Jie的懶教學，這次來教大家來寫一隻Android的懶人HttpClient程式：
在Android使用Http通訊協定(GET,POST)讀取網頁或做資料存取的時候，
每次都要做一堆try catch處理。
POST的時後設定的NameValuePair形態使用也不太習慣，
基本上POST的形態都是字串，所以接口乾脆直接改成用HashMap<String,String>來設定感覺比較親切些。
當然最重要的原因還是懶，懶人就是要想盡辦法一行就搞定：Ｄ
懶人前：
package com.example.jiehttpclient;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
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.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class JieHttpClient {
public static String GET(String url){
String result = "";
HttpGet get = new HttpGet(url);
try {
HttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(get);
if(httpResponse.getStatusLine().getStatusCode()== HttpStatus.SC_OK){
result = EntityUtils.toString(httpResponse.getEntity());
}else{
result = "JieHttpClient GET Fail";
}
}catch(ClientProtocolException e){
System.out.println("JieHttpClient GET Error = "+e.getMessage().toString());
}catch (IOException e){
System.out.println("JieHttpClient GET Error = "+e.getMessage().toString());
}catch (Exception e){
System.out.println("JieHttpClient GET Error = "+e.getMessage().toString());
}
return result;
}
public static String POST(String url,HashMap<String,String> paramsMap){
String result = "";
HttpPost post = new HttpPost(url);
try {
if(paramsMap!=null){
List<NameValuePair> params = new ArrayList<NameValuePair>();
for(Map.Entry<String,String> entry:paramsMap.entrySet()){
params.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));
}
HttpEntity httpEntity = new UrlEncodedFormEntity(params,"utf-8");
post.setEntity(httpEntity);
}
HttpClient httpClient = new DefaultHttpClient();
HttpResponse httpResponse = httpClient.execute(post);
if(httpResponse.getStatusLine().getStatusCode()== HttpStatus.SC_OK){
result = EntityUtils.toString(httpResponse.getEntity());
}else{
result = "JieHttpClient POST Fail";
}
}catch(ClientProtocolException e){
System.out.println("JieHttpClient POST Error = " + e.getMessage().toString());
}catch (IOException e){
System.out.println("JieHttpClient POST Error = " + e.getMessage().toString());
}catch (Exception e){
System.out.println("JieHttpClient POST Error = " + e.getMessage().toString());
}
return result;
}
}
懶人後：
//GET
String result = JieHttpClient.GET("GET URL");
//POST
HashMap<String,String> params = new HashMap<String, String>();
params.put("key1","value1");
params.put("key2","value2");
String result = JieHttpClient.POST("POST URL",params);
回傳的result字串可能是HTML，XML或JSON，就視狀況去處理啦~
完工，爆肝。
