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本篇文章給大家分享的是有關(guān)怎么在Java中發(fā)送post，小編覺(jué)得挺實(shí)用的，因此分享給大家學(xué)習(xí)，希望大家閱讀完這篇文章后可以有所收獲，話不多說(shuō)，跟著小編一起來(lái)看看吧。
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1、post請(qǐng)求用于發(fā)送json 格式的參數(shù)：
/**
* post請(qǐng)求（用于請(qǐng)求json格式的參數(shù)）
*
* @param url 地址
* @param params json格式的參數(shù)
* @return
*/
public static String doPost(String url, String params) throws Exception {
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost( url );// 創(chuàng)建httpPost
httpPost.setHeader( "Accept", "application/json" );
httpPost.setHeader( "Content-Type", "application/json" );
String charSet = "UTF-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( "請(qǐng)求返回:" + state + "(" + url + ")" );
}
} finally {
if (response != null) {
try {
response.close();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}2、用于發(fā)送key-value格式的參數(shù)
/**
* post請(qǐng)求(用于key-value格式的參數(shù))
*
* @param url
* @param params
* @return
*/
public static String doPost(String url, Map params) {
BufferedReader in = null;
try {
// 定義HttpClient
HttpClient client = new DefaultHttpClient();
// 實(shí)例化HTTP方法
HttpPost request = new HttpPost();
request.setURI( new URI( url ) );
//設(shè)置參數(shù)
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 BasicNameValuePair( 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) { //請(qǐng)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( "狀態(tài)碼：" + code );
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
} 第三，發(fā)送get請(qǐng)求
/**
* get請(qǐng)求
*
* @return
*/
public static String doGet(String url) {
try {
HttpClient client = new DefaultHttpClient();
//發(fā)送get請(qǐng)求
HttpGet request = new HttpGet( url );
HttpResponse response = client.execute( request );
/**請(qǐng)求發(fā)送成功，并得到響應(yīng)**/
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
/**讀取服務(wù)器返回過(guò)來(lái)的json字符串?dāng)?shù)據(jù)**/
String strResult = EntityUtils.toString( response.getEntity() );
return strResult;
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}Java的特點(diǎn)有哪些
Java的特點(diǎn)有哪些 1.Java語(yǔ)言作為靜態(tài)面向?qū)ο缶幊陶Z(yǔ)言的代表，實(shí)現(xiàn)了面向?qū)ο罄碚摚试S程序員以?xún)?yōu)雅的思維方式進(jìn)行復(fù)雜的編程。 2.Java具有簡(jiǎn)單性、面向?qū)ο蟆⒎植际健踩浴⑵脚_(tái)獨(dú)立與可移植性、動(dòng)態(tài)性等特點(diǎn)。 3.使用Java可以編寫(xiě)桌面應(yīng)用程序、Web應(yīng)用程序、分布式系統(tǒng)和嵌入式系統(tǒng)應(yīng)用程序等。
以上就是怎么在Java中發(fā)送post，小編相信有部分知識(shí)點(diǎn)可能是我們?nèi)粘９ぷ鲿?huì)見(jiàn)到或用到的。希望你能通過(guò)這篇文章學(xué)到更多知識(shí)。更多詳情敬請(qǐng)關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
文章名稱(chēng)：怎么在Java中發(fā)送post
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