servlet web文件上传
2016-01-22 17:04
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web文件上传也是一种POST方式，特别之处在于，需设置FORM的enctype属性为multipart/form-data。
并且需要使用文件域。
servlet的代码比较关键是这几句：
// 使用 DiskFileUpload 对象解析 request
DiskFileUpload diskFileUpload = new DiskFileUpload();
// 将 解析的结果 放置在 List 中
List<FileItem> list = diskFileUpload.parseRequest(request);
upload.html
并且需要使用文件域。
servlet的代码比较关键是这几句：
// 使用 DiskFileUpload 对象解析 request
DiskFileUpload diskFileUpload = new DiskFileUpload();
// 将 解析的结果 放置在 List 中
List<FileItem> list = diskFileUpload.parseRequest(request);
package com.servlet;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;
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.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
@SuppressWarnings("deprecation")
public class UploadServlet extends HttpServlet {
private static final long serialVersionUID = 7523024737218332088L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setCharacterEncoding("UTF-8");
response.getWriter().println("请以 POST 方式上传文件");
}
@SuppressWarnings("unchecked")
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
File file1 = null, file2 = null;
String description1 = null, description2 = null;
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <link rel='stylesheet' type='text/css' href='../css/style.css'>");
out.println(" <BODY>");
out.println("<div align=center><br/>");
out.println("<fieldset style='width:90%'><legend>上传文件</legend><br/>");
out.println(" <div class='line'>");
out.println(" <div align='left' class='leftDiv'>上传日志：</div>");
out.println(" <div align='left' class='rightDiv'>");
// 使用 DiskFileUpload 对象解析 request
DiskFileUpload diskFileUpload = new DiskFileUpload();
try {
// 将 解析的结果 放置在 List 中
List<FileItem> list = diskFileUpload.parseRequest(request);
out.println("遍历所有的 FileItem ... <br/>");
// 遍历 list 中所有的 FileItem
for(FileItem fileItem : list){
if(fileItem.isFormField()){
// 如果是 文本域
if("description1".equals(fileItem.getFieldName())){
// 如果该 FileItem 名称为 description1
out.println("遍历到 description1 ... <br/>");
description1 = new String(fileItem.getString().getBytes(), "UTF-8");
}
if("description2".equals(fileItem.getFieldName())){
// 如果该 FileItem 名称为 description2
out.println("遍历到 description2 ... <br/>");
description2 = new String(fileItem.getString().getBytes(), "UTF-8");
}
}
else{
// 否则，为文件域
if("file1".equals(fileItem.getFieldName())){
// 客户端文件路径构建的 File 对象
File remoteFile = new File(new String(fileItem.getName().getBytes(), "UTF-8"));
out.println("遍历到 file1 ... <br/>");
out.println("客户端文件位置: " + remoteFile.getAbsolutePath() + "<br/>");
// 服务器端文件，放在 upload 文件夹下
file1 = new File(this.getServletContext().getRealPath("attachment"), remoteFile.getName());
file1.getParentFile().mkdirs();
file1.createNewFile();
// 写文件，将 FileItem 的文件内容写到文件中
InputStream ins = fileItem.getInputStream();
OutputStream ous = new FileOutputStream(file1);
try{
byte[] buffer = new byte[1024];
int len = 0;
while((len=ins.read(buffer)) > -1)
ous.write(buffer, 0, len);
out.println("已保存文件" + file1.getAbsolutePath() + "<br/>");
}finally{
ous.close();
ins.close();
}
}
if("file2".equals(fileItem.getFieldName())){
// 客户端文件路径构建的 File 对象
File remoteFile = new File(new String(fileItem.getName().getBytes(), "UTF-8"));
out.println("遍历到 file2 ... <br/>");
out.println("客户端文件位置: " + remoteFile.getAbsolutePath() + "<br/>");
// 服务器端文件，放在 upload 文件夹下
file2 = new File(this.getServletContext().getRealPath("attachment"), remoteFile.getName());
file2.getParentFile().mkdirs();
file2.createNewFile();
// 写文件，将 FileItem 的文件内容写到文件中
InputStream ins = fileItem.getInputStream();
OutputStream ous = new FileOutputStream(file2);
try{
byte[] buffer = new byte[1024];
int len = 0;
while((len=ins.read(buffer)) > -1)
ous.write(buffer, 0, len);
out.println("已保存文件" + file2.getAbsolutePath() + "<br/>");
}finally{
ous.close();
ins.close();
}
}
}
}
out.println("Request 解析完毕");
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
out.println(" </div>");
out.println(" </div>");
if(file1 != null){
out.println(" <div class='line'>");
out.println(" <div align='left' class='leftDiv'>file1：</div>");
out.println(" <div align='left' class='rightDiv'>");
out.println(" <a href='" + request.getContextPath() + "/attachment/" + file1.getName() + "' target=_blank>" + file1.getName() + "</a>" );
out.println(" </div>");
out.println(" </div>");
}
if(file2 != null){
out.println(" <div class='line'>");
out.println(" <div align='left' class='leftDiv'>file2：</div>");
out.println(" <div align='left' class='rightDiv'>");
out.println(" <a href='" + request.getContextPath() + "/attachment/" + URLEncoder.encode(file2.getName(), "UTF-8") + "' target=_blank>" + file2.getName() + "</a>" );
out.println(" </div>");
out.println(" </div>");
}
out.println(" <div class='line'>");
out.println(" <div align='left' class='leftDiv'>description1：</div>");
out.println(" <div align='left' class='rightDiv'>");
out.println(description1);
out.println(" </div>");
out.println(" </div>");
out.println(" <div class='line'>");
out.println(" <div align='left' class='leftDiv'>description2：</div>");
out.println(" <div align='left' class='rightDiv'>");
out.println(description2);
out.println(" </div>");
out.println(" </div>");
out.println("</fieldset></div>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}upload.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>上传文件</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" type="text/css" href="css/style.css"> </head> <body> <form action="servlet/UploadServlet" method="post" enctype="multipart/form-data"> <div align="center"><br/> <fieldset style="width:90%"> <legend>上传文件</legend><br/> <div class='line'> <div align='left' class="leftDiv">上传文件一</div> <div align='left' class="rightDiv"> <input type="file" name="file1" class="text"> </div> </div> <div class='line'> <div align='left' class="leftDiv">上传文件二</div> <div align='left' class="rightDiv"> <input type="file" name="file2" class="text"> </div> </div> <div class='line'> <div align='left' class="leftDiv">上传文件说明一</div> <div align='left' class="rightDiv"><input type="text" name="description1" class="text"></div> </div> <div class='line'> <div align='left' class="leftDiv">上传文件说明二</div> <div align='left' class="rightDiv"><input type="text" name="description2" class="text"></div> </div> <div class='line'> <div align='left' class="leftDiv"></div> <div align='left' class="rightDiv"><br/> <input type="submit" value=" 上传文件 " class="button"> </div> </div> </fieldset> </div> </form> </body> </html>
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