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Utils library for enterprise applications
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package org.swiftboot.util;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

/**
 * 简单的 IO 处理工具类，只能处理文件流
 *
 * @author swiftech
 */
public class IoUtils {

    /**
     * 从输入流中读取所有字节内容（不能用于大数据量）
     *
     * @param ins
     * @return
     */
    public static byte[] readAllToBytes(InputStream ins) {
        try {
            int len = ins.available();
            byte[] data = new byte[len];
            if (ins.read(data) != -1) {
                return data;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 从输入流中读取所有字符串内容（不能用于大数据量）
     *
     * @param ins
     * @return
     */
    public static String readAllToString(InputStream ins) {
        return new String(readAllToBytes(ins));
    }

    /**
     * @param ins
     * @return
     * @deprecated
     */
    public static String readAll(InputStream ins) {
        return new String(readAllToBytes(ins));
    }

    /**
     * Read data stream form {@link Reader} as String.
     *
     * @param reader
     * @return
     * @throws IOException
     */
    public static String readAllToString(Reader reader) throws IOException {
        StringBuilder buf = new StringBuilder();
        while (reader.ready()) {
            buf.append((char) reader.read());
        }
        return buf.toString();
    }

    /**
     * 从输入流中按行读取所有字符串内容
     *
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static List readToStringList(InputStream inputStream) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        List array = new ArrayList<>();
        String line;
        while ((line = reader.readLine()) != null) {
            array.add(line);
        }
        return array;
    }

    /**
     * 从输入流中按行读取所有字符串内容
     *
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static String[] readToStringArray(InputStream inputStream) throws IOException {
        return readToStringList(inputStream).toArray(new String[]{});
    }
}