实现文件上传功能（FileUpload组件）
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文件上传：
项目中经常用到文件上传。
自己实现文件上传，使用文件上传组件fileupload组件
1、指定表单类型为文件上传，
enctype=”multipart/form-data”
2、提交方式必须是：post
3、表单中存在文件域元素。
需要的jar包
index.jsp
<body>
<form action="${pageContext.request.contextPath}/FileUploadTest" method = "post" enctype="multipart/form-data">
用户名：:<input type = "text" name = "username"/><br>
文件:<input type = "file" name = "file1"/><br>
<input type = "submit">
</form>
</body>
FileUploadTest.servlet
package zck.servlet; import java.io.File;
import java.io.IOException;
import java.io.InputStream;
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.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload; /**
* Servlet implementation class FileUploadTest
*/
@WebServlet("/FileUploadTest")
public class FileUploadTest extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public FileUploadTest() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//创建文件上传工厂类
DiskFileItemFactory fileItemFactory = new DiskFileItemFactory();
//创建文件上传核心类
ServletFileUpload upload = new ServletFileUpload(fileItemFactory);
upload.setFileSizeMax(30*1024*1024);//设置单个文件最大值30M
upload.setSizeMax(50*1024*1024);//最多50个文件 //判断表单是否是文件上传表单
if(upload.isMultipartContent(request)) {
//把请求数据转化为FileItem对象集合
try {
List<FileItem> list = upload.parseRequest(request);
//遍历得到每一个数据项
for(FileItem fileItem :list) {
//判断普通项，还是文件。
if(fileItem.isFormField()) {
//普通表单项
String fieldName =fileItem.getFieldName();//表单元素名称
String content =fileItem.getString();//值
System.out.print(fieldName+"\n"+content+"\n\n");
}else {
//文件上传表单项
String name =fileItem.getName();//获取文件名
//上传文件目录路径
String basePath = ("D:\\software\\eclipse\\workplace2019-1\\UploadFiles\\WebContent\\upload\\");
//新建文件
File file = new File(basePath,name);
fileItem.write(file);
fileItem.delete();//删除临时文件
}
}
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}else {
System.out.print("不是文件上传表单，不处理");
}
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
} }
运行界面
代码中主要对象及属性
阿里云国际版折扣https://www.yundadi.com |
| 阿里云国际，腾讯云国际，低至75折。AWS 93折 免费开户实名账号 代冲值 优惠多多 微信号：monov8 飞机：@monov6 |