使用注解实现文件上传
使用注解实现文件的上传
一、Part接口
1.Part接口
-
Part接口
- Servlet3.0将multipart/form-data的POST请求封装成Part，通过Part对上传的文件进行操作。
-
添加注解
- @MultipartConfig（一定不要忘记加）
-
获取Part对象集合
Collection<Part> parts=request.getParts();
二、单个文件上传
1.表单代码
<h2>文件上传</h2>
<form method="post" enctype="multipart/form-data" action="uploadServlet">
选择文件：<input type="file" name="file">
用户名：<input type="text" name="username">
<input type="submit" value="开始上传">
</form>
2.Servlet代码
package com.hkd.servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;
@WebServlet(urlPatterns = "/uploadServlet")
@MultipartConfig
public class UploadServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1.配置编码格式
req.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
System.out.println("用户名："+req.getParameter("username"));
//2.查看保存路径存储路径
String savePath=req.getServletContext().getRealPath("");
System.out.println(savePath);
//3.上传单个文件
//Servlet3.0将multipart/form-data的POST请求封装为part，通过Part对上传文件进行操作
Part part=req.getPart("file");//file对应表单输入框的name属性
String header=part.getHeader("content-disposition");
System.out.println("head:"+header);
//4.获取文件名
String fileName=getFileName(header);
//输出文件名
System.out.println("fileName:"+fileName);
String path=savePath+fileName;
System.out.println("Path:"+path);
part.write(path);
PrintWriter out=resp.getWriter();
out.println("上传成功");
out.flush();
out.close();
}
public String getFileName(String header) {
/**
* String[] tempArr1 =
* header.split(";");代码执行完之后，在不同的浏览器下，tempArr1数组里面的内容稍有区别
* 火狐或者google浏览器下：
* tempArr1={form-data,name="file",filename="snmp4j--api.zip"}
* IE浏览器下：tempArr1={form-data,name="file",filename="E:\snmp4j--api.zip"}
*/
String[] tempArr1 = header.split(";");
/**
* 火狐或者google浏览器下：tempArr2={filename,"snmp4j--api.zip"}
* IE浏览器下：tempArr2={filename,"E:\snmp4j--api.zip"}
*/
String[] tempArr2 = tempArr1[2].split("=");
// 获取文件名，兼容各种浏览器的写法
String fileName = tempArr2[1].substring(
tempArr2[1].lastIndexOf("\\") + 1).replaceAll("\"", "");
return fileName;
}
}
三、多个文件上传
1.表单代码
<html>
<head>
<title>测试文件上传</title>
</head>
<body>
<h2>文件上传</h2>
<form method="post" enctype="multipart/form-data" action="uploadServlet">
选择文件1：<input type="file" name="file1"><br>
选择文件2：<input type="file" name="file2"><br>
选择文件3：<input type="file" name="file3">
用户名：<input type="text" name="username">
<input type="submit" value="开始上传">
</form>
</body>
</html>
2.Servlet代码
package com.hkd.servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;
@WebServlet(urlPatterns = "/uploadServlet")
@MultipartConfig
public class UploadServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req,resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//1.配置编码格式
req.setCharacterEncoding("utf-8");
resp.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
System.out.println("用户名："+req.getParameter("username"));
//2.查看保存路径存储路径
String savePath=req.getServletContext().getRealPath("");
//上传多个文件
Collection<Part> parts= req.getParts();
for (Part part : parts) {
if (part!=null){
String header=part.getHeader("content-disposition");
String fileName=getFileName(header);
if ((!(fileName==null))&&(!fileName.equals(""))){
String fullName=savePath+fileName;
part.write(fullName);
}
}
}
PrintWriter out=resp.getWriter();
out.println("上传成功");
out.flush();
out.close();
}
public String getFileName(String header) {
/**
* String[] tempArr1 =
* header.split(";");代码执行完之后，在不同的浏览器下，tempArr1数组里面的内容稍有区别
* 火狐或者google浏览器下：
* tempArr1={form-data,name="file",filename="snmp4j--api.zip"}
* IE浏览器下：tempArr1={form-data,name="file",filename="E:\snmp4j--api.zip"}
*/
if (header.indexOf("filename")!=-1){
String[] tempArr1 = header.split(";");
/**
* 火狐或者google浏览器下：tempArr2={filename,"snmp4j--api.zip"}
* IE浏览器下：tempArr2={filename,"E:\snmp4j--api.zip"}
*/
String[] tempArr2 = tempArr1[2].split("=");
// 获取文件名，兼容各种浏览器的写法
String fileName = tempArr2[1].substring(
tempArr2[1].lastIndexOf("\\") + 1).replaceAll("\"", "");
return fileName;
}
return null;
}
public static void main(String[] args) {
UploadServlet uploadServlet=new UploadServlet();
String header="head:form-data; name=\"file\"; filename=\"执行前后.png\"";
String [] tempArr1=header.split(";");
for (String s : tempArr1) {
System.out.println(s);
}
String[] tempArr2 = tempArr1[2].split("=");
for (String s : tempArr2) {
System.out.println(s);
}
String fileName = tempArr2[1].substring(
tempArr2[1].lastIndexOf("\\") + 1).replaceAll("\"", "");
System.out.println(fileName);
}
}
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