java 网页 保存上传文件
网页请求提交到另外一个jsp 进行处理
- index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'fileupload.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head> <body>
<!-- enctype 默认是 application/x-www-form-urlencoded -->
<form action="AccepteUploadFile.jsp" enctype="multipart/form-data" method="post">
上传文件: <input
type="file" name="file1"><br /> <input type="submit"
value="提交" />
</form>
</body>
</html>
- AccepteUploadFile.jsp
<%@ page contentType="text/html; charset=gb2312" language="java"
import="java.sql.*" errorPage=""%>
<%@ page import="java.io.*"%>
<%!public String codeToString(String str)
{
String s = str;
try
{
byte tempB[] = s.getBytes("ISO-8859-1");
s = new String(tempB);
return s;
}
catch (Exception e)
{
return s;
}
}%>
<%
String tempFileName = new String("tempFileName1");//接收上传的文件内容的临时文件的文件名
File tempFile1 = new File("f:/", tempFileName);
FileOutputStream outputFile1 = new FileOutputStream(tempFile1);
InputStream fileSource1 = request.getInputStream();//得到客户端提交的所有数据
byte b[] = new byte[1000];
int n;
while ((n = fileSource1.read(b)) != -1)
{
outputFile1.write(b, 0, n); //将得到的客户端数据写入临时文件
}
outputFile1.close();
fileSource1.close();
out.println("tempfile finish <br/>");
RandomAccessFile randomFile1 = new RandomAccessFile(tempFile1, "r"); String firstline = randomFile1.readLine();//读取第一行数据
out.println("firstline:" + firstline+"<br/>");
String FilePath = randomFile1.readLine();//读取第二行数据,这行数据包括了文件的路径和文件名
int position = FilePath.lastIndexOf('\\'); //文件名
String filename = codeToString(FilePath.substring(position + 1,
FilePath.length() - 1));
out.println("FilePath:" + FilePath+"<br/>");
randomFile1.seek(0);//重新定位指针到文件头
long forthEnterPosition = 0;
int forth = 1; //得到第4行回车符号的位置,这是上传文件的开始位置
while ((n = randomFile1.readByte()) != -1 && (forth <= 4))
if (n == '\n')
{
forthEnterPosition = randomFile1.getFilePointer();
forth++;
} File saveFile1 = new File("f:/", filename);
RandomAccessFile randomFile2 = new RandomAccessFile(saveFile1, "rw");
randomFile1.seek(randomFile1.length());
long endPosition = randomFile1.getFilePointer();//找到上传的文件数据的结束位置,即倒数第4行
int j = 1;
while ((endPosition >= 0) && (j <= 4))
{
endPosition--;
randomFile1.seek(endPosition);
if (randomFile1.readByte() == '\n')
j++;
}
randomFile1.seek(forthEnterPosition);
long startPoint = randomFile1.getFilePointer();
while (startPoint < endPosition - 1)
{
randomFile2.write(randomFile1.readByte());
startPoint = randomFile1.getFilePointer();
}
randomFile2.close();
randomFile1.close();
//tempFile1.delete();
out.print("file:" + filename + " succeed upload!<br/>");
response.getWriter().write("hello");
%>
网页请求提交到 servlet 进行处理
- index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'fileupload.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head> <body>
<!-- enctype 默认是 application/x-www-form-urlencoded -->
<form action="servlet/fileServlet" enctype="multipart/form-data" method="post">
文件类型: <input type="text" name="filetype"><br />
上传文件: <input type="file" name="file1"><br /> <input type="submit" value="提交" />
</form> </body>
</html>
- FileProgressServlet
package com; import java.io.*;
import java.sql.Date;
import java.text.SimpleDateFormat;
import java.util.Iterator;
import java.util.List;
import java.util.Random; import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
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; /*
* servlet 保存上传文件
*/
public class FileProgressServlet extends HttpServlet
{ private static final long serialVersionUID = -7744625344830285257L;
private ServletContext sc;
private String savePath; public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
doPost(request, response);
} public void init(ServletConfig config)
{
// 在web.xml中设置的一个初始化参数
savePath = config.getInitParameter("savePath");
sc = config.getServletContext();
System.out.println("servler init");
} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
request.setCharacterEncoding("UTF-8");
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
try
{
String type = "";
String path = ""; List<FileItem> items = upload.parseRequest(request);
Iterator<FileItem> itr = items.iterator();
while (itr.hasNext())
{
FileItem item = (FileItem) itr.next();
if (item.isFormField())
{
System.out.println("表单参数名:" + item.getFieldName()
+ ",表单参数值:" + item.getString("UTF-8"));
type = item.getString("UTF-8");
}
else
{
path = getdir(type);
if (path == "")
{
request.setAttribute("upload.message", "getpath error");
}
if (item.getName() != null && !item.getName().equals(""))
{
System.out.println("上传文件的大小:" + item.getSize());
System.out.println("上传文件的类型:" + item.getContentType());
System.out.println("上传文件的名称:" + item.getName()); File tempFile = new File(item.getName());
Integer rdm = new Random().nextInt();
File file = new File(path, getDataTimeString(true) +rdm.toString()+tempFile.getName().substring(tempFile.getName().indexOf('.')));
item.write(file);
System.out.println("保存的上传文件:" + file.getPath());
request.setAttribute("upload.message", "上传文件成功!");
}
else
{
request.setAttribute("upload.message", "没有选择上传文件!");
}
}
}
}
catch (FileUploadException e)
{
e.printStackTrace();
System.out.println(e.getMessage());
}
catch (Exception e)
{
e.printStackTrace();
System.out.println(e.getMessage());
}
request.getRequestDispatcher("/t2.jsp").forward(request, response);
} private String getdir(String filetype)
{
if (filetype == null)
{
return "";
}
String path = "F:\\youme\\{0}\\" + getDataString() + "\\";
switch (filetype)
{
case "":
path = path.replace("{0}", "image");
break;
case "":
path = path.replace("{0}", "vedio");
break;
default:
return "";
}
try
{
java.io.File file = new java.io.File(path);
if (!file.exists())
{
if (!file.mkdirs())
{
return "";
}
}
return path;
}
catch (Exception ex)
{
return "";
}
finally
{ }
} /*
* 获取当前时间
*/
private static String getDataTimeString(Boolean isfilename)
{
try
{
SimpleDateFormat formatter = null;
if (!isfilename)
{
formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
}
else
{
formatter = new SimpleDateFormat("yyyyMMddHHmmss");
}
Date curDate = new Date(System.currentTimeMillis());// 获取当前时间
return formatter.format(curDate);
}
catch (Exception ex)
{
System.out.println(ex.getMessage());
return "";
}
} /*
* 获取当前日期
*/
private static String getDataString()
{
try
{
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
Date curDate = new Date(System.currentTimeMillis());// 获取当前时间
return formatter.format(curDate);
}
catch (Exception ex)
{
System.out.println(ex.getMessage());
return "";
}
}
}注意:这里用了组件commons-fileupload-1.3.jar进行文件操作
- web.xml配置一下servlet(index.jsp提交路径)
<servlet>
<description>This is the description </description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>FileProgressServlet</servlet-name>
<servlet-class>com.FileProgressServlet</servlet-class> <init-param>
<param-name>savePath</param-name>
<param-value>uploads</param-value>
</init-param>
</servlet> <servlet-mapping>
<servlet-name>FileProgressServlet</servlet-name>
<url-pattern>/servlet/fileServlet</url-pattern>
</servlet-mapping>
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