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
复制代码 代码如下:
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
复制代码 代码如下:
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);
}
}
