UUIDUtils

自动生成uuid的工具类，适用于数据库的唯一id

import java.net.InetAddress;

public abstract class UUIDUtils {

    private static UUIDGenerator uuid = new UUIDGenerator();

    /**
     * 产生新的UUID
     *
     * @return 32位长的UUID字符串
     */
    public static String newId() {
        return uuid.generateHex();
    }

    private static class UUIDGenerator {

        private static final int IP;
        static {
            int ipadd;
            try {
                ipadd = toInt(InetAddress.getLocalHost().getAddress());
            } catch (Exception e) {
                ipadd = 0;
            }
            IP = ipadd;
        }

        private static short counter = (short) 0;
        private static final int JVM = (int) (System.currentTimeMillis() >>> 8);

        /**
         * 构造方法
         */
        public UUIDGenerator() {
        }

        /**
         * 生成16进制表达的字符串 UUID，其中字母采用小写形式。
         *
         * @return 32个字节长度的 UUID 字符串
         */
        public String generateHex() {
            StringBuilder sb = new StringBuilder(32);
            sb.append(format(getIP()));
            sb.append(format(getJVM()));
            sb.append(format(getHighTime()));
            sb.append(format(getLowTime()));
            sb.append(format(getCount()));
            return sb.toString();
        }

        private String format(int intval) {
            String formatted = Integer.toHexString(intval);
            StringBuilder buf = new StringBuilder("00000000");
            buf.replace(8 - formatted.length(), 8, formatted);
            return buf.toString();
        }

        private String format(short shortval) {
            String formatted = Integer.toHexString(shortval);
            StringBuilder buf = new StringBuilder("0000");
            buf.replace(4 - formatted.length(), 4, formatted);
            return buf.toString();
        }

        /**
         * Unique across JVMs on this machine (unless they load this class in the same quater second - very unlikely)
         */
        private int getJVM() {
            return JVM;
        }

        /**
         * Unique in a millisecond for this JVM instance (unless there are > Short.MAX_VALUE instances created in a
         * millisecond)
         */
        private short getCount() {
            synchronized (UUIDGenerator.class) {
                if (counter < 0) {
                    counter = 0;
                }
                return counter++;
            }
        }

        /**
         * Unique in a local network
         */
        private int getIP() {
            return IP;
        }

        /**
         * Unique down to millisecond
         */
        private short getHighTime() {
            return (short) (System.currentTimeMillis() >>> 32);
        }

        private int getLowTime() {
            return (int) System.currentTimeMillis();
        }

        private static int toInt(byte[] bytes) {
            int result = 0;
            for (int i = 0; i < 4; i++) {
                result = (result << 8) - Byte.MIN_VALUE + bytes[i];
            }
            return result;
        }
    }

}

HttpClientUtils

用于发送http请求的工具类，由纯净的java语言实现

原作者链接HttpClient工具类

HttpClientResult

package com.example.qcserver.util.http;

import java.io.Serializable;


public class HttpClientResult implements Serializable {

    private static final long serialVersionUID = -343034723830608520L;
    /**
     * 响应状态码
     */
    private int code;

    /**
     * 响应数据
     */
    private String content;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public HttpClientResult(int code, String content) {
        this.code = code;
        this.content = content;
    }

    public HttpClientResult(int code) {
        this.code = code;
    }
}

HttpClientUtils

package com.example.qcserver.util.http;

import com.example.qcserver.util.http.HttpClientResult;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.*;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.*;


public class HttpClientUtils {

    // 编码格式。发送编码格式统一用UTF-8
    private static final String ENCODING = "UTF-8";

    // 设置连接超时时间，单位毫秒。
    private static final int CONNECT_TIMEOUT = 6000;

    // 请求获取数据的超时时间(即响应时间)，单位毫秒。
    private static final int SOCKET_TIMEOUT = 6000;

    /**
     * 发送get请求；不带请求头和请求参数
     *
     * @param url 请求地址
     * @return
     * @throws Exception
     */
    public static HttpClientResult doGet(String url) throws Exception {
        return doGet(url, null, null);
    }

    /**
     * 发送get请求；带请求参数
     *
     * @param url 请求地址
     * @param params 请求参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doGet(String url, Map<String, String> params) throws Exception {
        return doGet(url, null, params);
    }

    /**
     * 发送get请求；带请求头和请求参数
     *
     * @param url 请求地址
     * @param headers 请求头集合
     * @param params 请求参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doGet(String url, Map<String, String> headers, Map<String, String> params) throws Exception {
        // 创建httpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        // 创建访问的地址
        URIBuilder uriBuilder = new URIBuilder(url);
        if (params != null) {
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                uriBuilder.setParameter(entry.getKey(), entry.getValue());
            }
        }

        // 创建http对象
        HttpGet httpGet = new HttpGet(uriBuilder.build());
        /**
         * setConnectTimeout：设置连接超时时间，单位毫秒。
         * setConnectionRequestTimeout：设置从connect Manager(连接池)获取Connection
         * 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。
         * setSocketTimeout：请求获取数据的超时时间(即响应时间)，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
         */
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpGet.setConfig(requestConfig);

        // 设置请求头
        packageHeader(headers, httpGet);

        // 创建httpResponse对象
        CloseableHttpResponse httpResponse = null;

        try {
            // 执行请求并获得响应结果
            return getHttpClientResult(httpResponse, httpClient, httpGet);
        } finally {
            // 释放资源
            release(httpResponse, httpClient);
        }
    }

    /**
     * 发送post请求；不带请求头和请求参数
     *
     * @param url 请求地址
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPost(String url) throws Exception {
        return doPost(url, null, null);
    }

    /**
     * 发送post请求；带请求参数
     *
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPost(String url, Map<String, String> params) throws Exception {
        return doPost(url, null, params);
    }

    /**
     * 发送post请求；带请求头和请求参数
     *
     * @param url 请求地址
     * @param headers 请求头集合
     * @param params 请求参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPost(String url, Map<String, String> headers, Map<String, String> params) throws Exception {
        // 创建httpClient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        // 创建http对象
        HttpPost httpPost = new HttpPost(url);
        /**
         * setConnectTimeout：设置连接超时时间，单位毫秒。
         * setConnectionRequestTimeout：设置从connect Manager(连接池)获取Connection
         * 超时时间，单位毫秒。这个属性是新加的属性，因为目前版本是可以共享连接池的。
         * setSocketTimeout：请求获取数据的超时时间(即响应时间)，单位毫秒。 如果访问一个接口，多少时间内无法返回数据，就直接放弃此次调用。
         */
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpPost.setConfig(requestConfig);
        // 设置请求头
		/*httpPost.setHeader("Cookie", "");
		httpPost.setHeader("Connection", "keep-alive");
		httpPost.setHeader("Accept", "application/json");
		httpPost.setHeader("Accept-Language", "zh-CN,zh;q=0.9");
		httpPost.setHeader("Accept-Encoding", "gzip, deflate, br");
		httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36");*/
        packageHeader(headers, httpPost);

        // 封装请求参数
        packageParam(params, httpPost);

        // 创建httpResponse对象
        CloseableHttpResponse httpResponse = null;

        try {
            // 执行请求并获得响应结果
            return getHttpClientResult(httpResponse, httpClient, httpPost);
        } finally {
            // 释放资源
            release(httpResponse, httpClient);
        }
    }

    /**
     * 发送put请求；不带请求参数
     *
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPut(String url) throws Exception {
        return doPut(url);
    }

    /**
     * 发送put请求；带请求参数
     *
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doPut(String url, Map<String, String> params) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPut httpPut = new HttpPut(url);
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpPut.setConfig(requestConfig);

        packageParam(params, httpPut);

        CloseableHttpResponse httpResponse = null;

        try {
            return getHttpClientResult(httpResponse, httpClient, httpPut);
        } finally {
            release(httpResponse, httpClient);
        }
    }

    /**
     * 发送delete请求；不带请求参数
     *
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doDelete(String url) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpDelete httpDelete = new HttpDelete(url);
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(CONNECT_TIMEOUT).setSocketTimeout(SOCKET_TIMEOUT).build();
        httpDelete.setConfig(requestConfig);

        CloseableHttpResponse httpResponse = null;
        try {
            return getHttpClientResult(httpResponse, httpClient, httpDelete);
        } finally {
            release(httpResponse, httpClient);
        }
    }

    /**
     * 发送delete请求；带请求参数
     *
     * @param url 请求地址
     * @param params 参数集合
     * @return
     * @throws Exception
     */
    public static HttpClientResult doDelete(String url, Map<String, String> params) throws Exception {
        if (params == null) {
            params = new HashMap<String, String>();
        }

        params.put("_method", "delete");
        return doPost(url, params);
    }

    /**
     * Description: 封装请求头
     * @param params
     * @param httpMethod
     */
    public static void packageHeader(Map<String, String> params, HttpRequestBase httpMethod) {
        // 封装请求头
        if (params != null) {
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                // 设置到请求头到HttpRequestBase对象中
                httpMethod.setHeader(entry.getKey(), entry.getValue());
            }
        }
    }

    /**
     * Description: 封装请求参数
     *
     * @param params
     * @param httpMethod
     * @throws UnsupportedEncodingException
     */
    public static void packageParam(Map<String, String> params, HttpEntityEnclosingRequestBase httpMethod)
            throws UnsupportedEncodingException {
        // 封装请求参数
        if (params != null) {
            List<NameValuePair> nvps = new ArrayList<NameValuePair>();
            Set<Map.Entry<String, String>> entrySet = params.entrySet();
            for (Map.Entry<String, String> entry : entrySet) {
                nvps.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
            }

            // 设置到请求的http对象中
            httpMethod.setEntity(new UrlEncodedFormEntity(nvps, ENCODING));
        }
    }

    /**
     * Description: 获得响应结果
     *
     * @param httpResponse
     * @param httpClient
     * @param httpMethod
     * @return
     * @throws Exception
     */
    public static HttpClientResult getHttpClientResult(CloseableHttpResponse httpResponse,
                                                       CloseableHttpClient httpClient, HttpRequestBase httpMethod) throws Exception {
        // 执行请求
        httpResponse = httpClient.execute(httpMethod);

        // 获取返回结果
        if (httpResponse != null && httpResponse.getStatusLine() != null) {
            String content = "";
            if (httpResponse.getEntity() != null) {
                content = EntityUtils.toString(httpResponse.getEntity(), ENCODING);
            }
            return new HttpClientResult(httpResponse.getStatusLine().getStatusCode(), content);
        }
        return new HttpClientResult(HttpStatus.SC_INTERNAL_SERVER_ERROR);
    }

    /**
     * Description: 释放资源
     *
     * @param httpResponse
     * @param httpClient
     * @throws IOException
     */
    public static void release(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) throws IOException {
        // 释放资源
        if (httpResponse != null) {
            httpResponse.close();
        }
        if (httpClient != null) {
            httpClient.close();
        }
    }

}