Android本地选择图片显示并上传（客户端+服务器）

自己写的一个小例子，还没有测试，仅供参考

安卓客户端

MainActivity.java

import java.io.File;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.ContentResolver;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

private static String requestURL = "http://localhost:9999/Struts_Study/UploadFileServlet";
private Button selectImage, uploadImage;
private ImageView imageView;
private String picPath = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
selectImage = (Button) this.findViewById(R.id.selectImage);
uploadImage = (Button) this.findViewById(R.id.uploadImage);
selectImage.setOnClickListener(this);
uploadImage.setOnClickListener(this);
imageView = (ImageView) this.findViewById(R.id.imageView);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.selectImage:
/*** * 这个是调用android内置的intent，来过滤图片文件 ，同时也可以过滤其他的 */
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, 1);
break;
case R.id.uploadImage:
if (picPath == null) {
Toast.makeText(MainActivity.this, "请选择图片！", 1000).show();
} else {
final File file = new File(picPath);
if (file != null) {
int request = UploadUtil.uploadFile(file, requestURL);
uploadImage.setText(request);
}
}
break;
default:
break;
}

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK) {
/** * 当选择的图片不为空的话，在获取到图片的途径 */
Uri uri = data.getData();
Log.e("tag", "uri = " + uri);
try {
String[] pojo = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, pojo, null, null, null);
if (cursor != null) {
ContentResolver cr = this.getContentResolver();
int colunm_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String path = cursor.getString(colunm_index);
/***
* * 这里加这样一个判断主要是为了第三方的软件选择，比如：使用第三方的文件管理器的话，你选择的文件就不一定是图片了，
* * 这样的话，我们判断文件的后缀名 如果是图片格式的话，那么才可以
*/
if (path.endsWith("jpg") || path.endsWith("png")) {
picPath = path;
Bitmap bitmap = BitmapFactory.decodeStream(cr.openInputStream(uri));
imageView.setImageBitmap(bitmap);
} else {
alert();
}
} else {
alert();
}
} catch (Exception e) {
}
}
super.onActivityResult(requestCode, resultCode, data);
}

private void alert() {
Dialog dialog = new AlertDialog.Builder(this).setTitle("提示")
.setMessage("您选择的不是有效的图片")
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
picPath = null;
}
}).create();
dialog.show();
}
}

 工具类

 UploadUtil.java

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;
}
}

布局文件

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.yanglic.imageupload.MainActivity" >

<Button
android:id="@+id/selectImage"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="选择图片" />

<Button
android:id="@+id/uploadImage"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="上传图片" />

<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>

服务器端

AndroidServlet.java

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

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.tomcat.util.http.fileupload.FileItem;

public class AndroidServlet {

public void doPost(HttpServletRequest request,
a8a4
HttpServletResponse response)
throws ServletException, IOException {

String temp = request.getSession().getServletContext().getRealPath("/")
+ "temp"; // 临时目录
System.out.println("temp=" + temp);
String loadpath = request.getSession().getServletContext()
.getRealPath("/")
+ "Image"; // 上传文件存放目录
System.out.println("loadpath=" + loadpath);
DiskFileUpload fu = new DiskFileUpload();
fu.setSizeMax(1 * 1024 * 1024); // 设置允许用户上传文件大小,单位:字节
fu.setSizeThreshold(4096); // 设置最多只允许在内存中存储的数据,单位:字节
fu.setRepositoryPath(temp); // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录

// 开始读取上传信息
int index = 0;
List fileItems = null;

try {
fileItems = fu.parseRequest(request);
System.out.println("fileItems=" + fileItems);
} catch (Exception e) {
e.printStackTrace();
}

Iterator iter = fileItems.iterator(); // 依次处理每个上传的文件
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();// 忽略其他不是文件域的所有表单信息
if (!item.isFormField()) {
String name = item.getName();// 获取上传文件名,包括路径
name = name.substring(name.lastIndexOf("\\") + 1);// 从全路径中提取文件名
long size = item.getSize();
if ((name == null || name.equals("")) && size == 0)
continue;
int point = name.indexOf(".");
name = (new Date()).getTime()
+ name.substring(point, name.length()) + index;
index++;
File fNew = new File(loadpath, name);
try {
item.write(fNew);
} catch (Exception e) {
e.printStackTrace();
}

} else// 取出不是文件域的所有表单信息
{
String fieldvalue = item.getString();
// 如果包含中文应写为：(转为UTF-8编码)
// String fieldvalue = new
// String(item.getString().getBytes(),"UTF-8");
}
}
String text1 = "11";
response.sendRedirect("result.jsp?text1=" + text1);
}

}

配置文件

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>UploadFileServlet</servlet-name>
<servlet-class>com.yanglic.action.AndroidServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>UploadFileServlet</servlet-name>
<url-pattern>/UploadFileServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>result.jsp</welcome-file>
</welcome-file-list>

</web-app>

页面

result.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
安卓服务器测试页面
</body>
</html>

 

谢谢大家！