Android发送GET与POST请求的DEMO详解

4.0后网络访问必须单独起一个子线程访问，否则无法运行，这里有一个发送请求的工具类getpostutil

public class getpostutil
{
 /**
  * 向指定url发送get方法的请求
  *
  * @param url
  *            发送请求的url
  * @param params
  *            请求参数，请求参数应该是name1=value1&name2=value2的形式。
  * @return url所代表远程资源的响应
  */
 public static string sendget(string url, string params)
 {
  string result = "";
  bufferedreader in = null;
  try
  {
   string urlname = url + "?" + params;
   url realurl = new url(urlname);
   // 打开和url之间的连接
   urlconnection conn = realurl.openconnection();
   // 设置通用的请求属性
   conn.setrequestproperty("accept", "*/*");
   conn.setrequestproperty("connection", "keep-alive");
   conn.setrequestproperty("user-agent",
    "mozilla/4.0 (compatible; msie 6.0; windows nt 5.1; sv1)");
   // 建立实际的连接
   conn.connect();
   // 获取所有响应头字段
   map<string, list<string>> map = conn.getheaderfields();
   // 遍历所有的响应头字段
   for (string key : map.keyset())
   {
    system.out.println(key + "--->" + map.get(key));
   }
   // 定义bufferedreader输入流来读取url的响应
   in = new bufferedreader(
    new inputstreamreader(conn.getinputstream()));
   string line;
   while ((line = in.readline()) != null)
   {
    result += "\n" + line;
   }
  }
  catch (exception e)
  {
   system.out.println("发送get请求出现异常！" + e);
   e.printstacktrace();
  }
  // 使用finally块来关闭输入流
  finally
  {
   try
   {
    if (in != null)
    {
     in.close();
    }
   }
   catch (ioexception ex)
   {
    ex.printstacktrace();
   }
  }
  return result;
 }
 /**
  * 向指定url发送post方法的请求
  *
  * @param url
  *            发送请求的url
  * @param params
  *            请求参数，请求参数应该是name1=value1&name2=value2的形式。
  * @return url所代表远程资源的响应
  */
 public static string sendpost(string url, string params)
 {
  printwriter out = null;
  bufferedreader in = null;
  string result = "";
  try
  {
   url realurl = new url(url);
   // 打开和url之间的连接
   urlconnection conn = realurl.openconnection();
   // 设置通用的请求属性
   conn.setrequestproperty("accept", "*/*");
   conn.setrequestproperty("connection", "keep-alive");
   conn.setrequestproperty("user-agent",
    "mozilla/4.0 (compatible; msie 6.0; windows nt 5.1; sv1)");
   // 发送post请求必须设置如下两行
   conn.setdooutput(true);
   conn.setdoinput(true);
   // 获取urlconnection对象对应的输出流
   out = new printwriter(conn.getoutputstream());
   // 发送请求参数
   out.print(params);
   // flush输出流的缓冲
   out.flush();
   // 定义bufferedreader输入流来读取url的响应
   in = new bufferedreader(
    new inputstreamreader(conn.getinputstream()));
   string line;
   while ((line = in.readline()) != null)
   {
    result += "\n" + line;
   }
  }
  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 (in != null)
    {
     in.close();
    }
   }
   catch (ioexception ex)
   {
    ex.printstacktrace();
   }
  }
  return result;
 }
}

activity类代码

public class getpostmain extends activity
{
 button get , post;
 edittext show;
 @override
 public void oncreate(bundle savedinstancestate)
 {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.main);
  get = (button) findviewbyid(r.id.get);
  post = (button) findviewbyid(r.id.post);
  show = (edittext)findviewbyid(r.id.show);
  //利用handler更新ui
  final handler h = new handler(){
   @override
   public void handlemessage(message msg) {
    if(msg.what==0x123){
     show.settext(msg.obj.tostring());
    }
   }
  };

  get.setonclicklistener(new onclicklistener()
  {
   @override
   public void onclick(view v)
   {
    new thread(new accessnetwork("get", "http://192.168.1.88:8080/abc/a.jsp", null, h)).start();
   }   
  });
  post.setonclicklistener(new onclicklistener()
  {
   @override
   public void onclick(view v)
   {
    new thread(new accessnetwork("post", "http://192.168.1.88:8080/abc/login.jsp", "name=crazyit.org&pass=leegang", h)).start();
   }   
  }); 
 }
}
class accessnetwork implements runnable{
 private string op ;
 private string url;
 private string params;
 private handler h;

 public accessnetwork(string op, string url, string params,handler h) {
  super();
  this.op = op;
  this.url = url;
  this.params = params;
  this.h = h;
 }
 @override
 public void run() {
  message m = new message();
  m.what = 0x123;
  if(op.equals("get")){
   log.i("iiiiiii","发送get请求");
   m.obj = getpostutil.sendget(url, params);
   log.i("iiiiiii",">>>>>>>>>>>>"+m.obj);
  }
  if(op.equals("post")){
   log.i("iiiiiii","发送post请求");
   m.obj = getpostutil.sendpost(url, params);
   log.i("gggggggg",">>>>>>>>>>>>"+m.obj);
  }
  h.sendmessage(m);
 }
}