util.java

eclipse rcp 项目实例

package com.niis.myprice.util.sys;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;

import org.apache.log4j.Logger;

public class Util {
	private static final Logger logger=Logger.getLogger(Util.class);
	private Util() {
	}
	public static StringBuffer loadStringBufferFromStream(InputStream in,String cs) throws IOException {
		InputStreamReader reader = new InputStreamReader(in, cs);
		StringBuffer buffer = new StringBuffer(1024);
		char cb[] = new char[1024];
		while (true) {
			int len = reader.read(cb, 0, 1024);
			if (len == -1)
				break;
			buffer.append(cb, 0, len);
		}
		return buffer;
	}
    public static boolean isInteger(Object input) {
        if (input == null) {
            return false;
        }
        else {
            String in = (String) input;
            in = in.trim();
            if (in.equals("")) {
                return true;
            }
            if (in.matches("\\d*")) {
                return true;
            }

            return false;
        }
    }

    public static boolean isDigit(Object input, int len1, int len2) {
        if (input == null) {
            return false;
        }
        else {
            String in = (String) input;

            String[] values = in.split("\\.");
            if (values.length > 2) {
                return false;
            }
            if (len2 == 0 && values.length > 1) {
                return false;
            }

            if (len1 > 0) {
                if (!values[0]
                    .matches("\\d{0," + String.valueOf(len1) + "}")) {
                    return false;
                }
            }
            else if (len1 == 0) {
                if (!values[0].matches("0*")) {
                    return false;
                }
            }

            if (len2 > 0) {
                if (values.length > 1
                    && !values[1].matches(
                        "\\d{0," + String.valueOf(len2) + "}")) {
                    return false;
                }
            }
            else if (len2 == 0 && values.length > 1) {
                if (!values[1].matches("0*")) {
                    return false;
                }
            }

            return true;
        }
    }

    public static boolean isDigit(Object input, int len1) {
        return isDigit(input, len1, 0);
    }

    public static boolean isDigit(Object input) {
        if (input == null) {
            return false;
        }
        else {
            String in = (String) input;
            if (in.equals("")) {
                return true;
            }
            if (in.matches("\\d*\\.\\d*")) {
                return true;
            }

            return false;
        }
    }
}