用HttpClient模拟HTTP的GET和POST请求(转)
本文转自:http://blog.csdn.net/xiazdong/article/details/7724349
一、HttpClient介绍
二、服务器端代码
- package org.xiazdong.servlet;
- import java.io.IOException;
- import java.io.OutputStream;
- import javax.servlet.ServletException;
- import javax.servlet.annotation.WebServlet;
- import javax.servlet.http.HttpServlet;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- @WebServlet("/Servlet1")
- public class Servlet1 extends HttpServlet {
- protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- String nameParameter = request.getParameter("name");
- String ageParameter = request.getParameter("age");
- String name = new String(nameParameter.getBytes("ISO-8859-1"),"UTF-8");
- String age = new String(ageParameter.getBytes("ISO-8859-1"),"UTF-8");
- System.out.println("GET");
- System.out.println("name="+name);
- System.out.println("age="+age);
- response.setCharacterEncoding("UTF-8");
- OutputStream out = response.getOutputStream();//返回数据
- out.write("GET请求成功!".getBytes("UTF-8"));
- out.close();
- }
- protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
- request.setCharacterEncoding("UTF-8");
- String name = request.getParameter("name");
- String age = request.getParameter("age");
- System.out.println("POST");
- System.out.println("name="+name);
- System.out.println("age="+age);
- response.setCharacterEncoding("UTF-8");
- OutputStream out = response.getOutputStream();
- out.write("POST请求成功!".getBytes("UTF-8"));
- out.close();
- }
- }
三、Android客户端代码
在AndroidManifest.xml加入:
- <uses-permission android:name="android.permission.INTERNET"/>
- package org.xiazdong.network.httpclient;
- import java.io.ByteArrayOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.URLEncoder;
- import java.util.ArrayList;
- import java.util.List;
- import org.apache.http.HttpResponse;
- import org.apache.http.NameValuePair;
- 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.impl.client.DefaultHttpClient;
- import org.apache.http.message.BasicNameValuePair;
- import android.app.Activity;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.Toast;
- public class MainActivity extends Activity {
- private EditText name, age;
- private Button getbutton, postbutton;
- private OnClickListener listener = new OnClickListener() {
- @Override
- public void onClick(View v) {
- try{
- if(postbutton==v){
- /*
- * NameValuePair代表一个HEADER,List<NameValuePair>存储全部的头字段
- * UrlEncodedFormEntity类似于URLEncoder语句进行URL编码
- * HttpPost类似于HTTP的POST请求
- * client.execute()类似于发出请求,并返回Response
- */
- DefaultHttpClient client = new DefaultHttpClient(); //这里的DefaultHttpClient现在已经过时了,现在用的是HttpClient
- List<NameValuePair> list = new ArrayList<NameValuePair>();
- NameValuePair pair1 = new BasicNameValuePair("name", name.getText().toString());
- NameValuePair pair2 = new BasicNameValuePair("age", age.getText().toString());
- list.add(pair1);
- list.add(pair2);
- UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,"UTF-8");
- HttpPost post = new HttpPost("http://192.168.0.103:8080/Server/Servlet1");
- post.setEntity(entity);
- HttpResponse response = client.execute(post);
- if(response.getStatusLine().getStatusCode()==200){
- InputStream in = response.getEntity().getContent();//接收服务器的数据,并在Toast上显示
- String str = readString(in);
- Toast.makeText(MainActivity.this, str, Toast.LENGTH_SHORT).show();
- }
- else Toast.makeText(MainActivity.this, "POST提交失败", Toast.LENGTH_SHORT).show();
- }
- if(getbutton==v){
- DefaultHttpClient client = new DefaultHttpClient();
- StringBuilder buf = new StringBuilder("http://192.168.0.103:8080/Server/Servlet1");
- buf.append("?");
- buf.append("name="+URLEncoder.encode(name.getText().toString(),"UTF-8")+"&");
- buf.append("age="+URLEncoder.encode(age.getText().toString(),"UTF-8"));
- HttpGet get = new HttpGet(buf.toString());
- HttpResponse response = client.execute(get);
- if(response.getStatusLine().getStatusCode()==200){
- InputStream in = response.getEntity().getContent();
- String str = readString(in);
- Toast.makeText(MainActivity.this, str, 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);
- }
- protected String readString(InputStream in) throws Exception {
- byte[]data = new byte[1024];
- int length = 0;
- ByteArrayOutputStream bout = new ByteArrayOutputStream();
- while((length=in.read(data))!=-1){
- bout.write(data,0,length);
- }
- return new String(bout.toByteArray(),"UTF-8");
- }
- }
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