package com.doumee.core.utils;
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import com.alibaba.fastjson.JSON;
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import com.alibaba.fastjson.JSONObject;
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import lombok.AllArgsConstructor;
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import lombok.Getter;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.http.HttpMethod;
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import java.io.*;
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import java.net.HttpURLConnection;
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import java.net.URL;
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import java.util.Map;
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import java.util.zip.GZIPInputStream;
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/**
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* Http工具类
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* @author Eva.Caesar Liu
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* @date 2022/03/15 09:54
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*/
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@Slf4j
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public class Http {
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/**
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* 获取Http连接
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* @param url 请求地址
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*
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* @return HttpWrap
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*/
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public HttpWrap build(String url) throws IOException {
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return this.build(url, "UTF-8");
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}
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/**
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* 获取Http连接
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* @param url 请求地址
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* @param charset 编码，默认UTF-8
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*
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* @return HttpWrap
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*/
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public HttpWrap build(String url, String charset) throws IOException {
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if (url == null) {
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throw new NullPointerException("url can not be null");
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}
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URL urlObj = new URL(url);
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HttpURLConnection httpURLConnection = (HttpURLConnection) urlObj.openConnection();
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httpURLConnection.setRequestProperty("ContentType", charset);
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return new HttpWrap(url, charset, httpURLConnection);
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}
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@Getter
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public static class HttpWrap {
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private String url;
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private String charset;
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private HttpURLConnection connection;
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private boolean gzip;
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public HttpWrap (String url, String charset, HttpURLConnection connection) {
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this.url = url;
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this.charset = charset;
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this.connection = connection;
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}
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/**
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* 开启GZIP压缩
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*/
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public HttpWrap gzip () {
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this.gzip = Boolean.TRUE;
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return this;
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}
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/**
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* 设置请求属性
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* @param key 属性
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* @param value 属性值
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*
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* @return HttpWrap
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*/
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public HttpWrap setRequestProperty (String key, String value) {
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connection.setRequestProperty(key, value);
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return this;
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}
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/**
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* 设置连接超时时间
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* @param timeout 连接超时时间
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*
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* @return HttpWrap
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*/
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public HttpWrap setConnectTimeout (int timeout) {
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connection.setConnectTimeout(timeout);
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return this;
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}
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/**
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* 设置读取超时时间
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* @param timeout 读取超时时间
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*
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* @return HttpWrap
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*/
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public HttpWrap setReadTimeout (int timeout) {
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connection.setReadTimeout(timeout);
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return this;
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}
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/**
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* 发送GET请求
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*
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* @return HttpResult
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*/
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public HttpResult get () throws IOException {
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log.trace("Eva::Util::Http send http request by method GET, url=" + url);
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connection.setRequestMethod(HttpMethod.GET.toString());
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return new HttpResult(connection.getInputStream(), charset, gzip);
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}
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/**
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* 发送POST请求
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*
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* @return HttpResult
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*/
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public HttpResult post () throws IOException {
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log.trace("Eva::Util::Http send http request by method POST, url=" + url);
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connection.setRequestMethod(HttpMethod.POST.toString());
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return new HttpResult(connection.getInputStream(), charset, gzip);
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}
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/**
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* 发送POST请求
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* @param params 请求参数
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*
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* @return HttpResult
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*/
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public HttpResult post (String params) throws IOException {
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log.trace("Eva::Util::Http send http request by method POST, url=" + url);
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OutputStreamWriter streamWriter = null;
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try {
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connection.setRequestMethod(HttpMethod.POST.toString());
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if (params != null || "".equals(params.trim())) {
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connection.setDoInput(Boolean.TRUE);
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connection.setDoOutput(Boolean.TRUE);
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streamWriter = new OutputStreamWriter(connection.getOutputStream(), charset);
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streamWriter.write(params);
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streamWriter.flush();
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}
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return new HttpResult(connection.getInputStream(), charset, gzip);
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} finally {
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if (streamWriter != null) {
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streamWriter.close();
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}
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}
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}
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/**
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* 发送POST请求，请求参数类型为JSON
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* @param paramsMap 请求参数
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*
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* @return HttpResult
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*/
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public HttpResult postJSON(Map<String, Object> paramsMap) throws IOException {
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setRequestProperty("Content-Type", "application/json");
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if (paramsMap == null || paramsMap.size() == 0) {
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return post();
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}
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return post(JSON.toJSONString(paramsMap));
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}
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/**
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* 发送POST请求，请求参数类型为JSON
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* @param paramJSONObject 请求参数
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*
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* @return HttpResult
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*/
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public HttpResult postJSON(JSONObject paramJSONObject) throws IOException {
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setRequestProperty("Content-Type", "application/json");
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if (paramJSONObject == null || paramJSONObject.size() == 0) {
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return post();
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}
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return post(paramJSONObject.toJSONString());
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}
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}
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@Getter
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@AllArgsConstructor
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public static class HttpResult {
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private InputStream inputStream;
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private String charset;
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private boolean gzip;
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/**
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* 转为字符串
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*/
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public String toStringResult () throws IOException{
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BufferedReader reader = null;
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InputStream is = inputStream;
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try {
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if (gzip) {
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is = new GZIPInputStream(inputStream);
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}
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reader = new BufferedReader(new InputStreamReader(is, charset));
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StringBuilder result = new StringBuilder();
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String line;
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while((line = reader.readLine()) != null) {
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result.append(line);
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}
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return result.toString();
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} finally {
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if (reader != null) {
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reader.close();
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}
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if (is != null) {
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is.close();
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}
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}
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}
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/**
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* 转为JSONObject对象
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*/
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public JSONObject toJSONObject () throws IOException {
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return JSONObject.parseObject(toStringResult());
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}
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/**
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* 转为目标Class对象
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*/
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public <T> T toClass (Class<T> clazz) throws IOException {
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return JSONObject.parseObject(toStringResult(), clazz);
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}
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}
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}
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