一、服务器端代码

FileServlet.java

package org.xiazdong.servlet;

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

@WebServlet("/FileServlet")
public class FileServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		DiskFileItemFactory factory = new DiskFileItemFactory();
		ServletFileUpload upload = new ServletFileUpload(factory);
		upload.setFileSizeMax(1024*1024);        				//设置上传文件的最大容量
		try{
			List<FileItem>items  = upload.parseRequest(request);  //取得表单全部数据
			for(FileItem item:items){
				if(!item.isFormField()){	//如果是上传的文件
					 String name = "D:\\"+item.getName().substring(item.getName().lastIndexOf('\\')+1);    
					 String filename = name;
					 System.out.println(filename);
				     File f = new File(filename);	//保存到D盘
				     item.write(f);
				     System.out.println("上传成功");
				}
			}
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}

}

浏览器端代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Server Title</title>
</head>
<body>
	<form action="/Server/FileServlet" method="post" enctype="multipart/form-data">
		文件上传：<input type="file" name="filename"/><br/>
		<input type="submit" value="get提交">
	</form>
</body>
</html>

二、客户端前期准备及核心代码

1.前期准备

由于客户端需要模拟HTTP请求，因此我们可以先来看下文件上传的HTTP请求：

POST /Server/FileServlet HTTP/1.1
Accept: */*
Referer: http://localhost:8080/Server/2.html
Accept-Language: zh-CN
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0E; .NET4.0C; InfoPath.3)
Content-Type: multipart/form-data; boundary=---------------------------7dc372520758 //此处为分隔符，用来分隔多个文件和参数
Accept-Encoding: gzip, deflate
Host: localhost:8080
Content-Length: 14610
Connection: Keep-Alive
Cache-Control: no-cache

-----------------------------7dc372520758
Content-Disposition: form-data; name="filename"; filename="D:\lv6.GIF"
Content-Type: image/gif
文件内容
-----------------------------7dc372520758-- //结束时需要多加两个--

由此看出，这个HTTP请求比较难以模拟，此处封装了一个辅助类，是黎活明老师实现的，我们可以直接使用：

FormFile.java

package com.xiazdong.netword.http.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

/**
 * 上传文件
 */
public class FormFile {
	/* 上传文件的数据 */
	private byte[] data;
	private InputStream inStream;
	private File file;
	/* 文件名称 */
	private String filname;
	/* 请求参数名称*/
	private String parameterName;
	/* 内容类型 */
	private String contentType = "application/octet-stream";
	
	/**
	 * 此函数用来传输小文件
	 * @param filname
	 * @param data
	 * @param parameterName HTML的控件参数名称
	 * @param contentType
	 */
	public FormFile(String filname, byte[] data, String parameterName, String contentType) {
		this.data = data;
		this.filname = filname;
		this.parameterName = parameterName;
		if(contentType!=null) this.contentType = contentType;
	}
	/**
	 * 此函数用来传输大文件
	 * @param filname
	 * @param file
	 * @param parameterName
	 * @param contentType
	 */
	public FormFile(String filname, File file, String parameterName, String contentType) {
		this.filname = filname;
		this.parameterName = parameterName;
		this.file = file;
		try {
			this.inStream = new FileInputStream(file);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		if(contentType!=null) this.contentType = contentType;
	}
	
	public File getFile() {
		return file;
	}

	public InputStream getInStream() {
		return inStream;
	}

	public byte[] getData() {
		return data;
	}

	public String getFilname() {
		return filname;
	}

	public void setFilname(String filname) {
		this.filname = filname;
	}

	public String getParameterName() {
		return parameterName;
	}

	public void setParameterName(String parameterName) {
		this.parameterName = parameterName;
	}

	public String getContentType() {
		return contentType;
	}

	public void setContentType(String contentType) {
		this.contentType = contentType;
	}
	
}

HttpRequestUtil.java

package com.xiazdong.netword.http.util;


import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

/*
 * 此类用来发送HTTP请求
 * */
public class HttpRequestUtil {
	/**
	 * 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能:
	 *   <FORM METHOD=POST ACTION="http://192.168.0.200:8080/ssi/fileload/test.do" enctype="multipart/form-data">
			<INPUT TYPE="text" NAME="name">
			<INPUT TYPE="text" NAME="id">
			<input type="file" name="imagefile"/>
		    <input type="file" name="zip"/>
		 </FORM>
	 * @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)
	 * @param params 请求参数 key为参数名,value为参数值
	 * @param file 上传文件
	 */
	public static boolean uploadFiles(String path, Map<String, String> params, FormFile[] files) throws Exception{     
        final String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线
        final String endline = "--" + BOUNDARY + "--\r\n";//数据结束标志
        
        int fileDataLength = 0;
        if(files!=null&&files.length!=0){
	        for(FormFile uploadFile : files){//得到文件类型数据的总长度
	        	StringBuilder fileExplain = new StringBuilder();
	 	        fileExplain.append("--");
	 	        fileExplain.append(BOUNDARY);
	 	        fileExplain.append("\r\n");
	 	        fileExplain.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");
	 	        fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");
	 	        fileExplain.append("\r\n");
	 	        fileDataLength += fileExplain.length();
	        	if(uploadFile.getInStream()!=null){
	        		fileDataLength += uploadFile.getFile().length();
		 	    }else{
		 	    	fileDataLength += uploadFile.getData().length;
		 	    }
	        }
        }
        StringBuilder textEntity = new StringBuilder();
        if(params!=null&&!params.isEmpty()){
	        for (Map.Entry<String, String> entry : params.entrySet()) {//构造文本类型参数的实体数据
	            textEntity.append("--");
	            textEntity.append(BOUNDARY);
	            textEntity.append("\r\n");
	            textEntity.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n");
	            textEntity.append(entry.getValue());
	            textEntity.append("\r\n");
	        }
        }
        //计算传输给服务器的实体数据总长度
        int dataLength = textEntity.toString().getBytes().length + fileDataLength +  endline.getBytes().length;
        
        URL url = new URL(path);
        int port = url.getPort()==-1 ? 80 : url.getPort();
        Socket socket = new Socket(InetAddress.getByName(url.getHost()), port);	       
        OutputStream outStream = socket.getOutputStream();
        //下面完成HTTP请求头的发送
        String requestmethod = "POST "+ url.getPath()+" HTTP/1.1\r\n";
        outStream.write(requestmethod.getBytes());
        String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n";
        outStream.write(accept.getBytes());
        String language = "Accept-Language: zh-CN\r\n";
        outStream.write(language.getBytes());
        String contenttype = "Content-Type: multipart/form-data; boundary="+ BOUNDARY+ "\r\n";
        outStream.write(contenttype.getBytes());
        String contentlength = "Content-Length: "+ dataLength + "\r\n";
        outStream.write(contentlength.getBytes());
        String alive = "Connection: Keep-Alive\r\n";
        outStream.write(alive.getBytes());
        String host = "Host: "+ url.getHost() +":"+ port +"\r\n";
        outStream.write(host.getBytes());
        //写完HTTP请求头后根据HTTP协议再写一个回车换行
        outStream.write("\r\n".getBytes());
        //把所有文本类型的实体数据发送出来
        outStream.write(textEntity.toString().getBytes());	       
        //把所有文件类型的实体数据发送出来
        if(files!=null&&files.length!=0){
	        for(FormFile uploadFile : files){
	        	StringBuilder fileEntity = new StringBuilder();
	 	        fileEntity.append("--");
	 	        fileEntity.append(BOUNDARY);
	 	        fileEntity.append("\r\n");
	 	        fileEntity.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");
	 	        fileEntity.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");
	 	        outStream.write(fileEntity.toString().getBytes());
	 	        if(uploadFile.getInStream()!=null){
	 	        	byte[] buffer = new byte[1024];
	 	        	int len = 0;
	 	        	while((len = uploadFile.getInStream().read(buffer, 0, 1024))!=-1){
	 	        		outStream.write(buffer, 0, len);
	 	        	}
	 	        	uploadFile.getInStream().close();
	 	        }else{
	 	        	outStream.write(uploadFile.getData(), 0, uploadFile.getData().length);
	 	        }
	 	        outStream.write("\r\n".getBytes());
	        }
        }
        //下面发送数据结束标志，表示数据已经结束
        outStream.write(endline.getBytes());
        
        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        if(reader.readLine().indexOf("200")==-1){//读取web服务器返回的数据，判断请求码是否为200，如果不是200，代表请求失败
        	return false;
        }
        outStream.flush();
        outStream.close();
        reader.close();
        socket.close();
        return true;
	}
	/**
	 * 提交数据到服务器
	 * @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用http://www.itcast.cn或http://192.168.1.10:8080这样的路径测试)
	 * @param params 请求参数 key为参数名,value为参数值
	 * @param file 上传文件
	 */
	public static boolean uploadFile(String path, Map<String, String> params, FormFile file) throws Exception{
	   return uploadFiles(path, params, new FormFile[]{file});
	}
	/**
	 * 将输入流转为字节数组
	 * @param inStream
	 * @return
	 * @throws Exception
	 */
	public static byte[] read2Byte(InputStream inStream)throws Exception{
		ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = 0;
		while( (len = inStream.read(buffer)) !=-1 ){
			outSteam.write(buffer, 0, len);
		}
		outSteam.close();
		inStream.close();
		return outSteam.toByteArray();
	}
	/**
	 * 将输入流转为字符串
	 * @param inStream
	 * @return
	 * @throws Exception
	 */
	public static String read2String(InputStream inStream)throws Exception{
		ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = 0;
		while( (len = inStream.read(buffer)) !=-1 ){
			outSteam.write(buffer, 0, len);
		}
		outSteam.close();
		inStream.close();
		return new String(outSteam.toByteArray(),"UTF-8");
	}
}

2.核心代码

[java]view plaincopy
FormFile formFile = new FormFile(file.getName(), file, "document", "text/plain");  
boolean isSuccess = HttpRequestUtil.uploadFile("http://192.168.0.103:8080/Server/FileServlet", null, formFile);  

三、客户端代码

MainActivity.java

package org.xiazdong.network.fileupload;

import java.io.File;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.xiazdong.netword.http.util.FormFile;
import com.xiazdong.netword.http.util.HttpRequestUtil;

public class MainActivity extends Activity {
	private EditText fileName;
	private Button button;
	private OnClickListener listener = new OnClickListener(){
		@Override
		public void onClick(View v) {
			String fname = fileName.getText().toString();
			if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)||Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED_READ_ONLY)){
				File file = new File(Environment.getExternalStorageDirectory(),fname);	//获得SDCARD的文件
				if(file.exists()){
					FormFile formFile = new FormFile(file.getName(), file, "document", "text/plain");
					try {
						boolean isSuccess = HttpRequestUtil.uploadFile("http://192.168.0.103:8080/Server/FileServlet", null, formFile);
						if(isSuccess){
							Toast.makeText(MainActivity.this, "文件上传成功", Toast.LENGTH_SHORT).show();
						}
						else{
							Toast.makeText(MainActivity.this, "文件上传失败", Toast.LENGTH_SHORT).show();
						}
					} catch (Exception e) {
						e.printStackTrace();
					}
				}
				else{
					Toast.makeText(MainActivity.this, "文件不存在", Toast.LENGTH_SHORT).show();
				}
			}
			else{
				Toast.makeText(MainActivity.this, "SDCARD不存在", Toast.LENGTH_SHORT).show();
			}
		}
	};
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        fileName = (EditText)this.findViewById(R.id.filename);
        button = (Button)this.findViewById(R.id.button);
        button.setOnClickListener(listener);
	}
}

2
顶

0
踩

分享到：