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:
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package main.utils;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpUtilTest {
Log log = new Log( this .getClass()); //初始化日志类
/**
* @作用 使用urlconnection
* @param url
* @param Params
* @return
* @throws IOException
*/
public String sendPost(String url,String Params) throws IOException{
OutputStreamWriter out = null ;
BufferedReader reader = null ;
String response= "" ;
try {
URL httpUrl = null ; //HTTP URL类 用这个类来创建连接
//创建URL
httpUrl = new URL(url);
//建立连接
HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
conn.setRequestMethod( "POST" );
conn.setRequestProperty( "Content-Type" , "application/json" );
conn.setRequestProperty( "connection" , "keep-alive" );
conn.setUseCaches( false ); //设置不要缓存
conn.setInstanceFollowRedirects( true );
conn.setDoOutput( true );
conn.setDoInput( true );
conn.connect();
//POST请求
out = new OutputStreamWriter(
conn.getOutputStream());
out.write(Params);
out.flush();
//读取响应
reader = new BufferedReader( new InputStreamReader(
conn.getInputStream()));
String lines;
while ((lines = reader.readLine()) != null ) {
lines = new String(lines.getBytes(), "utf-8" );
response+=lines;
}
reader.close();
// 断开连接
conn.disconnect();
log.info(response.toString());
} catch (Exception e) {
System.out.println( "发送 POST 请求出现异常!" +e);
e.printStackTrace();
}
//使用finally块来关闭输出流、输入流
finally {
try {
if (out!= null ){
out.close();
}
if (reader!= null ){
reader.close();
}
}
catch (IOException ex){
ex.printStackTrace();
}
}
return response;
}
}
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方法二:使用httpclient实现
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import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import main.utils.Log;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
//post请求方法
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;
}
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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://www.cnblogs.com/veitch-623/p/6259008.html