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;     @Override    public 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 = new             HttpPost(                    "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 = new            HttpPost(                    "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:http://blog.csdn.net/johnny901114/article/details/7536764 谢谢!

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