HttpClient获取并解析JSON数据

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JsonObjectresultJsonObject=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JsonObjectresultJsonObject = new JSONObject(entityStringBuilder.toString());} catch (Exception e) {e.printStackTrace();}}}} catch (Exception e) {e.printStackTrace();}return resultJsonObject;}}