Java-->Json解析網頁數據，java--json解析網頁

Java-->Json解析網頁數據，java--json解析網頁

--> 官方解析jar包： 鏈接：http://pan.baidu.com/s/1pKDnXKv 密碼：694d

--> 離線Json格式檢測工具： 鏈接：http://pan.baidu.com/s/1eSHkrOe 密碼：ju95

--> HttpUtil 工具類

 1 package com.dragon.java.jsonwebdata;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 import java.io.OutputStream;
 6 import java.net.HttpURLConnection;
 7 import java.net.URL;
 8 
 9 /**
10  * 得到服務器響應的數據流的工具類
11  * 
12  * @author Auser
13  * 
14  */
15 public class HttpUtil {
16 
17     public static InputStream getInputStreamByPost(String url, String parms) {
18         try {
19             HttpURLConnection conn = (HttpURLConnection) new URL(url)
20                     .openConnection();
21             conn.setReadTimeout(5000);
22             conn.setConnectTimeout(5000);
23             conn.setRequestMethod("POST");
24             conn.setDoOutput(true);
25 
26             OutputStream outputStream = conn.getOutputStream();
27             outputStream.write(parms.getBytes());
28             if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
29                 return conn.getInputStream();
30             }
31         } catch (IOException e) {
32             e.printStackTrace();
33         }
34         return null;
35     }
36 }

--> InputStreamUtil 工具類

 1 package com.dragon.java.jsonwebdata;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.IOException;
 5 import java.io.InputStream;
 6 import java.io.InputStreamReader;
 7 
 8 /**
 9  * 將服務器響應數據流轉換成String的工具類
10  * 
11  * @author Auser
12  * 
13  */
14 public class InputStreamUtil {
15 
16     public static String inputStreamToString(InputStream is) {
17         try (BufferedReader br = new BufferedReader(new InputStreamReader(is));) {
18             String line = null;
19             while ((line = br.readLine()) != null) {
20                 return line;
21             }
22         } catch (IOException e) {
23             e.printStackTrace();
24         }
25         return null;
26     }
27 }

--> JsonUtil 工具類

package com.dragon.java.jsonwebdata;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * Json解析的工具類
 * 
 * @author Auser
 * 
 */
public class JsonUtil {
    /**
     * 官方解析方法 --> 不管多復雜都可以解析，但是非常復雜！！！
     * 
     * @param json
     */
    public static void jsonParse(String json) {
        List<Detail> details = new ArrayList<>();
        try {
            JSONObject object = new JSONObject(json);
            if (object.getString("status").equals("000000")) {
                if (object.getString("desc").equals("null")) {
                    details = JSONArray(details, object);
                    for (Detail detail : details) {
                        System.out.println(detail);
                    }
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    /**
     * Json數組
     * 
     * @param details
     * @param object
     * @return List<Detail>
     * @throws JSONException
     */
    private static List<Detail> JSONArray(List<Detail> details,
            JSONObject object) throws JSONException {
        JSONArray array = object.getJSONArray("detail");
        for (int i = 0; i < array.length(); i++) {
            JSONObject object2 = array.getJSONObject(i);
            int id = object2.getInt("id");
            int xhid = object2.getInt("xhid");
            String author = object2.getString("author");
            String content = object2.getString("content");
            String picUrl = object2.getString("picUrl");
            String status = object2.getString("status");
            Detail detail = new Detail(id, xhid, author, content, picUrl,
                    status);
            details.add(detail);
        }
        return details;
    }
}

--> Test 測試類

package com.dragon.java.jsonwebdata;

import java.util.Scanner;

/*
 * Json解析網頁數據
 */
public class Test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("請輸入頁數:");
        int currentPage = scanner.nextInt();
        System.out.println("請輸入每頁笑話數:");
        int size = scanner.nextInt();

        String url = "http://api.1-blog.com/biz/bizserver/xiaohua/list.do";
        String parms = "currentPage=" + currentPage + "&size=" + size;
        // 得到服務器響應的數據並轉換成String
        String json = InputStreamUtil.inputStreamToString(HttpUtil
                .getInputStreamByPost(url, parms));
        // Json解析
        JsonUtil.jsonParse(json);
    }
}

--> 寫完發現用官方的解析方法，那是極復雜的...還是Gson方便！