java发送get请求和post请求示例

java向服务端发送get和post请求

package com.hongyuan.test;

import java.io.bufferedreader;
import java.io.ioexception;
import java.io.inputstreamreader;
import java.io.printwriter;
import java.net.httpurlconnection;
import java.net.url;

public class httpclient {
 //发送一个get请求
 public static string get(string path) throws exception{
  httpurlconnection httpconn=null;
  bufferedreader in=null;
  try {
   url url=new url(path);
   httpconn=(httpurlconnection)url.openconnection();

   //读取响应
   if(httpconn.getresponsecode()==httpurlconnection.http_ok){
    stringbuffer content=new stringbuffer();
    string tempstr="";
    in=new bufferedreader(new inputstreamreader(httpconn.getinputstream()));
    while((tempstr=in.readline())!=null){
     content.append(tempstr);
    }
    return content.tostring();
   }else{
    throw new exception("请求出现了问题!");
   }
  } catch (ioexception e) {
   e.printstacktrace();
  }finally{
   in.close();
   httpconn.disconnect();
  }
  return null;
 }
 //发送一个get请求,参数形式key1=value1&key2=value2...
 public static string post(string path,string params) throws exception{
  httpurlconnection httpconn=null;
  bufferedreader in=null;
  printwriter out=null;
  try {
   url url=new url(path);
   httpconn=(httpurlconnection)url.openconnection();
   httpconn.setrequestmethod("post");
   httpconn.setdoinput(true);
   httpconn.setdooutput(true);

   //发送post请求参数
   out=new printwriter(httpconn.getoutputstream());
   out.println(params);
   out.flush();

   //读取响应
   if(httpconn.getresponsecode()==httpurlconnection.http_ok){
    stringbuffer content=new stringbuffer();
    string tempstr="";
    in=new bufferedreader(new inputstreamreader(httpconn.getinputstream()));
    while((tempstr=in.readline())!=null){
     content.append(tempstr);
    }
    return content.tostring();
   }else{
    throw new exception("请求出现了问题!");
   }
  } catch (ioexception e) {
   e.printstacktrace();
  }finally{
   in.close();
   out.close();
   httpconn.disconnect();
  }
  return null;
 }

 public static void main(string[] args) throws exception {
  //string resmessage=httpclient.get("http://localhost:3000/hello?hello=hello get");
  string resmessage=httpclient.post("http://localhost:3000/hello", "hello=hello post");
  system.out.println(resmessage);
 }

}