一，准备util类
public class WXUtils {
//获取token信息
public static String getToken(String tokenUrl,String wxappid,String wxappsecret) throws ClientProtocolException,IOException {
String access_token = null;
String tokenUrlReq = tokenUrl.replaceAll("WXAPPID", wxappid).replaceAll("WXAPPSECRET", wxappsecret);
HttpGet httpGet = new HttpGet(tokenUrlReq);
HttpClient httpClient = HttpClients.createDefault();
HttpResponse res = httpClient.execute(httpGet);
HttpEntity entity = res.getEntity();
String result = EntityUtils.toString(entity, "UTF-8");
JSONObject jsons = JSONObject.fromObject(result);
String expires_in = jsons.getString("expires_in");
//缓存
if(Integer.parseInt(expires_in)==7200){
//ok
access_token = jsons.getString("access_token");
}else{
System.out.println("出错获取token失败！");
}
return access_token;
}
}
获取access_token ：
String access_token = WXUtils.getToken(tokenUrl, wxappid, wxappsecret);
String qrCode = centerCode+'_'+autoGenericCode(i+"",3);（生成的个数可以for循环，主要方法是autoGenericCode（）方法，其它为区分标识）
/**
*autoGenericCode
* 不够位数的在前面补0，保留num的长度位数字* @param code
* @return
*/
private String autoGenericCode(String code, int num) {
String result = "";
result = String.format("%0" + num + "d", Integer.parseInt(code) );
return result;
}
//GetPostUrl
public String GetPostUrl(String access_token,String centerCode,String qrCode) throws Exception {
String url = createcodeUrl+access_token;
Map<String,Object> param = new HashMap<String, Object>();
param.put("scene", qrCode);
param.put("page", qrcodePage); //qrcodePage为指定的跳转页面
param.put("width", 430);
param.put("auto_color", false);
Map<String,Object> line_color = new HashMap<String, Object>();
line_color.put("r", 0);
line_color.put("g", 0);
line_color.put("b", 0);
param.put("line_color", line_color);
JSONObject json = JSONObject.fromObject(param);
String res = httpPostWithJSON(url,json.toString(),centerCode,qrCode);
return res;
}
//返回图片保存 ，根据 id
public String httpPostWithJSON(String url, String json,String centerCode,String qrCode) throws Exception {
//生成二维码编号区别
String nowTime = DateUtils.getDateTimeNoFormat();
String fileName = qrCode+"_"+nowTime+".png";
String filePath = imageRootPath+"/"+qrcodePath+"/";
String result = fileName;
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
httpPost.addHeader("Content-Type", "application/json");
StringEntity se = new StringEntity(json);
se.setContentType("application/json");
se.setContentEncoding(new BasicHeader("Content-Type", "UTF-8"));
httpPost.setEntity(se);
CloseableHttpResponse response = httpClient.execute(httpPost);
if (response != null) {
org.apache.http.HttpEntity resEntity = response.getEntity();
if(resEntity != null) {
InputStream instreams = resEntity.getContent();
File saveFile = new File(filePath+fileName);
// 判断这个文件（saveFile）是否存在
if (!saveFile.getParentFile().exists()) {
// 如果不存在就创建这个文件夹
saveFile.getParentFile().mkdirs();
}
saveToImgByInputStream(instreams, filePath,fileName);
}
}
httpPost.abort();
return result;
}
/* @param instreams 二进制流
* @param imgPath 图片的保存路径
* @param imgName 图片的名称
* @return
* 1：保存正常
* 0：保存失败
*/
public static int saveToImgByInputStream(InputStream instreams,String imgPath,String imgName){
int stateInt = 1;
ByteArrayOutputStream outStream = null;
FileOutputStream fos = null;
if(instreams != null){
try {
outStream = new ByteArrayOutputStream();
//创建一个Buffer字符串
byte[] buffer = new byte[1024];
//每次读取的字符串长度，如果为-1，代表全部读取完毕
int len = 0;
//使用一个输入流从buffer里把数据读取出来
while( (len=instreams.read(buffer)) != -1 ){
//用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
outStream.write(buffer, 0, len);
}
//关闭输入流
//instreams.close();
//把outStream里的数据写入内存
byte[] data = outStream.toByteArray();
File file = new File(imgPath+imgName);//可以是任何图片格式.jpg,.png等
fos = new FileOutputStream(file);
fos.write(data);
fos.flush();
} catch (Exception e) {
stateInt = 0;
e.printStackTrace();
} finally {
try {
if(fos!=null){
fos.close();
}
if(outStream!=null){
outStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
return stateInt;
}