文件上传之Servlet
导包 commons-fileupload-1.3.1.jar commons-io-2.2.jar
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
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;
public class UploadHandleServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String savePath=this.getServletContext().getRealPath("/WEB-INF/upload/");
File file=new File(savePath);
if(!file.exists()&&!file.isDirectory()){
System.out.println(savePath+"目录不存在，需要创建");
//创建目录
file.mkdirs();
}
//消息提示
String message="";
//创建DiskFileItemFactory工厂
DiskFileItemFactory factory=new DiskFileItemFactory();
//创建一个文件上传解析器
ServletFileUpload upload=new ServletFileUpload(factory);
//解决文件上传乱码问题
upload.setHeaderEncoding("UTF-8");
if(!ServletFileUpload.isMultipartContent(request)){
//按照传统方面获取数据
return;
}
try {
//使用ServletFileUpload解析器解析数据，返回来的是一个List<FileItem>集合,每一个FileItem对应一个表单输出
List<FileItem> list=upload.parseRequest(request);
for (FileItem item : list) {
if(item.isFormField()){
String name=item.getFieldName();
String value=item.getString("UTF-8");
System.out.println(name+"="+value);
}else{
String filename=item.getName();
System.out.println(filename);
if(filename==null||filename.trim().equals("")){
continue;
}
//处理获取到的上传文件的文件名的路径部分，只保留文件名部分
filename=filename.substring(filename.lastIndexOf("\\")+1);
//获取item文件上传输入流
InputStream in=item.getInputStream();
//创建一个文件输出流
FileOutputStream out=new FileOutputStream(savePath+"\\"+filename);
byte[] buffer=new byte[1024];
int len=0;
while((len=in.read(buffer))>0){
out.write(buffer,0,len);
}
in.close();
out.close();
item.delete();
message="文件上传成功";
}
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
request.setAttribute("message", message);
request.getRequestDispatcher("/message.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
jsp页面
<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>
<title>文件上传</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/UploadHandleServlet" enctype="multipart/form-data" method="post">
上传用户：<input type="text" name="username"><br/>
上传文件1：<input type="file" name="file1"><br/>
<input type="submit" value="提交">
</form>
</body>
</html>
<%@ 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>成功页面</title> </head> <body> ${message} </body> </html>
