JAVAWEB文件上传
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对于文件上传，浏览器在上传的过程中是将文件以流的形式提交到服务器端的，如果直接使用Servlet获取上传文件的输入流然后再解析里面的请求参数是比较麻烦，所以一般选择采用apache的开源工具common-fileupload这个文件上传组件。这个common-fileupload上传组件的jar包可以去apache官网上面下载，也可以在struts的lib文件夹下面找到，struts上传的功能就是基于这个实现的。common-fileupload是依赖于common-io这个包的，所以还需要下载这个包。
<The rest of contents | 余下全文>
UploadHandleServlet的代码如下：
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| package me.gacl.web.controller;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.UUID;
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.FileUploadBase;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class UploadHandleServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String savePath = this.getServletContext().getRealPath("/WEB-INF/upload");
String tempPath = this.getServletContext().getRealPath("/WEB-INF/temp");
File tmpFile = new File(tempPath);
if (!tmpFile.exists()) {
tmpFile.mkdir();
}
String message = "";
try{
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(1024*100);
factory.setRepository(tmpFile);
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setProgressListener(new ProgressListener(){
public void update(long pBytesRead, long pContentLength, int arg2) {
System.out.println("文件大小为：" + pContentLength + ",当前已处理：" + pBytesRead);
}
});
upload.setHeaderEncoding("UTF-8");
if(!ServletFileUpload.isMultipartContent(request)){
return;
}
upload.setFileSizeMax(1024*1024);
upload.setSizeMax(1024*1024*10);
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;
}
filename = filename.substring(filename.lastIndexOf("\\")+1);
String fileExtName = filename.substring(filename.lastIndexOf(".")+1);
System.out.println("上传的文件的扩展名是："+fileExtName);
InputStream in = item.getInputStream();
String saveFilename = makeFileName(filename);
String realSavePath = makePath(saveFilename, savePath);
FileOutputStream out = new FileOutputStream(realSavePath + "\\" + saveFilename);
byte buffer[] = new byte[1024];
int len = 0;
while((len=in.read(buffer))>0){
out.write(buffer, 0, len);
}
in.close();
out.close();
message = "文件上传成功！";
}
}
}catch (FileUploadBase.FileSizeLimitExceededException e) {
e.printStackTrace();
request.setAttribute("message", "单个文件超出最大值！！！");
request.getRequestDispatcher("/message.jsp").forward(request, response);
return;
}catch (FileUploadBase.SizeLimitExceededException e) {
e.printStackTrace();
request.setAttribute("message", "上传文件的总的大小超出限制的最大值！！！");
request.getRequestDispatcher("/message.jsp").forward(request, response);
return;
}catch (Exception e) {
message= "文件上传失败！";
e.printStackTrace();
}
request.setAttribute("message",message);
request.getRequestDispatcher("/message.jsp").forward(request, response);
}
private String makeFileName(String filename){
return UUID.randomUUID().toString() + "_" + filename;
}
private String makePath(String filename,String savePath){
int hashcode = filename.hashCode();
int dir1 = hashcode&0xf;
int dir2 = (hashcode&0xf0)>>4;
String dir = savePath + "\\" + dir1 + "\\" + dir2;
File file = new File(dir);
if(!file.exists()){
file.mkdirs();
}
return dir;
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
|
upload.jsp页面的代码如下：
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| <%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML>
<html>
<head>
<title>文件上传</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/servlet/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/>
上传文件2：<input type="file" name="file2"><br/>
<input type="submit" value="提交">
</form>
</body>
</html>
|
