java post json请求_java模拟post请求发送json
java模拟post请求发送json，用两种方式实现，第一种是HttpURLConnection发送post请求，第二种是使用httpclient模拟post请求。
方法一：
public staticString sendPost(String url_param, String param) {
String result= "";//返回的结果
BufferedReader in = null;//读取响应输入流//PrintWriter out = null;
try{//创建URL对象
URL url = newURL(url_param);//打开URL连接
java.net.HttpURLConnection httpConn =(java.net.HttpURLConnection) url
.openConnection();//设置属性
httpConn.setRequestProperty("Content-Type","application/json");//设置POST方式
httpConn.setDoInput(true);
httpConn.setDoOutput(true);
httpConn.setRequestMethod("POST");
httpConn.setUseCaches(false);
httpConn.setInstanceFollowRedirects(true);//获取HttpURLConnection对象对应的输出流
DataOutputStream out = newDataOutputStream(httpConn.getOutputStream());
out.write(param.getBytes("utf-8"));//flush输出流的缓冲
out.flush();
out.close();//定义BufferedReader输入流来读取URL的响应，设置编码方式
in = new BufferedReader(newInputStreamReader(httpConn
.getInputStream(),"UTF-8"));
String line;//读取返回的内容
while ((line = in.readLine()) != null) {
result+=line;
}
}catch(Exception e) {
e.printStackTrace();
}finally{try{/*if (out != null) {
out.close();
}*/
if (in != null) {
in.close();
}
}catch(IOException ex) {
ex.printStackTrace();
}
}returnresult;
}
方法二：
public String sendPost(String url, String data) {
String response = null;
log.info("url: " + url);
log.info("request: " + data);
try {
CloseableHttpClient httpclient = null;
CloseableHttpResponse httpresponse = null;
try {
httpclient = HttpClients.createDefault();
HttpPost httppost = new HttpPost(url);
StringEntity stringentity = new StringEntity(data,
ContentType.create("text/json", "UTF-8"));
httppost.setEntity(stringentity);
httpresponse = httpclient.execute(httppost);
response = EntityUtils
.toString(httpresponse.getEntity());
log.info("response: " + response);
} finally {
if (httpclient != null) {
httpclient.close();
}
if (httpresponse != null) {
httpresponse.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
return response;
}