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：
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/**
* 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 = "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( "请求返回:" + state + "(" + url + ")" );
}
} finally {
if (response != null) {
try {
response.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
try {
httpclient.close();
} catch (ioexception e) {
e.printstacktrace();
}
}
return null;
}
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2、用于发送key-value格式的参数
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/**
* 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<namevaluepair> nvps = new arraylist<namevaluepair>();
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) { //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;
}
}
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第三，发送get请求
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/**
* 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;
}
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以上所述是小编给大家介绍的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，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：https://blog.csdn.net/xzj80927/article/details/89098334