java后台访问url连接——HttpClients

java后台访问url,并传递数据——通过httpclient方式

需要的包,包可能多几个额外的,如果无用或者冲突删除即可,httpclient是使用的是4.4.1的版本:http://download.csdn.net/detail/myfmyfmyfmyf/8894191

1、无参数传递,以微信开发为例,后台访问url连接获得全部的人员列表

	/**
	 * 获取全部人员列表
	 * @return
	 */
    public  JSONObject getAllEmployee(){
    	//获取微信号
    	String token=getTokenFromWx();
    	 String dep_root=ROOT_DEP;//跟部门树
		 try {
			 CloseableHttpClient httpclient = HttpClients.createDefault();
			 HttpPost httpPost= new HttpPost("https://qyapi.weixin.qq.com/cgi-bin/user/list?access_token="+token+"&department_id="+dep_root+"&fetch_child="+FETCH_CHILD+"&status="+STATE);
			 // Create a custom response handler
			 ResponseHandler responseHandler = new ResponseHandler() {
				//成功调用连接后,对返回数据进行的操作
                public JSONObject handleResponse(
                        final HttpResponse response) throws ClientProtocolException, IOException {
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {
                    	//获得调用成功后  返回的数据
                        HttpEntity entity = response.getEntity();
                        if(null!=entity){
                        	String result= EntityUtils.toString(entity);
                            //根据字符串生成JSON对象
                   		 	JSONObject resultObj = JSONObject.fromObject(result);
                   		 	return resultObj;
                        }else{
                        	return null;
                        }
                    } else {
                        throw new ClientProtocolException("Unexpected response status: " + status);
                    }
                }

            };
          //返回的json对象
            JSONObject responseBody = httpclient.execute(httpPost, responseHandler);
            //System.out.println(responseBody);
            return responseBody; 
		 }catch (Exception e) {
			e.printStackTrace();
			return null;
		}       
    }


 

2、有参数传递,以微信开发为例,后台访问url主动发送消息(json数据),httpClient通过设置StringEntity对象传递

/**
  	 * 主动发送消息
  	 * @param mess
  	 * @return
  	 */
  	public  boolean sendReqMsg(ReqBaseMessage mess){
  		//消息json格式
  		String jsonContext=mess.toJsonStr();
  		//System.out.println(jsonContext);
  		//获得token
  		String token=getTokenFromWx();
		 boolean flag=false;
		 try {
			 CloseableHttpClient httpclient = HttpClients.createDefault();
			 HttpPost httpPost= new HttpPost("https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token="+token);
			 //发送json格式的数据
			 StringEntity myEntity = new StringEntity(jsonContext, 
					   ContentType.create("text/plain", "UTF-8"));
			 //设置需要传递的数据
			 httpPost.setEntity(myEntity);
			 // Create a custom response handler
            ResponseHandler responseHandler = new ResponseHandler() {
            	//对访问结果进行处理
                public JSONObject handleResponse(
                        final HttpResponse response) throws ClientProtocolException, IOException {
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {
                        HttpEntity entity = response.getEntity();
                        if(null!=entity){
                        	String result= EntityUtils.toString(entity);
                            //根据字符串生成JSON对象
                   		 	JSONObject resultObj = JSONObject.fromObject(result);
                   		 	return resultObj;
                        }else{
                        	return null;
                        }
                    } else {
                        throw new ClientProtocolException("Unexpected response status: " + status);
                    }
                }

            };
          //返回的json对象
            JSONObject responseBody = httpclient.execute(httpPost, responseHandler);
            System.out.println(responseBody);
            int result= (Integer) responseBody.get("errcode");
            if(0==result){
            	flag=true;
            }else{
            	flag=false;
            }
			httpclient.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		 return flag;
	}


3、传递图片、文件等媒体信息,还是以微信开发为例

/**
     * 文件上传到微信服务器
     * @param fileType 文件类型 媒体文件类型,分别有图片(image)、语音(voice)、视频(video),普通文件(file)
     * @param filePath 文件路径
     * @return JSONObject
     * @throws Exception
     */
    public  JSONObject send(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");  
        }  
        String token=getTokenFromWx();
        /** 
        * 第一部分 
        */  
        URL urlObj = new URL("https://qyapi.weixin.qq.com/cgi-bin/media/upload?access_token="+ token 
        		+ "&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=\"media\";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;  
    }


 

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