java实现批量下载百度图片搜索到的图片

package com.guo.common;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;

public class IOUtils
{
    /*
     * 唯一实例
     */
    private static IOUtils instance;
    
    /**
     * 单例模式
     * @return IOUtils实例
     * @author  count 2015-7-8
     */
    public static IOUtils getIOUtilsInstance()
    {
        if (null != instance)
        {
            return instance;
        }
        synchronized (IOUtils.class)
        {
            if (null == instance)
            {
                instance = new IOUtils();
            }
            
            return instance;
        }
    }
    
    /**
     * 将inputStream转换成String
     * @param is inputStream
     * @return 转换后的Sring
     * 
     * @return String [返回类型说明]
     * @author  count 2015-7-8
     */
    public String conventInputStream2String(InputStream is)
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        
        //线程安全 Stringbuilder 线程非安全 StringBuffer
        StringBuilder sb = new StringBuilder();
        
        try
        {
            String line = "";
            while (null != (line = br.readLine()))
            {
                sb.append(line);
            }
        }
        catch (Exception e)
        {
            System.out.println(e);
        }
        finally
        {
            try
            {
                is.close();
                br.close();
            }
            catch (Exception e2)
            {
                System.out.println(e2);
            }
        }
        
        return sb.toString();
    }
    
    /**
     * 将inputStream写成文件保存在本地
     * @param is inputStream流
     * @param path 文件路径
     * @param fileName 文件名
     * 
     * @return void [返回类型说明]
     * @author  count 2015-7-8
     */
    public void conventInpputStream2File(InputStream is, String path, String fileName)
    {
        File file = new File(path);
        
        if (!file.exists() || !file.isDirectory())
        {
            file.mkdirs();
        }
        
        file = new File(path + fileName);
        
        OutputStream os = null;
        
        try
        {
            os = new FileOutputStream(file);
            
            int length;
            byte[] data = new byte[2048];
            
            while ((length = is.read(data)) != -1)
            {
                os.write(data, 0, length);
            }
            
        }
        catch (FileNotFoundException e)
        {
            e.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                is.close();
                os.close();
            }
            catch (Exception e2)
            {
            }
        }
    }
}

package com.guo.main;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.guo.common.IOUtils;

public class DownPicFromBaidu
{
    public static void main(String[] args)
    {
        /*
         * 搜索关键字
         */
        String wordKey = "girl";
        
        /*
         * inputSream
         */
        InputStream is = null;
        
        try
        {
            String urlencodeKewy = URLEncoder.encode(wordKey, "GBK");
            //百度图片url，返回图片的json数组
            String baiduImageUrl = "http://image.baidu.com/i?tn=baiduimagejson&width=&height=&word="
                    + urlencodeKewy + "&rn=100&pn=2";
            URL url = new URL(baiduImageUrl);
            
            HttpURLConnection connect = (HttpURLConnection) url.openConnection();
            
            //获取url对应的inputStream
            is = connect.getInputStream();
            
            //转换后的String
            String baiduImageStr = IOUtils.getIOUtilsInstance()
                    .conventInputStream2String(is);
            
            JSONObject baiduImageJson = JSONObject.parseObject(baiduImageStr);
            
            JSONArray imageDataJsonArray = baiduImageJson.getJSONArray("data");
            System.out.println(imageDataJsonArray.toString());
            
            for (int i = 0; i < imageDataJsonArray.size() - 1; i++)
            {
                JSONObject imageJosn = (JSONObject) imageDataJsonArray.get(i);
                
                System.out.println("一共查到" + (imageDataJsonArray.size() - 1)
                        + "张图片。");
                
                url = new URL(imageJosn.getString("objURL"));
                
                try
                {
                    connect = (HttpURLConnection) url.openConnection();
                    is = connect.getInputStream();
                    
                    System.out.println("正在下载第" + i + "张，该图片的json流是"
                            + imageJosn.getString("objURL"));
                    System.out.println("图片名称：" + imageJosn.getString("di"));
                    
                    IOUtils.getIOUtilsInstance().conventInpputStream2File(is,
                            "c:/images/" + wordKey + "/",
                            imageJosn.getString("di") + "."
                                    + imageJosn.getString("type"));
                }
                catch (IOException ioe)
                {
                    System.out.println("正在下载第" + i + "张，该图片的json流是"
                            + imageJosn.getString("objURL"));
                    System.out.println("图片名称：" + imageJosn.getString("di"));
                    
                    IOUtils.getIOUtilsInstance().conventInpputStream2File(is,
                            "c:/images/" + wordKey + "/",
                            imageJosn.getString("di") + "."
                                    + imageJosn.getString("type"));
                }
                
            }
            
        }
        catch (Exception e)
        {
            System.out.println(e);
        }
    }
}