springMVC上传与下载

首先，springmvc.xml必须配置:

Java代码

1. <bean id="multipartResolver"

2. class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="utf-8"/>

<bean id="multipartResolver"

class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="utf-8"/>

2 WEB-INF/lib下必加入:commons-fileupload.jar与commons-io-1.4.jar二个文件
3 表单属性为: enctype="multipart/form-data"
工程项目图片如下:

具体代码如下:
FileUploadBean.java

Java代码

1. public class FileUploadBean {

2. private byte[] file;

4. public void setFile(byte[] file) {

5. this.file = file;

6. }

8. public byte[] getFile() {

9. return file;

10. }

11. }

public class FileUploadBean {

private byte[] file;

public void setFile(byte[] file) {

this.file = file;

}

public byte[] getFile() {

return file;

}

Java代码

1. package net.liuzd.web;

3. import java.io.BufferedInputStream;

4. import java.io.BufferedOutputStream;

5. import java.io.File;

6. import java.io.FileInputStream;

7. import java.io.IOException;

8. import java.net.BindException;

9. import java.util.ArrayList;

10.

11. import java.util.List;

12. import java.util.Map;

13.

14. import javax.servlet.http.HttpServletRequest;

15. import javax.servlet.http.HttpServletResponse;

16.

17. import org.springframework.stereotype.Controller;

18. import org.springframework.util.FileCopyUtils;

19. import org.springframework.web.bind.annotation.PathVariable;

20. import org.springframework.web.bind.annotation.RequestMapping;

21. import org.springframework.web.bind.annotation.RequestMethod;

22. import org.springframework.web.bind.annotation.RequestParam;

23. import org.springframework.web.multipart.MultipartFile;

24. import org.springframework.web.multipart.MultipartHttpServletRequest;

25. import org.springframework.web.multipart.commons.CommonsMultipartFile;

26. import org.springframework.web.servlet.ModelAndView;

27.

28. /**

30. * Company:http://liuzidong.iteye.com/ ;Makedate:2011-5-27 下午01:52:17

31. *

32. * @author liuzidong

33. * @version 1.0

34. * @since 1.0

35. *

36. */

37. @Controller

38. public class FileUploadController {

39.

40. @RequestMapping(value = "/upload", method = RequestMethod.POST)

41. public ModelAndView onSubmit(HttpServletRequest request,

42. HttpServletResponse response, BindException errors)

43. throws Exception {

44.

45. MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

46. CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest

47. .getFile("file");

48.

49. String name = multipartRequest.getParameter("name");

50. System.out.println("name: " + name);

51. // 获得文件名：

52. String realFileName = file.getOriginalFilename();

53. System.out.println("获得文件名：" + realFileName);

54. // 获取路径

55. String ctxPath = request.getSession().getServletContext().getRealPath(

56. "/")

57. + "images/";

58. // 创建文件

59. File dirPath = new File(ctxPath);

60. if (!dirPath.exists()) {

61. dirPath.mkdir();

62. }

63. File uploadFile = new File(ctxPath + realFileName);

64. FileCopyUtils.copy(file.getBytes(), uploadFile);

65. request.setAttribute("files", loadFiles(request));

66. return new ModelAndView("success");

67. }

68.

69. @RequestMapping(value = "/upload2", method = RequestMethod.POST)

70. public ModelAndView onSubmit2(HttpServletRequest request,

71. HttpServletResponse response, BindException errors)

72. throws Exception {

73.

74. // 转型为MultipartHttpRequest

75. MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

76. // 根据前台的name名称得到上传的文件

77. MultipartFile file = multipartRequest.getFile("file");

78. // 获得文件名：

79. String realFileName = file.getOriginalFilename();

80. // 获取路径

81. String ctxPath = request.getSession().getServletContext().getRealPath(

82. "/")

83. + "\" + "images\";

84. // 创建文件

85. File dirPath = new File(ctxPath);

86. if (!dirPath.exists()) {

87. dirPath.mkdir();

88. }

89. File uploadFile = new File(ctxPath + realFileName);

90. FileCopyUtils.copy(file.getBytes(), uploadFile);

91. request.setAttribute("files", loadFiles(request));

92. return new ModelAndView("success");

93. }

94.

95. @RequestMapping(value = "/upload3", method = RequestMethod.POST)

96. public String upload(@RequestParam("file")

97. MultipartFile image, HttpServletRequest request) throws IOException {

98.

99. String ctxPath = request.getSession().getServletContext().getRealPath(

100. "/")

101. + "\" + "images\";

102. System.out.println("路径：" + ctxPath);

103. File file = new File(ctxPath + "/" + image.getOriginalFilename());

104. // FileCopyUtils.copy(image.getBytes(),new

105. // File(ctxPath+"/"+image.getOriginalFilename()));

106. try {

107. image.transferTo(file); // 保存上传的文件

108. } catch (IllegalStateException e) {

109. e.printStackTrace();

110. } catch (IOException e) {

111. e.printStackTrace();

112. }

113. request.setAttribute("files", loadFiles(request));

114. return "success";

115. }

116.

117. // 多文件上传

118. @RequestMapping(value = "/upload4", method = RequestMethod.POST)

119. public ModelAndView fileUpload(HttpServletRequest request,

120. HttpServletResponse response, BindException errors)

121. throws Exception {

122.

123. MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

124. Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();

125. String ctxPath = request.getSession().getServletContext().getRealPath(

126. "/")

127. + "\" + "images\";

128.

129. File file = new File(ctxPath);

130. if (!file.exists()) {

131. file.mkdir();

132. }

133. String fileName = null;

134. for (Map.Entry<String, MultipartFile> entity : fileMap.entrySet()) {

135. // 上传文件名

136. // System.out.println("key: " + entity.getKey());

137. MultipartFile mf = entity.getValue();

138. fileName = mf.getOriginalFilename();

139. File uploadFile = new File(ctxPath + fileName);

140. FileCopyUtils.copy(mf.getBytes(), uploadFile);

141. }

142. request.setAttribute("files", loadFiles(request));

143. return new ModelAndView("success");

144. }

145.

146. // @ModelAttribute("files")//此属性用于初始类时调用,但上传文件后不能时时反应上传文件个数,不适合动态数据

147. public List<String> loadFiles(HttpServletRequest request) {

148. List<String> files = new ArrayList<String>();

149. String ctxPath = request.getSession().getServletContext().getRealPath(

150. "/")

151. + "\" + "images\";

152. File file = new File(ctxPath);

153. if (file.exists()) {

154. File[] fs = file.listFiles();

155. String fname = null;

156. for (File f : fs) {

157. fname = f.getName();

158. if (f.isFile()) {

159. files.add(fname);

160. }

161. }

162. }

163. return files;

164. }

165.

166. @RequestMapping("/download/{fileName}")

167. public ModelAndView download(@PathVariable("fileName")

168. String fileName, HttpServletRequest request, HttpServletResponse response)

169. throws Exception {

170.

171. response.setContentType("text/html;charset=utf-8");

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

173. java.io.BufferedInputStream bis = null;

174. java.io.BufferedOutputStream bos = null;

175.

176. String ctxPath = request.getSession().getServletContext().getRealPath(

177. "/")

178. + "\" + "images\";

179. String downLoadPath = ctxPath + fileName;

180. System.out.println(downLoadPath);

181. try {

182. long fileLength = new File(downLoadPath).length();

183. response.setContentType("application/x-msdownload;");

184. response.setHeader("Content-disposition", "attachment; filename="

185. + new String(fileName.getBytes("utf-8"), "ISO8859-1"));

186. response.setHeader("Content-Length", String.valueOf(fileLength));

187. bis = new BufferedInputStream(new FileInputStream(downLoadPath));

188. bos = new BufferedOutputStream(response.getOutputStream());

189. byte[] buff = new byte[2048];

190. int bytesRead;

191. while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

192. bos.write(buff, 0, bytesRead);

193. }

194. } catch (Exception e) {

195. e.printStackTrace();

196. } finally {

197. if (bis != null)

198. bis.close();

199. if (bos != null)

200. bos.close();

201. }

202. return null;

203. }

204.}

package net.liuzd.web;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.net.BindException;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;

import org.springframework.util.FileCopyUtils;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.multipart.MultipartFile;

import org.springframework.web.multipart.MultipartHttpServletRequest;

import org.springframework.web.multipart.commons.CommonsMultipartFile;

import org.springframework.web.servlet.ModelAndView;

/**

* Company:http://liuzidong.iteye.com/ Makedate:2011-5-27 下午01:52:17

* @author liuzidong

* @version 1.0

* @since 1.0

@Controller

public class FileUploadController {

@RequestMapping(value = "/upload", method = RequestMethod.POST)

public ModelAndView onSubmit(HttpServletRequest request,

HttpServletResponse response, BindException errors)

throws Exception {

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest

.getFile("file");

String name = multipartRequest.getParameter("name");

System.out.println("name: " + name);

// 获得文件名：

String realFileName = file.getOriginalFilename();

System.out.println("获得文件名：" + realFileName);

// 获取路径

String ctxPath = request.getSession().getServletContext().getRealPath(

"/")

+ "images/";

// 创建文件

File dirPath = new File(ctxPath);

if (!dirPath.exists()) {

dirPath.mkdir();

}

File uploadFile = new File(ctxPath + realFileName);

FileCopyUtils.copy(file.getBytes(), uploadFile);

request.setAttribute("files", loadFiles(request));

return new ModelAndView("success");

}

@RequestMapping(value = "/upload2", method = RequestMethod.POST)

public ModelAndView onSubmit2(HttpServletRequest request,

HttpServletResponse response, BindException errors)

throws Exception {

// 转型为MultipartHttpRequest

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

// 根据前台的name名称得到上传的文件

MultipartFile file = multipartRequest.getFile("file");

// 获得文件名：

String realFileName = file.getOriginalFilename();

// 获取路径

String ctxPath = request.getSession().getServletContext().getRealPath(

"/")

+ "\" + "images\";

// 创建文件

File dirPath = new File(ctxPath);

if (!dirPath.exists()) {

dirPath.mkdir();

}

File uploadFile = new File(ctxPath + realFileName);

FileCopyUtils.copy(file.getBytes(), uploadFile);

request.setAttribute("files", loadFiles(request));

return new ModelAndView("success");

}

@RequestMapping(value = "/upload3", method = RequestMethod.POST)

public String upload(@RequestParam("file")

MultipartFile image, HttpServletRequest request) throws IOException {

String ctxPath = request.getSession().getServletContext().getRealPath(

"/")

+ "\" + "images\";

System.out.println("路径：" + ctxPath);

File file = new File(ctxPath + "/" + image.getOriginalFilename());

// FileCopyUtils.copy(image.getBytes(),new

// File(ctxPath+"/"+image.getOriginalFilename()));

try {

image.transferTo(file); // 保存上传的文件

} catch (IllegalStateException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

request.setAttribute("files", loadFiles(request));

return "success";

}

// 多文件上传

@RequestMapping(value = "/upload4", method = RequestMethod.POST)

public ModelAndView fileUpload(HttpServletRequest request,

HttpServletResponse response, BindException errors)

throws Exception {

MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();

String ctxPath = request.getSession().getServletContext().getRealPath(

"/")

+ "\" + "images\";

File file = new File(ctxPath);

if (!file.exists()) {

file.mkdir();

}

String fileName = null;

for (Map.Entry<String, MultipartFile> entity : fileMap.entrySet()) {

// 上传文件名

// System.out.println("key: " + entity.getKey());

MultipartFile mf = entity.getValue();

fileName = mf.getOriginalFilename();

File uploadFile = new File(ctxPath + fileName);

FileCopyUtils.copy(mf.getBytes(), uploadFile);

}

request.setAttribute("files", loadFiles(request));

return new ModelAndView("success");

}

// @ModelAttribute("files")//此属性用于初始类时调用,但上传文件后不能时时反应上传文件个数,不适合动态数据

public List<String> loadFiles(HttpServletRequest request) {

List<String> files = new ArrayList<String>();

String ctxPath = request.getSession().getServletContext().getRealPath(

"/")

+ "\" + "images\";

File file = new File(ctxPath);

if (file.exists()) {

File[] fs = file.listFiles();

String fname = null;

for (File f : fs) {

fname = f.getName();

if (f.isFile()) {

files.add(fname);

}

return files;

}

@RequestMapping("/download/{fileName}")

public ModelAndView download(@PathVariable("fileName")

String fileName, HttpServletRequest request, HttpServletResponse response)

throws Exception {

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

request.setCharacterEncoding("UTF-8");

java.io.BufferedInputStream bis = null;

java.io.BufferedOutputStream bos = null;

String ctxPath = request.getSession().getServletContext().getRealPath(

"/")

+ "\" + "images\";

String downLoadPath = ctxPath + fileName;

System.out.println(downLoadPath);

try {

long fileLength = new File(downLoadPath).length();

response.setContentType("application/x-msdownload;");

response.setHeader("Content-disposition", "attachment; filename="

+ new String(fileName.getBytes("utf-8"), "ISO8859-1"));

response.setHeader("Content-Length", String.valueOf(fileLength));

bis = new BufferedInputStream(new FileInputStream(downLoadPath));

bos = new BufferedOutputStream(response.getOutputStream());

byte[] buff = new byte[2048];

int bytesRead;

while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {

bos.write(buff, 0, bytesRead);

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if (bis != null)

bis.close();

if (bos != null)

bos.close();

}

return null;

}

spring.xml

Java代码

1. <?xml version="1.0" encoding="UTF-8" ?>

2. <beans xmlns="http://www.springframework.org/schema/beans"

3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

4. xmlns:p="http://www.springframework.org/schema/p"

5. xmlns:context="http://www.springframework.org/schema/context"

6. xsi:schemaLocation="

7. http://www.springframework.org/schema/beans

8. http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

9. http://www.springframework.org/schema/context

10. http://www.springframework.org/schema/context/spring-context-3.0.xsd">

11. <!--

12. 自动搜索@Controller标注的类

13. 用于指明系统从哪个路径下寻找controller，然后提前初始化这些对象。

14. -->

15. <context:component-scan base-package="net.liuzd.web" />

16.

17.

18. <bean

19. class="org.springframework.web.servlet.view.InternalResourceViewResolver"

20. p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

21.

22.

23. <bean id="multipartResolver"

24. class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="utf-8">

25. <property name="maxUploadSize">

26. <value>104857600</value>

27. </property>

28. <property name="maxInMemorySize">

29. <value>4096</value>

30. </property>

31. </bean>

32. </beans>

<?xml version="1.0" encoding="UTF-8" ?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:p="http://www.springframework.org/schema/p"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="

http://www.springframework.org/schema/beans

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

http://www.springframework.org/schema/context

http://www.springframework.org/schema/context/spring-context-3.0.xsd">

<!--

自动搜索@Controller标注的类

用于指明系统从哪个路径下寻找controller，然后提前初始化这些对象。

-->

<context:component-scan base-package="net.liuzd.web" />

<bean

class="org.springframework.web.servlet.view.InternalResourceViewResolver"

p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

<bean id="multipartResolver"

class="org.springframework.web.multipart.commons.CommonsMultipartResolver" p:defaultEncoding="utf-8">

</property>

</property>

</bean>

</beans>

success.jsp

Java代码

1. <%@ taglib prefix="c" uri="/WEB-INF/c.tld"%>

2. <h1>Upload Successful</h1>

3. <c:forEach var="month" items="${files}">

4. <li><a href="${pageContext.request.contextPath}/download/${month}.do">${month}</a></li>

5. </c:forEach>

6. <hr><br>

7. <a href="${pageContext.request.contextPath}/index.jsp">返回</a>

<%@ taglib prefix="c" uri="/WEB-INF/c.tld"%>

<h1>Upload Successful</h1>

<c:forEach var="month" items="${files}">

<li><a href="${pageContext.request.contextPath}/download/${month}.do">${month}</a></li>

</c:forEach>

web.xml

Java代码

1. <?xml version="1.0" encoding="UTF-8"?>

2. <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"

3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

4. xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

5. http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

7. <context-param>

8. <param-name>log4jConfigLocation</param-name>

9. <param-value>/WEB-INF/classes/log4j.properties</param-value>

10. </context-param>

11.

12. <context-param>

13. <param-name>log4jRefreshInterval</param-name>

14. <param-value>60000</param-value>

15. </context-param>

16. <context-param>

17. <param-name>log4jExposeWebAppRoot</param-name>

18. <param-value>false</param-value>

19. </context-param>

20.

21. <listener>

22. <listener-class>

23. org.springframework.web.util.Log4jConfigListener

24. </listener-class>

25. </listener>

26.

27. <filter>

28. <filter-name>encodingFilter</filter-name>

29. <filter-class>

30. org.springframework.web.filter.CharacterEncodingFilter

31. </filter-class>

32. <init-param>

33. <param-name>encoding</param-name>

34. <param-value>UTF-8</param-value>

35. </init-param>

36. <init-param>

37. <param-name>forceEncoding</param-name>

38. <param-value>false</param-value>

39. </init-param>

40. </filter>

41.

42. <filter-mapping>

43. <filter-name>encodingFilter</filter-name>

44. <url-pattern>*.do</url-pattern>

45. </filter-mapping>

46.

47. <filter-mapping>

48. <filter-name>encodingFilter</filter-name>

49. <url-pattern>*.jsp</url-pattern>

50. </filter-mapping>

51.

52. <servlet>

53. <servlet-name>springmvc</servlet-name>

54. <servlet-class>

55. org.springframework.web.servlet.DispatcherServlet

56. </servlet-class>

57. <init-param>

58. <param-name>contextConfigLocation</param-name>

59. <param-value>classpath:springmvc.xml</param-value>

60. </init-param>

61. <load-on-startup>1</load-on-startup>

62. </servlet>

63.

64. <servlet-mapping>

65. <servlet-name>springmvc</servlet-name>

66. <url-pattern>*.do</url-pattern>

67. </servlet-mapping>

68. <welcome-file-list>

69. <welcome-file>index.jsp</welcome-file>

70. </welcome-file-list>

71. </web-app>

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