Java发送post方法详解

Java发送post方法详解

总结一下java使用http发送post的方法：

1、post请求用于发送json 格式的参数：

/**

* post请求（用于请求json格式的参数）

*

* @param url 地址

* @param params json格式的参数

* @return

*/

public static String doPost(String url, String params) throws Exception {

CloseableHttpClient httpclient = HttpClients.createDefault();

HttpPost httpPost = new HttpPost( url );// 创建httpPost

httpPost.setHeader( "Accept", "application/json" );

httpPost.setHeader( "Content-Type", "application/json" );

String charSet = "UTFjlreBMuvyw-8";

StringEntity entity = new StringEntity( params, charSet );

httpPost.setEntity( entity );

CloseableHttpResponse response = null;

try {

response = httpclient.execute( httpPost );

StatusLine status = response.getStatusLine();

int state = status.getStatusCode();

if (state == HttpStatus.SC_OK) {

HttpEntity responseEntity = response.getEntity();

String jsonString = EntityUtils.toString( responseEntity );

return jsonString;

} else {

logger.error( "请求返回:" + state + "(" + url + ")" );

}

} finally {

if (response != null) {

try {

response.close();

} catch (IOException e) {

e.printStackTrace();

}

}

try {

httpclient.close();

} catch (IOException e) {

jlreBMuvywe.printStackTrace();

}

}

return null;

}

2、用于发送key-value格式的参数

/**

* post请求(用于key-value格式的参数)

*

* @param url

* @param params

* @return

*/

public static String doPost(String url, Map params) {

BufferedReader in = null;

try {

// 定义HttpClient

HttpClient client = new DefaultHttpClient();

// 实例化HTTP方法

HttpPost request = new HttpPost();

request.setURI( new URI( url ) );

//设置参数

List nvps = new ArrayList();

for (Iterator iter = params.keySet().iterator(); iter.hasNext(); ) {

String name = (String) iter.next();

String value = String.valueOf( params.get( name ) );

nvps.add( new BasicNameValuePajlreBMuvywir( name, value ) );

//System.out.println(name +"-"+value);

}

request.setEntity( new UrlEncodedFormEntity( nvps, HTTP.UTF_8 ) );

HttpResponse response = client.execute( request );

int code = response.getStatusLine().getStatusCode();

if (code == 200) { //请求成功

in = new BufferedReader( new InputStreamReader( response.getEntity()

.getContent(), "utf-8" ) );

StringBuffer sb = new StringBuffer( "" );

String line = "";

String NL = System.getProperty( "line.separator" );

while ((line = in.readLine()) != null) {

sb.append( line + NL );

}

in.close();

return sb.toString();

} else { //

System.out.println( "状态码：" + code );

return null;

}

} catch (Exception e) {

e.printStackTrace();

return null;

}

}

第三，发送get请求

/**

* get请求

*

* @return

*/

public static String doGet(String url) {

try {

HttpClient client = new DefaultHttpClient();

//发送get请求

HttpGet request = new HttpGet( url );

HttpResponse response = client.execute( request );

/**请求发送成功，并得到响应**/

if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {

/**读取服务器返回过来的json字符串数据**/

String strResult = EntityUtils.toString( response.getEntity() );

return strResult;

}

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

以上所述是给大家介绍的Java发送post方法详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，会及时回复大家的。在此也非常感谢大家对我们网站的支持！

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