json实战

备忘录：

1、/wechat/src/main/java/com/innfee/web/weixin/util/WeixinUtil.java

这个文件用到JSONObject

/**
     * 文件上传到微信服务器
     * @param fileType 文件类型
     * @param filePath 文件路径
     * @return JSONObject
     * @throws Exception
     */
	public static JSONObject mediaUpload(String fileType, String filePath) throws Exception {
		String result = null;
		File file = new File(filePath);
		if (!file.exists() || !file.isFile()) {
			throw new IOException("文件不存在");
		}
		/**
		 * 第一部分
		 */
		URL urlObj = new URL("http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token="+ getAccessToken() + "&type=" + fileType + "");
		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
		// 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("\r\n");
		sb.append("Content-Disposition: form-data;name=\"file\";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 = 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 = ("\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();
		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) {
				System.out.println(line);
				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;
	}

 2、JSONObject转化为JavaBean

    public static boolean groupsProcess(Map map, String url, String type, Object resultObj) { 
    	String json = "";
    	JSONObject jsonObject = null;
    	if(map!=null){
            JSONObject jsonObjectReq = JSONObject.fromObject( map );
            json = jsonObjectReq.toString();
            jsonObject = httpRequest(url, "POST", json);  
    	}else{
    		jsonObject = httpRequest(url, "POST", null);  
    	}
    	if(logger.isDebugEnabled()){
    		logger.debug("用户分组操作url:"+url+",参数json:"+json+",结果："+jsonObject);
    	}
        //返回结果
        if (null != jsonObject) {  
            if (jsonObject.get("errcode")!=null && 0 != jsonObject.getInt("errcode")) {  
                return false;
            }else{
            	//创建用户分组
            	if(GROUP_CREATE_URL_.equals(type)){
                	WxGroupBean2 rmGroupBean = (WxGroupBean2)JSONObject.toBean( jsonObject,WxGroupBean2.class );
                	if(rmGroupBean!=null && rmGroupBean.getGroup()!=null && rmGroupBean.getGroup().getId()!=null){
                    	Map groupMap = (Map)map.get("group");
                    	groupMap.put("id", rmGroupBean.getGroup().getId());
                	}
            	}else if(GROUP_GET_URL_.equals(type)){
            		WxGroupBeans wxGroupBeans = (WxGroupBeans)JSONObject.toBean( jsonObject,WxGroupBeans.class );
            		WxGroupBeans wgb = (WxGroupBeans)resultObj;
            		wgb.setGroups(wxGroupBeans.getGroups());
            	}
            	return true;
            }
        }  
        return false;  
    }  

 3、JSONObject里面元素的获取

public static int getMenu(String accessToken) {  
        int result = 0;  
        // 拼装查询菜单的url  
        String url = menu_get_url.replace("ACCESS_TOKEN", accessToken);  
        // 调用接口查询菜单  
        JSONObject jsonObject = httpRequest(url, "GET", null);  
      
        if (null != jsonObject) {  
            if (0 != jsonObject.getInt("errcode")) {  
                result = jsonObject.getInt("errcode");  
                logger.error("查询菜单失败 errcode:{} errmsg:{}", jsonObject.getInt("errcode"), jsonObject.getString("errmsg"));  
            }  
            logger.info("返回菜单："+jsonObject.toString());
        }  
      
        return result;  
    }