HTTPclient+json

package com.example.testjsonandget;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

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.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.params.HttpClientParams;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.params.BasicHttpParams;

import org.apache.http.params.HttpConnectionParams;

import org.apache.http.params.HttpParams;

import org.json.JSONArray;

import org.json.JSONObject;

 

import android.app.Activity;

import android.os.Bundle;

 

public class MainActivity extends Activity {

    private final String uriString="your url";

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //服务器返回的JSON数据

        JSONObject jsonObject=this.getJSONObjectByGet();

        try {

            //从JSON中得到字符串

            String apiString=jsonObject.getString("api");

            String countString=jsonObject.getString("count");

            System.out.println("apiString="+apiString+",countString="+countString);

            //从JSON中得到JSONArray,并且遍历

            JSONArray jsonArray=jsonObject.getJSONArray("data");

            for (int i = 0; i < jsonArray.length(); i++) {

                JSONObject everyJsonObject=jsonArray.getJSONObject(i);

                String category_id=everyJsonObject.getString("category_id");

                String category_name=everyJsonObject.getString("category_name");

                String category_rgb=everyJsonObject.getString("category_rgb");

                String category_news_count=everyJsonObject.getString("category_news_count");

                System.out.println("category_id="+category_id+",category_name="+category_name+

                ",category_rgb="+category_rgb+",category_news_count="+category_news_count);

                System.out.println("=====================================================");

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

 

    //得到HttpClient

    public HttpClient getHttpClient(){

        HttpParams mHttpParams=new BasicHttpParams();

        //设置网络链接超时

        //即:Set the timeout in milliseconds until a connection is established.

        HttpConnectionParams.setConnectionTimeout(mHttpParams, 20*1000);

        //设置socket响应超时

        //即:in milliseconds which is the timeout for waiting for data.

        HttpConnectionParams.setSoTimeout(mHttpParams, 20*1000);

        //设置socket缓存大小

        HttpConnectionParams.setSocketBufferSize(mHttpParams, 8*1024);

        //设置是否可以重定向

        HttpClientParams.setRedirecting(mHttpParams, true);

         

        HttpClient httpClient=new DefaultHttpClient(mHttpParams);

        return httpClient;

    }

     

    //得到JSONObject(Get方式)

    public JSONObject getJSONObjectByGet(){

        JSONObject resultJsonObject=null;

        if ("".equals(uriString)||uriString==null) {

            return null;

        }

        HttpClient httpClient=this.getHttpClient();

        StringBuilder urlStringBuilder=new StringBuilder(uriString);

        StringBuilder entityStringBuilder=new StringBuilder();

        //利用URL生成一个HttpGet请求

        HttpGet httpGet=new HttpGet(urlStringBuilder.toString());

        BufferedReader bufferedReader=null;

        HttpResponse httpResponse=null;

        try {

            //HttpClient发出一个HttpGet请求

            httpResponse=httpClient.execute(httpGet);      

        } catch (Exception e) {

            e.printStackTrace();

        }

        //得到httpResponse的状态响应码

        int statusCode=httpResponse.getStatusLine().getStatusCode();

        if (statusCode==HttpStatus.SC_OK) {

            //得到httpResponse的实体数据

            HttpEntity httpEntity=httpResponse.getEntity();

            if (httpEntity!=null) {

                try {

                    bufferedReader=new BufferedReader

                    (new InputStreamReader(httpEntity.getContent(), "UTF-8"), 8*1024);

                    String line=null;

                    while ((line=bufferedReader.readLine())!=null) {

                        entityStringBuilder.append(line+"/n");

                    }

                    //利用从HttpEntity中得到的String生成JsonObject

                    resultJsonObject=new JSONObject(entityStringBuilder.toString());

                } catch (Exception e) {

                    e.printStackTrace();

                }

            }

        }

        return resultJsonObject;

    }

     

    //----------------------------------------以下为POST请求

    //准备进行POST请求的参数，一般而言将这些参数封装在HashMap中

    public JSONObject save(String title, String timelength) throws Exception{

        Map<String,String> paramsHashMap = new HashMap<String, String>();

        paramsHashMap.put("title", title);

        paramsHashMap.put("timelength", timelength);

        paramsHashMap.put("method", "save");

        String path = "your url";

        return getJSONObjectByPost(path, paramsHashMap, "UTF-8");

    }

    //得到JSONObject(Post方式)

    //此方法此处未调用测试

    public JSONObject getJSONObjectByPost(String path,Map<String, String> paramsHashMap, String encoding) {

        JSONObject resultJsonObject = null;

        List<NameValuePair> nameValuePairArrayList = new ArrayList<NameValuePair>();

        // 将传过来的参数填充到List<NameValuePair>中

        if (paramsHashMap != null && !paramsHashMap.isEmpty()) {

            for (Map.Entry<String, String> entry : paramsHashMap.entrySet()) {

                nameValuePairArrayList.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));

            }

        }

         

        UrlEncodedFormEntity entity = null;

        try {

            // 利用List<NameValuePair>生成Post请求的实体数据

            // 此处使用了UrlEncodedFormEntity!!!

            entity = new UrlEncodedFormEntity(nameValuePairArrayList, encoding);

            HttpPost httpPost = new HttpPost(path);

            // 为HttpPost设置实体数据

            httpPost.setEntity(entity);

            HttpClient httpClient = this.getHttpClient();

            // HttpClient发出Post请求

            HttpResponse httpResponse = httpClient.execute(httpPost);

            if (httpResponse.getStatusLine().getStatusCode() == 200) {

                // 得到httpResponse的实体数据

                HttpEntity httpEntity = httpResponse.getEntity();

                if (httpEntity != null) {

                    try {

                        BufferedReader bufferedReader = new BufferedReader(

                        new InputStreamReader(httpEntity.getContent(),"UTF-8"), 8 * 1024);

                        StringBuilder entityStringBuilder = new StringBuilder();

                        String line = null;

                        while ((line = bufferedReader.readLine()) != null) {

                            entityStringBuilder.append(line + "/n");

                        }

                        // 利用从HttpEntity中得到的String生成JsonObject

                        resultJsonObject = new JSONObject(entityStringBuilder.toString());

                    } catch (Exception e) {

                        e.printStackTrace();

                    }

                }

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

        return resultJsonObject;

    }

}