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Android 通过Base64上传图片到服务器实现实例

2019年07月24日  | 移动技术网IT编程  | 我要评论

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android 通过base64上传图片到服务器

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！

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