HttpClient 模拟发送Post和Get请求 并用fastjson对返回json字符串数据解析，和HttpClient一些参数方法的deprecated（弃用）的综合总结

最近在做一个接口调用的时候用到Apache的httpclient时候，发现引入最新版本4.5，DefaultHttpClient等老版本常用的类已经过时了，不推荐使用了；去官网看了一下在4.3之后就抛弃了。

可以参考：

①点击此处详情 推荐使用 CloseableHttpClient

②点击此处详情 设置过时参数等类也已经在4.3过后不推荐使用

DefaultHttpClient --> CloseableHttpClient

HttpClient httpClient=new DefaultHttpClient(); --> CloseableHttpClient httpClient = HttpClients.createDefault();

HttpResponse --> CloseableHttpResponse

HttpResponse httpResponse = httpClient.execute(httpPost); --> CloseableHttpResponse httpResponse = httpClient.execute(httpPost);

---

Post请求

/**
     * Post方式 得到JSONObject
     *
     * @param paramsHashMap post参数
     * @param url
     * @param encoding 编码utf-8
     * @return
     */
    public JSONObject getJSONObjectByPost(Map<String, String> paramsHashMap, String url, String encoding) {
        //创建httpClient连接
        CloseableHttpClient httpClient = HttpClients.createDefault();

        JSONObject result = null;
　　　　//json方式 
　　　　//JSONObject jsonParam = new JSONObject(); 
　　　　//jsonParam.put("name", "admin"); 
　　　　//jsonParam.put("pass", "123456"); 
　　　　//StringEntity entity = new StringEntity(jsonParam.toString(),"utf-8");
　　　　//解决中文乱码问题 
　　　　//entity.setContentEncoding("UTF-8"); 
　　　　//entity.setContentType("application/json"); 
　　　　//httpPost.setEntity(entity);

　　　　//表单方式
        List<NameValuePair> nameValuePairArrayList = new ArrayList<NameValuePair>();
        // 将传过来的参数添加到List<NameValuePair>中
        if (paramsHashMap != null && !paramsHashMap.isEmpty()) {
            //遍历map
            for (Map.Entry<String, String> entry : paramsHashMap.entrySet()) {
                nameValuePairArrayList.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }
        }
　　　　　try {
            // 利用List<NameValuePair>生成Post请求的实体数据
            HttpPost httpPost = new HttpPost(url);
            // 为HttpPost设置实体数据 UrlEncodedFormEntity 把输入数据编码成合适的内容
         　　httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairArrayList, encoding));
            // HttpClient 发送Post请求
            CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
            if (httpResponse.getStatusLine().getStatusCode() == 200) {
                // CloseableHttpResponse
                HttpEntity httpEntity = httpResponse.getEntity();
                if (httpEntity != null) {
                    BufferedReader reader = null;
                    try {
                        reader = new BufferedReader(new InputStreamReader(httpEntity.getContent(), "UTF-8"), 10 * 1024);
                        StringBuilder strBuilder = new StringBuilder();
                        String line = null;
                        while ((line = reader.readLine()) != null) {
                            strBuilder.append(line);
                        }
                        // 用fastjson的JSON将返回json字符串转为json对象
                        result = JSON.parseObject(strBuilder.toString());
                    } catch (Exception e) {
                        e.printStackTrace();
                    } finally {
                        if (reader != null) {
                            try {
                                //关闭流
                                reader.close();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

Get请求

public JSONObject getJSONObjectByGet(String url){
        JSONObject resultJsonObject=null;

        //创建httpClient连接
        CloseableHttpClient httpClient = HttpClients.createDefault();

        StringBuilder urlStringBuilder=new StringBuilder(url);
        StringBuilder entityStringBuilder=new StringBuilder();
        //利用URL生成一个HttpGet请求
        HttpGet httpGet=new HttpGet(urlStringBuilder.toString());
        // HttpClient 发送Post请求
        CloseableHttpResponse httpResponse = null;
        try {
            httpResponse=httpClient.execute(httpGet);
        } catch (Exception e) {
            e.printStackTrace();
        }
        //得到httpResponse的状态响应码
        if (httpResponse.getStatusLine().getStatusCode()== HttpStatus.SC_OK) {
            //得到httpResponse的实体数据
            HttpEntity httpEntity=httpResponse.getEntity();
            if (httpEntity!=null) {
                BufferedReader reader=null;
                try {
                    reader=new BufferedReader(new InputStreamReader(httpEntity.getContent(), "UTF-8"), 8*1024);
                    String line=null;
                    while ((line=reader.readLine())!=null) {
                        entityStringBuilder.append(line);
                    }
                    // 从HttpEntity中得到的json String数据转为json
                    String json=entityStringBuilder.toString();
                    resultJsonObject=JSON.parseObject(json);
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    if (reader != null) {
                        try {
                            //关闭流
                            reader.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
        return resultJsonObject;
    }

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