java实现文件的上传功能 java实现文件的上传功能

本文实例为大家分享了java实现文件的上传功能的具体代码，供大家参考，具体内容如下
直接上代码了
一、上传界面

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二、Servlet处理

package com.ui.servlet; 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.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; import org.apache.tomcat.jni.OS; import com.mysql.jdbc.Field; /** * Servlet implementation class RegisterServlet */@WebServlet("/registerServlet")public class RegisterServlet extends HttpServlet {private static final long serialVersionUID = 1L; /*** @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)*/protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubif(!ServletFileUpload.isMultipartContent(request)){throw new RuntimeException("当前不支持文件上传"); }try {DiskFileItemFactory factory=new DiskFileItemFactory(); //设置使用临时文件的边界值，大鱼该值得文件上传会先保存在临时文件中，否则上传文件会直接写入到内存当中去//单位字节在这里设置的为1mfactory.setSizeThreshold(1024*1024*1); //设置临时文件String temppath=this.getServletContext().getRealPath("/temp"); File file2=new File(temppath); factory.setRepository(file2); //创建文件上传核心组件ServletFileUpload fileUpload=new ServletFileUpload(factory); //设置单个文件的大小不超过多少fileUpload.setFileSizeMax(1024*1024*2); //上传多个文件的要求总的大小不超过多少fileUpload.setSizeMax(1024*1024*5); fileUpload.setHeaderEncoding("utf-8"); //设置每一个item的字符编码为utf-8List items=fileUpload.parseRequest(request); for (FileItem fileItem : items) {if(fileItem.isFormField()){String filename=fileItem.getFieldName(); String fileValue=https://www.it610.com/article/fileItem.getString("utf-8"); System.out.println(filename+"----"+fileValue); }else //如果是文件上传表单项{String filename=fileItem.getName(); InputStream inputStream=fileItem.getInputStream(); //获取表单项的输入流String path=this.getServletContext().getRealPath("/fileContents"); File file=new File(path,filename); OutputStream outputStream=new FileOutputStream(file); int len=-1; byte[] bs=new byte[1024]; while((len=inputStream.read(bs))!=-1){outputStream.write(bs,0,len); }outputStream.close(); inputStream.close(); //删除临时文件fileItem.delete(); }}}catch (Exception e) {// TODO: handle exceptionSystem.out.println(e); }} }

三、实现结果