开发测试类2

--从文件里面按行读取数据

public class Testbyte {

    /**
     * @param args
     * @throws FileNotFoundException 
     */
    public static void main(String[] args) throws FileNotFoundException {
        File f = new File("C:\11.txt");
        BufferedReader bf = new BufferedReader(new FileReader(f));
        Scanner sc=new Scanner(bf);
        //Scanner sc=new Scanner(new FileReader("c:\22.txt"));
        System.out.println(sc.toString());
        String line=null;
        while((sc.hasNextLine()&&(line=sc.nextLine())!=null)){
            if(!sc.hasNextLine())
            System.out.println(line);
        }

    }

}

--Continue用法

public class TestContinue {

    /**
     * @param args
     */
    public static void main(String[] args) {
        for(int i=0;i<10;i++){
            if(i==5){
                continue;
            }
            System.out.println(i);
        }
        
        int a="2222".compareTo("8111");
        System.out.println(a);

    }

}

--在catch里面return也是可以的
public class TestExcp {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String q=testExcp();
        System.out.println(q);

    }
    private static String  testExcp(){
        String a=null;
        try{
            a.equals("1");
        }catch (Exception e) {
            return "1";
        }
        return "12";
    }

}

--finally在return之后执行
public class TestFinally {

    /**
     * @param args
     */
    public static void main(String[] args) {
        test();
    }
    private static String test(){
        try{
            System.out.println("1111");
            return test1();
            
        }catch (Exception e) {
            // TODO: handle exception
        }
        finally{
            
            System.out.println("22222");
        }
        return null;
    }
　　 private static String test1(){
	    	System.out.println("return out");
	    	return null;
	    }

}

public class TestJson {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        File file=new File("c://json.txt");
        FileInputStream fis=new FileInputStream(file);
        byte[] b=new byte[2048];
        fis.read(b);
        String jsonString =new String(b);
        jsonString =jsonString.trim();
        System.out.println("json字符串:
"+jsonString);
        jsonString=jsonString.replaceAll("
|
", "");
        System.out.println("json字符串:
"+jsonString);
        JSONObject jb = JSONObject.fromObject(jsonString);
        JSONArray ja = jb.getJSONArray("term_params");
        String datetime=jb.getString("datetime");
        System.out.println("datetime_____:"+datetime);
        for (int i = 0; i < ja.size(); i++) {
            String sn=ja.getJSONObject(i).getString("sn");
            System.out.println("sn_____:"+sn);
            String keyParamJson=ja.getJSONObject(i).getString("key_params");
            System.out.println("keyParamJson_______"+keyParamJson);
            //替换[ 和 ]
            keyParamJson=keyParamJson.replaceAll("(\[)", "");
            keyParamJson=keyParamJson.replaceAll("(\])", "");
            System.out.println("keyParamJson_______"+keyParamJson);
            JSONObject jbParams = JSONObject.fromObject(keyParamJson);
            String a=jbParams.getString("auk_data");
            System.out.println("auk_data____:"+a);
        }
        

    }

}

public class TestLen {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        File file=new File("c://11.txt");
        try {
            FileInputStream fis=new FileInputStream(file);
            byte[] b=new byte[4];
            fis.read(b);
            byte[] c=new byte[4];
            fis.read(c);
            //String len = new String(b,"ISO-8859-1");
            String len = new String(b);
            System.out.println(len);
            
            String cstr = new String(c);
            System.out.println(cstr);
            int lenInt=Integer.valueOf(len);
            System.out.println(lenInt);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

}

public class TestNewLine {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String a="111";
        String b="
";
        String c=a+b;
        System.out.println(c.length());
        System.out.println(c);

    }

}

public class TestRandom {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Random r=new Random();
        int a=r.nextInt(6000);
        System.out.println(a);

    }

}

public class TestReturn {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String a = a();
        System.out.println(a);
    }

    private static String a() {
        if (true) {
            if (true) {
                return "2";
            }
            return "1";
        }
        return null;
    }

}

public class TestSplit {

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        File f = new File("C:\11.txt");
        BufferedReader bf = new BufferedReader(new FileReader(f));
        String str;
        String sourceLen = bf.readLine();
        System.out.println(sourceLen);
        int lengthAll = sourceLen.length();
        int lengthLast = 0;
        String mac = null;
        while ((str = bf.readLine()) != null) {
            System.out.println("总长度" + lengthAll);
            System.out.println("本次长度" + str.trim().length());
            System.out.println("上一个数据长度" + lengthLast);
            if (lengthLast == 0 || lengthLast == str.trim().length()) {

                lengthAll = lengthAll + str.length();
                String[] s = str.split(",");
                System.out.println(s[1]);
                lengthLast = str.trim().length();
            } else {
                mac = str;
                System.out.println("MAC:" + mac);
            }

        }

    }

}

public class TestTime {

    /**
     * @param args
     */
    public static void main(String[] args) {
         Date date = new Date();
         System.out.println(date.getTime()-5555);
         System.out.println(new Date());
    }

}

public class TestVarArgus {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String a=null;
        String b="1";
        String c="dsada";
        verifyString(c,a,b);

    }
    private static void verifyString(String...msgs){
        for(String s:msgs){
            if(StringUtil.isEmpty(s)){
                System.out.println("ok");
                break;
            }
            System.out.println(s);
        }
    }

}

public static void main(String[] args) {        test();    }    private static String test(){        try{            System.out.println("1111");            return test1();                    }catch (Exception e) {            // TODO: handle exception        }        finally{                        System.out.println("22222");        }        return null;    }    private static String test1(){    System.out.println("return out");    return null;    }