java版，微信公众平台新手入门第四节

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java版微信公众平台开发

public void addUpLoad(HttpServletRequest request,HttpServletResponse response) {
UrlRequestUtil uu = new UrlRequestUtil();
String url = "http://api.weixin.qq.com/cgi-bin/material/add_material?access_token=";
JSONObject jo = new JSONObject();
try {
net.sf.json.JSON json = uu.addMaterial("image", control.getAccessToken().getToken(), new File("D:\\test2.jpg"),url);
jo = JSON.parseObject(json.toString());
System.out.println(jo);
System.out.println("media_id:"+jo.getString("media_id"));
System.out.println("errcode:"+jo.getString("errcode"));
System.out.println("url: "+jo.getString("url"));
} catch (Exception e) {
System.out.println("上传素材失败");
}
super.writeJson(jo.toString(),response);
}
public net.sf.json.JSONObject addMaterial(String fileType,Stringaccess_token,File file,String url) throws Exception{
String result = null;
net.sf.json.JSONObject jsonObj = null;
if (!file.exists() ||!file.isFile()) {
throw new IOException("文件不存在");
}
URL urlObj = new URL(url+access_token+"&type="+fileType);
// 连接
HttpURLConnection con = (HttpURLConnection)urlObj.openConnection();
con.setRequestMethod("POST"); // 以Post方式提交表单，默认get方式
con.setDoInput(true);
con.setDoOutput(true);
con.setUseCaches(false); // post方式不能使用缓存
con.setRequestProperty("Connection", "Keep-Alive");
con.setRequestProperty("Charset", "UTF-8");
// 设置边界
String BOUNDARY = "----" + System.currentTimeMillis();
con.setRequestProperty("Content-Type", "multipart/form-data;boundary="+ BOUNDARY);
StringBuilder sb = newStringBuilder();
sb.append("--"); // 必须多两道线
sb.append(BOUNDARY);
sb.append("\r\n");
sb.append("Content-Disposition:form-data;name="media";");
sb.append("filelength=""+file.length()+"";" +"filename="" + file.getName()+ ""\r\n");
sb.append("Content-Type:application/octet-stream\r\n\r\n");
byte[] head =sb.toString().getBytes("utf-8");
// 获得输出流
OutputStream out = newDataOutputStream(con.getOutputStream());
// 输出表头
out.write(head);
// 文件正文部分
// 把文件已流文件的方式推入到url中
DataInputStream in = new DataInputStream(newFileInputStream(file));
int bytes = 0;
byte[] bufferOut = new byte[1024];
while ((bytes =in.read(bufferOut)) != -1) {
out.write(bufferOut, 0, bytes);
}
in.close();
// 结尾部分
byte[] foot = ("\r\n--" + BOUNDARY + "--\r\n").getBytes("utf-8");// 定义最后数据分隔线
out.write(foot);
out.flush();
out.close();
StringBuffer buffer= new StringBuffer();
BufferedReaderreader = null;
try {
// 定义BufferedReader输入流来读取URL的响应
reader = new BufferedReader(newInputStreamReader(con.getInputStream()));
String line = null;
while ((line =reader.readLine()) != null) {
buffer.append(line);
}
if(result==null){
result = buffer.toString();
}
} catch (IOException e){
System.out.println("发送POST请求出现异常！" + e);
e.printStackTrace();
throw new IOException("数据读取异常");
} finally {
if(reader!=null){reader.close();}
jsonObj = net.sf.json.JSONObject.fromObject(result);
}
return jsonObj;
}