package
com.gist.utils;
import
java.io.File;
import
java.io.FileInputStream;
import
java.io.FileOutputStream;
import
java.io.IOException;
import
java.io.InputStreamReader;
import
java.net.URL;
import
javax.net.ssl.HttpsURLConnection;
import
com.gist.bean.Access_token;
import
com.google.gson.Gson;
/**
* 编写时期 2016-4-7 下午5:44:33
*/
public
class
AccessTokenUtils {
private
static
final
long
MAX_TIME =
7200
*
1000
;
// 微信允许最长Access_token有效时间(ms)
private
static
final
String TAG =
"WeixinApiTest"
;
// TAG
private
static
final
String APPID =
"wx889b020b3666b0b8"
;
// APPID
private
static
final
String SECERT =
"6da7676bf394f0a9f15fbf06027856bb"
;
// 秘钥
/*
* 该方法实现获取Access_token、保存并且只保存2小时Access_token。如果超过两个小时重新获取;如果没有超过两个小时,直接获取。该方法依赖
* :public static String getAccessToken();
*
* 思路:将获取到的Access_token和当前时间存储到file里,
* 取出时判断当前时间和存储里面的记录的时间的时间差,如果大于MAX_TIME,重新获取,并且将获取到的存储到file替换原来的内容
* ,如果小于MAX_TIME,直接获取。
*/
// 为了调用不抛异常,这里全部捕捉异常,代码有点长
public static String getSavedAccess_token() {
Gson gson = new Gson();// 第三方jar,处理json和bean的转换
String mAccess_token = null;// 需要获取的Access_token;
FileOutputStream fos = null;// 输出流
FileInputStream fis = null;// 输入流
File file = new File("temp_access_token.temp");// Access_token保存的位置
try {
// 如果文件不存在,创建
if (!file.exists()) {
file.createNewFile();
}
} catch (Exception e1) {
e1.printStackTrace();
}
// 如果文件大小等于0,说明第一次使用,存入Access_token
if (file.length() == 0) {
try {
mAccess_token = getAccessToken();// 获取AccessToken
Access_token at = new Access_token();
at.setAccess_token(mAccess_token);
at.setExpires_in(System.currentTimeMillis() + "");// 设置存入时间
String json = gson.toJson(at);
fos = new FileOutputStream(file, false);// 不允许追加
fos.write((json).getBytes());// 将AccessToken和当前时间存入文件
fos.close();
return mAccess_token;
} catch (Exception e) {
e.printStackTrace();
}
} else {
// 读取文件内容
byte[] b = new byte[2048];
int len = 0;
try {
fis = new FileInputStream(file);
len = fis.read(b);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
String mJsonAccess_token = new String(b, 0, len);// 读取到的文件内容
Access_token access_token = gson.fromJson(mJsonAccess_token,
new Access_token().getClass());
if (access_token.getExpires_in() != null) {
long saveTime = Long.parseLong(access_token.getExpires_in());
long nowTime = System.currentTimeMillis();
long remianTime = nowTime - saveTime;
// System.out.println(TAG + "时间差:" + remianTime + "ms");
if (remianTime < MAX_TIME) {
Access_token at = gson.fromJson(mJsonAccess_token,
new Access_token().getClass());
mAccess_token = at.getAccess_token();
return mAccess_token;
} else {
mAccess_token = getAccessToken();
Access_token at = new Access_token();
at.setAccess_token(mAccess_token);
at.setExpires_in(System.currentTimeMillis() + "");
String json = gson.toJson(at);
try {
fos = new FileOutputStream(file, false);// 不允许追加
fos.write((json).getBytes());
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return mAccess_token;
}
} else {
return null;
}
}
return mAccess_token;
}
/*
* 获取微信服务器AccessToken。该部分和getAccess_token() 一致,不再加注释
*/
public
static
String getAccessToken() {
+ APPID +
"&secret="
+ SECERT;
String reslut =
null
;
try
{
URL reqURL =
new
URL(urlString);
HttpsURLConnection httpsConn = (HttpsURLConnection) reqURL
.openConnection();
InputStreamReader isr =
new
InputStreamReader(
httpsConn.getInputStream());
char
[] chars =
new
char
[
1024
];
reslut =
""
;
int
len;
while
((len = isr.read(chars)) != -
1
) {
reslut +=
new
String(chars,
0
, len);
}
isr.close();
}
catch
(IOException e) {
e.printStackTrace();
}
Gson gson =
new
Gson();
Access_token access_token = gson.fromJson(reslut,
new
Access_token().getClass());
if
(access_token.getAccess_token() !=
null
) {
return
access_token.getAccess_token();
}
else
{
return
null
;
}
}
}