Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Copyright (c) 2015, 2016 IBM Corporation. All rights reserved.
 * <p/>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;

public class Main {
    /**
     * Extract the error of an HTTP response as a string.
     * @param connection the connection to read from.
     * @return the string extracted from the connection's error stream.
     * @throws Exception if any error occurs.
     */
    static String readErrorBody(HttpURLConnection connection) throws Exception {
        return readString(new BufferedInputStream(connection.getErrorStream()));
    }

    /**
     * Read a string content from a stream.
     * @param in the stream to read from.
     * @return the string extracted frm the stream.
     * @throws Exception if any error occurs.
     */
    static String readString(InputStream in) throws Exception {
        return new String(readBytes(in), "utf-8");
    }

    /**
     * Read bytes from an HTTP connection.
     * @param connection the connection to read from.
     * @return an array of the bytes read.
     * @throws Exception if any error occurs.
     */
    static byte[] readBytes(HttpURLConnection connection) throws Exception {
        return readBytes(new BufferedInputStream(connection.getInputStream()));
    }

    /**
     * Read a string content from a stream.
     * @param in the stream to read from.
     * @return the raw bytes extracted from the stream.
     * @throws Exception if any error occurs.
     */
    static byte[] readBytes(InputStream in) throws Exception {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buffer = new byte[2048];
        int n;
        while ((n = in.read(buffer)) > 0) {
            out.write(buffer, 0, n);
        }
        out.close();
        return out.toByteArray();
    }
}