JavaWeb文件上传开发实例

JavaWeb文件上传开发实例

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://xiazai.jb51.net/201608/yuanma/javawebfileupload(jb51.net).rar

2.web.xml

UploadServlet

com.servlet.UploadServlet

filePath

F:\myeclipse\Workspaces\King\WebRoot\uploadfile\

UploadServlet

/servlet/UploadServlet

3.UploadFile.jsp

上传文件

3.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.

*/

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 fileList =http:// diskFileUpload.parseRequest(request);//将结果放置到List中

out.println("遍历所有的FileItem...");

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...");

description1 = new String(fileItem.getString().getBytes(),"UTF-8");

}

if("description2".equals(fileItem.getFieldName())){

out.println("遍历到description2...");

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...");

out.println("客户端文件位置："+remoteFile.getAbsolutePath()+"");

//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()+"");

}

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...");

out.println("客户端文件位置："+remoteFile.getAbsolutePath()+"");

//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()+"");

}

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(" ");

out.println("");

out.println("

out.println("

if(file1 != null){

out.println("

out.println("

out.println("

out.println("

out.println("

}

if(file2 != null){

out.println("

out.println("

out.println("

out.println("

out.println("

}

out.println("

out.println("

out.println("

out.println(description1);

out.println("

out.println("

out.println("

out.println("

out.println("

out.println(description2);

out.println("

out.println("

out.println(" ");

out.println("");

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().getInitParameterJCsEhy("filePath");

}

}

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