1. 通过getInputStream()取得上传文件。

001

/**

002	* To change this template, choose Tools | Templates

003	* and open the template in the editor.

004

*/

005	package net.individuals.web.servlet;

006

007	import java.io.DataInputStream;

008	import java.io.FileOutputStream;

009	import java.io.IOException;

010	import javax.servlet.ServletException;

011	import javax.servlet.annotation.WebServlet;

012	import javax.servlet.http.HttpServlet;

013	import javax.servlet.http.HttpServletRequest;

014	import javax.servlet.http.HttpServletResponse;

015

016

/**

017

*

018	* @author Barudisshu

019

*/

020	@WebServlet(name = "UploadServlet", urlPatterns = { "/UploadServlet"})

021	public class UploadServlet extends HttpServlet {

022

023

/**

024	* Processes requests for both HTTP

025	* <code>GET</code> and

026	* <code>POST</code> methods.

027

*

028	* @param request servlet request

029	* @param response servlet response

030	* @throws ServletException if a servlet-specific error occurs

031	* @throws IOException if an I/O error occurs

032

*/

033	protected void processRequest(HttpServletRequest request, HttpServletResponse response)

034	throws ServletException, IOException {

035	response.setContentType("text/html;charset=UTF-8");

036	//读取请求Body

037	byte[] body = readBody(request);

038	//取得所有Body内容的字符串表示

039	String textBody = new String(body, "ISO-8859-1");

040	//取得上传的文件名称

041	String fileName = getFileName(textBody);

042	//取得文件开始与结束位置

043	Position p = getFilePosition(request, textBody);

044

//输出至文件

045	writeTo(fileName, body, p);

046

}

047

048

//构造类

049	class Position {

050

051	int begin;

052

int end;

053

054	public Position(int begin, int end) {

055	this.begin = begin;

056	this.end = end;

057

}

058

}

059

060	private byte[] readBody(HttpServletRequest request) throws IOException {

061	//获取请求文本字节长度

062	int formDataLength = request.getContentLength();

063	//取得ServletInputStream输入流对象

064	DataInputStream dataStream = new DataInputStream(request.getInputStream());

065	byte body[] = new byte[formDataLength];

066	int totalBytes = 0;

067	while (totalBytes < formDataLength) {

068	int bytes = dataStream.read(body, totalBytes, formDataLength);

069	totalBytes += bytes;

070

}

071	return body;

072

}

073

074	private Position getFilePosition(HttpServletRequest request, String textBody) throws IOException {

075	//取得文件区段边界信息

076	String contentType = request.getContentType();

077	String boundaryText = contentType.substring(contentType.lastIndexOf("=") + 1, contentType.length());

078	//取得实际上传文件的气势与结束位置

079	int pos = textBody.indexOf("filename=\"");

080	pos = textBody.indexOf("\n", pos) + 1;

081	pos = textBody.indexOf("\n", pos) + 1;

082	pos = textBody.indexOf("\n", pos) + 1;

083	int boundaryLoc = textBody.indexOf(boundaryText, pos) - 4;

084	int begin = ((textBody.substring(0, pos)).getBytes("ISO-8859-1")).length;

085	int end = ((textBody.substring(0, boundaryLoc)).getBytes("ISO-8859-1")).length;

086

087	return new Position(begin, end);

088

}

089

090	private String getFileName(String requestBody) {

091	String fileName = requestBody.substring(requestBody.indexOf("filename=\"") + 10);

092	fileName = fileName.substring(0, fileName.indexOf("\n"));

093	fileName = fileName.substring(fileName.indexOf("\n") + 1, fileName.indexOf("\""));

094

095	return fileName;

096

}

097

098	private void writeTo(String fileName, byte[] body, Position p) throws IOException {

099	FileOutputStream fileOutputStream = new FileOutputStream("e:/workspace/" + fileName);

100	fileOutputStream.write(body, p.begin, (p.end - p.begin));

101	fileOutputStream.flush();

102	fileOutputStream.close();

103

}

104

105	// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

106

/**

107	* Handles the HTTP

108	* <code>GET</code> method.

109

*

110	* @param request servlet request

111	* @param response servlet response

112	* @throws ServletException if a servlet-specific error occurs

113	* @throws IOException if an I/O error occurs

114

*/

115

@Override

116	protected void doGet(HttpServletRequest request, HttpServletResponse response)

117	throws ServletException, IOException {

118	processRequest(request, response);

119

}

120

121

/**

122	* Handles the HTTP

123	* <code>POST</code> method.

124

*

125	* @param request servlet request

126	* @param response servlet response

127	* @throws ServletException if a servlet-specific error occurs

128	* @throws IOException if an I/O error occurs

129

*/

130

@Override

131	protected void doPost(HttpServletRequest request, HttpServletResponse response)

132	throws ServletException, IOException {

133	processRequest(request, response);

134

}

135

136

/**

137	* Returns a short description of the servlet.

138

*

139	* @return a String containing servlet description

140

*/

141

@Override

142	public String getServletInfo() {

143	return "Short description";

144	}// </editor-fold>

145

}

2. 通过getPart()、getParts()取得上传文件。

 

001

/**

002	* To change this template, choose Tools | Templates

003	* and open the template in the editor.

004

*/

005	package net.individuals.web.servlet;

006

007	import java.io.FileNotFoundException;

008	import java.io.FileOutputStream;

009	import java.io.IOException;

010	import java.io.InputStream;

011	import java.io.OutputStream;

012	import javax.servlet.ServletException;

013	import javax.servlet.annotation.MultipartConfig;

014	import javax.servlet.annotation.WebServlet;

015	import javax.servlet.http.HttpServlet;

016	import javax.servlet.http.HttpServletRequest;

017	import javax.servlet.http.HttpServletResponse;

018	import javax.servlet.http.Part;

019

020

/**

021

*

022	* @author Barudisshu

023

*/

024	@MultipartConfig

025	@WebServlet(name = "UploadServlet", urlPatterns = { "/UploadServlet"})

026	public class UploadServlet extends HttpServlet {

027

028

/**

029	* Processes requests for both HTTP

030	* <code>GET</code> and

031	* <code>POST</code> methods.

032

*

033	* @param request servlet request

034	* @param response servlet response

035	* @throws ServletException if a servlet-specific error occurs

036	* @throws IOException if an I/O error occurs

037

*/

038	protected void processRequest(HttpServletRequest request, HttpServletResponse response)

039	throws ServletException, IOException {

040	Part part = request.getPart("photo");

041	String fileName = getFileName(part);

042	writeTo(fileName, part);

043

}

044

045

//取得上传文件名

046	private String getFileName(Part part) {

047	String header = part.getHeader("Content-Disposition");

048	String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));

049

050	return fileName;

051

}

052

053

//存储文件

054	private void writeTo(String fileName, Part part) throws IOException, FileNotFoundException {

055	InputStream in = part.getInputStream();

056	OutputStream out = new FileOutputStream("e:/workspace/" + fileName);

057	byte[] buffer = new byte[1024];

058	int length = -1;

059	while ((length = in.read(buffer)) != -1) {

060	out.write(buffer, 0, length);

061

}

062

063	in.close();

064	out.close();

065

}

066

067	// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

068

/**

069	* Handles the HTTP

070	* <code>GET</code> method.

071

*

072	* @param request servlet request

073	* @param response servlet response

074	* @throws ServletException if a servlet-specific error occurs

075	* @throws IOException if an I/O error occurs

076

*/

077

@Override

078	protected void doGet(HttpServletRequest request, HttpServletResponse response)

079	throws ServletException, IOException {

080	processRequest(request, response);

081

}

082

083

/**

084	* Handles the HTTP

085	* <code>POST</code> method.

086

*

087	* @param request servlet request

088	* @param response servlet response

089	* @throws ServletException if a servlet-specific error occurs

090	* @throws IOException if an I/O error occurs

091

*/

092

@Override

093	protected void doPost(HttpServletRequest request, HttpServletResponse response)

094	throws ServletException, IOException {

095	processRequest(request, response);

096

}

097

098

/**

099	* Returns a short description of the servlet.

100

*

101	* @return a String containing servlet description

102

*/

103

@Override

104	public String getServletInfo() {

105	return "Short description";

106	}// </editor-fold>

107

}

另一种较为简单的方法：

01

/**

02	* To change this template, choose Tools | Templates

03	* and open the template in the editor.

04

*/

05	package net.individuals.web.servlet;

06

07	import java.io.IOException;

08	import java.io.PrintWriter;

09	import javax.servlet.ServletException;

10	import javax.servlet.annotation.MultipartConfig;

11	import javax.servlet.annotation.WebServlet;

12	import javax.servlet.http.HttpServlet;

13	import javax.servlet.http.HttpServletRequest;

14	import javax.servlet.http.HttpServletResponse;

15	import javax.servlet.http.Part;

16

17

/**

18	*采用part的wirte(String fileName)上传，浏览器将产生临时TMP文件。

19	* @author Barudisshu

20

*/

21	@MultipartConfig(location = "e:/workspace")

22	@WebServlet(name = "UploadServlet", urlPatterns = { "/UploadServlet"})

23	public class UploadServlet extends HttpServlet {

24

25

/**

26	* Processes requests for both HTTP

27	* <code>GET</code> and

28	* <code>POST</code> methods.

29

*

30	* @param request servlet request

31	* @param response servlet response

32	* @throws ServletException if a servlet-specific error occurs

33	* @throws IOException if an I/O error occurs

34

*/

35	protected void processRequest(HttpServletRequest request, HttpServletResponse response)

36	throws ServletException, IOException {

37

//处理中文文件名

38	request.setCharacterEncoding("UTF-8");

39	Part part = request.getPart("photo");

40	String fileName = getFileName(part);

41	//将文件写入location指定的目录

42	part.write(fileName);

43

}

44

45	private String getFileName(Part part) {

46	String header = part.getHeader("Content-Disposition");

47	String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));

48	return fileName;

49

}

50

51	// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

52

/**

53	* Handles the HTTP

54	* <code>GET</code> method.

55

*

56	* @param request servlet request

57	* @param response servlet response

58	* @throws ServletException if a servlet-specific error occurs

59	* @throws IOException if an I/O error occurs

60

*/

61

@Override

62	protected void doGet(HttpServletRequest request, HttpServletResponse response)

63	throws ServletException, IOException {

64	processRequest(request, response);

65

}

66

67

/**

68	* Handles the HTTP

69	* <code>POST</code> method.

70

*

71	* @param request servlet request

72	* @param response servlet response

73	* @throws ServletException if a servlet-specific error occurs

74	* @throws IOException if an I/O error occurs

75

*/

76

@Override

77	protected void doPost(HttpServletRequest request, HttpServletResponse response)

78	throws ServletException, IOException {

79	processRequest(request, response);

80

}

81

82

/**

83	* Returns a short description of the servlet.

84

*

85	* @return a String containing servlet description

86

*/

87

@Override

88	public String getServletInfo() {

89	return "Short description";

90	}// </editor-fold>

91

}

使用getParts()上传多个文件：

 

 

01

<!--

02	To change this template, choose Tools | Templates

03	and open the template in the editor.

04

-->

05	<!DOCTYPE html>

06

<html>

07

<head>

08	<title></title>

09	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

10

</head>

11

<body>

12

<div>

13	<form action="UploadServlet3" method="POST" enctype="multipart/form-data">

14

<table>

15

<tr>

16	<td><label for="file1">文件1：</label></td>

17	<td><input type="file" id="file1" name="file"></td>

18

</tr>

19

<tr>

20	<td><label for="file2">文件2：</label></td>

21	<td><input type="file" id="file2" name="file"></td>

22

</tr>

23

<tr>

24	<td><label for="file3">文件3：</label></td>

25	<td><input type="file" id="file3" name="file"></td>

26

</tr>

27

<tr>

28	<td colspan="2"><input type="submit" value="上传" name="upload"></td>

29

</tr>

30

</table>

31

</form>

32

</div>

33

</body>

34

</html>

 

 

对应Servlet代码：

01

/**

02	* To change this template, choose Tools | Templates

03	* and open the template in the editor.

04

*/

05	package net.individuals.web.servlet;

06

07	import java.io.IOException;

08	import java.io.PrintWriter;

09	import javax.servlet.ServletException;

10	import javax.servlet.annotation.MultipartConfig;

11	import javax.servlet.annotation.WebServlet;

12	import javax.servlet.http.HttpServlet;

13	import javax.servlet.http.HttpServletRequest;

14	import javax.servlet.http.HttpServletResponse;

15	import javax.servlet.http.Part;

16

17

/**

18

*

19	* @author Barudisshu

20

*/

21	@MultipartConfig(location = "e:/workspace")

22	@WebServlet(name = "UploadServlet", urlPatterns = { "/UploadServlet"})

23	public class UploadServlet extends HttpServlet {

24

25

/**

26	* Processes requests for both HTTP

27	* <code>GET</code> and

28	* <code>POST</code> methods.

29

*

30	* @param request servlet request

31	* @param response servlet response

32	* @throws ServletException if a servlet-specific error occurs

33	* @throws IOException if an I/O error occurs

34

*/

35	protected void processRequest(HttpServletRequest request, HttpServletResponse response)

36	throws ServletException, IOException {

37	request.setCharacterEncoding("utf-8");

38	//迭代Collection中所有Part对象

39	for (Part part : request.getParts()) {

40	//只处理上传文件区段

41	if (part.getName().startsWith("file")) {

42	String fileName = getFileName(part);

43	part.write(fileName);

44

}

45

}

46

}

47

48	private String getFileName(Part part) {

49	String header = part.getHeader("Content-Disposition");

50	String fileName = header.substring(header.indexOf("filename=\"") + 10, header.lastIndexOf("\""));

51	header.lastIndexOf("\"");

52	return fileName;

53

}

54

55	// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">

56

/**

57	* Handles the HTTP

58	* <code>GET</code> method.

59

*

60	* @param request servlet request

61	* @param response servlet response

62	* @throws ServletException if a servlet-specific error occurs

63	* @throws IOException if an I/O error occurs

64

*/

65

@Override

66	protected void doGet(HttpServletRequest request, HttpServletResponse response)

67	throws ServletException, IOException {

68	processRequest(request, response);

69

}

70

71

/**

72	* Handles the HTTP

73	* <code>POST</code> method.

74

*

75	* @param request servlet request

76	* @param response servlet response

77	* @throws ServletException if a servlet-specific error occurs

78	* @throws IOException if an I/O error occurs

79

*/

80

@Override

81	protected void doPost(HttpServletRequest request, HttpServletResponse response)

82	throws ServletException, IOException {

83	processRequest(request, response);

84

}

85

86

/**

87	* Returns a short description of the servlet.

88

*

89	* @return a String containing servlet description

90

*/

91

@Override

92	public String getServletInfo() {

93	return "Short description";

94	}// </editor-fold>

95

}