转自：http://blog.csdn.net/wolaizhaomengxiang/article/details/22721779
AsyncHttpClient 是一个框架提供的库 可以异步传输，使用时需下载android-async-http-1.4.4.jar包导入到项目中
下载地址：http://loopj.com/android-async-http
public static void reg(final Context cont,Bitmap photodata,String regData) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//将bitmap一字节流输出 Bitmap.CompressFormat.PNG 压缩格式，100：压缩率，baos：字节流
photodata.compress(Bitmap.CompressFormat.PNG, 100, baos);
baos.close();
byte[] buffer = baos.toByteArray();
System.out.println("图片的大小："+buffer.length);
//将图片的字节流数据加密成base64字符输出
String photo = Base64.encodeToString(buffer, 0, buffer.length,Base64.DEFAULT);
//photo=URLEncoder.encode(photo,"UTF-8");
RequestParams params = new RequestParams();
params.put("photo", photo);
params.put("name", "woshishishi");//传输的字符数据
String url = "http://10.0.2.2:8080/IC_Server/servlet/RegisterServlet1";
AsyncHttpClient client = new AsyncHttpClient();
client.post(url, params, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, String content){
Toast.makeText(cont, "头像上传成功!"+content, 0)
.show();
}
@Override
public void onFailure(Throwable e, String data){
Toast.makeText(cont, "头像上传失败!", 0)
.show();
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
服务器中 serverlet中的代码：
package uestc.app.ic.server.servlet;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sun.misc.BASE64Decoder;
public class RegisterServlet1 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
response.setContentType("text/html");
String photo = request.getParameter("photo");
String name = request.getParameter("name");
try {
// 对base64数据进行解码 生成 字节数组，不能直接用Base64.decode（）；进行解密
byte[] photoimg = new BASE64Decoder().decodeBuffer(photo);
for (int i = 0; i < photoimg.length; ++i) {
if (photoimg[i] < 0) {
// 调整异常数据
photoimg[i] += 256;
}
}
// byte[] photoimg = Base64.decode(photo);//此处不能用Base64.decode（）方法解密，我调试时用此方法每次解密出的数据都比原数据大 所以用上面的函数进行解密，在网上直接拷贝的，花了好几个小时才找到这个错误（菜鸟不容易啊）
System.out.println("图片的大小：" + photoimg.length);
File file = new File("e:", "decode.png");
File filename = new File("e:\\name.txt");
if (!filename.exists()) {
file.createNewFile();
}
if (!file.exists()) {
file.createNewFile();
}
FileOutputStream out = new FileOutputStream(file);
FileOutputStream out1 = new FileOutputStream(filename);
out1.write(name.getBytes());
out.write(photoimg);
out.flush();
out.close();
out1.flush();
out1.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
延伸：
之前做上传图片是采用HttpServlet上传，不过用了一下Base64上传图片后，感觉比HttpServlet方便很多，大家也可以跟着尝试一下。
前台图片处理：（传Bitmap对象即可）
/**
* 通过Base32将Bitmap转换成Base64字符串
* @param bit
* @return
*/
public String Bitmap2StrByBase64(Bitmap bit){
ByteArrayOutputStream bos=new ByteArrayOutputStream();
bit.compress(CompressFormat.JPEG, 40, bos);//参数100表示不压缩
byte[] bytes=bos.toByteArray();
return Base64.encodeToString(bytes, Base64.DEFAULT);
}
前台发送数据：（調用setImgByStr()方法，第一個參數imgStr 为Bitmap转成Base64的字符串，第二个参数imgName为图片的名字，包含后缀名.jpg）
public static String host = "http://192.168.1.166:8080/ImageServer/";
public static String getContent(String url) throws Exception {
StringBuilder sb = new StringBuilder();
HttpClient client = new DefaultHttpClient();
HttpParams httpParams = client.getParams();
// 设置网络超时参数
HttpConnectionParams.setConnectionTimeout(httpParams, 3000);
HttpConnectionParams.setSoTimeout(httpParams, 5000);
HttpResponse response = client.execute(new HttpGet(url));
HttpEntity entity = response.getEntity();
if (entity != null) {
BufferedReader reader = new BufferedReader(new InputStreamReader(
entity.getContent(), "UTF-8"), 8192);
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
reader.close();
}
return sb.toString();
}
public static HttpResponse post(Map<String, Object> params, String url) {
HttpClient client = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader("charset", HTTP.UTF_8);
httpPost.setHeader("Content-Type",
"application/x-www-form-urlencoded; charset=utf-8");
HttpResponse response = null;
if (params != null && params.size() > 0) {
List<NameValuePair> nameValuepairs = new ArrayList<NameValuePair>();
for (String key : params.keySet()) {
nameValuepairs.add(new BasicNameValuePair(key, (String) params
.get(key)));
}
try {
httpPost.setEntity(new UrlEncodedFormEntity(nameValuepairs,
HTTP.UTF_8));
response = client.execute(httpPost);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (RuntimeException e) {
e.printStackTrace();
}
} else {
try {
response = client.execute(httpPost);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return response;
}
public static Object getValues(Map<String, Object> params, String url) {
String token = "";
HttpResponse response = post(params, url);
if (response != null) {
try {
token = EntityUtils.toString(response.getEntity());
response.removeHeaders("operator");
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return token;
}
public static Object setImgByStr(String imgStr,String imgName){
String url = host+"channel-uploadImage.action";
Map<String,Object> params = new HashMap<String, Object>();
params.put("imgStr", imgStr);
params.put("imgName", imgName);
return getValues(params, url);
}
后台接收数据：
public void uploadPhoto() {
//获取存储路径
HttpServletRequest request = ServletActionContext.getRequest();
String path = ServletActionContext.getServletContext().getRealPath("/")+"upload";
File file = new File(path);
if(!file.exists()){
file.mkdir();
}
String imgPath = path + request.getParameter("imgName");
String imgStr = request.getParameter("imgStr");
boolean flag = string2Image(imgStr, imgPath);
JacksonUtil.responseJSON(response, flag);
}
后台图片处理：
/**
* 通过BASE64Decoder解码，并生成图片
* @param imgStr 解码后的string
*/
public boolean string2Image(String imgStr, String imgFilePath) {
// 对字节数组字符串进行Base64解码并生成图片
if (imgStr == null)
return false;
try {
// Base64解码
byte[] b = new BASE64Decoder().decodeBuffer(imgStr);
for (int i = 0; i < b.length; ++i) {
if (b[i] < 0) {
// 调整异常数据
b[i] += 256;
}
}
// 生成Jpeg图片
OutputStream out = new FileOutputStream(imgFilePath);
out.write(b);
out.flush();
out.close();
return true;
} catch (Exception e) {
return false;
}
}
OK ! 如果成功上传前端会接收到true ，反之失败false。希望对大家有所帮助！