向服务器提交数据（GET-POST-AsyncHttpClient）

2019-11-06 09:07:07

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来源：转载

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android客户端+java服务器端

服务器端代码

@WebServlet("/PRintServlet") public class PrintServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8"); String age = new String(request.getParameter("age").getBytes("ISO-8859-1"),"UTF-8"); System.out.println("姓名:"+name+"/n年龄："+age); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("UTF-8"); System.out.println("姓名:"+request.getParameter("name")+"/n年龄："+request.getParameter("age")); } }

Android权限：

<uses-permission android:name="android.permission.INTERNET"/> private OnClickListener listener = new OnClickListener() { @Override public void onClick(View v) { try{ if (getbutton == v) { /* * 因为是GET请求，所以需要将请求参数添加到URL后，并且还需要进行URL编码 * URL = http://192.168.0.103:8080/Server/PrintServlet?name=%E6%88%91&age=20 * 此处需要进行URL编码因为浏览器提交时自动进行URL编码 * */ StringBuilder buf = new StringBuilder("http://192.168.0.103:8080/Server/PrintServlet"); buf.append("?"); buf.append("name="+URLEncoder.encode(name.getText().toString(),"UTF-8")+"&"); buf.append("age="+URLEncoder.encode(age.getText().toString(),"UTF-8")); URL url = new URL(buf.toString()); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.setRequestMethod("GET"); if(conn.getResponseCode()==200){ Toast.makeText(MainActivity.this, "GET提交成功", Toast.LENGTH_SHORT).show(); } else Toast.makeText(MainActivity.this, "GET提交失败", Toast.LENGTH_SHORT).show(); } if (postbutton == v) { /* * 如果是POST请求，则请求参数放在请求体中， * name=%E6%88%91&age=12 * * */ StringBuilder buf = new StringBuilder(); buf.append("name="+URLEncoder.encode(name.getText().toString(),"UTF-8")+"&"); buf.append("age="+URLEncoder.encode(age.getText().toString(),"UTF-8")); byte[]data = buf.toString().getBytes("UTF-8"); URL url = new URL("http://192.168.0.103:8080/Server/PrintServlet"); HttpURLConnection conn = (HttpURLConnection)url.openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); //如果要输出，则必须加上此句 OutputStream out = conn.getOutputStream(); out.write(data); if(conn.getResponseCode()==200){ Toast.makeText(MainActivity.this, "GET提交成功", Toast.LENGTH_SHORT).show(); } else Toast.makeText(MainActivity.this, "GET提交失败", Toast.LENGTH_SHORT).show(); } } catch(Exception e){ } } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); name = (EditText) this.findViewById(R.id.name); age = (EditText) this.findViewById(R.id.age); getbutton = (Button) this.findViewById(R.id.getbutton); postbutton = (Button) this.findViewById(R.id.postbutton); getbutton.setOnClickListener(listener); postbutton.setOnClickListener(listener); } }

三种提交方式的区别：

GET提交数据：

public void loginByGet(View view) { String uname = et_main_uname.getText().toString(); String upass = et_main_upass.getText().toString(); String path = getString(R.string.server_name) + "login.xhtml"; //可变数组 new MyTask().execute(uname, upass, path, "GET"); }

POST提交：

public void loginByPost(View view) { String uname = et_main_uname.getText().toString(); String upass = et_main_upass.getText().toString(); String path = getString(R.string.server_name) + "login.xhtml"; //可变数组 new MyTask().execute(uname, upass, path, "POST"); }

AsyncHttpClient属于android的开源框架：使用前导入相对于的包

public void loginByAsyncHttpClient(View view) { String uname = et_main_uname.getText().toString(); String upass = et_main_upass.getText().toString(); String path = getString(R.string.server_name) + "login.xhtml"; AsyncHttpClient asyncHttpClient=new AsyncHttpClient(); RequestParams requestParams=new RequestParams(); requestParams.put("uname",uname); requestParams.put("upass",upass); asyncHttpClient.post(path,requestParams,new TextHttpResponseHandler(){ @Override public void onSuccess(int statusCode, Header[] headers, String responseBody) { super.onSuccess(statusCode, headers, responseBody); Toast.makeText(MainActivity.this, responseBody, Toast.LENGTH_SHORT).show(); } @Override public void onFailure(int statusCode, Header[] headers, String responseBody, Throwable error) { super.onFailure(statusCode, headers, responseBody, error); } }); }

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