本工具类的功能：从微信服务器下载多媒体文件、上传多媒体文件，从远程地址下载图片到本地
public class MediaUtil {
/**
* 下载远程图片
*
* @param url
*/
public void saveRemoteImage(String url) {
InputStream inputStream = null;
try {
URL urlGet = new URL(url);
HttpURLConnection http = (HttpURLConnection) urlGet
.openConnection();
http.setRequestMethod("GET"); // 必须是get方式请求
http.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
http.setDoOutput(true);
http.setDoInput(true);
System.setProperty("sun.net.client.defaultConnectTimeout",
"30000");// 连接超时30秒
System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
http.connect();
// 获取文件转化为byte流
inputStream = http.getInputStream();
} catch (Exception e) {
e.printStackTrace();
}
String fname="D:\\"+System.currentTimeMillis()+".jpg";
byte\[\] data = new byte\[1024\];
int len = 0;
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream(fname);
while ((len = inputStream.read(data)) != -1) {
fileOutputStream.write(data, 0, len);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fileOutputStream != null) {
try {
fileOutputStream.close();
System.out.println(fname+"保存成功");
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
*
* 向微信服务器上传文件
*
*
*
* @param accessToken
*
* 进入的接口
*
* @param type
*
* 文件类型(语音或者是图片)(对于文档不适合)
*
* @param url
*
* 文件的存储路径
*
* @return json的格式{"media_id":
*
* "nrSKG2eY1E\_svLs0Iv2Vvh46PleKk55a47cNO1ZS5\_pdiNiSXuijbCmWWc8unzBQ"
*
* ,"created_at":1408436207,"type":"image"}
*/
public JSONObject uploadFile(String fileType, String filePath)
throws Exception {
String accessToken = "your token here";
// 上传文件请求路径
String action = "http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token="
+ accessToken + "&type=" + fileType;
URL url = new URL(action);
String result = null;
File file = new File(filePath);
if (!file.exists() || !file.isFile()) {
throw new IOException("上传的文件不存在");
}
HttpURLConnection con = (HttpURLConnection) url.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
// 设置请求头信息
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);
// 请求正文信息
// 第一部分：
StringBuilder sb = new StringBuilder();
sb.append("--"); // 必须多两道线
sb.append(BOUNDARY);
sb.append("
“);
sb.append("Content-Disposition: form-data;name="file";filename=""
+ file.getName() + ""
“);
sb.append("Content-Type:application/octet-stream
“);
byte\[\] head = sb.toString().getBytes("utf-8");
// 获得输出流
OutputStream out = new DataOutputStream(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(new FileInputStream(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 = ("
–” + BOUNDARY + “–
“).getBytes(“utf-8”);// 定义最后数据分隔线
out.write(foot);
out.flush();
out.close();
StringBuffer buffer = new StringBuffer();
BufferedReader reader = null;
try {
// 定义BufferedReader输入流来读取URL的响应
reader = new BufferedReader(new InputStreamReader(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();
}
}
JSONObject jsonObj = JSONObject.fromObject(result);
return jsonObj;
}
/**
* 根据文件id下载文件
*
* @param mediaId
* 媒体id
* @throws Exception
*/
public InputStream getInputStream(String mediaId) {
String accessToken = "your token here";
InputStream is = null;
String url = "http://file.api.weixin.qq.com/cgi-bin/media/get?access_token="
+ accessToken + "&media_id=" + mediaId;
try {
URL urlGet = new URL(url);
HttpURLConnection http = (HttpURLConnection) urlGet
.openConnection();
http.setRequestMethod("GET"); // 必须是get方式请求
http.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
http.setDoOutput(true);
http.setDoInput(true);
System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
http.connect();
// 获取文件转化为byte流
is = http.getInputStream();
} catch (Exception e) {
e.printStackTrace();
}
return is;
}
/**
* 获取下载图片信息（jpg）
*
* @param mediaId
* 文件的id
* @throws Exception
*/
public void saveImageToDisk(String mediaId) throws Exception {
InputStream inputStream = getInputStream(mediaId);
byte\[\] data = new byte\[1024\];
int len = 0;
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream("test1.jpg");
while ((len = inputStream.read(data)) != -1) {
fileOutputStream.write(data, 0, len);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (fileOutputStream != null) {
try {
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}