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前端通过form表单用post方式提交文件，后台进行保存处理。此处省略较多注释及其他功能，仅保留上传文件功能，建议阅读原文学习。
前端：
<!DOCTYPE html>
<html>
<head>
<meta name="content-type" content="text/html; charset=UTF-8">
<title>发布商品</title>
</head>
<body>
<form action="../com/yh/myServlet/AddGoodsServlet"
enctype="multipart/form-data" method="post">
上传文件：<input type="file" name="picture"> <br/>
<input type="submit" value="提交">
</form>
</body>
</html>
后端：
package com.yh.myServlet;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class AddGoodsServlet extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=utf-8");
String savePath = this.getServletContext().getRealPath("/WEB-INF/upload");
savePath = savePath.replace("\\", "\\\\");
File file = new File(savePath);
if (!file.exists()) {
file.mkdir();
}
InputStream in = null;
FileOutputStream out = null;
try {
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("UTF-8");
List<FileItem> list = upload.parseRequest(request);
for (FileItem item : list) {
String filename = item.getName();
if (filename == null || filename.trim().equals("")) {
continue;
}
filename = filename.substring(filename.lastIndexOf(".") + 1);
filename = UUID.randomUUID().toString() + "." + filename;
out = new FileOutputStream(savePath + "\\" + filename);
byte[] buffer = new byte[1024];
int len = 0;
in = item.getInputStream();
while ((len = in.read(buffer)) > 0) {
out.write(buffer, 0, len);
}
item.delete();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
in.close();
out.close();
}
}
}