android通过POST和GET两种方式发送数据到web应用实战

一、web应用端

1、servlet

package com.caiz.web.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class AcceptServelet
*/
@WebServlet("/AcceptServelet")
public class AcceptServelet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String title = request.getParameter("title");
String id = request.getParameter("id");
System.out.println("method=" + request.getMethod());
System.out.println("id=" + id);
System.out.println("title=" + title);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}

}

 

2、filter，用于乱码处理

 

a、过滤器filter

package com.caiz.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

/**
* 参数编码处理过滤器
* @author HuangYucai
*/

@WebFilter("/*")
public class EncodingFilter implements Filter {

/**
* Default constructor.
*/
public EncodingFilter() {
}

/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}

/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {

HttpServletRequest req = (HttpServletRequest) request;
if ("GET".equals(req.getMethod())) {
EncodedHttpServletRequest warpper = new EncodedHttpServletRequest(
req);
chain.doFilter(warpper, response);
} else {
req.setCharacterEncoding("UTF-8");
chain.doFilter(request, response);
}

}

/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
}

}

b、包装request类

package com.caiz.web.filter;

import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

/**
* request的参数编码出来
* @author HuangYucai
*
*/
public class EncodedHttpServletRequest extends HttpServletRequestWrapper {

private HttpServletRequest request;

public EncodedHttpServletRequest(HttpServletRequest request) {
super(request);
this.request = request;
}

@Override
public String getParameter(String name) {
String value=request.getParameter(name);
if(value!=null){
try {
value=new String(value.getBytes("ISO8859-1"),"UTF-8");
} catch (UnsupportedEncodingException e) {
}
}
return value;
}

}

二、android应用端

 

 1、主程序类：Activity

package com.caiz.android.htmlviewer;

import com.caiz.android.htmlviewer.service.PageService;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

/**
 * 主程序类
 * @author HuangYucai
 */
public class HtmlViewerActivity extends Activity {
    /** Called when the activity is first created. */
    private EditText pathText;
    private Button viewBnt;
    private TextView txtViewer;
 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        pathText= (EditText)this.findViewById(R.id.path);
        viewBnt=(Button)this.findViewById(R.id.bnt);
        txtViewer=(TextView)this.findViewById(R.id.viewer);
        viewBnt.setOnClickListener(new BntOnclickListener());
    }
 
 public final class BntOnclickListener implements View.OnClickListener{

  public void onClick(View v) {
   String path=pathText.getText().toString();
   String html;
   try {//获取字符数据设置到TextView空间
    html = PageService.getPageStr(path);
    txtViewer.setText(html);
   } catch (Exception e) {
    e.printStackTrace();
    Toast.makeText(getApplicationContext(), "获取网页失败", Toast.LENGTH_SHORT).show();
   }
  }
  
 }
}

 

2、业务类service

 

package com.caiz.httpreq.service;

import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

/**
 * Android发送数据到web的业务类
 * @author HuangYucai
 *
 */
public class HttpSendService {

 // 通过GET方法提交数据
 public boolean saveByGetMethod(int id, String title) throws Exception {
  String path = "http://192.168.0.186:8080/web/AcceptServelet";
  // 构造参数的Map
  HashMap<String, String> params = new HashMap<String, String>();
  params.put("id", String.valueOf(id));
  params.put("title", title);
  // 发送GET请求
  return sendHttpClientRequest(path, params,"UTF-8");
 }

 // 通过HttpClient请求的方法
 public boolean sendHttpClientRequest(String path, Map<String, String> params,String charsetName)
   throws Exception {
  // 设置请求参数的名值对
  List<NameValuePair> pairList=new ArrayList<NameValuePair>();
  for (Map.Entry<String, String> entry : params.entrySet()) {
   pairList.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));
  }
  
  UrlEncodedFormEntity entity=new UrlEncodedFormEntity(pairList,charsetName);//创建请求的url实体
  HttpPost httpPost=new HttpPost(path);//创建http请求实例
  httpPost.setEntity(entity);
  
  DefaultHttpClient client=new DefaultHttpClient();// 实例化请求客户端
  HttpResponse response=client.execute(httpPost);// 执行请求
  if(response.getStatusLine().getStatusCode()==200){// 请求成功
   return true;
  }
  return false;
 }
 
 // 发送GET请求的方法
 public boolean sendGetRequest(String path, Map<String, String> params,String charsetName)
   throws Exception {
  // 拼接带参数的请求路径
  StringBuilder url = new StringBuilder(path);
  url.append("?");
  for (Map.Entry<String, String> entry : params.entrySet()) {
   url.append(entry.getKey()).append("=")
   .append(URLEncoder.encode(entry.getValue(),charsetName))
   .append("&");
  }
  url.deleteCharAt(url.length() - 1);
  
  // 发送请求
  HttpURLConnection conn = (HttpURLConnection) (new URL(url.toString())
  .openConnection());
  
  conn.setRequestMethod("GET");
  conn.setConnectTimeout(5000);
  if (conn.getResponseCode() == 200) {//如果发送成功
   return true;
  }
  return false;
 }
 
 
 // 发送Post请求的方法
 public boolean sendPostRequest(String path, Map<String, String> params,String charsetName)
   throws Exception {
  // 拼接带参数的请求路径
  StringBuilder data = new StringBuilder("");
  for (Map.Entry<String, String> entry : params.entrySet()) {
   data.append(entry.getKey()).append("=")
   .append(URLEncoder.encode(entry.getValue(),charsetName))
     .append("&");
  }
  data.deleteCharAt(data.length() - 1);
  
  byte[] dataBytes=data.toString().getBytes();
  
  
  // 发送请求
  HttpURLConnection conn = (HttpURLConnection) (new URL(path.toString()).openConnection());
  conn.setRequestMethod("POST");
  conn.setConnectTimeout(5000);
  conn.setDoOutput(true);//设置可以输出数据
  //设置内容类型
  conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
  //设置内容长度
  conn.setRequestProperty("Content-Length", String.valueOf(dataBytes.length));
  
  OutputStream outStream =conn.getOutputStream();
  outStream.write(dataBytes);
  
  if (conn.getResponseCode() == 200) {//如果发送成功
   return true;
  }
  return false;
 }

}

3、在主配置文件Androidmanifset.xml配置访问网络的权限

 

<uses-permission  android:name="android.permission.INTERNET"/>