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因为经常用到 便写出来方边使用 直接复制本类即可

import java.io.*;import java.net.HttpURLConnection;import java.net.URL;import java.nio.charset.Charset;import java.util.HashMap;import java.util.Map;/** * 封装HttpURLConnection开箱即用 * Create by yster@foxmail.com 2018/9/10/010 19:17*/public class HttpUtil {private HttpURLConnection connection;private Charset charset = Charset.forName("UTF-8");private int readTimeout = 32000;private int connectTimeout = 10000;private String method = "GET";private boolean doInput = true;private Map<String, String> headers = null;private String data = null;/**     * 实例化对象*/    public static HttpUtil connect(String url) throws IOException {return new HttpUtil((HttpURLConnection) new URL(url).openConnection());    }/**     * 禁止new实例*/    private HttpUtil() {    }private HttpUtil(HttpURLConnection connection) {this.connection = connection;    }/**     * 设置读去超时时间/ms     *     * @param timeout*/    public HttpUtil setReadTimeout(int timeout) {this.readTimeout = timeout;return this;    }/**     * 设置链接超时时间/ms     *     * @param timeout*/    public HttpUtil setConnectTimeout(int timeout) {this.connectTimeout = timeout;return this;    }/**     * 设置请求方式     *     * @param method*/    public HttpUtil setMethod(String method) {this.method = method;return this;    }/**     * 添加Headers     *     * @param map*/    public HttpUtil setHeaders(Map<String, String> map) {        String cookie = "Cookie";if (map.containsKey(cookie)) {            headers = new HashMap<>();            headers.put(cookie, map.get(cookie));        }return this;    }/**     * 是否接受输入流     * 默认true     *     * @param is*/    public HttpUtil setDoInput(boolean is) {this.doInput = is;return this;    }/**     * 设置请求响应的编码*/    public HttpUtil setCharset(String charset) {this.charset = Charset.forName(charset);return this;    }/**     * 写入数据,接受Map&lt;String,String&gt;或String类型&lt;br&gt;     * 例如POST时的参数&lt;br&gt;     * demo=1&amp;name=2*/    public HttpUtil setData(Object object) {if (object == null) {return this;        } else if (object instanceof String) {this.data = (String) object;        } else if (object instanceof Map) {            Map map = (Map) object;            StringBuilder builder = new StringBuilder();for (Object key : map.keySet()) {                builder.append(key + "=" + map.get(key) + "&");            }this.data = builder.toString().substring(0, builder.length() > 0 ? builder.length() - 1 : builder.length());        }return this;    }/**     * 发起请求*/    public HttpUtil execute() throws IOException {//添加请求头        if (headers != null) {for (String key : headers.keySet()) {                connection.setRequestProperty(key, headers.get(key));            }        }//设置读去超时时间为10秒        connection.setReadTimeout(readTimeout);//设置链接超时为10秒        connection.setConnectTimeout(connectTimeout);//设置请求方式,GET,POST        connection.setRequestMethod(method.toUpperCase());//接受输入流        connection.setDoInput(doInput);//写入参数        if (data != null && !method.equalsIgnoreCase("GET")) {//启动输出流，当需要传递参数时需要开启            connection.setDoOutput(true);//添加请求参数，注意：如果是GET请求，参数要写在URL中            OutputStream output = connection.getOutputStream();            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(output, charset));//写入参数 用&amp;分割。            writer.write(data);            writer.flush();            writer.close();        }//发起请求        connection.connect();return this;    }/**     * 获取HttpURLConnection*/    public HttpURLConnection getConnection() {return this.connection;    }/**     * 获取响应字符串*/    public String getBody(String... charsets) {//设置编码        String charset = "UTF-8";if (charsets.length > 0) {            charset = charsets[0];        }//读取输入流        try {            InputStream inputStream = connection.getInputStream();            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, charset));            String line = bufferedReader.readLine();            StringBuilder builder = new StringBuilder();while (line != null) {                builder.append(line);                line = bufferedReader.readLine();            }return builder.toString();        } catch (IOException e) {            e.printStackTrace();        }//失败返回NULL        return null;    }public static void main(String[] args) throws IOException {        String body = HttpUtil.connect("http://www.baidu.com")                .setMethod("GET")                .setCharset("UTF-8")                .execute()                .getBody();        System.out.println(body);    }}

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【本文版权归微信公众号"代码艺术"（ID：onblog）所有，若是转载请务必保留本段原创声明，违者必究。若是文章有不足之处，欢迎关注微信公众号私信与我进行交流！】