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Java开发之文件上传
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文件上传有SmartUpload、Apache的Commons fileupload.我们今天介绍Commons fileupload的用法。
1. commons-fileupload-1.3.1.jar
下载地址：http://pan.baidu.com/s/1kVtYMzH
2.web.xml
<!-- 上传文件 服务器端 -->
<servlet>
<servlet-name>UploadServlet</servlet-name>
<servlet-class>com.servlet.UploadServlet</servlet-class>
<init-param>
<param-name>filePath</param-name><!-- 文件存储路径 -->
<param-value>F:\myeclipse\Workspaces\King\WebRoot\uploadfile\</param-value>
</init-param>
</servlet> <servlet-mapping>
<servlet-name>UploadServlet</servlet-name>
<url-pattern>/servlet/UploadServlet</url-pattern>
</servlet-mapping>
3.UploadFile.jsp
<form action="servlet/UploadServlet" method="post" enctype="multipart/form-data">
<div align="center">
<fieldset style="width:80%">
<legend>上传文件</legend><br/>
<div align="left">上传文件1</div>
<div align="left">
<input type="file" name="file1"/>
</div>
<div align="left">上传文件2</div>
<div align="left">
<input type="file" name="file2"/>
</div>
<div>
<div align='left'>上传文件说明1</div>
<div align='left'><input type="text" name="description1"/></div>
</div>
<div>
<div align='left'>上传文件说明2</div>
<div align='left'><input type="text" name="description2"/></div>
</div>
<div>
<div align='left'>
<input type='submit' value="上传文件"/>
</div>
</div>
</fieldset>
</div>
</form>
4.servlet
package com.servlet; import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.List; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException; import sun.swing.FilePane; public class UploadServlet extends HttpServlet { private String filePath; /**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
} public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setCharacterEncoding("UTF-8");
response.getWriter().println("请以POST方式上传文件");
} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
File file1 = null, file2 = null;
String description1 = null, description2 = null;
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
PrintWriter out = response.getWriter(); DiskFileUpload diskFileUpload = new DiskFileUpload();//解析request try {
List<FileItem> fileList = diskFileUpload.parseRequest(request);//将结果放置到List中
out.println("遍历所有的FileItem...</br>");
this.log("遍历所有的FileItem...");
for(FileItem fileItem : fileList){
if(fileItem.isFormField()){//如果是文本域
if("description1".equals(fileItem.getFieldName())){
out.println("遍历到description1...</br>");
description1 = new String(fileItem.getString().getBytes(),"UTF-8");
}
if("description2".equals(fileItem.getFieldName())){
out.println("遍历到description2...</br>");
description2 = new String(fileItem.getString().getBytes(),"UTF-8");
}
}else{//否则为文件域
if("file1".equals(fileItem.getFieldName())){
File remoteFile = new File(new String(fileItem.getName().getBytes(),"UTF-8"));
out.println("遍历到file1...</br>");
out.println("客户端文件位置："+remoteFile.getAbsolutePath()+"</br>");
//服务器端文件，放在uploadfile文件夹下
file1 = new File(filePath,remoteFile.getName());
file1.getParentFile().mkdirs();//创建文件夹路径
file1.createNewFile();//创建新文件
InputStream ins = fileItem.getInputStream();//FileItem的内容
OutputStream ous = new FileOutputStream(file1);//输出到文件中
try{
byte[] buffer = new byte[1024];//字节缓存
int len = 0;//实际缓存长度
while((len=ins.read(buffer)) > -1){//循环读入缓存
ous.write(buffer,0,len);
}
out.println("已保存文件"+file1.getAbsolutePath()+"</br>");
}
finally{
ous.close();
ins.close();
}
}
if("file2".equals(fileItem.getFieldName())){
File remoteFile = new File(new String(fileItem.getName().getBytes(),"UTF-8"));
out.println("遍历到file2...</br>");
out.println("客户端文件位置："+remoteFile.getAbsolutePath()+"</br>");
//服务器端文件，放在uploadfile文件夹下
file2 = new File(filePath,remoteFile.getName());
file2.getParentFile().mkdirs();//创建文件夹路径
file2.createNewFile();//创建新文件
InputStream ins = fileItem.getInputStream();//FileItem的内容
OutputStream ous = new FileOutputStream(file2);//输出到文件中
try{
byte[] buffer = new byte[1024];//字节缓存
int len = 0;//实际缓存长度
while((len=ins.read(buffer)) > -1){//循环读入缓存
ous.write(buffer,0,len);
}
out.println("已保存文件"+file2.getAbsolutePath()+"</br>");
}
finally{
ous.close();
ins.close();
}
}
}
}
out.println("Request 解析完毕");
} catch (FileUploadException e) {
// TODO 自动生成的 catch 块
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>"); if(file1 != null){
out.println("<div>");
out.println(" <div align='left'>file1;</div>");
out.println(" <div align='left'><a href='"+request.getContextPath()+
file1.getName()+"'target=_blank>"+file1.getName()+"</a>");
out.println("</div>");
out.println("</div>");
}
if(file2 != null){
out.println("<div>");
out.println(" <div align='left'>file2;</div>");
out.println(" <div align='left'><a href='"+request.getContextPath()+
file2.getName()+"'target=_blank>"+file2.getName()+"</a>");
out.println("</div>");
out.println("</div>");
}
out.println("<div>");
out.println(" <div align='left'>description1:</div>");
out.println(" <div align='left'>");
out.println(description1);
out.println("</div>");
out.println("</div>"); out.println("<div>");
out.println(" <div align='left'>description2:</div>");
out.println(" <div align='left'>");
out.println(description2);
out.println("</div>");
out.println("</div>"); out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
} } public String getServletInfo() {
return "This is my default servlet created by Eclipse";
} public void init() throws ServletException {
// Put your code here
filePath = getServletConfig().getInitParameter("filePath");
} }
6.
