HttpClient获取并解析JSON数据
jopen
11年前
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; } }