发送http请求的工具类 HttpUtil

这个应该是最实用的工具类之一了

这个HttpUtil工具类写的还是比较全面的, 日常使用中的使用场景都涵盖了
文件上传, json上传,  xml上传, form上传等, 使用方便性能大为提高

包含:

• 发送GET请求
• 发送GET请求 包含map参数
• 发送GET请求  包含"map参数"和"请求属性"
• 发送POST请求
• 发送POST请求 包含map参数
• 发送POST请求 包含"map参数"和"请求属性"
• 发送请求, 得到响应对象 HttpRespons
• 直接通过HTTP协议提交数据到服务器,实现面表单提交功能,  包含文件上传
  
• 发送xml数据
• 发送 Json数据
  
• 
  

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.Vector;

import org.apache.http.HttpStatus;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.mogujie.iip.commons.pojo.FormFile;
import org.mogujie.iip.commons.pojo.HttpRespons;

import com.alibaba.fastjson.JSON;

/**
 * Created by fengzhen on 16/6/27.
 */
public class HttpUtil {

    private String defaultContentEncoding;

    public HttpUtil() {
        this.defaultContentEncoding = Charset.defaultCharset().name();
    }

    /**
     * 发送GET请求
     *
     * @param urlString  URL地址
     * @return 响应对象
     * @throws IOException
     */
    public HttpRespons sendGet(String urlString) throws IOException {
        return this.send(urlString, "GET", null, null);
    }

    /**
     * 发送GET请求
     *
     * @param urlString  URL地址
     * @param params 参数集合
     * @return 响应对象
     * @throws IOException
     */
    public HttpRespons sendGet(String urlString, Map<String, String> params) throws IOException {
        return this.send(urlString, "GET", params, null);
    }

    /**
     * 发送GET请求
     *
     * @param urlString URL地址
     * @param params 参数集合
     * @param propertys 请求属性
     * @return 响应对象
     * @throws IOException
     */
    public HttpRespons sendGet(String urlString, Map<String, String> params, Map<String, String> propertys)
            throws IOException {
        return this.send(urlString, "GET", params, propertys);
    }

    /**
     * 发送POST请求
     *
     * @param urlString URL地址
     * @return 响应对象
     * @throws IOException
     */
    public HttpRespons sendPost(String urlString) throws IOException {
        return this.send(urlString, "POST", null, null);
    }

    /**
     * 发送POST请求
     *
     * @param urlString URL地址
     * @param params 参数集合
     * @return 响应对象
     * @throws IOException
     */
    public HttpRespons sendPost(String urlString, Map<String, String> params) throws IOException {
        return this.send(urlString, "POST", params, null);
    }

    /**
     * 发送POST请求
     *
     * @param urlString URL地址
     * @param params 参数集合
     * @param propertys 请求属性
     * @return 响应对象
     * @throws IOException
     */
    public HttpRespons sendPost(String urlString, Map<String, String> params, Map<String, String> propertys)
            throws IOException {
        return this.send(urlString, "POST", params, propertys);
    }

    /**
     * 发送HTTP请求
     *
     * @param urlString 地址
     * @param method  get/post
     * @param parameters  添加由键值对指定的请求参数
     * @param propertys  添加由键值对指定的一般请求属性
     * @return 响映对象
     * @throws IOException
     */
    private HttpRespons send(String urlString, String method, Map<String, String> parameters,
                             Map<String, String> propertys) throws IOException {
        HttpURLConnection urlConnection = null;

        if (method.equalsIgnoreCase("GET") && parameters != null) {
            StringBuffer param = new StringBuffer();
            int i = 0;
            for (String key : parameters.keySet()) {
                if (i == 0)
                    param.append("?");
                else
                    param.append("&");
                param.append(key).append("=").append(parameters.get(key));
                i++;
            }
            urlString += param;
        }

        URL url = new URL(urlString);
        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod(method);
        urlConnection.setDoOutput(true);
        urlConnection.setDoInput(true);
        urlConnection.setUseCaches(false);

        if (propertys != null)
            for (String key : propertys.keySet()) {
                urlConnection.addRequestProperty(key, propertys.get(key));
            }

        if (method.equalsIgnoreCase("POST") && parameters != null) {
            StringBuffer param = new StringBuffer();
            for (String key : parameters.keySet()) {
                param.append("&");
                param.append(key).append("=").append(parameters.get(key));
            }
            urlConnection.getOutputStream().write(param.toString().getBytes());
            urlConnection.getOutputStream().flush();
            urlConnection.getOutputStream().close();
        }
        return makeContent(urlString, urlConnection);
    }

    private static HttpRespons makeContent(String urlString, HttpURLConnection urlConnection) throws IOException {
        return makeContent(urlString, urlConnection, null);
    }

    /**
     * 得到响应对象
     *
     * @param urlConnection
     * @return 响应对象
     * @throws IOException
     */
    private static HttpRespons makeContent(String urlString, HttpURLConnection urlConnection, String ecod) throws IOException {
        HttpRespons httpResponser = new HttpRespons();
        try {
            InputStream in = urlConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
            List<String> contentCollection = new Vector<String>();
            StringBuffer temp = new StringBuffer();
            String line = bufferedReader.readLine();
            while (line != null) {
                contentCollection.add(line);
                temp.append(line).append("\r\n");
                line = bufferedReader.readLine();
            }
            bufferedReader.close();
            if(StringUtil.isEmpty(ecod)) {
                ecod = urlConnection.getContentEncoding();
                if (ecod == null)
                    ecod = "UTF-8";
            }
            httpResponser.setUrlString(urlString);
            httpResponser.setDefaultPort(urlConnection.getURL().getDefaultPort());
            httpResponser.setFile(urlConnection.getURL().getFile());
            httpResponser.setHost(urlConnection.getURL().getHost());
            httpResponser.setPath(urlConnection.getURL().getPath());
            httpResponser.setPort(urlConnection.getURL().getPort());
            httpResponser.setProtocol(urlConnection.getURL().getProtocol());
            httpResponser.setQuery(urlConnection.getURL().getQuery());
            httpResponser.setRef(urlConnection.getURL().getRef());
            httpResponser.setUserInfo(urlConnection.getURL().getUserInfo());
            httpResponser.setContent(new String(temp.toString().getBytes(), ecod));
            httpResponser.setContentEncoding(ecod);
            httpResponser.setCode(urlConnection.getResponseCode());
            httpResponser.setMessage(urlConnection.getResponseMessage());
            httpResponser.setContentType(urlConnection.getContentType());
            httpResponser.setMethod(urlConnection.getRequestMethod());
            httpResponser.setConnectTimeout(urlConnection.getConnectTimeout());
            httpResponser.setReadTimeout(urlConnection.getReadTimeout());
            return httpResponser;
        } catch (IOException e) {
            throw e;
        } finally {
            if (urlConnection != null)
                urlConnection.disconnect();
        }
    }

    /**
     * 默认的响应字符集
     */
    public String getDefaultContentEncoding() {
        return this.defaultContentEncoding;
    }


    /**
     * 发送GET请求
     * @param url
     * @param params
     * @param headers
     * @return
     * @throws Exception
     */
    public static URLConnection sendGetRequest(String url,
                                               Map<String, String> params, Map<String, String> headers)
            throws Exception {
        StringBuilder buf = new StringBuilder(url);
        Set<Entry<String, String>> entrys = null;
        // 如果是GET请求，则请求参数在URL中
        if (params != null && !params.isEmpty()) {
            buf.append("?");
            entrys = params.entrySet();
            for (Map.Entry<String, String> entry : entrys) {
                buf.append(entry.getKey()).append("=")
                        .append(URLEncoder.encode(entry.getValue(), "UTF-8"))
                        .append("&");
            }
            buf.deleteCharAt(buf.length() - 1);
        }
        URL url1 = new URL(buf.toString());
        HttpURLConnection conn = (HttpURLConnection) url1.openConnection();
        conn.setRequestMethod("GET");
        // 设置请求头
        if (headers != null && !headers.isEmpty()) {
            entrys = headers.entrySet();
            for (Map.Entry<String, String> entry : entrys) {
                conn.setRequestProperty(entry.getKey(), entry.getValue());
            }
        }
        conn.getResponseCode();
        return conn;
    }
    /**
     * 发送POST请求
     * @param url
     * @param params
     * @param headers
     * @return
     * @throws Exception
     */
    public static URLConnection sendPostRequest(String url,
                                                Map<String, String> params, Map<String, String> headers)
            throws Exception {
        StringBuilder buf = new StringBuilder();
        Set<Entry<String, String>> entrys = null;
        // 如果存在参数，则放在HTTP请求体，形如name=aaa&age=10
        if (params != null && !params.isEmpty()) {
            entrys = params.entrySet();
            for (Map.Entry<String, String> entry : entrys) {
                buf.append(entry.getKey()).append("=")
                        .append(URLEncoder.encode(entry.getValue(), "UTF-8"))
                        .append("&");
            }
            buf.deleteCharAt(buf.length() - 1);
        }
        URL url1 = new URL(url);
        HttpURLConnection conn = (HttpURLConnection) url1.openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        OutputStream out = conn.getOutputStream();
        out.write(buf.toString().getBytes("UTF-8"));
        if (headers != null && !headers.isEmpty()) {
            entrys = headers.entrySet();
            for (Map.Entry<String, String> entry : entrys) {
                conn.setRequestProperty(entry.getKey(), entry.getValue());
            }
        }
        conn.getResponseCode(); // 为了发送成功
        return conn;
    }
    /**
     * 直接通过HTTP协议提交数据到服务器,实现如下面表单提交功能:
     *





     * @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用或这样的路径测试)
     * @param params 请求参数 key为参数名,value为参数值
     * @param files 上传文件
     */
    public static boolean uploadFiles(String path, Map<String, String> params, FormFile[] files) throws Exception{
        final String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线
        final String endline = "--" + BOUNDARY + "--\r\n";//数据结束标志

        int fileDataLength = 0;
        if(files!=null&&files.length!=0){
            for(FormFile uploadFile : files){//得到文件类型数据的总长度
                StringBuilder fileExplain = new StringBuilder();
                fileExplain.append("--");
                fileExplain.append(BOUNDARY);
                fileExplain.append("\r\n");
                fileExplain.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");
                fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");
                fileExplain.append("\r\n");
                fileDataLength += fileExplain.length();
                if(uploadFile.getInStream()!=null){
                    fileDataLength += uploadFile.getFile().length();
                }else{
                    fileDataLength += uploadFile.getData().length;
                }
            }
        }
        StringBuilder textEntity = new StringBuilder();
        if(params!=null&&!params.isEmpty()){
            for (Map.Entry<String, String> entry : params.entrySet()) {//构造文本类型参数的实体数据
                textEntity.append("--");
                textEntity.append(BOUNDARY);
                textEntity.append("\r\n");
                textEntity.append("Content-Disposition: form-data; name=\""+ entry.getKey() + "\"\r\n\r\n");
                textEntity.append(entry.getValue());
                textEntity.append("\r\n");
            }
        }
        //计算传输给服务器的实体数据总长度
        int dataLength = textEntity.toString().getBytes().length + fileDataLength + endline.getBytes().length;

        URL url = new URL(path);
        int port = url.getPort()==-1 ? 80 : url.getPort();
        Socket socket = new Socket(InetAddress.getByName(url.getHost()), port);
        OutputStream outStream = socket.getOutputStream();
        //下面完成HTTP请求头的发送
        String requestmethod = "POST "+ url.getPath()+" HTTP/1.1\r\n";
        outStream.write(requestmethod.getBytes());
        String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n";
        outStream.write(accept.getBytes());
        String language = "Accept-Language: zh-CN\r\n";
        outStream.write(language.getBytes());
        String contenttype = "Content-Type: multipart/form-data; boundary="+ BOUNDARY+ "\r\n";
        outStream.write(contenttype.getBytes());
        String contentlength = "Content-Length: "+ dataLength + "\r\n";
        outStream.write(contentlength.getBytes());
        String alive = "Connection: Keep-Alive\r\n";
        outStream.write(alive.getBytes());
        String host = "Host: "+ url.getHost() +":"+ port +"\r\n";
        outStream.write(host.getBytes());
        //写完HTTP请求头后根据HTTP协议再写一个回车换行
        outStream.write("\r\n".getBytes());
        //把所有文本类型的实体数据发送出来
        outStream.write(textEntity.toString().getBytes());
        //把所有文件类型的实体数据发送出来
        if(files!=null&&files.length!=0){
            for(FormFile uploadFile : files){
                StringBuilder fileEntity = new StringBuilder();
                fileEntity.append("--");
                fileEntity.append(BOUNDARY);
                fileEntity.append("\r\n");
                fileEntity.append("Content-Disposition: form-data;name=\""+ uploadFile.getParameterName()+"\";filename=\""+ uploadFile.getFilname() + "\"\r\n");
                fileEntity.append("Content-Type: "+ uploadFile.getContentType()+"\r\n\r\n");
                outStream.write(fileEntity.toString().getBytes());
                if(uploadFile.getInStream()!=null){
                    byte[] buffer = new byte[1024];
                    int len = 0;
                    while((len = uploadFile.getInStream().read(buffer, 0, 1024))!=-1){
                        outStream.write(buffer, 0, len);
                    }
                    uploadFile.getInStream().close();
                }else{
                    outStream.write(uploadFile.getData(), 0, uploadFile.getData().length);
                }
                outStream.write("\r\n".getBytes());
            }
        }
        //下面发送数据结束标志，表示数据已经结束
        outStream.write(endline.getBytes());
        BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

        if(reader.readLine().indexOf("200")==-1){//读取web服务器返回的数据，判断请求码是否为200，如果不是200，代表请求失败
            outStream.flush();
            outStream.close();
            reader.close();
            socket.close();
            return false;
        }
        outStream.flush();
        outStream.close();
        reader.close();
        socket.close();
        return true;
    }
    /**
     * 提交数据到服务器
     * @param path 上传路径(注：避免使用localhost或127.0.0.1这样的路径测试，因为它会指向手机模拟器，你可以使用或这样的路径测试)
     * @param params 请求参数 key为参数名,value为参数值
     * @param file 上传文件
     */
    public static boolean uploadFile(String path, Map<String, String> params, FormFile file) throws Exception{
        return uploadFiles(path, params, new FormFile[]{file});
    }
    /**
     * 将输入流转为字节数组
     * @param inStream
     * @return
     * @throws Exception
     */
    public static byte[] read2Byte(InputStream inStream)throws Exception{
        ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while( (len = inStream.read(buffer)) !=-1 ){
            outSteam.write(buffer, 0, len);
        }
        outSteam.close();
        inStream.close();
        return outSteam.toByteArray();
    }
    /**
     * 将输入流转为字符串
     * @param inStream
     * @return
     * @throws Exception
     */
    public static String read2String(InputStream inStream)throws Exception{
        ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while( (len = inStream.read(buffer)) !=-1 ){
            outSteam.write(buffer, 0, len);
        }
        outSteam.close();
        inStream.close();
        return new String(outSteam.toByteArray(),"UTF-8");
    }
    /**
     * 发送xml数据
     * @param path 请求地址
     * @param xml xml数据
     * @param encoding 编码
     * @return
     * @throws Exception
     */
    public static byte[] postXml(String path, String xml, String encoding) throws Exception{
        byte[] data = xml.getBytes(encoding);
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        conn.setRequestProperty("Content-Type", "text/xml; charset="+ encoding);
        conn.setRequestProperty("Content-Length", String.valueOf(data.length));
        conn.setConnectTimeout(5 * 1000);
        OutputStream outStream = conn.getOutputStream();
        outStream.write(data);
        outStream.flush();
        outStream.close();
        if(conn.getResponseCode()==200){
            return read2Byte(conn.getInputStream());
        }
        return null;
    }

    /**
     * 设置默认的响应字符集
     */
    public void setDefaultContentEncoding(String defaultContentEncoding) {
        this.defaultContentEncoding = defaultContentEncoding;
    }

    /**
     * 发送post请求
     * @param url 地址
     * @param params 参数
     * @return 请求资源返回的值
     */
    public static String postForm(String url, Map<String, Object> params, int... timeout) {
        String charset = "UTF-8";

        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpPost httpPost = new HttpPost(url);
        int cTimeout = 3000;
        // 设置请求和传输超时时间
        if (timeout != null && timeout.length > 0) {
            cTimeout = timeout[0];
        }
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(cTimeout)
                .setConnectTimeout(cTimeout).build();
        httpPost.setConfig(requestConfig);

        CloseableHttpResponse httpResponse = null;
        try {
            if (params != null && params.isEmpty() == false) {

                MultipartEntityBuilder builder = MultipartEntityBuilder.create();
                //builder.setCharset(Charset.forName(charset));

                if (params != null && !params.isEmpty()) {
                    for (Map.Entry<String, Object> entry : params.entrySet()) {//构造文本类型参数的实体数据
                        builder.addTextBody(entry.getKey(), entry.getValue().toString());//增加文本内容
                    }
                }

                httpPost.setEntity(builder.build());
            }

            httpResponse = httpClient.execute(httpPost);
            if (httpResponse.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
                System.out.println(url + ": " + httpResponse.getStatusLine().getStatusCode());
            }
            return EntityUtils.toString(httpResponse.getEntity(), charset);
        } catch (Exception ex) {
            System.out.println(url);
            System.out.println(JSON.toJSONString(params));
            ex.printStackTrace();
            return null;
        } finally {
            try {
                if (httpResponse != null) {
                    httpResponse.close();
                }
                httpClient.close();
            } catch (Exception ex) {
                System.out.println(url + ": " + ex.getMessage());
            }
        }
    }

    /**
     * post Json
     * @param strURL
     * @param params
     * @return
     */
    public static String postJSON(String strURL, Map<String, Object> params) {

        String paramsStr = JSON.toJSONString(params);

        try {
            URL url = new URL(strURL);// 创建连接
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setUseCaches(false);
            connection.setInstanceFollowRedirects(true);
            connection.setRequestMethod("POST"); // 设置请求方式
            connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式
            connection.setRequestProperty("Content-Type", "application/json"); // 设置发送数据的格式
            connection.connect();
            OutputStreamWriter out = new OutputStreamWriter(
                    connection.getOutputStream(), "UTF-8"); // utf-8编码
            out.append(paramsStr);
            out.flush();
            out.close();
            // 读取响应
            int length = (int) connection.getContentLength();// 获取长度
            InputStream is = connection.getInputStream();
            if (length != -1) {
                byte[] data = new byte[length];
                byte[] temp = new byte[512];
                int readLen = 0;
                int destPos = 0;
                while ((readLen = is.read(temp)) > 0) {
                    System.arraycopy(temp, 0, data, destPos, readLen);
                    destPos += readLen;
                }
                String result = new String(data, "UTF-8"); // utf-8编码
                System.out.println(result);
                return result;
            }
        } catch (IOException e) {
            System.out.println(strURL);
            System.out.println(paramsStr);
            e.printStackTrace();
        }
        return "error"; // 自定义错误信息
    }

    public static String postUrl(String urlStr, Map<String, Object> params) {
        return postUrl(urlStr, params, null);
    }

    /**
     * post Url
     * @param urlStr
     * @param params
     * @return
     */
    public static String postUrl(String urlStr, Map<String, Object> params, String encode) {

        try {

            URL url = new URL(urlStr);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("POST");
            urlConnection.setDoOutput(true);
            urlConnection.setDoInput(true);
            urlConnection.setUseCaches(false);

            if (params != null) {

                StringBuffer param = new StringBuffer();

                for (String key : params.keySet()) {
                    if(params.get(key) instanceof List){
                        @SuppressWarnings("unchecked")
                        List<Object> list = (List<Object>) params.get(key);
                        for (Object str : list){
                            param.append("&");
                            param.append(key).append("=").append(str);
                        }
                    } else {
                        param.append("&");
                        param.append(key).append("=").append(params.get(key));
                    }
                }

                urlConnection.getOutputStream().write(param.toString().getBytes());
                urlConnection.getOutputStream().flush();
                urlConnection.getOutputStream().close();
            }

            HttpRespons respons = makeContent(urlStr, urlConnection, encode);

            if (respons.getCode() != 200) {
                System.out.println(urlStr);
                System.out.println(JSON.toJSONString(params));
                System.out.println(respons.getContent());
            }

            return respons.getContent();

        } catch (Exception ex) {
            System.out.println(urlStr);
            System.out.println(JSON.toJSONString(params));
            ex.printStackTrace();
            return null;
        }
    }
}