Servlet實現文件上傳的三種方法總結
1. 通過getInputStream()取得上傳文件。
/**
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package net.individuals.web.servlet;
import java.io.DataInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author Barudisshu
*/
@WebServlet(name = "UploadServlet", urlPatterns = {"/UploadServlet"})
public class UploadServlet extends HttpServlet {
/**
* Processes requests for both HTTP
* code>GET/code> and
* code>POST/code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
//讀取請求Body
byte[] body = readBody(request);
//取得所有Body內容的字符串表示
String textBody = new String(body, "ISO-8859-1");
//取得上傳的文件名稱
String fileName = getFileName(textBody);
//取得文件開始與結束位置
Position p = getFilePosition(request, textBody);
//輸出至文件
writeTo(fileName, body, p);
}
//構造類
class Position {
int begin;
int end;
public Position(int begin, int end) {
this.begin = begin;
this.end = end;
}
}
private byte[] readBody(HttpServletRequest request) throws IOException {
//獲取請求文本字節(jié)長度
int formDataLength = request.getContentLength();
//取得ServletInputStream輸入流對象
DataInputStream dataStream = new DataInputStream(request.getInputStream());
byte body[] = new byte[formDataLength];
int totalBytes = 0;
while (totalBytes formDataLength) {
int bytes = dataStream.read(body, totalBytes, formDataLength);
totalBytes += bytes;
}
return body;
}
private Position getFilePosition(HttpServletRequest request, String textBody) throws IOException {
//取得文件區(qū)段邊界信息
String contentType = request.getContentType();
String boundaryText = contentType.substring(contentType.lastIndexOf("=") + 1, contentType.length());
//取得實際上傳文件的氣勢與結束位置
int pos = textBody.indexOf("filename=\"");
pos = textBody.indexOf("\n", pos) + 1;
pos = textBody.indexOf("\n", pos) + 1;
pos = textBody.indexOf("\n", pos) + 1;
int boundaryLoc = textBody.indexOf(boundaryText, pos) - 4;
int begin = ((textBody.substring(0, pos)).getBytes("ISO-8859-1")).length;
int end = ((textBody.substring(0, boundaryLoc)).getBytes("ISO-8859-1")).length;
return new Position(begin, end);
}
private String getFileName(String requestBody) {
String fileName = requestBody.substring(requestBody.indexOf("filename=\"") + 10);
fileName = fileName.substring(0, fileName.indexOf("\n"));
fileName = fileName.substring(fileName.indexOf("\n") + 1, fileName.indexOf("\""));
return fileName;
}
private void writeTo(String fileName, byte[] body, Position p) throws IOException {
FileOutputStream fileOutputStream = new FileOutputStream("e:/workspace/" + fileName);
fileOutputStream.write(body, p.begin, (p.end - p.begin));
fileOutputStream.flush();
fileOutputStream.close();
}
// editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP
* code>GET/code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP
* code>POST/code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// /editor-fold>
}
2. 通過getPart()、getParts()取得上傳文件。
body格式：
POST http://www.example.com HTTP/1.1
Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryrGKCBY7qhFd3TrwA
------WebKitFormBoundaryrGKCBY7qhFd3TrwA
Content-Disposition: form-data; name="text"
title
------WebKitFormBoundaryrGKCBY7qhFd3TrwA
Content-Disposition: form-data; name="file"; filename="chrome.png"
Content-Type: image/png
PNG ... content of chrome.png ...
------WebKitFormBoundaryrGKCBY7qhFd3TrwA--
[html] view plain copy
/**
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package net.individuals.web.servlet;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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;
/**
*
* @author Barudisshu
*/
@MultipartConfig
@WebServlet(name = "UploadServlet", urlPatterns = {"/UploadServlet"})
public class UploadServlet extends HttpServlet {
/**
* Processes requests for both HTTP
* code>GET/code> and
* code>POST/code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Part part = request.getPart("photo");
String fileName = getFileName(part);
writeTo(fileName, part);
}
//取得上傳文件名
private String getFileName(Part part) {
String header = part.getHeader("Content-Disposition");
String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));
return fileName;
}
//存儲文件
private void writeTo(String fileName, Part part) throws IOException, FileNotFoundException {
InputStream in = part.getInputStream();
OutputStream out = new FileOutputStream("e:/workspace/" + fileName);
byte[] buffer = new byte[1024];
int length = -1;
while ((length = in.read(buffer)) != -1) {
out.write(buffer, 0, length);
}
in.close();
out.close();
}
// editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP
* code>GET/code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP
* code>POST/code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}
}
3、另一種較為簡單的方法：采用part的wirte(String fileName)上傳，瀏覽器將產生臨時TMP文件
/**
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package net.individuals.web.servlet;
import java.io.IOException;
import java.io.PrintWriter;
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;
/**
*采用part的wirte(String fileName)上傳，瀏覽器將產生臨時TMP文件。
* @author Barudisshu
*/
@MultipartConfig(location = "e:/workspace")
@WebServlet(name = "UploadServlet", urlPatterns = {"/UploadServlet"})
public class UploadServlet extends HttpServlet {
/**
* Processes requests for both HTTP
* code>GET/code> and
* code>POST/code> methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//處理中文文件名
request.setCharacterEncoding("UTF-8");
Part part = request.getPart("photo");
String fileName = getFileName(part);
//將文件寫入location指定的目錄
part.write(fileName);
}
private String getFileName(Part part) {
String header = part.getHeader("Content-Disposition");
String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));
return fileName;
}
// editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP
* code>GET/code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP
* code>POST/code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// /editor-fold>
}
以上就是Servlet實現文件上傳的實例，如有疑問請留言或者到本站社區(qū)交流討論，感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
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