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    騎豬闖天下
    

    J2ME隨筆,記錄成長的腳步
    

    


    
	
		

    統計
    
	
		

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			[J2ME]斷點續傳
		
    
		
    
斷點續傳的頭信息設置：
    
conn.setRequestProperty("RANGE", "bytes=" + size + "-"); //斷點續傳 
    

    
項目中使用斷點續傳，頭信息的屬性按上面設置好了，但無論怎么測試，就是不能實現，費了一天又一個晚上的功夫才查到問題所在，在使用斷點續傳的時候，頭信息的聯網方式設為了post，導致無法續傳！
    

    
實踐證明要實現斷點續傳：聯網方式必須使用get方式，或默認不設置。
    

    
以下是斷點續傳的部分代碼：
    

    package com.xuudoo.booking;
    

    
    import java.io.DataInputStream;
    
    import java.io.IOException;
    
    import javax.microedition.io.Connector;
    
    import javax.microedition.io.HttpConnection;
    
    import javax.microedition.rms.InvalidRecordIDException;
    
    import javax.microedition.rms.RecordEnumeration;
    
    import javax.microedition.rms.RecordStoreException;
    
    import javax.microedition.rms.RecordStoreNotOpenException;
    

    
    import com.xuudoo.ewl.EWLScreen;
    

    
    public class DownloadTool implements Runnable {
    
        public XItem item;//當前下載的item
    
        public String imageName;//當前下載的書名
    
        public int FocusID;//當前下載的ID
    

    
        public HttpConnection conn = null;
    
        public DataInputStream dis = null;
    
        public RMSRecorderIfno rms;//存放下載的漫畫數據
    
        public RMSRecorderIfno rms1;//存放下載的url和數據節點個數
    
        public RMSRecorderIfno rms2; //存放廢字節長度
    

    
        public DownloadTool(XItem xitem,int focusID) {
    
        item     = xitem;
    
        imageName     = xitem.itemId;
    
        FocusID     = focusID;
    
    }
    

    
        public void run() {
    
        UIManager.isLoading     = true;
    
            try {
    
            System.gc();
    
            String url     = "";
    
                if (item.isResume){
    
                downloadFileagain(url);
    
            }    else{
    
                url     = UIManager._currMgz.mgzLocate;
    
                downloadFile(url);
    
            }
    
            UIManager._instance.doLoop();
    
                do {
    
                    if (UIManager._instance.downloadurl == null)
    
                        break;
    
                    for (int i = 0; i < UIManager._instance.downloadurl.size();) {
    
                    url     = (String) UIManager._instance.downloadurl.elementAt(i);
    
                    item     = (XItem) UIManager._instance.downloaditem.elementAt(i);
    
                    imageName     = item.itemId;
    
                    FocusID     = Integer.parseInt((String) UIManager._instance.downloadid.elementAt(i));
    
                        if (item.isResume)
    
                        downloadFileagain(url);
    
                        else
    
                        downloadFile(url);
    
                        break;
    
                }
    
                UIManager._instance.downloadurl.removeElement(url);
    
                UIManager._instance.downloaditem.removeElement(item);
    
                UIManager._instance.downloadid.removeElement(Integer.toString(FocusID));
    
                UIManager._instance.doLoop();
    
            }     while (UIManager._instance.downloadurl != null && UIManager._instance.downloadurl.size() >= 1);
    
        }     catch (Exception e) {
    
                if(BookingMidlet.DEBUG)
    
                e.printStackTrace();
    
        }     finally {
    
            UIManager.isLoading     = false;
    
            UIManager._instance.doLoop();
    
        }
    
    }
    

    
        public synchronized void StopDownLoadThread() {
    
            if (conn != null) {
    
            notify();
    
            Close();
    
        }
    
    }
    

    
        public synchronized void CloseMidlet() {
    
            if (dis != null) {
    
                try {
    
                dis.close();
    
            }     catch (IOException e) {
    
                e.printStackTrace();
    
            }
    
            dis     = null;
    
        }
    
            if (conn != null) {
    
            notify();
    
                try {
    
                conn.close();
    
            }     catch (IOException e) {
    
                e.printStackTrace();
    
            }
    
            conn     = null;
    
        }
    
            if (rms != null) {
    
            rms.close();
    
            rms      = null;
    
        }
    
            if (rms1 != null) {
    
            rms1.close();
    
            rms1      = null;
    
        }
    
            if (rms2 != null) {
    
            rms2.close();
    
            rms2      = null;
    
        }
    
            if(UIManager._instance._percent != null)
    
            UIManager._instance._percent     = null;
    
    }
    
    
    
        private void Close() {
    
            if (dis != null) {
    
                try {
    
                dis.close();
    
            }     catch (IOException e) {
    
                e.printStackTrace();
    
            }
    
            dis     = null;
    
        }
    
            if (conn != null) {
    
                try {
    
                conn.close();
    
            }     catch (IOException e) {
    
                e.printStackTrace();
    
            }
    
            conn     = null;
    
        }
    
            try {
    
            Thread.sleep(    500);
    
                if(BookingMidlet.DEBUG)
    
                System.out.println(    "-----關閉連接和RMS.");
    
        }     catch (Exception ex) {
    
                //
    
            }
    
            if (rms != null) {
    
            rms.close();
    
            rms      = null;
    
        }
    
            if (rms1 != null) {
    
            rms1.close();
    
            rms1      = null;
    
        }
    
            if (rms2 != null) {
    
            rms2.close();
    
            rms2      = null;
    
        }
    
            if(UIManager._instance._percent != null)
    
            UIManager._instance._percent     = null;
    
    }
    

    
        private int xcblength = 0; //整個xcb記錄個數
    

    
        public void downloadFile(String url){
    
            if (RMSRecorderIfno.exists("002_" + imageName + "_mgz"))
    
            RMSRecorderIfno.delete(    "002_" + imageName + "_mgz");
    
        rms     = new RMSRecorderIfno();
    
        rms.open(    "002_" + imageName + "_mgz", true);
    
            //
    
            rms2 = new RMSRecorderIfno();
    
            if (RMSRecorderIfno.exists("002_" + imageName + "_byte")) {
    
            RMSRecorderIfno.delete(    "002_" + imageName + "_byte");
    
        }
    
        rms2.open(    "002_" + imageName + "_byte", true);
    

    
        rms1     = new RMSRecorderIfno();
    
        rms1.open(    "002_" + imageName + "_url", true);
    
            byte[] urlbyte = url.getBytes();
    
        rms1.openWriteStream();
    
        rms1.write(urlbyte);
    
        rms1.addRecord(rms1.saveStreamToByteArray());
    
        rms1.closeWriteStream();
    
        String precentstr     = "0";// 下載進度的百分比
    
            
    
            try {
    
                //S40_V3版本需通過cmwap才能下載
    
                if (!BookingMidlet.useProxy){
    
                conn     = (HttpConnection)Connector.open(url);
    
            }     else {
    
                String remainUrl     = url.substring("http://".length());
    
                    int index = remainUrl.indexOf("/");
    
                String path     = "";
    
                    if (index != -1) {
    
                    path     = remainUrl.substring(index);
    
                    remainUrl     = remainUrl.substring(0, index);
    
                }
    
                String host     = "";
    
                String port     = "";
    
                index     = remainUrl.indexOf(":");
    
                    if (index != -1) {
    
                    host     = remainUrl.substring(0, index);
    
                    port     = remainUrl.substring(index + 1);
    
                }     else {
    
                    host     = remainUrl;
    
                    port     = null;
    
                }
    
                String proxyHost     = "10.0.0.172";
    
                String proxyPort     = "80";
    
                String cnwapUrl     = "http://" + proxyHost + ":" + proxyPort + path;
    
                conn     = (HttpConnection) Connector.open(cnwapUrl);
    
                    if (port == null)
    
                    conn.setRequestProperty(    "X-Online-Host", host);
    
                    else
    
                    conn.setRequestProperty(    "X-Online-Host", host + ":" + port);
    
            }
    
            dis     = conn.openDataInputStream();
    
                // begin analyze db file
    
                dis.skip(0x50L);//RMS頭 80個字節
    
                int recNum = dis.readInt();//xcb文件的節點數，4個字節
    
                rms1.openWriteStream();
    
            rms1.write(recNum);
    
            rms1.addRecord(rms1.saveStreamToByteArray());
    
            rms1.closeWriteStream();
    
            dis.skip(    0x1CL);//28個字節的廢字節
    
                for (int i = 0; i < recNum; i++) {
    
                    if (BookingMidlet.limitDownloadSpeed){
    
                        try {
    
                        Thread.sleep(    1000);
    
                    }     catch (Exception ex) {
    
                            //
    
                        }
    
                }
    
                EWLScreen.instance.repaint();
    
                    //16個字節是節點頭
    
                    dis.readInt();//4個字節的當前節點的序號
    
                    dis.readInt();//4個字節的廢字節
    
                    int occupied = dis.readInt();//4個字節表示當前節點所在內存大小
    
                    int recsize = dis.readInt();//4個字節表示當前節點的實際大小
    
                    byte recdata[] = new byte[recsize];
    
                dis.readFully(recdata);
    
                
    
                    if(BookingMidlet.DEBUG)
    
                    System.out.println(    "-----save rms data: "+recsize);
    
                    // 以下代碼用以計算下載百分比
    
                    precentstr = "" + (100 * DownPrecent(rms)) / (recNum + 0.01);
    
                precentstr     = forMatString(precentstr);
    
                UIManager._instance.set_percent(precentstr, FocusID);
    
                EWLScreen.prompt2     = precentstr;
    
                    ////////////////////////////////////////////////////////////////////////
    
                    rms.openWriteStream();
    
                rms.write(recdata);
    
                rms.addRecord(rms.saveStreamToByteArray());
    
                rms.closeWriteStream();
    
                
    
                    //保存節點后面的廢字節，以便續傳時使用
    
                    int Wastebytes = occupied - recsize - 16;
    
                rms2.openWriteStream();
    
                rms2.write(Wastebytes);
    
                rms2.addRecord(rms2.saveStreamToByteArray());
    
                rms2.closeWriteStream();
    
                dis.skip(Wastebytes);     // subtract rec header
    
                }
    

    
            UIManager._instance.removeDownloadingItem(item);
    
            UIManager._instance.openDownloaded();
    
            UIManager._instance.insertDownloaded(item);
    
        }     catch (Exception e) {
    
                if(BookingMidlet.DEBUG){
    
                System.out.println(    "-----中斷下載。");
    
            }
    
    //            UIManager.showAlert("下載失敗！請刪除后重新下載");
    
            }     finally {
    
            Close();
    
        }
    
    }
    
    
    
        public void downloadFileagain(String url){
    
            try {
    
                if (RMSRecorderIfno.exists("002_" + imageName + "_mgz") && !item.isResume)
    
                RMSRecorderIfno.delete(    "002_" + imageName + "_mgz");
    
            rms     = new RMSRecorderIfno();
    
            rms.open(    "002_" + imageName + "_mgz", true);
    
                //
    
                rms2 = new RMSRecorderIfno();
    
                if (RMSRecorderIfno.exists("002_" + imageName + "_byte") && !item.isResume) {
    
                RMSRecorderIfno.delete(    "002_" + imageName + "_byte");
    
            }
    
            rms2.open(    "002_" + imageName + "_byte", true);
    
            
    
                //以下代碼用以斷點續傳
    
                rms1 = new RMSRecorderIfno();
    
            rms1.open(    "002_" + imageName + "_url", false);
    
            url     = setValue(rms1);
    
                ////////////////////////////////////////////////////////////////////////////
    
                String precentstr = "0";// 下載進度的百分比
    
                precentstr = "" + (100 * DownPrecent(rms)) / (xcblength);
    
            precentstr     = forMatString(precentstr);
    
            UIManager._instance.set_percent(precentstr, FocusID);
    
                //S40_V3版本需通過cmwap才能下載
    
                if (!BookingMidlet.useProxy){
    
                conn     = (HttpConnection)Connector.open(url);
    
            }     else {
    
                String remainUrl     = url.substring("http://".length());
    
                    int index = remainUrl.indexOf("/");
    
                String path     = "";
    
                    if (index != -1) {
    
                    path     = remainUrl.substring(index);
    
                    remainUrl     = remainUrl.substring(0, index);
    
                }
    
                String host     = "";
    
                String port     = "";
    
                index     = remainUrl.indexOf(":");
    
                    if (index != -1) {
    
                    host     = remainUrl.substring(0, index);
    
                    port     = remainUrl.substring(index + 1);
    
                }     else {
    
                    host     = remainUrl;
    
                    port     = null;
    
                }
    
                String proxyHost     = "10.0.0.172";
    
                String proxyPort     = "80";
    
                String cnwapUrl     = "http://" + proxyHost + ":" + proxyPort + path;
    
                conn     = (HttpConnection) Connector.open(cnwapUrl);
    
                    if (port == null)
    
                    conn.setRequestProperty(    "X-Online-Host", host);
    
                    else
    
                    conn.setRequestProperty(    "X-Online-Host", host + ":" + port);
    
            }
    
                //設置Range
    
                int skipNum = RmsSize(rms, rms2);
    
            
    
                if (skipNum == 112) {
    
                dis     = conn.openDataInputStream();
    
                dis.skip(    0x50L);//RMS頭 80個字節
    
                    xcblength = dis.readInt();//xcb文件的節點數，4個字節
    
                    rms1.openWriteStream();
    
                rms1.write(xcblength);
    
                rms1.setRecord(    2, rms1.saveStreamToByteArray());
    
                rms1.closeWriteStream();
    
                dis.skip(    0x1CL);//28個字節的廢字節
    
                }    else{
    
                conn.setRequestProperty(    "RANGE", "bytes=" + skipNum + "-");//斷點續傳
    
                    dis = conn.openDataInputStream();
    
            }
    
            item.isResume     = false;
    
                int num = DownPrecent(rms);
    
                for (int i = 0; i < xcblength - num; i++) {
    
                    if (BookingMidlet.limitDownloadSpeed){
    
                        try {
    
                        Thread.sleep(    1000);
    
                    }     catch (Exception ex) {
    
                            //
    
                        }
    
                }
    
                EWLScreen.instance.repaint();
    
                    //16個字節是節點頭
    
                    dis.readInt();//4個字節的當前節點的序號
    
                    dis.readInt();//4個字節的廢字節
    
                    int occupied = dis.readInt();//4個字節表示當前節點所在內存大小
    
                    int recsize = dis.readInt();//4個字節表示當前節點的實際大
    
                    byte recdata[] = new byte[recsize];
    
                dis.readFully(recdata);
    

    
                rms.openWriteStream();
    
                rms.write(recdata);
    
                rms.addRecord(rms.saveStreamToByteArray());
    
                rms.closeWriteStream();
    

    
                precentstr     = "" + (100 * DownPrecent(rms)) / (xcblength);
    
                precentstr     = forMatString(precentstr);
    
                UIManager._instance.set_percent(precentstr, FocusID);
    

    
                    //保存節點后面的廢字節，以便續傳時使用
    
                    int Wastebytes = occupied - recsize - 16;
    
                rms2.openWriteStream();
    
                rms2.write(Wastebytes);
    
                rms2.addRecord(rms2.saveStreamToByteArray());
    
                rms2.closeWriteStream();
    
                dis.skip(Wastebytes);     // subtract rec header
    
                }
    

    
            UIManager._instance.removeDownloadingItem(item);
    
            UIManager._instance.openDownloaded();
    
            UIManager._instance.insertDownloaded(item);
    
        }     catch (Exception e) {
    
                if(BookingMidlet.DEBUG){
    
                System.out.println(    "-----中斷下載。");
    
            }
    
                //UIManager.showAlert("下載失敗！請刪除后重新下載");
    
            }     finally {
    
            Close();
    
        }
    

    
    }
    

    
        /**
    
     * 計算百分比
    
     *     @param str
    
     *     @return
    
         */
    
        public static String forMatString(String str) {
    
        String values;
    
            int index = str.indexOf(".");
    
            if(index != -1){
    
            values     = str.substring(0, index);
    
        }    else{
    
            values     = str;
    
        }
    
            return values;
    
    }
    

    
        /**
    
     *  遍歷RMS，得到當前記錄個數
    
     *     @param rms
    
     *     @return
    
         */
    
        public int DownPrecent(RMSRecorderIfno rms) {
    
            int i = 0;
    
            try {
    
            RecordEnumeration enu     = null;
    
                if (enu == null) {
    
                enu     = rms.rs.enumerateRecords(null, null, false);
    
            }
    
                while (enu.hasNextElement()) {
    
                    try {
    
                    enu.nextRecordId();
    
                }     catch (InvalidRecordIDException e) {
    
                    e.printStackTrace();
    
                }
    
                i    ++;
    
            }
    
        }     catch (RecordStoreNotOpenException e) {
    
            e.printStackTrace();
    
        }
    
            return i;
    
    }
    

    
        /**
    
     *  遍歷RMS，計算當前記錄的長度
    
     *     @param rms
    
     *     @param rms1
    
     *     @return
    
         */
    
        public int RmsSize(RMSRecorderIfno _rms, RMSRecorderIfno _rms2) {
    
            int i = 112;
    
            try {
    
            RecordEnumeration enu     = null;
    
                if (enu == null) {
    
                enu     = _rms.rs.enumerateRecords(null, null, false);
    
            }
    
                while (enu.hasNextElement()) {
    
                    try {
    
                    i     += enu.nextRecord().length;
    
                    i     += 16;
    
                }     catch (InvalidRecordIDException e) {
    
                    e.printStackTrace();
    
                }     catch (RecordStoreException e) {
    
                    e.printStackTrace();
    
                }
    
            }
    
        }     catch (RecordStoreNotOpenException e) {
    
            e.printStackTrace();
    
        }
    
        i     = i + sikpSize(_rms2);
    
            return i;
    
    }
    

    
        /**
    
     *  遍歷RMS，計算rms中各個節點后跳過的節點大小
    
     *     @param rms
    
     *     @return
    
         */
    
        public int sikpSize(RMSRecorderIfno _rms2) {
    
            int len = 0;
    
            try {
    
            RecordEnumeration enu     = null;
    
                if (enu == null) {
    
                enu     = _rms2.rs.enumerateRecords(null, null, false);
    
            }
    
                while (enu.hasNextElement()) {
    
                    try {
    
                    len     += bytesToInt(enu.nextRecord());
    
                }     catch (InvalidRecordIDException e) {
    
                    e.printStackTrace();
    
                }     catch (RecordStoreException e) {
    
                    e.printStackTrace();
    
                }
    
            }
    
        }     catch (RecordStoreNotOpenException e) {
    
            e.printStackTrace();
    
        }
    
        
    
            return len;
    
    }
    

    
        /**
    
     * byte轉int
    
     *     @param bytes
    
     *     @return
    
         */
    
        public static int bytesToInt(byte[] bytes) {
    
            int result = 0;
    
            for (int i = 0; i < bytes.length; i++) {
    
            result     <<= 8;
    
            result     |= (bytes[i] & 0xff); //此處忽略byte的符號位   
    
            }
    
            return result;
    
    }
    
    
    
        private String setValue(RMSRecorderIfno rms){
    
        String url     = "";
    
        RecordEnumeration enu     = null;
    
            if (enu == null) {
    
                try {
    
                enu     = rms.rs.enumerateRecords(null, null, false);
    
            }     catch (RecordStoreNotOpenException e) {
    
                e.printStackTrace();
    
            }
    
                int i = 0;
    
                while (enu.hasNextElement()) {
    
                    try {
    
                    i     = enu.nextRecordId();
    
                        if (i == 1) {
    
                        url     = new String(rms.getRecord(i));
    
                    }     else if (i == 2) {
    
                        xcblength     = bytesToInt(rms.getRecord(i));
    
                    }
    
                }     catch (InvalidRecordIDException e) {
    
                    e.printStackTrace();
    
                }
    
            }
    
        }
    
            return url;
    
    }
    
}
    

    
    

		
    
			posted on 2010-02-25 14:58 騎豬闖天下 閱讀(346) 評論(0)  編輯  收藏  
		
    
	
    
	
	


	


    
	    
    




    





    


    

	
    
		
    
				
		
	
		
    
		
		
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