Android 提交数据之HttpClient

public class MainActivity extends Activity {

    private EditText et_username;
    private EditText et_password;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // [1]找到我们关心的控件
        
        et_username = (EditText) findViewById(R.id.et_username);
        et_password = (EditText) findViewById(R.id.et_password);

    }

    // 点击按钮 进行get方式提交数据
    public void click1(View v) {
        
        new Thread(){public void run() {
            try {
                String name = et_username.getText().toString().trim();
                String pwd = et_password.getText().toString().trim();
                //[2.1]定义get方式要提交的路径    小细节 如果提交中文要对name 和 pwd 进行一个urlencode 编码 
                    String path = "http://192.168.11.73:8080/login/LoginServlet?username="+URLEncoder.encode(name, "utf-8")+"&password="+URLEncoder.encode(pwd, "utf-8")+"";
                    
                    //[3]获取httpclient实例 
                    DefaultHttpClient client = new DefaultHttpClient();
                    //[3.1]准备get请求 定义 一个httpget实现 
                    HttpGet get = new HttpGet(path);
                    
                    //[3.2]执行一个get请求  
                    HttpResponse response = client.execute(get);
                    
                    //[4]获取服务器返回的状态码
                    int code = response.getStatusLine().getStatusCode();
                    if (code == 200) {
                        //[5]获取服务器返回的数据   以流的形式返回 
                        InputStream inputStream = response.getEntity().getContent();
                        
                        //[6]把流转换成字符串
                        String content = StreamTools.readStream(inputStream);   
                    
                        //[7]展示结果
                        showToast(content);
                    }
                    
                    
                    
                    
                    
                } catch (Exception e) {
                    e.printStackTrace();
                }
            
        };}.start();
        
        
        
    }

    // [1]点击按钮 进行post方式提交数据
    public void click2(View v) {

        
    new Thread(){public void run() {
            
            try {
                //[2]获取用户名和密码 
                String name = et_username.getText().toString().trim();
                String pwd = et_password.getText().toString().trim();
                String path = "http://192.168.11.73:8080/login/LoginServlet";
                
                //[3]以httpClient 方式进行post 提交 
                DefaultHttpClient client = new DefaultHttpClient();
                //[3.1]准备post 请求 
                HttpPost post = new HttpPost(path);

                //[3.1.0]准备parameters 
                List lists = new ArrayList();
                //[3.1.1]准备 NameValuePair 实际上就是我们要提交的用户名 和密码  key是服务器key :username
                BasicNameValuePair nameValuePair = new BasicNameValuePair("username",name);
                BasicNameValuePair pwdValuePair = new BasicNameValuePair("password",pwd);
                //[3.1.3] 把nameValuePair  和 pwdValuePair  加入到集合中
                lists.add(nameValuePair);
                lists.add(pwdValuePair);
                
                //[3.1.3]准备entity
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(lists);
                
                //[3.2]准备post方式提交的正文   以实体形式准备 (键值对形式 )
                post.setEntity(entity);
                
                
                HttpResponse response = client.execute(post);
                //[4]获取服务器返回的状态码
                int code = response.getStatusLine().getStatusCode();
                if (code == 200) {
                    //[5]获取服务器返回的数据   以流的形式返回 
                    InputStream inputStream = response.getEntity().getContent();
                    
                    //[6]把流转换成字符串
                    String content = StreamTools.readStream(inputStream);   
                    
                    //[7]展示结果
                    showToast(content);
                }
                
            } catch (Exception e) {
                e.printStackTrace();
            }
            
            
            
            
            
        };}.start();
        
        
    }
    
    
    
    //封装toast方法  该toast方法执行在主线程 
    public void showToast(final String content){
        runOnUiThread(new Runnable() {
            
            @Override
            public void run() {
                //该方法一定是执行主线程 
                Toast.makeText(getApplicationContext(), content, 1).show();
                
                
            }
        });
        
    }

}

把一个inputstream转化成一个string

public class StreamTools {

    //把一个inputStream 转换成一个String 
    public static String readStream(InputStream in) throws Exception{
        
        //定义一个内存输出流
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int len = -1;
        byte[] buffer = new byte[1024]; //1kb
        while((len=in.read(buffer))!=-1){
            
            baos.write(buffer, 0, len);
        }
        in.close();
        String content = new String(baos.toByteArray(),"gbk");
        
        return content;
        
    }
    
}