
图1
图2
图3
图4
图5
选择下面的转换方案:
Sat 25色调9
Sat 25色调24
Sat 25-36
Sat 50色调9
Sat 70色调9
Sat 50色调24
Sat 70-36
比如说,我只想填写图片3和4,然后上传这两张图片。
servlet:
// Import required java libraries
import java.io.*;
import java.util.*;
import javax.servlet.ServletConfig;
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.output.*;
public class UploadServlet extends HttpServlet {
private boolean isMultipart;
private String filePath;
private int maxFileSize = 5*1024*1024;
private int maxMemSize = 4 * 1024*1024;
private File file ;
public void init( ){
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
// Check that we have a file upload request
isMultipart = ServletFileUpload.isMultipartContent(request);
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter( );
if( !isMultipart ){
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>No file uploaded</p>");
out.println("</body>");
out.println("</html>");
return;
}
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);
// Location to save data that is larger than maxMemSize.
factory.setRepository(new File("c:\\temp"));
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax( maxFileSize );
try{
// Parse the request to get file items.
List fileItems = upload.parseRequest(request);
// Process the uploaded file items
Iterator i = fileItems.iterator();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
// Get the file location where it would be stored.
filePath =
getServletContext().getInitParameter("file-upload");
//Create calendar for folder naming purpose
GregorianCalendar gcalendar = new GregorianCalendar();
String date=String.valueOf(gcalendar.get(Calendar.DATE));
String month=String.valueOf(gcalendar.get(Calendar.MONTH)+1);
String year=String.valueOf(gcalendar.get(Calendar.YEAR));
String hour=String.valueOf(gcalendar.get(Calendar.HOUR));
String minute=String.valueOf(gcalendar.get(Calendar.MINUTE));
String second=String.valueOf(gcalendar.get(Calendar.SECOND));
//create a new filepath
filePath= filePath + date+"-"+month+"-"+year+"_"+hour+minute+second;
boolean newfolder= (new File(filePath)).mkdirs();
if (newfolder){
System.out.println("Created new folder");
}
while ( i.hasNext () )
{
FileItem fi = (FileItem)i.next();
if ( fi.isFormField() )
{
out.println("is a form field <br>");
String fieldName = fi.getFieldName();
String fieldValue = fi.getString();
out.println(fieldName+": "+fieldValue);
}
else
//if ( !fi.isFormField () )
{
// Get the uploaded file parameters
String fieldName = fi.getFieldName();
String fileName = fi.getName();
String contentType = fi.getContentType();
boolean isInMemory = fi.isInMemory();
long sizeInBytes = fi.getSize();
// Write the file
if( fileName.lastIndexOf("\\") >= 0 ){
file = new File( filePath + "\\" +
fileName.substring( fileName.lastIndexOf("\\"))) ;
}else{
file = new File( filePath + "\\" +
fileName.substring(fileName.lastIndexOf("\\")+1)) ;
}
fi.write( file ) ;
out.println("Uploaded Filename: " + fileName + "<br>");
}
}
out.println("</body>");
out.println("</html>");
}catch(Exception ex) {
System.out.println(ex);
}
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, java.io.IOException {
throw new ServletException("GET method used with " +
getClass( ).getName( )+": POST method required.");
}
}
//导入所需的java库
导入java.io.*;
导入java.util.*;
导入javax.servlet.ServletConfig;
导入javax.servlet.ServletException;
导入javax.servlet.http.HttpServlet;
导入javax.servlet.http.HttpServletRequest;
导入javax.servlet.http.HttpServletResponse;
导入org.apache.commons.fileupload.FileItem;
导入org.apache.commons.fileupload.FileUploadException;
导入org.apache.commons.fileupload.disk.DiskFileItemFactory;
导入org.apache.commons.fileupload.servlet.ServletFileUpload;
导入org.apache.commons.io.output.*;
公共类UploadServlet扩展了HttpServlet{
私有布尔是多重的;
私有字符串文件路径;
private int maxFileSize=5*1024*1024;
私有int maxmesize=4*1024*1024;
私有文件;
公共void init(){
}
public void doPost(HttpServletRequest请求,
HttpServletResponse(响应)
抛出ServletException,java.io.IOException{
//检查我们是否有文件上传请求
isMultipart=ServletFileUpload.isMultipartContent(请求);
response.setContentType(“text/html”);
java.io.PrintWriter out=response.getWriter();
如果(!isMultipart){
out.println(“”);
out.println(“”);
out.println(“Servlet上传”);
out.println(“”);
out.println(“”);
out.println(“没有上传文件””;
out.println(“”);
out.println(“”);
回来
}
DiskFileItemFactory=新的DiskFileItemFactory();
//将存储在内存中的最大大小
factory.setSizeThreshold(maxMemSize);
//保存大于maxMemSize的数据的位置。
setRepository(新文件(“c:\\temp”);
//创建新的文件上载处理程序
ServletFileUpload upload=新的ServletFileUpload(工厂);
//要上载的最大文件大小。
upload.setSizeMax(maxFileSize);
试试{
//解析请求以获取文件项。
List fileItems=upload.parseRequest(请求);
//处理上载的文件项
迭代器i=fileItems.Iterator();
out.println(“”);
out.println(“”);
out.println(“Servlet上传”);
out.println(“”);
out.println(“”);
//获取文件存储位置。
文件路径=
getServletContext().getInitParameter(“文件上载”);
//创建用于文件夹命名的日历
GregorianCalendar gcalendar=新的GregorianCalendar();
String date=String.valueOf(gcalendar.get(Calendar.date));
String month=String.valueOf(gcalendar.get(Calendar.month)+1);
String year=String.valueOf(gcalendar.get(Calendar.year));
String hour=String.valueOf(gcalendar.get(Calendar.hour));
String minute=String.valueOf(gcalendar.get(Calendar.minute));
stringsecond=String.valueOf(gcalendar.get(Calendar.second));
//创建一个新的文件路径
文件路径=文件路径+日期+“-”+月份+“-”+年+““+小时+分钟+秒;
布尔值newfolder=(新文件(文件路径)).mkdirs();
如果(新建文件夹){
System.out.println(“创建的新文件夹”);
}
而(i.hasNext())
{
FileItem fi=(FileItem)i.next();
if(fi.isFormField())
{
out.println(“是一个表单字段
”;
字符串fieldName=fi.getFieldName();
String fieldValue=fi.getString();
out.println(fieldName+“:”+fieldValue);
}
其他的
//如果(!fi.isFormField())
{
//获取上传的文件参数
字符串fieldName=fi.getFieldName();
字符串文件名=fi.getName();
字符串contentType=fi.getContentType();
布尔值isInMemory=fi.isInMemory();
long-sizeInBytes=fi.getSize();
//写文件
如果(fileName.lastIndexOf(“\\”>)=0){
文件=新文件(文件路径+“\\”+
fileName.substring(fileName.lastIndexOf(“\\”);
}否则{
文件=新文件(文件路径+“\\”+
fileName.substring(fileName.lastIndexOf(“\\”+1));
}
fi.写入(文件);
out.println(“上传的文件名:“+Filename+”
”;
}
}
out.println(“”);
out.println(“”);
}捕获(例外情况除外){
系统输出打印项次(ex);
}
}
公共无效数据集(HttpServletRequest请求,
HttpServletResponse(响应)
抛出ServletException,java.io.IOException{
抛出新的ServletException(“GET方法用于”+
getClass().getName()+“:需要POST方法。”);
}
}
到目前为止,当我使用JavaServlet搜索多个文件上传时,我还没有看到任何不同的变化 好的,所以当以下任何一个
if( fileName.equals("")){
continue;
}