微信公众号二次开发

1、微信公众号取过来的昵称、地区、城市乱码问题

get请求，读取数据的时候，指定编码 UTF-8
in = new BufferedReader(new InputStreamReader( connection.getInputStream(), "utf-8"));

public static String sendGet(String url,String param) throws Exception{

String result = "";
BufferedReader in = null;
try {
String urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map<String, List<String>> map = connection.getHeaderFields();
// 遍历所有的响应头字段
for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
connection.getInputStream(),"UTF-8"));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}

return result;
}

　　2、回复图片消息的时候，必须POST方式调用接口：

https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=ACCESS_TOKEN

文档网址：https://mp.weixin.qq.com/wiki/7/12a5a320ae96fecdf0e15cb06123de9f.html#.E5.8F.91.E9.80.81.E5.9B.BE.E7.89.87.E6.B6.88.E6.81.AF

/**
* 向指定 URL 发送POST方法的请求
*
* @param url
*            发送请求的 URL
* @param param
*            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, String param) {

PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！"+e);
e.printStackTrace();
}
//使用finally块来关闭输出流、输入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}
catch(IOException ex){
ex.printStackTrace();
}
}
return result;
}

　　

//回复图片
String url="https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token="+ACCESS_TOKEN;
String json="{\"touser\": \""+openid+"\", \"msgtype\": \"image\", \"image\": {\"media_id\": \""+mediaId+"\"}}";

String reply= UrlHttpUtil.sendPost(url, json);
System.out.println(reply);
System.out.println(userinfo.getNickname());

　　3、如果回复图片消息，需先上传永久素材，返回mediaId（opentId就是fromUserName）

/**
* 微信服务器素材上传
* @param file  表单名称media
* @param token access_token
* @param type  type只支持四种类型素材(video/image/voice/thumb)
*/
public static JSONObject uploadMedia(File file, String token, String type) {
if(file==null||token==null||type==null){
return null;
}

if(!file.exists()){
// logger.info("上传文件不存在,请检查!");
return null;
}

//临时素材地址
//String url = "http://file.api.weixin.qq.com/cgi-bin/media/upload";
String url="https://api.weixin.qq.com/cgi-bin/material/add_material";

JSONObject jsonObject = null;
PostMethod post = new PostMethod(url);
post.setRequestHeader("Connection", "Keep-Alive");
post.setRequestHeader("Cache-Control", "no-cache");
FilePart media = null;
HttpClient httpClient = new HttpClient();
//信任任何类型的证书
//Protocol myhttps = new Protocol("https", new MySSLProtocolSocketFactory(), 443);
// Protocol.registerProtocol("https", myhttps);

try {
media = new FilePart("media", file);
Part[] parts = new Part[] { new StringPart("access_token", token),
new StringPart("type", type), media };
MultipartRequestEntity entity = new MultipartRequestEntity(parts,
post.getParams());
post.setRequestEntity(entity);
int status = httpClient.executeMethod(post);
if (status == HttpStatus.SC_OK) {
String text = post.getResponseBodyAsString();
jsonObject = JSONObject.fromObject(text);
} else {
// logger.info("upload Media failure status is:" + status);
}
} catch (FileNotFoundException execption) {

} catch (HttpException execption) {

} catch (IOException execption) {

}
return jsonObject;
}