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）
*
*@paramurl地址
*@paramparamsjson格式的参数
*@return
*/
publicstaticStringdoPost(Stringurl,Stringparams)throwsException{
CloseableHttpClienthttpclient=HttpClients.createDefault();
HttpPosthttpPost=newHttpPost(url);//创建httpPost
httpPost.setHeader("Accept","application/json");
httpPost.setHeader("Content-Type","application/json");
StringcharSet="UTF-8";
StringEntityentity=newStringEntity(params,charSet);
httpPost.setEntity(entity);
CloseableHttpResponseresponse=null;
try{
response=httpclient.execute(httpPost);
StatusLinestatus=response.getStatusLine();
intstate=status.getStatusCode();
if(state==HttpStatus.SC_OK){
HttpEntityresponseEntity=response.getEntity();
StringjsonString=EntityUtils.toString(responseEntity);
returnjsonString;
}else{
logger.error("请求返回:"+state+"("+url+")");
}
}finally{
if(response!=null){
try{
response.close();
}catch(IOExceptione){
e.printStackTrace();
}
}
try{
httpclient.close();
}catch(IOExceptione){
e.printStackTrace();
}
}
returnnull;
}
2、用于发送key-value格式的参数
/**
*post请求(用于key-value格式的参数)
*
*@paramurl
*@paramparams
*@return
*/
publicstaticStringdoPost(Stringurl,Mapparams){
BufferedReaderin=null;
try{
//定义HttpClient
HttpClientclient=newDefaultHttpClient();
//实例化HTTP方法
HttpPostrequest=newHttpPost();
request.setURI(newURI(url));
//设置参数
Listnvps=newArrayList();
for(Iteratoriter=params.keySet().iterator();iter.hasNext();){
Stringname=(String)iter.next();
Stringvalue=String.valueOf(params.get(name));
nvps.add(newBasicNameValuePair(name,value));
//System.out.println(name+"-"+value);
}
request.setEntity(newUrlEncodedFormEntity(nvps,HTTP.UTF_8));
HttpResponseresponse=client.execute(request);
intcode=response.getStatusLine().getStatusCode();
if(code==200){//请求成功
in=newBufferedReader(newInputStreamReader(response.getEntity()
.getContent(),"utf-8"));
StringBuffersb=newStringBuffer("");
Stringline="";
StringNL=System.getProperty("line.separator");
while((line=in.readLine())!=null){
sb.append(line+NL);
}
in.close();
returnsb.toString();
}else{//
System.out.println("状态码："+code);
returnnull;
}
}catch(Exceptione){
e.printStackTrace();
returnnull;
}
}
第三，发送get请求
/**
*get请求
*
*@return
*/
publicstaticStringdoGet(Stringurl){
try{
HttpClientclient=newDefaultHttpClient();
//发送get请求
HttpGetrequest=newHttpGet(url);
HttpResponseresponse=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**/
StringstrResult=EntityUtils.toString(response.getEntity());
returnstrResult;
}
}catch(IOExceptione){
e.printStackTrace();
}
returnnull;
}
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毛票票网站的支持！