Java乔晓松-android中上传图片到服务器Tomcat(Struts2)

在做android开发的时候，有时你会用到图片的上传功能，在我的android项目中，我是选中图片，点击上传多张图片

android客户端上传图片部分的代码如下：

package com.example.myphotos.utils;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.UUID;

import android.util.Log;

public class UploadUtil {
	private static final String TAG = "uploadFile";
	private static final int TIME_OUT = 10 * 1000; // 超时时间
	private static final String CHARSET = "utf-8"; // 设置编码

	/**
	 * 上传文件到服务器
	 *
	 * @param file
	 *            需要上传的文件
	 * @param RequestURL
	 *            请求的rul
	 * @return 返回响应的内容
	 */
	public static int uploadFile(File file, String RequestURL) {
		int res = 0;
		String result = null;
		String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成
		String PREFIX = "--", LINE_END = "\r\n";
		String CONTENT_TYPE = "multipart/form-data"; // 内容类型

		try {
			URL url = new URL(RequestURL);
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			conn.setReadTimeout(TIME_OUT);
			conn.setConnectTimeout(TIME_OUT);
			conn.setDoInput(true); // 允许输入流
			conn.setDoOutput(true); // 允许输出流
			conn.setUseCaches(false); // 不允许使用缓存
			conn.setRequestMethod("POST"); // 请求方式
			conn.setRequestProperty("Charset", CHARSET); // 设置编码
			conn.setRequestProperty("connection", "keep-alive");
			conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary="
					+ BOUNDARY);

			if (file != null) {
				/**
				 * 当文件不为空时执行上传
				 */
				DataOutputStream dos = new DataOutputStream(
						conn.getOutputStream());
				StringBuffer sb = new StringBuffer();
				sb.append(PREFIX);
				sb.append(BOUNDARY);
				sb.append(LINE_END);
				/**
				 * 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
				 * filename是文件的名字，包含后缀名
				 */

				sb.append("Content-Disposition: form-data; name=\"file\"; filename=\""
						+ file.getName() + "\"" + LINE_END);
				sb.append("Content-Type: application/octet-stream; charset="
						+ CHARSET + LINE_END);
				sb.append(LINE_END);
				dos.write(sb.toString().getBytes());
				InputStream is = new FileInputStream(file);
				byte[] bytes = new byte[1024];
				int len = 0;
				while ((len = is.read(bytes)) != -1) {
					dos.write(bytes, 0, len);
				}
				is.close();
				dos.write(LINE_END.getBytes());
				byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END)
						.getBytes();
				dos.write(end_data);
				dos.flush();
				/**
				 * 获取响应码 200=成功 当响应成功，获取响应的流
				 */
				res = conn.getResponseCode();
				Log.e(TAG, "response code:" + res);
				if (res == 200) {
					Log.e(TAG, "request success");
					InputStream input = conn.getInputStream();
					StringBuffer sb1 = new StringBuffer();
					int ss;
					while ((ss = input.read()) != -1) {
						sb1.append((char) ss);
					}
					result = sb1.toString();
					Log.e(TAG, "result : " + result);
				} else {
					Log.e(TAG, "request error");
				}
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return res;
	}
}

服务器段的代码如下：

服务器端用的Struts2，网上基本上都是Servlet，所以我就把Struts2的写出来，供大家学习

package www.csdn.image;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Random;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
 * ImagesAction 2013-6-18 下午9:02:58
 *
 * @author 乔晓松
 *
 */
public class ImagesAction extends ActionSupport {

	/**
	 *
	 */
	private static final long serialVersionUID = 1L;

	public List<String> list = new ArrayList<String>();
	private File file;
	private String fileContentType;
	private String fileFileName;

	public File getFile() {
		return file;
	}

	public void setFile(File file) {
		this.file = file;
	}

	public String getFileContentType() {
		return fileContentType;
	}

	public void setFileContentType(String fileContentType) {
		this.fileContentType = fileContentType;
	}

	public String getFileFileName() {
		return fileFileName;
	}

	public void setFileFileName(String fileFileName) {
		this.fileFileName = fileFileName;
	}

	public List<String> getList() {
		return list;
	}

	public String httpAllImages() {
		String path = ServletActionContext.getServletContext().getRealPath(
				"images");
		// System.out.println(path);
		File filePath = new File(path);
		File[] files = filePath.listFiles();
		for (int i = 0; i < files.length; i++) {
			File file = files[i];
			if (!file.isDirectory()) {
				String fileName = file.getName();
				String img = fileName.substring(fileName.lastIndexOf(".") + 1);
				if ("jpg".equals(img) || "jpeg".equals(img)
						|| "gif".equals(img) || "png".equals(img)) {

					list.add(fileName);
				}
			}
		}
		System.out.println(list.size());
		return "images";
	}

	@SuppressWarnings("deprecation")
	public String uploadFile() {
		System.out.println("-----------------");
		System.out.println(fileFileName + "------------------" + file.length());
		try {
			FileInputStream fis = new FileInputStream(file);
			String photospath = ServletActionContext.getRequest().getRealPath(
					"photos");
			System.out.println(photospath);
			File fs = new File(photospath, fileFileName);
			FileOutputStream fos = new FileOutputStream(fs);
			int len = 0;
			byte[] buffer = new byte[1024];

			while ((len = fis.read(buffer)) != -1) {
				fos.write(buffer, 0, len);
			}
			fos.flush();
			fos.close();
			fis.close();

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return "uploadfile";
	}
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
	<include file="struts-constant.xml"></include>
	<package name="test" namespace="/csdn" extends="json-default">
		<action name="ImagesAction_*" class="www.csdn.image.ImagesAction"
			method="{1}">
			<result name="images" type="json">list</result>
			<result name="uploadfile"></result>
		</action>
	</package>
</struts>