文件上傳有SmartUpload、Apache的Commons fileupload.我們今天介紹Commons fileupload的用法。
1.commons-fileupload-1.3.1.jar
下載地址：http://pan.baidu.com/s/1kVtYMzH
2.web.xml
1 <!-- 上傳文件 服務器端 --> 2 <servlet> 3 <servlet-name>UploadServlet</servlet-name> 4 <servlet-class>com.servlet.UploadServlet</servlet-class> 5 <init-param> 6 <param-name>filePath</param-name><!-- 文件存儲路徑 --> 7 <param-value>F:\myeclipse\Workspaces\King\WebRoot\uploadfile\</param-value> 8 </init-param> 9 </servlet> 10 11 <servlet-mapping> 12 <servlet-name>UploadServlet</servlet-name> 13 <url-pattern>/servlet/UploadServlet</url-pattern> 14 </servlet-mapping>
3.UploadFile.jsp
1 <form action="servlet/UploadServlet" method="post" enctype="multipart/form-data"> 2 <div align="center"> 3 <fieldset > 4 <legend>上傳文件</legend><br/> 5 <div align="left">上傳文件1</div> 6 <div align="left"> 7 <input type="file" name="file1"/> 8 </div> 9 <div align="left">上傳文件2</div> 10 <div align="left"> 11 <input type="file" name="file2"/> 12 </div> 13 <div> 14 <div align='left'>上傳文件說明1</div> 15 <div align='left'><input type="text" name="description1"/></div> 16 </div> 17 <div> 18 <div align='left'>上傳文件說明2</div> 19 <div align='left'><input type="text" name="description2"/></div> 20 </div> 21 <div> 22 <div align='left'> 23 <input type='submit' value="上傳文件"/> 24 </div> 25 </div> 26 </fieldset> 27 </div> 28 </form>
4.servlet
1 package com.servlet;
2
3 import java.io.File;
4 import java.io.FileOutputStream;
5 import java.io.IOException;
6 import java.io.InputStream;
7 import java.io.InputStreamReader;
8 import java.io.OutputStream;
9 import java.io.PrintWriter;
10 import java.util.List;
11
12 import javax.servlet.ServletException;
13 import javax.servlet.http.HttpServlet;
14 import javax.servlet.http.HttpServletRequest;
15 import javax.servlet.http.HttpServletResponse;
16
17 import org.apache.commons.fileupload.DiskFileUpload;
18 import org.apache.commons.fileupload.FileItem;
19 import org.apache.commons.fileupload.FileUploadException;
20
21 import sun.swing.FilePane;
22
23 public class UploadServlet extends HttpServlet {
24
25 private String filePath;
26
27
28 /**
29 * Destruction of the servlet. <br>
30 */
31 public void destroy() {
32 super.destroy(); // Just puts "destroy" string in log
33 // Put your code here
34 }
35
36
37 public void doGet(HttpServletRequest request, HttpServletResponse response)
38 throws ServletException, IOException {
39
40 response.setCharacterEncoding("UTF-8");
41 response.getWriter().println("請以POST方式上傳文件");
42 }
43
44
45 public void doPost(HttpServletRequest request, HttpServletResponse response)
46 throws ServletException, IOException {
47 File file1 = null, file2 = null;
48 String description1 = null, description2 = null;
49 response.setCharacterEncoding("UTF-8");
50 request.setCharacterEncoding("UTF-8");
51 response.setContentType("text/html");
52 PrintWriter out = response.getWriter();
53
54 DiskFileUpload diskFileUpload = new DiskFileUpload();//解析request
55
56 try {
57 List<FileItem> fileList = diskFileUpload.parseRequest(request);//將結果放置到List中
58 out.println("遍歷所有的FileItem...</br>");
59 this.log("遍歷所有的FileItem...");
60 for(FileItem fileItem : fileList){
61 if(fileItem.isFormField()){//如果是文本域
62 if("description1".equals(fileItem.getFieldName())){
63 out.println("遍歷到description1...</br>");
64 description1 = new String(fileItem.getString().getBytes(),"UTF-8");
65 }
66 if("description2".equals(fileItem.getFieldName())){
67 out.println("遍歷到description2...</br>");
68 description2 = new String(fileItem.getString().getBytes(),"UTF-8");
69 }
70 }else{//否則為文件域
71 if("file1".equals(fileItem.getFieldName())){
72 File remoteFile = new File(new String(fileItem.getName().getBytes(),"UTF-8"));
73 out.println("遍歷到file1...</br>");
74 out.println("客戶端文件位置："+remoteFile.getAbsolutePath()+"</br>");
75 //服務器端文件，放在uploadfile文件夾下
76 file1 = new File(filePath,remoteFile.getName());
77 file1.getParentFile().mkdirs();//創建文件夾路徑
78 file1.createNewFile();//創建新文件
79 InputStream ins = fileItem.getInputStream();//FileItem的內容
80 OutputStream ous = new FileOutputStream(file1);//輸出到文件中
81 try{
82 byte[] buffer = new byte[1024];//字節緩存
83 int len = 0;//實際緩存長度
84 while((len=ins.read(buffer)) > -1){//循環讀入緩存
85 ous.write(buffer,0,len);
86 }
87 out.println("已保存文件"+file1.getAbsolutePath()+"</br>");
88 }
89 finally{
90 ous.close();
91 ins.close();
92 }
93 }
94 if("file2".equals(fileItem.getFieldName())){
95 File remoteFile = new File(new String(fileItem.getName().getBytes(),"UTF-8"));
96 out.println("遍歷到file2...</br>");
97 out.println("客戶端文件位置："+remoteFile.getAbsolutePath()+"</br>");
98 //服務器端文件，放在uploadfile文件夾下
99 file2 = new File(filePath,remoteFile.getName());
100 file2.getParentFile().mkdirs();//創建文件夾路徑
101 file2.createNewFile();//創建新文件
102 InputStream ins = fileItem.getInputStream();//FileItem的內容
103 OutputStream ous = new FileOutputStream(file2);//輸出到文件中
104 try{
105 byte[] buffer = new byte[1024];//字節緩存
106 int len = 0;//實際緩存長度
107 while((len=ins.read(buffer)) > -1){//循環讀入緩存
108 ous.write(buffer,0,len);
109 }
110 out.println("已保存文件"+file2.getAbsolutePath()+"</br>");
111 }
112 finally{
113 ous.close();
114 ins.close();
115 }
116 }
117 }
118 }
119 out.println("Request 解析完畢");
120 } catch (FileUploadException e) {
121 // TODO 自動生成的 catch 塊
122 out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
123 out.println("<HTML>");
124 out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
125 out.println(" <BODY>");
126
127 if(file1 != null){
128 out.println("<div>");
129 out.println(" <div align='left'>file1;</div>");
130 out.println(" <div align='left'><a href='"+request.getContextPath()+
131 file1.getName()+"'target=_blank>"+file1.getName()+"</a>");
132 out.println("</div>");
133 out.println("</div>");
134 }
135 if(file2 != null){
136 out.println("<div>");
137 out.println(" <div align='left'>file2;</div>");
138 out.println(" <div align='left'><a href='"+request.getContextPath()+
139 file2.getName()+"'target=_blank>"+file2.getName()+"</a>");
140 out.println("</div>");
141 out.println("</div>");
142 }
143 out.println("<div>");
144 out.println(" <div align='left'>description1:</div>");
145 out.println(" <div align='left'>");
146 out.println(description1);
147 out.println("</div>");
148 out.println("</div>");
149
150 out.println("<div>");
151 out.println(" <div align='left'>description2:</div>");
152 out.println(" <div align='left'>");
153 out.println(description2);
154 out.println("</div>");
155 out.println("</div>");
156
157 out.println(" </BODY>");
158 out.println("</HTML>");
159 out.flush();
160 out.close();
161 }
162
163 }
164
165 public String getServletInfo() {
166 return "This is my default servlet created by Eclipse";
167 }
168
169
170 public void init() throws ServletException {
171 // Put your code here
172 filePath = getServletConfig().getInitParameter("filePath");
173 }
174
175 }
6.
