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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Upload Page 00</title>
</head>
<body>
<h3 style="color:red">${message }</h3>
<form action="uploadServlet00" method="post" enctype="multipart/form-data">
File:<input type="file" name="file"/><br />
Desc:<input type="text" name="desc"/><br />
<input type="submit" value="Submit"/>
</form>
</body>
</html>
package com.abc.upload.servlet;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
@WebServlet("/uploadServlet00")
public class UploadServlet00 extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
// Set factory constraints
factory.setSizeThreshold(1024 * 500);
ServletContext servletContext = this.getServletConfig().getServletContext();
// 临时文件夹设置为Tomcat 的work 目录,最终文件也保存到那里。
File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");
factory.setRepository(repository);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// 设置单个文件的大小,这里设置单个文件不超过1MB
upload.setFileSizeMax(1024 * 1024);
// Set overall request size constraint
// 设置文件上传的总大小,这里设置为5MB
upload.setSizeMax(1024 * 1024 * 5);
try {
// Parse the request
// 解析客户端请求
List<FileItem> items = upload.parseRequest(request);
// Process the uploaded items
Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) {
FileItem item = iter.next();
// 判断是普通域还是文件域,交由不同方法处理
if (item.isFormField()) {
processFormField(item);
} else {
processUploadedFile(item);
}
}
request.setAttribute("message", "Upload successfully!");
} catch (Exception e) {
e.printStackTrace();
request.setAttribute("message", e.getMessage());
}
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
private void processFormField(FileItem item) {
// Process a regular form field
if (item.isFormField()) {
String name = item.getFieldName();
String value = item.getString();
System.out.println(name + ": " + value);
}
}
private void processUploadedFile(FileItem item) throws Exception {
// Process a file upload
if (!item.isFormField()) {
String fieldName = item.getFieldName();
String fileName = item.getName();
String contentType = item.getContentType();
long sizeInBytes = item.getSize();
System.out.println(fieldName);
System.out.println(fileName);
System.out.println(contentType);
System.out.println(sizeInBytes);
fileName = this.getServletContext().getAttribute("javax.servlet.context.tempdir") + "/" + fileName;
item.write(new File(fileName));
}
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>INDEX PAGE</title>
</head>
<body>
<center>
<h3 style="color:red">${message }</h3>
<form action="<%=request.getContextPath() %>/fileServlet" method="post" enctype="multipart/form-data">
File: <input type="file" name="age" /><br />
<input type="submit" value="Send" />
</form>
</center>
</body>
</html>
package com.abc.servlet;
import java.io.IOException;
import java.io.InputStream;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/fileServlet")
public class FileServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
InputStream in = request.getInputStream();
byte[] buffer = new byte[1024];
int length = 0;
int limit = 50 * 1024 * 1024;
while ((length = in.read(buffer)) != -1) {
limit -= length;
if (limit <= 0) {
throw new Exception("The file is too big.");
}
}
request.setAttribute("message", request.getContentLength() + " Successful!");
} catch (Exception e) {
e.printStackTrace();
request.setAttribute("message", e.getMessage());
}
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
}