1、文件上传的步骤:
(1) 需要写一个文件上传表单
(2) 编写服务器端的代码用于接收上传的文件
2、文件上传的内容:
(1) 需要的jar包
jar包百度云连接:https://pan.baidu.com/s/1t9bVJmxBeeiXgmrvDiOmIA
(2) 编写上传表单
form.jsp
(3) 编写服务器端的代码用于接收上传的文件
webcontext目录下创建的文件夹
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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;
import org.apache.commons.io.IOUtils;
public class FileuploadServlet2 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
//1、创建磁盘文件项工厂
//作用:设置缓存文件的大小 设置临时文件存储的位置
String path_temp = this.getServletContext().getRealPath("temp");
//DiskFileItemFactory factory = new DiskFileItemFactory(1024*1024, new File(path_temp));
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(1024*1024);
factory.setRepository(new File(path_temp));
//2、创建文件上传的核心类
ServletFileUpload upload = new ServletFileUpload(factory);
//设置上传文件的名称的编码
upload.setHeaderEncoding("UTF-8");
//ServletFileUpload的API
boolean multipartContent = upload.isMultipartContent(request);//判断表单是否是文件上传的表单
if(multipartContent){
//是文件上传的表单
//***解析request获得文件项集合
List
parseRequest = upload.parseRequest(request);
if(parseRequest!=null){
for(FileItem item : parseRequest){
//判断是不是一个普通表单项
boolean formField = item.isFormField();
if(formField){
//username=zhangsan
String fieldName = item.getFieldName();
String fieldValue = item.getString("UTF-8");//对普通表单项的内容进行编码
System.out.println(fieldName+"----"+fieldValue);
//当表单是enctype="multipart/form-data"时 request.getParameter相关的方法
//String parameter = request.getParameter("username");
}else{
//文件上传项
//文件的名
String fileName = item.getName();
//获得上传文件的内容
InputStream in = item.getInputStream();
String path_store = this.getServletContext().getRealPath("upload");
OutputStream out = new FileOutputStream(path_store+"/"+fileName);
IOUtils.copy(in, out);
in.close();
out.close();
//删除临时文件
item.delete();
}
}
}
}else{
//不是文件上传表单
//使用原始的表单数据的获得方式 request.getParameter();
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}