ANDROID_MARS学习笔记_S04_004_用HTTPCLENT发带参数的get和post请求

一、代码

1.xml
(1)activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.http2.MainActivity" >

    <EditText
        android:id="@+id/nameText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="小明" 
        />
    <EditText
        android:id="@+id/ageText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="123" 
        />
    <Button
        android:id="@+id/getBtnId"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Get请求" 
        android:onClick="getHttp"/>
    <Button
        android:id="@+id/postBtnId"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Post请求" 
        android:onClick="postHttp"/>

</LinearLayout>

(2)AndroidManifest.xml

增加

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

2.java
(1)HandleRequest.java  服务器端Servlet

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HandleRequest extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println("doGet");
        request.setAttribute("method", "get访求访问");
        request.setAttribute("name", request.getParameter("name"));
        request.setAttribute("age", request.getParameter("age"));
        response.getWriter().print("get访求访问--->"+request.getParameter("name")+"--->"+request.getParameter("age"));
        //request.getRequestDispatcher("index.jsp").forward(request, response);
    }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        System.out.println("doPost");
        request.setAttribute("method", "post访求访问");
        request.setAttribute("name", request.getParameter("name"));
        request.setAttribute("age", request.getParameter("age"));
        response.getWriter().print("post访求访问--->"+request.getParameter("name")+"--->"+request.getParameter("age"));
        //request.getRequestDispatcher("index.jsp").forward(request, response);
    }

}

(2)MainActivity.java 

package com.http2;

import java.util.ArrayList;
import java.util.List;

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

public class MainActivity extends Activity {

    //private Button getBtn,postBtn = null;
    private EditText nameView,ageView = null;
    private String baseUrl = "http://192.168.1.104:8080/AndroidServerTest/HandleRequest";
    private String name,age = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        nameView = (EditText) findViewById(R.id.nameText);
        ageView = (EditText) findViewById(R.id.ageText);
        name = nameView.getText().toString();
        age = ageView.getText().toString();
    }
    
    public void getHttp(View view) {
        String url = baseUrl + "?name=" + name + "&age=" + age;
        HttpAsyncTask httpAsyncTask = new HttpAsyncTask(url, "get");
        httpAsyncTask.execute("");
    }
    public void postHttp(View view) {
        //post的参数会放在httpEntity里，所以不用拼url
        List<String> parmas = new ArrayList<String>();
        parmas.add(name);
        parmas.add(age);
        HttpAsyncTask httpAsyncTask = new HttpAsyncTask(baseUrl, "post", parmas);
        httpAsyncTask.execute("");
    }
    
}

(3)HttpAsyncTask.java

package com.http2;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.os.AsyncTask;

public class HttpAsyncTask extends AsyncTask<String, Void, Void> {

    private String url;
    private String method;
    private List<String> params;
    
    public HttpAsyncTask(String url, String method) {
        super();
        this.url = url;
        this.method = method;
    }
    public HttpAsyncTask(String url, String method, List<String> params) {
        super();
        this.url = url;
        this.method = method;
        this.params = params;
    }

    @Override
    protected Void doInBackground(String... params) {
        if("get".equals(method))
            sendGetHttpRequest(url);
        else if("post".equals(method))
            sendPostRequest(url, this.params);
        return null;
    }
    
    private void sendPostRequest(String url,List<String> params) {
        System.out.println("sendPostRequest---->");
        NameValuePair nameValuePair1 = new BasicNameValuePair("name", this.params.get(0));
        NameValuePair nameValuePair2 = new BasicNameValuePair("age", this.params.get(1));
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
        nameValuePairs.add(nameValuePair1);
        nameValuePairs.add(nameValuePair2);
        InputStream inputStream = null;
        try {
            //请求体
            HttpEntity httpEntity = new UrlEncodedFormEntity(nameValuePairs);
            //url不用带参数-->"?a=1&b=2"
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(httpEntity);
            HttpClient httpClient = new DefaultHttpClient();
            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity respHttpEntity = httpResponse.getEntity();
            inputStream = respHttpEntity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String line = null;
            StringBuilder sb = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            System.out.println(sb);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
        
    private void sendGetHttpRequest(String url) {
        System.out.println("sendGetHttpRequest---->");
        //生成一个请求对象
        HttpGet httpGet = new HttpGet(url);
        //生成一个Http客户端对象
        HttpClient httpClient = new DefaultHttpClient();
        InputStream inputStream = null;
        //使用Http客户端发送请求对象
        try {
            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            inputStream = httpEntity.getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            String line = null;
            StringBuilder sb = new StringBuilder();
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            System.out.println(sb);
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                inputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}