pangzaifei

Android图片墙，解决oom 20140714

图片墙，解决oom，Android Demo.

我们经常会使用listView或者gridView等来加载大量的图片，一般在加载图片的过程中，都会进行图片的处理。之前使用softRefrence,现在不提倡使用（原因可以百度一下），现在主流是使用Lrucache来处理图片。Lrucache也不是万能的，有时也会抛oom异常，那么我们怎么来处理图片，来尽量让大图片展示，而不报oom呢？

直接看代码：

新建一个图片墙的Android工程。

Demo.java主Activity

这里就只有一个GridView。

package com.pangzaifei.photowall;

import android.app.Activity;
import android.os.Bundle;
import android.widget.GridView;

/**
 * 图片墙(使用lrucache解决oom)
 * 
 * @author pangzf
 * @date 2014年7月14日 下午3:43:30
 */
public class Demo extends Activity {

    private GridView mGv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo);

        mGv = (GridView) findViewById(R.id.gv);
        mGv.setAdapter(new GridViewAdapter(Images.imageUrls, Demo.this, mGv));
    }

}

我们都知道GridView需要设置adapter来填充数据

新建一个GridViewAdapter.java类

package com.pangzaifei.photowall;

import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashSet;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.support.v4.util.LruCache;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;

/**
 * gridview适配器
 * 
 * @author pangzf
 * @date 2014年7月14日 下午3:42:44
 */
public class GridViewAdapter extends BaseAdapter implements OnScrollListener {
    private String[] mImages;
    private LayoutInflater mInfalater;
    private Context mContext;
    private ImageView mIv;
    private LruCache<String, Bitmap> mMemoryCache;
    private GridView mGv;
    private int mVisibleItemCount;
    private int mFirstVisibleItem;
    private boolean isFirst = true;
    private HashSet<DownLoadBitMapTask> mTaskSet;

    public GridViewAdapter(String[] images, Context context, GridView gridview) {
        this.mImages = images;
        this.mInfalater = LayoutInflater.from(context);
        this.mContext = context;
        this.mGv = gridview;

        int maxSize = (int) Runtime.getRuntime().maxMemory();
        mMemoryCache = new LruCache<String, Bitmap>(maxSize / 8) {

            @Override
            protected int sizeOf(String key, Bitmap value) {
                return value.getByteCount();
            }

        };
        mTaskSet = new HashSet<GridViewAdapter.DownLoadBitMapTask>();
        mGv.setOnScrollListener(this);
    }

    @Override
    public int getCount() {
        return mImages.length;
    }

    @Override
    public Object getItem(int position) {
        return mImages[position];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = null;
        if (convertView == null) {
            view = mInfalater.inflate(R.layout.gridview_item, null);
        } else {
            view = convertView;
        }
        String url = (String) getItem(position);
        mIv = (ImageView) view.findViewById(R.id.iv_gridview_item);
        mIv.setTag(url);

        // 去lrucache里拿图片
        Bitmap bitMap = getBitMapFromMemory(url);
        if (bitMap != null) {
            mIv.setImageBitmap(bitMap);

        } else {
            mIv.setImageResource(R.drawable.ic_launcher);
        }
        return view;
    }

    private Bitmap getBitMapFromMemory(String imageUrl) {
        if (!"".equals(imageUrl)) {
            Bitmap bitmap = mMemoryCache.get(imageUrl);
            if (bitmap != null) {
                return bitmap;
            }
            return null;
        }
        return null;
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
            loadBitMaps(mVisibleItemCount, mFirstVisibleItem);
        } else {
            // 取消下载任务
            cancellTasks();
        }

    }

    private void cancellTasks() {
        if (mTaskSet != null && mTaskSet.size() > 0) {
            for (DownLoadBitMapTask task : mTaskSet) {
                task.cancel(true);
            }
        }
    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        this.mVisibleItemCount = visibleItemCount;
        this.mFirstVisibleItem = firstVisibleItem;
        // 滑动加载图片,解决第一次加载的时候就下载图片
        if (isFirst && visibleItemCount > 0) {
            loadBitMaps(mVisibleItemCount, mFirstVisibleItem);
            isFirst = false;
        }

    }

    /**
     * 加载更多图片
     * 
     * @param mVisibleItemCount2
     * @param mFirstVisibleItem2
     */
    private void loadBitMaps(int mVisibleItemCount, int mFirstVisibleItem) {
        // 先去lrucache里获得图片，如果有就图片，就获得iv的tag，将图片set进去，否则开Task网络获取
        for (int i = 0; i < mVisibleItemCount + mFirstVisibleItem; i++) {
            String imageUrl = Images.imageUrls[i];
            if (!"".equals(imageUrl)) {
                Bitmap bitMap = mMemoryCache.get(imageUrl);
                if (bitMap == null) {
                    // 网络加载
                    AsyncTask<String, String, Bitmap> task = new DownLoadBitMapTask();
                    mTaskSet.add((DownLoadBitMapTask) task);
                    task.execute(imageUrl);
                } else {
                    // set设置
                    ImageView iv = (ImageView) mGv.findViewWithTag(imageUrl);
                    iv.setImageBitmap(bitMap);
                }
            }
        }
    }

    /**
     * 下载图片
     * 
     * @author pangzf
     * 
     */
    private class DownLoadBitMapTask extends AsyncTask<String, String, Bitmap> {

        private String imageUrl;

        @Override
        protected Bitmap doInBackground(String... params) {
            imageUrl = params[0];
            Bitmap bitmap = loadBitMap(params[0]);
            if (bitmap != null) {
                // 下载成功之后将bitmap放到lrucache中
                addMemory(imageUrl, bitmap);
            }
            return bitmap;
        }

        @Override
        protected void onPostExecute(Bitmap result) {
            if (!"".equals(imageUrl) && result != null) {
                ImageView iv = (ImageView) mGv.findViewWithTag(imageUrl);
                if (iv != null) {
                    iv.setImageBitmap(result);
                }
                mTaskSet.remove(this);
            }
            super.onPostExecute(result);
        }

        /**
         * 下载
         * 
         * @param imageUrl
         */
        private Bitmap loadBitMap(String imageUrl) {
            Bitmap bitmap = null;
            HttpURLConnection conn = null;
            try {
                URL url = new URL(imageUrl);
                conn = (HttpURLConnection) url.openConnection();
                conn.setConnectTimeout(5000);
                conn.setReadTimeout(10000);
                conn.setDoInput(true);
                conn.setDoOutput(true);

                // 处理图片
                bitmap = BitmapFactory.decodeStream(conn.getInputStream());

            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (conn != null) {
                    conn.disconnect();
                }
            }
            return bitmap;
        }
    }

    /**
     * 将图片添加到lrucache缓存中
     * 
     * @param string
     * @param bitmap
     */
    public void addMemory(String imageUrl, Bitmap bitmap) {
        // if (!"".equals(imageUrl) && bitmap != null) {
        // mMemoryCache.put(imageUrl, bitmap);
        // }
        if (getBitMapFromMemory(imageUrl) == null) {
            mMemoryCache.put(imageUrl, bitmap);
        }
    }

    /**
     * 处理图片
     * 
     * @throws IOException
     */
    // public Bitmap decodeBitMap(HttpURLConnection conn, int reqWidth,
    // int reqHeight) throws IOException {
    // InputStream is = conn.getInputStream();
    //
    // BitmapFactory.Options options = new BitmapFactory.Options();
    // Rect rec = new Rect(0, 0, 0, 0);
    // options.inJustDecodeBounds = true;
    // Bitmap bitmap2 = BitmapFactory.decodeStream(conn.getInputStream(), rec,
    // options);
    // options.inSampleSize = decodeSampleSize(options, reqWidth, reqHeight);
    // options.inJustDecodeBounds = false;
    //
    // Bitmap bitmap = BitmapFactory.decodeStream(conn.getInputStream(), rec,
    // options);
    //
    // return bitmap;
    // }

    /**
     * 获得scmpleSize
     * 
     * @param options
     * @param reqWidth
     * @param reqHeight
     * @return
     */
    // public int decodeSampleSize(Options options, float reqWidth, float
    // reqHeight) {
    // int width = options.outWidth;
    // int height = options.outHeight;
    // int smaleSize = 1;
    // if (width > reqHeight || height > reqHeight) {
    // // 计算比例
    // float fWidth = Math.round(width / reqWidth);
    // float fHeight = Math.round(height / reqHeight);
    // smaleSize = (int) (fWidth > fHeight ? fHeight : fWidth);
    //
    // }
    // return smaleSize;
    // }
}

GridViewAdapter.java主要处理了Lrucache的使用。思路：

1.获得Lrucache实例，需要设置maxSize最大值，上例代码中是使用

getRuntime().maxMemory()

来获得最大内存，使用他的8分之一，大约可以显示一屏幕的图片(百度查一下资料，我这就不提原因了)，在sizeOf()中计算bitmap的大小。

2.在getVie()中为imageview设置图片，这里需要现在lrucache缓存中查看是否有bitmap，getBitMapFromMemory()，如果有就将bitmap获取出来，设置到imageView。

3.重写onScrollerListener(),当滑动的时候加载图片。根据visibleItemCount和totalItemCount来计算需要加载的图片个数和位置，之后在Images数据源类中获得图片相应的url地址。之后调用loadBitMaps（）方法，来加载图片。

首先会到lrucache缓存中查找，如果有就使用，没有会调用DownLoadBitMapTask（）来异步拉取网络上的图片数据。当我们获取到图片bitmap后，将它添加到lrucache缓存中。addMemory（）。

思路大概就是这样，其他一些注意的点是

1.imageview中需要添加setTag(iamgeurl)，添加标记,防止图片复用混乱。

2.mTaskSet是一个HashSet数组，存放的是图片的task连接，当我们离开或者当前页时，需要调用cancellTasks()来停止图片的加载。

如果是大图片如何来处理？

在使用lrucache的基础上我们可以使用BitMapFactory.options()这个来根据width和height来缩放，获得小图。

    /**
     * 处理图片
     * 
     * @throws IOException
     */
    public Bitmap decodeBitMap(HttpURLConnection conn, int reqWidth,
            int reqHeight) throws IOException {
        InputStream is = conn.getInputStream();

        BitmapFactory.Options options = new BitmapFactory.Options();
        Rect rec = new Rect(0, 0, 0, 0);
        options.inJustDecodeBounds = true;
        Bitmap bitmap2 = BitmapFactory.decodeStream(conn.getInputStream(), rec,
                options);
        options.inSampleSize = decodeSampleSize(options, reqWidth, reqHeight);
        options.inJustDecodeBounds = false;

        Bitmap bitmap = BitmapFactory.decodeStream(conn.getInputStream(), rec,
                options);

        return bitmap;
    }

    /**
     * 获得scmpleSize
     * 
     * @param options
     * @param reqWidth
     * @param reqHeight
     * @return
     */
    public int decodeSampleSize(Options options, float reqWidth, float reqHeight) {
        int width = options.outWidth;
        int height = options.outHeight;
        int smaleSize = 1;
        if (width > reqHeight || height > reqHeight) {
            // 计算比例
            float fWidth = Math.round(width / reqWidth);
            float fHeight = Math.round(height / reqHeight);
            smaleSize = (int) (fWidth > fHeight ? fHeight : fWidth);

        }
        return smaleSize;
    }

以上代码是解决大图在小的imageview展示的问题。这样可以防止，太大的图片，占用过多内存。

//以下代码获取的bitmap为null，暂时不知道为什么。我会再查查资料。

 BitmapFactory.decodeStream(conn.getInputStream(), rec,
                options)

但是一般我们会先将图片，保存到sdcard中，然后再用BitmapFactory.decodeFile()方法。在真实项目中会使用这个方法。

布局文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   >
    <GridView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/gv"
        android:columnWidth="90dp"
        android:numColumns="auto_fit"
        android:gravity="center"
        android:verticalSpacing="10dip"
          android:stretchMode="columnWidth"
        ></GridView>
</LinearLayout>

图片源Images.java：

package com.pangzaifei.photowall;

/**
 * 数据源
 * 
 * @author pangzf
 * @date 2014年7月14日 下午3:43:42
 */
public class Images {
    public static final String[] imageUrls = new String[] {

            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/c.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/d.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/i.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/c.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/d.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/i.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/c.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/d.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/i.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/c.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/d.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/i.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/c.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/d.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/i.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/c.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/d.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/i.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/c.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/d.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/i.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/c.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/d.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/e.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/f.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/g.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/h.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/i.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/a.jpg",
            "https://raw.githubusercontent.com/pangzaifei/LineChartView/master/LineChartView/effice_picture/b.jpg",
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}

源码下载：

http://download.csdn.net/detail/pangzaifei/7633297

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浅谈程序员的数学修养
批量执行 bulk collect与forall用法 daizj oracle sql bulk collect forall
BULK COLLECT 子句会批量检索结果，即一次性将结果集绑定到一个集合变量中，并从SQL引擎发送到PL/SQL引擎。通常可以在SELECT INTO、 FETCH INTO以及RETURNING INTO子句中使用BULK COLLECT。本文将逐一描述BULK COLLECT在这几种情形下的用法。有关FORALL语句的用法请参考：批量SQL之 F
Linux下使用rsync最快速删除海量文件的方法 dongwei_6688 OS
1、先安装rsync：yum install rsync 2、建立一个空的文件夹：mkdir /tmp/test 3、用rsync删除目标目录：rsync --delete-before -a -H -v --progress --stats /tmp/test/ log/这样我们要删除的log目录就会被清空了，删除的速度会非常快。rsync实际上用的是替换原理，处理数十万个文件也是秒删。
Yii CModel中rules验证规格 dcj3sjt126com rules yii validate
Yii cValidator主要用法分析： yii验证rulesit 分类： Yii yii的rules验证 cValidator主要属性 attributes ,builtInValidators,enableClientValidation,message,on,safe,skipOnError
基于vagrant的redis主从实验 dcj3sjt126com vagrant
平台: Mac 工具: Vagrant 系统: Centos6.5 实验目的: Redis主从实现思路制作一个基于sentos6.5, 已经安装好reids的box, 添加一个脚本配置从机, 然后作为后面主机从机的基础box 制作sentos6.5+redis的box mkdir vagrant_redis cd vagrant_
Memcached(二)、Centos安装Memcached服务器 frank1234 centos memcached
一、安装gcc rpm和yum安装memcached服务器连接没有找到，所以我使用的是make的方式安装，由于make依赖于gcc，所以要先安装gcc 开始安装，命令如下，[color=red][b]顺序一定不能出错[/b][/color]：建议可以先切换到root用户，不然可能会遇到权限问题：su root 输入密码...... rpm -ivh kernel-head
Remove Duplicates from Sorted List hcx2013 remove
Given a sorted linked list, delete all duplicates such that each element appear only once. For example,Given 1->1->2, return 1->2.Given 1->1->2->3->3, return&
Spring4新特性——JSR310日期时间API的支持 jinnianshilongnian spring4
Spring4新特性——泛型限定式依赖注入 Spring4新特性——核心容器的其他改进 Spring4新特性——Web开发的增强 Spring4新特性——集成Bean Validation 1.1(JSR-349)到SpringMVC Spring4新特性——Groovy Bean定义DSL Spring4新特性——更好的Java泛型操作API Spring4新
浅谈enum与单例设计模式 247687009 java 单例
在JDK1.5之前的单例实现方式有两种(懒汉式和饿汉式并无设计上的区别故看做一种)，两者同是私有构造器，导出静态成员变量，以便调用者访问。第一种 package singleton; public class Singleton { //导出全局成员 public final static Singleton INSTANCE = new S
使用switch条件语句需要注意的几点 openwrt c break switch
1. 当满足条件的case中没有break，程序将依次执行其后的每种条件（包括default）直到遇到break跳出 int main() { int n = 1; switch(n) { case 1: printf("--1--\n"); default: printf("defa
配置Spring Mybatis JUnit测试环境的应用上下文 schnell18 spring mybatis JUnit
Spring-test模块中的应用上下文和web及spring boot的有很大差异。主要试下来差异有：单元测试的app context不支持从外部properties文件注入属性 @Value注解不能解析带通配符的路径字符串解决第一个问题可以配置一个PropertyPlaceholderConfigurer的bean。第二个问题的具体实例是：
Java 定时任务总结一 tuoni java spring timer quartz timertask
Java定时任务总结一.从技术上分类大概分为以下三种方式： 1.Java自带的java.util.Timer类，这个类允许你调度一个java.util.TimerTask任务; 说明： java.util.Timer定时器，实际上是个线程，定时执行TimerTask类 &
一种防止用户生成内容站点出现商业广告以及非法有害等垃圾信息的方法 yangshangchuan rank 相似度计算文本相似度词袋模型余弦相似度
本文描述了一种在ITEYE博客频道上面出现的新型的商业广告形式及其应对方法，对于其他的用户生成内容站点类型也具有同样的适用性。最近在ITEYE博客频道上面出现了一种新型的商业广告形式，方法如下： 1、注册多个账号（一般10个以上）。 2、从多个账号中选择一个账号，发表1-2篇博文