android通过Base64往服务器上传图片和对象

在下载Base64.java文件 http://iharder.sourceforge.net/current/java/base64/,分别添加到客户端和服务器端. 1>我们知道在web中实现文件上传可以通过apache的项目,那么在android中把文件上传到服务器端,当然也可以通过该方式,但是也可以通过base64,这样就相当于把一个字符串传到服务器,然后在服务器端通过Base64.decode()方法解码接口,返回的字节数组byte[]在android side:

public class MainActivity extends Activity {InputStream is = null;@Overridepublic void onCreate(Bundle icicle) {super.onCreate(icicle);setContentView(R.layout.main);Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),R.drawable.a1);ByteArrayOutputStream bao = new ByteArrayOutputStream();bitmapOrg.compress(Bitmap.CompressFormat.PNG, 90, bao);byte[] ba = bao.toByteArray();String ba1 = Base64.encodeBytes(ba);ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();nameValuePairs.add(new BasicNameValuePair("image", ba1));try {HttpClient httpclient = new DefaultHttpClient();HttpPost httppost = newHttpPost("http://192.168.0.101:8080/ServletClassloadTest/servlet/UploadImage");httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));HttpResponse response = httpclient.execute(httppost);HttpEntity entity = response.getEntity();is = entity.getContent();} catch (Exception e) {Log.e("log_tag", "Error in http connection " + e.toString());}}}

在server side:

        String result = request.getParameter("image")byte[] result = Base64.decode()OutputStream out = new FileOutputStream("C:\\a.png");out.write(result);out.close();

测试结果:在C盘找到如下文件2>同理我们也可以在客户端把对象传递到服务器端.(这是把多个对象传递给服务器端,传递单个对象更加简单)在android side:

public void onCreate(Bundle icicle) {super.onCreate(icicle);setContentView(R.layout.main);Collect conCollect = new Collect(new Person[]{new Person("yzq",12),new Person("johnny",21)});String ba1 = null;try {ba1 = Base64.encodeObject(conCollect);} catch (IOException e) {e.printStackTrace();ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();nameValuePairs.add(new BasicNameValuePair("image", ba1));try {HttpClient httpclient = new DefaultHttpClient();HttpPost httppost = newHttpPost("http://192.168.0.101:8080/ServletClassloadTest/servlet/UploadImage");httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));HttpResponse response = httpclient.execute(httppost);HttpEntity entity = response.getEntity();is = entity.getContent();} catch (Exception e) {Log.e("log_tag", "Error in http connection " + e.toString());}}

Person类public class Person implements Serializable{private String name;private int age;public Person(String name, int age) {super();this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}Collect 类public class Collect implements Serializable{public Person[] ps;public Collect(Person[] ps) {super();this.ps = ps;}}在server side:public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");String image = request.getParameter("image");System.out.println("result"+image);try {Collect collect = (Collect)com.ieheima.servlet.Base64.decodeToObject(image);Person[] ps = collect.ps;System.out.println("长度:"+ps.length);for (int i = 0; i < ps.length; i++) {System.out.println(ps[i].getName());}} catch (ClassNotFoundException e) {e.printStackTrace();}}在控制台输出结果:

需要注意的是在服务器端也要有相同的类Collect和Person,同时包名也要一样.如果传输的对象过大,可能会导致内存溢出.还需要给实现了Serializable接口的类,定一个一个serialVersionUID希望以上Base64的讲解能够对读者有帮助,如果有什么错误尽情读者批评之处,不胜感谢..转载请注明出处: /article/3711730.html谢谢!