图片上传最终版本

1. SERVLET
3. packagecom.bjsxt.shopping.servlet;
5. importjava.io.File;
6. importjava.io.IOException;
7. importjava.io.PrintWriter;
8. importjava.util.Iterator;
9. importjava.util.List;
10. importjavax.servlet.ServletConfig;
11. importjavax.servlet.ServletException;
12. importjavax.servlet.http.HttpServlet;
13. importjavax.servlet.http.HttpServletRequest;
14. importjavax.servlet.http.HttpServletResponse;
15. importorg.apache.commons.fileupload.FileItem;
16. importorg.apache.commons.fileupload.FileUploadException;
17. importorg.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
18. importorg.apache.commons.fileupload.disk.DiskFileItemFactory;
19. importorg.apache.commons.fileupload.servlet.ServletFileUpload;
21. publicclassFileUploadServletextendsHttpServlet
22. {
23. //定义成员变量来记录上传的路径
24. privateStringupLoadPath="";
25. @Override
26. //重写init(ServletConfigconfig)方法（不是voidinit()）来取得WEB.XML的值
27. publicvoidinit(ServletConfigconfig)throwsServletException
28. {
29. this.upLoadPath=config.getInitParameter("upload");
30. }
32. privatestaticfinallongserialVersionUID=1L;
34. publicFileUploadServlet()
35. {
36. super();
37. }
39. protectedvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException
40. {
41. this.doPost(request,response);
42. }
44. protectedvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException
45. {
46. request.setCharacterEncoding("utf-8");
47. intid=-1;
48. finallongMAX_SIZE=300*1024*1024;//设置上传文件最大值
49. //允许上传的文件格式的列表
50. finalString[]allowedExt=newString[]{"jpg","jpeg","gif","txt","doc","mp3","wma","m4a","rar","zip"};
51. response.setContentType("text/html");
52. //设置字符编码为UTF-8,统一编码，处理出现乱码问题
53. response.setCharacterEncoding("UTF-8");
54. //实例化一个硬盘文件工厂,用来配置上传组件ServletFileUpload
55. DiskFileItemFactorydfif=newDiskFileItemFactory();
56. dfif.setSizeThreshold(4096);//设置上传文件时用于临时存放文件的内存大小,这里是4K.多于的部分将临时存在硬盘
57. dfif.setRepository(newFile(request.getRealPath("/")+"ImagesUploadTemp"));//设置存放临时文件的目录,web根目录下的ImagesUploadTemp目录
59. //用以上工厂实例化上传组件
60. ServletFileUploadsfu=newServletFileUpload(dfif);
61. //设置最大上传大小
62. sfu.setSizeMax(MAX_SIZE);
63. PrintWriterout=response.getWriter();
64. //从request得到所有上传域的列表
65. ListfileList=null;
66. try
67. {
68. fileList=sfu.parseRequest(request);
69. }catch(FileUploadExceptione)
70. {//处理文件尺寸过大异常
71. if(einstanceofSizeLimitExceededException)
72. {
73. out.println("文件尺寸超过规定大小:"+MAX_SIZE+"字节<p/>");
74. out.println("<ahref=\"./admin/manager/productlist.jsp\">返回</a>");
75. return;
76. }
77. e.printStackTrace();
78. }
79. //没有文件上传
80. if(fileList==null||fileList.size()==0)
81. {
82. out.println("请选择上传文件<p/>");
83. out.println("<ahref=\"./admin/manager/productlist.jsp\">返回</a>");
84. return;
85. }
86. //得到所有上传的文件
87. IteratorfileItr=fileList.iterator();
88. //循环处理所有文件
89. while(fileItr.hasNext())
90. {
91. FileItemfileItem=null;
92. Stringpath=null;
93. longsize=0;
94. //得到当前文件
95. fileItem=(FileItem)fileItr.next();
96. //忽略简单form字段而不是上传域的文件域(<inputtype="text"/>等)
97. if(fileItem!=null&&fileItem.isFormField())
98. {
99. if(fileItem.getFieldName().equals("id"))
100. {
101. id=Integer.parseInt(fileItem.getString());
102. }
103. }
104. if(fileItem!=null&&!fileItem.isFormField())
105. {
106. //得到文件的完整路径
107. path=fileItem.getName();
108. //得到文件的大小
109. size=fileItem.getSize();
110. if("".equals(path)||size==0)
111. {
112. out.println("请选择上传文件<p/>");
113. out.println("<ahref=\"./admin/manager/productlist.jsp\">返回</a>");
114. return;
115. }
116. //得到去除路径的文件名
117. Stringt_name=path.substring(path.lastIndexOf("\\")+1);
118. //得到文件的扩展名(无扩展名时将得到全名)
119. Stringt_ext=t_name.substring(t_name.lastIndexOf(".")+1);
120. //拒绝接受规定文件格式之外的文件类型
121. intallowFlag=0;
122. intallowedExtCount=allowedExt.length;
123. for(;allowFlag<allowedExtCount;allowFlag++)
124. {
125. if(allowedExt[allowFlag].equals(t_ext))
126. break;
127. }
128. if(allowFlag==allowedExtCount)
129. {
130. out.println("请上传以下类型的文件<p/>");
131. for(allowFlag=0;allowFlag<allowedExtCount;allowFlag++)
132. out.println("*."+allowedExt[allowFlag]+"");
133. out.println("<p/><ahref=\"./admin/manager/productlist.jsp\">返回</a>");
134. return;
135. }
137. //longnow=System.currentTimeMillis();
138. //根据系统时间生成上传后保存的文件名
139. //Stringprefix=String.valueOf(now);
140. //保存的最终文件完整路径,保存在web根目录下的ImagesUploaded目录下
141. //Stringu_name=request.getRealPath("/")+"ImagesUploaded/"
142. //+prefix+"."+t_ext;
143. //Stringfilename=t_name;
144. //System.out.println(t_name);
145. try
146. {
147. //保存文件到C:\\upload目录下
148. //统一将文件的扩展名改为　jpg　方便在页面中显示
149. fileItem.write(newFile(upLoadPath+id+"."+"jpg"));
150. //System.out.println(filename);
151. out.println("文件上传成功.已保存到:"+upLoadPath+id+"."+"jpg"+"文件大小:"+size+"字节<p/>");
152. out.println("<ahref=\"./admin/manager/productlist.jsp\">继续上传</a>");
153. }catch(Exceptione)
154. {
155. e.printStackTrace();
156. }
157. }
158. }
159. }
160. }
162. WEB.XML中写入下面的内容：
163. <servlet>
164. <description>ThisisthedescriptionofmyJ2EEcomponent</description>
165. <display-name>ThisisthedisplaynameofmyJ2EEcomponent</display-name>
166. <servlet-name>FileUploadServlet</servlet-name>
167. <servlet-class>com.bjsxt.shopping.servlet.FileUploadServlet</servlet-class>
168. <init-param>
169. <param-name>upload</param-name>
170. <param-value>E:\\workspace\\MyProjest\\Shopping\\WebRoot\\images\\product\\</param-value>
171. </init-param>
172. </servlet>
175. 其实最好的方法是增加一下属性文件，把要上传的路径写到该文件中，要上传时再从中读取这个路径