java代码使用Get请求或者Post请求获取网络内容

引入的依赖包，也可以去阿里仓库下载 ————>前往阿里云仓库

<dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.7</version><scope>test</scope>
</dependency>
<dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.1.RELEASE</version>
</dependency>

一个Get Post请求的java代码


import org.apache.commons.lang3.StringUtils;
import org.springframework.util.StreamUtils;import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.Map;public class HttpUtil {/*** post请求* @param urlStr* @param param* @param userAgent* @return*/public static String httpPost(String urlStr,String param,String userAgent){try {URL url = new URL(urlStr);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("POST");conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");conn.setReadTimeout(5000);conn.setConnectTimeout(60 * 1000);if(StringUtils.isNotBlank(userAgent)){conn.setRequestProperty("User-Agent",userAgent);}conn.setUseCaches(false);conn.setDoInput(true);conn.setDoOutput(true);BufferedOutputStream out = new BufferedOutputStream(conn.getOutputStream());BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream(),"utf-8"));bw.write(param);bw.flush();bw.close();if (conn.getResponseCode()==200){BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));String tempStr = null;String str = "";while ((tempStr=br.readLine())!=null){str +=tempStr;}br.close();return str;}}catch (Exception e){e.printStackTrace();}return null;}/*** post请求* @param urlStr* @param xmlParam* @return*/public static String httpPost(String urlStr,String xmlParam){return httpPost(urlStr,xmlParam,null);}/*** 调用外部接口，并返回响应结果* @param httpUrl* @param params* @return* @throws Exception*/public static String sendHttpPostRequest(String httpUrl, Map<String, String> params) throws Exception{URL url = new URL(httpUrl);HttpURLConnection conn = (HttpURLConnection)url.openConnection();conn.setRequestMethod("POST");conn.setDoOutput(true);if(params != null && params.size() > 0){StringBuilder sb = new StringBuilder();for(Map.Entry<String, String> entry : params.entrySet()){sb.append("&").append(entry.getKey()).append("=").append(entry.getValue());}conn.getOutputStream().write(sb.substring(1).getBytes("utf-8"));}conn.connect();String responseContent = StreamUtils.copyToString(conn.getInputStream(), Charset.forName("utf-8"));conn.disconnect();return responseContent;}public static String sendHttpGetRequest(String httpUrl, Map<String, String> params) throws Exception{try {if(params != null && params.size() > 0){StringBuilder sb = new StringBuilder();for(Map.Entry<String, String> entry : params.entrySet()){sb.append("&").append(entry.getKey()).append("=").append(entry.getValue());}sb = new StringBuilder(sb.substring(1));if(httpUrl.contains("?")){httpUrl += "&"+sb.toString();}else{httpUrl += "?"+sb.toString();}}URL url = new URL(httpUrl);HttpURLConnection conn = (HttpURLConnection)url.openConnection();conn.setRequestMethod("GET");conn.setDoOutput(true);conn.connect();String responseContent = StreamUtils.copyToString(conn.getInputStream(), Charset.forName("utf-8"));conn.disconnect();return responseContent;} catch (IOException e) {e.printStackTrace();return null;}}//获得网络路径public static InputStream getImageStream(String url) throws Exception{HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();connection.setReadTimeout(5000);connection.setConnectTimeout(5000);connection.setRequestMethod("GET");connection.addRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36");if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {return connection.getInputStream();}else{throw new Exception("响应状态：" + connection.getResponseCode() + "\n" +"响应内容：" + connection.getResponseMessage());}}//判断当前请求是否有效public static boolean sendGetRequestAck(String url) throws Exception{HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();connection.setReadTimeout(5000);connection.setConnectTimeout(5000);connection.setRequestMethod("GET");connection.addRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36");if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {return true;}else{return false;}}//把字节流转换成字节数组public static byte[] toByteArray(InputStream input) {try {ByteArrayOutputStream output = new ByteArrayOutputStream();byte[] buffer = new byte[1024*4];int n = 0;while (-1 != (n = input.read(buffer))) {output.write(buffer, 0, n);}return output.toByteArray();} catch (IOException e) {e.printStackTrace();return null;}}//把字节数组转换成字节流public static InputStream toInputStream(byte[] bytes){return new ByteArrayInputStream(bytes);}//字节流转换字节流public static InputStream toInputStream(InputStream input){return toInputStream(toByteArray(input));}
}

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java代码使用Get请求或者Post请求获取网络内容

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