HttpUtil的get和post请求

Http工具类 

import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
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.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;/*** http 工具类*/
public class HttpUtil {private static String contentType = "application/json";private static String encoding = "UTF-8";/*** post请求* @param url* @param params* @return*/public static String post(String url, String params){try {return postGeneralUrl(url, params);} catch (Exception e) {e.printStackTrace();}return "请求失败";}public static String postGeneralUrl(String generalUrl, String params)throws Exception {URL url = new URL(generalUrl);// 打开和URL之间的连接HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("POST");// 设置通用的请求属性connection.setRequestProperty("Content-Type", contentType);connection.setRequestProperty("Connection", "Keep-Alive");connection.setUseCaches(false);connection.setDoOutput(true);connection.setConnectTimeout(2000);connection.setDoInput(true);// 得到请求的输出流对象DataOutputStream out = new DataOutputStream(connection.getOutputStream());out.write(params.getBytes(encoding));out.flush();out.close();// 建立实际的连接connection.connect();// 获取所有响应头字段Map<String, List<String>> headers = connection.getHeaderFields();// 遍历所有的响应头字段for (String key : headers.keySet()) {System.err.println(key + "--->" + headers.get(key));}// 定义 BufferedReader输入流来读取URL的响应BufferedReader in = null;in = new BufferedReader(new InputStreamReader(connection.getInputStream(), encoding));String result = "";String getLine;while ((getLine = in.readLine()) != null) {result += getLine;}in.close();System.err.println("result:" + result);return result;}public static String uploadFile(String url, File file, Map<String, Object> map) {CloseableHttpClient httpClient = HttpClients.createDefault();String result = "";//每个post参数之间的分隔。随意设定，只要不会和其他的字符串重复即可。String boundary ="--------------4585696313564699";try {//文件名String fileName = file.getName();HttpPost httpPost = new HttpPost(url);//设置请求头httpPost.setHeader("Content-Type","multipart/form-data; boundary="+boundary);//HttpEntity builderMultipartEntityBuilder builder = MultipartEntityBuilder.create();//字符编码builder.setCharset(Charset.forName("UTF-8"));//模拟浏览器builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);//boundarybuilder.setBoundary(boundary);//multipart/form-databuilder.addPart("file",new FileBody(file));builder.addTextBody("needVerify",map.get("needVerify").toString());builder.addTextBody("businessTimestamp",map.get("businessTimestamp").toString());builder.addTextBody("nonce",map.get("nonce").toString());builder.addTextBody("businessSign",map.get("businessSign").toString());//HttpEntityHttpEntity entity = builder.build();httpPost.setEntity(entity);// 执行提交HttpResponse response = httpClient.execute(httpPost);//响应HttpEntity responseEntity = response.getEntity();if (responseEntity != null) {// 将响应内容转换为字符串result = EntityUtils.toString(responseEntity, Charset.forName("UTF-8"));}} catch (IOException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();} finally {try {httpClient.close();} catch (IOException e) {e.printStackTrace();}}return result;}public static String get(TreeMap<String, Object> map, String url){//1、创建httpClientCloseableHttpClient client = HttpClients.createDefault();//2、封装请求参数List<BasicNameValuePair> list = new ArrayList<>();map.forEach((k,v)->list.add(new BasicNameValuePair(k, v.toString())));//3、转化参数String params ;String result = null;CloseableHttpResponse response = null;try {params = EntityUtils.toString(new UrlEncodedFormEntity(list, Consts.UTF_8));//4、创建HttpGet请求HttpGet httpGet = new HttpGet(url+ "?"+ params);System.out.println("请求URL: "+httpGet);response = client.execute(httpGet);//5、获取实体HttpEntity entity = response.getEntity();//将实体装成字符串result = EntityUtils.toString(entity);} catch (IOException e) {e.printStackTrace();}finally {try {response.close();} catch (IOException e) {e.printStackTrace();}}return result;}

对象转换为json字符串

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;import java.lang.reflect.Type;/*** Json工具类.*/
public class GsonUtils {private static Gson gson = new GsonBuilder().create();public static String toJson(Object value) {return gson.toJson(value);}public static <T> T fromJson(String json, Class<T> classOfT) throws JsonParseException {return gson.fromJson(json, classOfT);}public static <T> T fromJson(String json, Type typeOfT) throws JsonParseException {return (T) gson.fromJson(json, typeOfT);}

post请求

public static void main(String[] args) {User user= new User();user.setName("张三");// 1.转化参数String param = GsonUtils.toJson(user);// 2.发送请求String url = "";String result = HttpUtil.post(url, param);// 3.获取结果System.out.println("响应结果: "+ result);}

get请求

 public static void main(String[] args) {// 1.组装参数TreeMap<String, Object> map = new TreeMap<>();map.put("name", "张三");map.put("id", "1");map.put("idCard", "51090102198801025878");// 2.签名 无签名可以忽略// String businessSign = SignUtil.sign(map, key);map.put("businessSign", "签名字符串");// 3.发送请求String url = "";String result = HttpUtil.get(map, url);// 4.获取结果System.out.println("响应结果: "+ result);}

如果需要签名

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;public class MD5Encoder {private static final String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b","c", "d", "e", "f"};public static String encode(String rawPass, String salt) {String result = null;try {MessageDigest md = MessageDigest.getInstance("md5");// 加密后的字符串result = byteArrayToHexString(md.digest(mergePasswordAndSalt(rawPass, salt).getBytes(StandardCharsets.UTF_8)));} catch (Exception ex) {}return result;}private static String mergePasswordAndSalt(String password, String salt) {if (password == null) {password = "";}if ((salt == null) || "".equals(salt)) {return password;} else {return password + salt;}}/*** 转换字节数组为16进制字串** @param b 字节数组* @return 16进制字串*/private static String byteArrayToHexString(byte[] b) {StringBuffer resultSb = new StringBuffer();for (int i = 0; i < b.length; i++) {resultSb.append(byteToHexString(b[i]));}return resultSb.toString();}private static String byteToHexString(byte b) {int n = b;if (n < 0) {n = 256 + n;}int d1 = n / 16;int d2 = n % 16;return hexDigits[d1] + hexDigits[d2];}

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.thinkgem.jeesite.modules.panelmachine.request.OpenAPIRequest;
import org.springframework.util.StringUtils;import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.UUID;public class SignUtil {public static String signJsonObject(JsonObject jsonObject, String signKey, int floor) {List<String> keys = new ArrayList<>();HashMap<String, String> params = new HashMap<>();for (Map.Entry<String, JsonElement> entity : jsonObject.entrySet()) {String key = entity.getKey();String value = "";if (entity.getValue().isJsonNull()) {continue;}if (entity.getValue().isJsonObject()) {value = signJsonObject(entity.getValue().getAsJsonObject(), signKey, floor + 1);} else if (entity.getValue().isJsonArray()) {List<String> result = new ArrayList<>();entity.getValue().getAsJsonArray().forEach(action -> {if (action.isJsonObject()) {result.add(signJsonObject(action.getAsJsonObject(), signKey, floor + 1));} else if (action.isJsonArray()) {result.add(signJsonObject(action.getAsJsonArray().getAsJsonObject(), signKey, floor + 1));} else {result.add(action.getAsString());}});if (result.size() > 0) {Collections.sort(result);StringBuilder sb = new StringBuilder();result.forEach(action -> {if(StringUtils.hasText(action)) {sb.append(action + "&") ;} ;});sb.deleteCharAt(sb.length() - 1);value = MD5Encoder.encode(sb.toString(), "");}} else {value = entity.getValue().getAsString();}if (StringUtils.isEmpty(value)) {} else {keys.add(key);params.put(key, value);}}if (keys.size() == 0) {return "";}// checkSignCollections.sort(keys);StringBuilder sb = new StringBuilder();keys.forEach(key -> sb.append(key + "=" + params.get(key) + "&"));if (floor == 1 && StringUtils.hasText(signKey)) {sb.append("key=" + signKey);} else {sb.deleteCharAt(sb.length() - 1);}System.out.println("签名前字符串："+ sb.toString());System.out.println("签名结果："+MD5Encoder.encode(sb.toString(), ""));return MD5Encoder.encode(sb.toString(), "");}public static OpenAPIRequest sign(OpenAPIRequest openAPIRequest, String key) {openAPIRequest.setNonce(UUID.randomUUID().toString());openAPIRequest.setBusinessTimestamp(System.currentTimeMillis()+"");openAPIRequest.setBusinessSign(md5Sign(openAPIRequest,key));return openAPIRequest ;}public static OpenAPIRequest sign(OpenAPIRequest openAPIRequest, Map<String, String> params, String key) {openAPIRequest.setNonce(UUID.randomUUID().toString());openAPIRequest.setBusinessTimestamp(System.currentTimeMillis()+"");openAPIRequest.setBusinessSign(md5Sign(openAPIRequest , params, key));return openAPIRequest ;}public static  String md5Sign(OpenAPIRequest request, Map<String, String> params, String key) {JsonObject jsonObject = new JsonParser().parse(new Gson().toJson(request)).getAsJsonObject();params.entrySet().forEach(action -> jsonObject.addProperty(action.getKey() , action.getValue()));return signJsonObject(jsonObject, key,1) ;}private static String md5Sign(OpenAPIRequest request, String key) {JsonObject jsonObject = new JsonParser().parse(new Gson().toJson(request)).getAsJsonObject();jsonObject.remove("image");return signJsonObject(jsonObject, key ,1) ;}public static String sign(TreeMap<String, Object> map, String key) {StringBuilder sb = new StringBuilder();map.forEach((k,v)->{sb.append(k + "=" + v + "&");});sb.append("key=" + key);System.out.println("签名前字符串: "+ sb);String businessSign = MD5Encoder.encode(sb.toString(), "");System.out.println("签名结果: " + businessSign);return businessSign;}

签名调用方式

//可以更改为配置或者写死 
public static final String KEY = "key"; public static void main(String[] args) {
//封装参数
TreeMap<String, Object> map = new TreeMap<>();map.put("name", "张三");map.put("id", "1");map.put("idCard", "51090102198801025878");
// 签名String businessSign = SignUtil.sign(map, key);}