Java读取网络数据（新浪网址）InputStream的数据流操作实录笔记（一） 分享出来供大家参考！

package sina.jsontest.test;import java.io.IOException;import java.io.InputStream;import java.util.Iterator;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.codehaus.jackson.JsonNode;import org.codehaus.jackson.JsonParseException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;public class NetWorkOperator {/** * @reference  * 1.<a href="http://www.cnblogs.com/MyFavorite/archive/2010/10/19/1855758.html">http://www.cnblogs.com/MyFavorite/archive/2010/10/19/1855758.html</a><br> * 2.<a href="http://www.blogjava.net/pengpenglin/archive/2008/12/16/220350.html">http://www.blogjava.net/pengpenglin/archive/2008/12/16/220350.html</a><br> * @param args * @throws Exception */public static void main(String[] args)throws Exception {NetWorkOperator kx=new NetWorkOperator();String json=kx.getReponse(SinaJsonTest.SinaUrl);kx.JSONNodeParse(json);}/** * <b>获取指定的URL返回的数据信息</b> * @param <font color="#efac10"><a href="http://www.baidu.com">_url:指定的URL</a></font> * @return * @throws ClientProtocolException * @throws IOException */public String getReponse(String _url) throws ClientProtocolException, IOException{String readContent=null;DefaultHttpClient httpclient = new DefaultHttpClient();        HttpGet httpget = new HttpGet(SinaJsonTest.SinaUrl);        System.out.println("0.Send the URL to Sina Sever....");        HttpResponse response = httpclient.execute(httpget);        HttpEntity entity = response.getEntity();        System.out.println("1.Get Response Status: " + response.getStatusLine());        if (entity != null) {            System.out.println("  Get ResponseContentEncoding():"+entity.getContentEncoding());            System.out.println("  Content Length():"+entity.getContentLength());            //getResponse            InputStream in=entity.getContent();            int count = 0;            while (count == 0) {             count = Integer.parseInt(""+entity.getContentLength());//in.available();            }            byte[] bytes = new byte[count];            int readCount = 0; // 已经成功读取的字节的个数            while (readCount <= count) {             if(readCount == count)break;             readCount += in.read(bytes, readCount, count - readCount);            }                        //转换成字符串            readContent= new String(bytes, 0, readCount, "UTF-8"); // convert to string using bytes            System.out.println("2.Get Response Content():\n"+readContent);        }return readContent;}/** * @core 重点用到了readTree方法:  * 1.从文件读取  * ObjectMapper mapper = new ObjectMapper(); *       JsonFactory f = new JsonFactory(); *       JsonParser jp = f.createJsonParser(new File(fileName));  *       JsonNode root = mapper.readTree(jp); * 2.从字符串读取 *  ObjectMapper mapper = new ObjectMapper();  *  JsonNode userRootNode = mapper.readTree(json); *  <br/><font color='red'>Java JSON</font> * @param <cite>fileName</cite>=<b>FilePath+FileName</b> */public void JSONNodeParse(String json) {try {ObjectMapper mapper = new ObjectMapper();JsonNode root = mapper.readTree(json);System.out.println("Source:\n"+root.toString());JsonNode userInfoNode = root.path("users").get(0);System.out.println("userInfo:" + userInfoNode.toString());// 还可以继续解析int next_cursor = root.path("next_cursor").getIntValue();System.out.println("next_cursor:" + next_cursor);JsonNode previous_cursorNode = root.path("previous_cursor");System.out.println("previous_cursorNode:"+ previous_cursorNode.getIntValue());for (JsonNode node : root.path("users")) {System.out.println("Full Entry: " + node.toString());// 解析userInfoNodeString sub_json = node.toString();try {JsonNode userRootNode = mapper.readTree(sub_json);System.out.println("UserRoot Node Size:"+ userRootNode.size());Iterator<String> itr = null;for (JsonNode _node : userRootNode) {itr=_node.getFieldNames();//System.out.println("Entry(followers_count): "//+ _node.path("followers_count").getValueAsText());while (itr.hasNext()) {String fieldName = itr.next();if(fieldName.equals("province"))System.out.println("province exists!");if (_node.path(fieldName).toString().startsWith("\"")&& _node.path(fieldName).toString().endsWith("\""))System.out.println("Entry("+ fieldName+ "): "+ _node.path(fieldName).toString().substring(1,_node.path(fieldName).toString().length() - 1));elseSystem.out.println("Entry(" + fieldName + "): "+ _node.path(fieldName).toString());}}} catch (JsonParseException e) {e.printStackTrace();} catch (JsonMappingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}} catch (JsonParseException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

用到的 *.jar 包如下：

Eclipse测试通过！分享出来供大家参考。