android中用GET和POST的方法向服务器上传数据

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两者的区别如下：

GET上传的数据一般是很小的并且安全性能不高的数据，而POST上传的数据适用于数据量大，数据类型复杂，数据安全性能要求高的地方

GET和POST的使用方法一般如下：

1.采用GET方式向服务器传递数据的步骤

1.利用Map集合对数据进行获取并进行数据处理
if (params!=null&&!params.isEmpty()) {
for (Map.Entry<String, String> entry:params.entrySet()) {

sb.append(entry.getKey()).append("=");
sb.append(URLEncoder.encode(entry.getValue(),encoding));
sb.append("&");
   }
sb.deleteCharAt(sb.length()-1);

}

2.新建一个StringBuilder对象
sb=new StringBuilder()
3.新建一个HttpURLConnection的URL对象，打开连接并传递服务器的path
connection=(HttpURLConnection) new URL(path).openConnection();
4.设置超时和连接的方式

connection.setConnectTimeout(5000);
connection.setRequestMethod("GET");

2.采用POST方式向服务器传递数据的步骤

1.利用Map集合对数据进行获取并进行数据处理
if (params!=null&&!params.isEmpty()) {
for (Map.Entry<String, String> entry:params.entrySet()) {

sb.append(entry.getKey()).append("=");
sb.append(URLEncoder.encode(entry.getValue(),encoding));
sb.append("&");
   }
sb.deleteCharAt(sb.length()-1);

}

2.新建一个StringBuilder对象，得到POST传给服务器的数据
sb=new StringBuilder()
byte[] data=sb.toString().getBytes();
3.新建一个HttpURLConnection的URL对象，打开连接并传递服务器的path
connection=(HttpURLConnection) new URL(path).openConnection();
4.设置超时和允许对外连接数据
connection.setDoOutput(true);
5.设置连接的setRequestProperty属性

connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
connection.setRequestProperty("Content-Length",data.length+"");
6.得到连接输出流
outputStream =connection.getOutputStream();
7.把得到的数据写入输出流中并刷新
outputStream.write(data);
outputStream.flush();

3.具体实现的过程如下：
1.使用GET方法上传数据
服务器中doGet方法中的代码如下：

[java] view plaincopyprint?protectedvoid doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {

        String name=request.getParameter("name");
        Stringage=request.getParameter("age");
       System.out.println("--------name:"+name);
       System.out.println("--------age:"+age);

    }

protected void doGet(HttpServletRequestrequest, HttpServletResponse response) throws ServletException, IOException {

  String name =request.getParameter("name");
  String age=request.getParameter("age");
  System.out.println("--------name:"+name);
  System.out.println("--------age:"+age);

}
在客户端实现的代码如下：

[java] view plaincopyprint?public class UserSerivce {

    public static boolean save(String getname, String getage)throws Exception {

        String path ="http://10.254.1.62/WebForGETMethod/ServletForGetMethod";

        Map<String, String> params =new HashMap<String, String>();
        params.put("name",getname);
        params.put("age",getage);

        return sendGETRequest(path, params,"UTF-8");
    }

    private static boolean sendGETRequest(String path,
           Map<String, String> params, String encoding) throws Exception {

        StringBuilder sb = newStringBuilder(path);
        if (params != null &&!params.isEmpty()) {
           sb.append("?");
            for(Map.Entry<String, String> entry : params.entrySet()) {

               sb.append(entry.getKey()).append("=");
               sb.append(URLEncoder.encode(entry.getValue(), encoding));
               sb.append("&");
            }
           sb.deleteCharAt(sb.length() - 1);
        }

        HttpURLConnection connection =(HttpURLConnection) new URL(
               sb.toString()).openConnection();
       connection.setConnectTimeout(5000);
       connection.setRequestMethod("GET");
        if (connection.getResponseCode() ==200) {
            returntrue;
        }

        return false;
    }

}

public class UserSerivce {

public static boolean save(Stringgetname, String getage) throws Exception {

String path ="http://10.254.1.62/WebForGETMethod/ServletForGetMethod";

  Map<String, String>params = new HashMap<String, String>();
  params.put("name", getname);
  params.put("age", getage);

return sendGETRequest(path,params, "UTF-8");
}

private static booleansendGETRequest(String path,
Map<String, String> params, String encoding) throwsException {

  StringBuilder sb = newStringBuilder(path);
  if (params != null && !params.isEmpty()) {
   sb.append("?");
   for (Map.Entry<String, String> entry :params.entrySet()) {

    sb.append(entry.getKey()).append("=");
    sb.append(URLEncoder.encode(entry.getValue(),encoding));
    sb.append("&");
   }
   sb.deleteCharAt(sb.length() - 1);
  }

  HttpURLConnection connection= (HttpURLConnection) new URL(
    sb.toString()).openConnection();
  connection.setConnectTimeout(5000);
  connection.setRequestMethod("GET");
  if (connection.getResponseCode() == 200) {
   return true;
  }

return false;
}

}
然后呢，就是实现在android客户端的界面

[java] view plaincopyprint?public classGetDataToWebActivity extends Activity {
private EditText name,age;
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.getdate);
        name=(EditText)findViewById(R.id.name);
        age=(EditText)findViewById(R.id.age);
    }
    public void save(View v) {
        Stringgetname=name.getText().toString();
        Stringgetage=age.getText().toString();

        boolean result=false;
        try {
            result=UserSerivce.save(getname,getage);
        } catch (Exception e) {
            // TODOAuto-generated catch block
           e.printStackTrace();
        }

        if (result) {
           Toast.makeText(this, "成功", 1).show();

        }else {
           Toast.makeText(this, "失败", 1).show();
        }
    }
}

public class GetDataToWebActivityextends Activity {
private EditText name,age;
public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.getdate);
        name=(EditText)findViewById(R.id.name);
        age=(EditText)findViewById(R.id.age);
    }
public void save(View v) {
  String getname=name.getText().toString();
  String getage=age.getText().toString();

  boolean result=false;
  try {
   result=UserSerivce.save(getname,getage);
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  if (result) {
   Toast.makeText(this, "成功", 1).show();

  }else {
   Toast.makeText(this, "失败",1).show();
  }
}
}

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