java中http的post和get请求，请求结果json转为对象或Map型

其中我们要把json转换为实体，需要用到如下jar：

com.fasterxml.jackson.core

1.POST

public void doPost(){

CloseableHttpClient client = HttpClients.createDefault();

CloseableHttpResponse resp =null;

try {

HttpPost post =new HttpPost(URL);//URL为请求路径

post.addHeader("","");//添加头数据

List<NameValuePair> nvlist =new ArrayList<NameValuePair>();

nvlist.add(new BasicNameValuePair("title",title));//添加body数据

HttpEntity entity =new UrlEncodedFormEntity(nvlist,"UTF-8");

post.setEntity(entity);

resp = client.execute(post);

 

//接受返回的json串后转换为Map或实体类

InputStream is  =resp.getEntity().getContent();

BufferedReader reader =new BufferedReader(new InputStreamReader(is));      

StringBuilder sb =new StringBuilder();      

String temp ="";

while ((temp =reader.readLine()) !=null) {      

sb.append(temp);      

}      

    is.close();      

    ObjectMapper objectMapper =new ObjectMapper();

    Map<String,Object> map =objectMapper.readValue(sb.toString(), Map.class);//如果要转换为定义好的model类，Map换为类名

    

} catch (Exceptione) {

e.printStackTrace();

} finally {

close(resp);

close(client);

}

}

private static void close(CloseableHttpResponseresp) {

if (resp !=null) {

try {

resp.close();

} catch (Exceptione) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

 

private static void close(CloseableHttpClientclient) {

if (client !=null) {

try {

client.close();

} catch (Exceptione) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

2.GET（以获得日期类型接口为例）

/**

 * 请求接口获得日期类型（工作日对应结果为 0, 休息日对应结果为 1, 节假日对应的结果为 2）

 * @param date

 * @return

 */

private Integer getDateType(String date){

CloseableHttpClient client = HttpClients.createDefault();

CloseableHttpResponse resp = null;

try {

HttpGet get = new HttpGet("http://www.easybots.cn/api/holiday.php?d="+date);

resp = client.execute(get);

InputStream is  = resp.getEntity().getContent();

BufferedReader reader = new BufferedReader(new InputStreamReader(is));      

StringBuilder sb = new StringBuilder();      

String temp ="";

while ((temp = reader.readLine()) != null) {      

sb.append(temp);      

}      

    is.close();      

    ObjectMapper objectMapper = new ObjectMapper();

    Map<String,Object> map = objectMapper.readValue(sb.toString(), Map.class);

    return Integer.valueOf((String) map.get(date));

} catch (Exception e) {

e.printStackTrace();

} finally {

close(resp);

close(client);

}

return 0;

}

private static void close(CloseableHttpResponse resp) {

if (resp != null) {

try {

resp.close();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

 

private static void close(CloseableHttpClient client) {

if (client != null) {

try {

client.close();

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

3.http传json到服务器方法：

           HttpPost post = new HttpPost(URL);

String json = "{........}";          

StringEntity se = new StringEntity(json,"utf-8");
            se.setContentType("application/json");
            se.setContentEncoding("UTF-8");
            
            System.out.println("请求数据："+json);
            post.setEntity(se);
            resp = client.execute(post);