JAVA发送http get/post请求，调用http接口、方法详解

JAVA发送http get/post请求，调用http接口、方法详解

三个例子 —java发送http get/post请求，调用http接口、方法

例1：使用 HttpClient （commons-httpclient-3.0.jar

jar下载地址：http://xiazai.jb51.net/201904/yuanma/commons-httpclient-3.0.rar

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import org.apache.commons.httpclient.HttpClient;

import org.apache.commons.httpclient.methods.InputStreamRequestEntity;

import org.apache.commons.httpclient.methods.PostMethod;

import org.apache.commons.httpclient.methods.RequestEntity;

public class HttpTool {

/**

* 发送post请求

*

* @author Michael -----CSDN: http://blog.csdn.net/capmiachael

* @param params

* 参数

* @param requestUrl

* 请求地址

* @param authorization

* 授权书

* @return 返回结果

* @throws IOException

*/

public static String sendPost(String params, String requestUrl,

String authorization) throws IOException {

byte[] requestBytes = params.getBytes("utf-8"); // 将参数转为二进制流

HttpClient httpClient = new HttpClient();// 客户端实例化

PostMethod postMethod = new PostMethod(requestUrl);

//设置请求头Authorization

postMethod.setRequestHeader("Authorization", "Basic " + authorization);

// 设置请求头 Content-Type

postMethod.setRequestHeader("Content-Type", "application/json");

InputStream inputStream = new ByteArrayInputStream(requestBytes, 0,

requestBytes.length);

RequestEntity requestEntity = new InputStreamRequestEntity(inputStream,

requestBytes.length, "application/json; charset=utf-8"); // 请求体

postMethod.setRequestEntity(requestEntity);

httpClient.executeMethod(postMethod);// 执行请求

InputStream soapResponseStream = postMethod.getResponseBodyAsStream();// 获取返回的流

byte[] datas = null;

try {

datas = readInputStream(soapResponseStream);// 从输入流中读取数据

} catch (Exception e) {

e.printStackTrace();

}

String result = new String(datas, "UTF-8");// 将二进制流转为String

// 打印返回结果

// System.out.println(result);

return result;

}

/**

* 从输入流中读取数据

*

* @param inStream

* @return

* @throws Exception

*/

public static byte[] readInputStream(InputStream inStream) throws Exception {

ByteArrayOutputStream outStream = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while ((len = inStream.read(buffer)) != -1) {

outStream.write(buffer, 0, len);

}

byte[] data = outStream.toByteArray();

outStream.close();

inStream.close();

return data;

}

}

例2：

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.net.InetSocketAddress;

import java.net.Proxy;

import java.net.URL;

import java.net.URLConnection;

import java.util.List;

import java.util.Map;

/**

* Http请求工具类

* @author snowfigure

* @since 2014-8-24 13:30:56

* @version v1.0.1

*/

public class HttpRequestUtil {

static boolean proxySet = false;

static String proxyHost = "127.0.0.1";

static int proxyPort = 8087;

/**

* 编码

* @param source

* @return

*/

public static String urlEncode(String source,String encode) {

String result = source;

try {

result = java.net.URLEncoder.encode(source,encode);

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

return "0";

}

return result;

}

public static String urlEncodeGBK(String source) {

String result = source;

try {

result = java.net.URLEncoder.encode(source,"GBK");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

return "0";

}

return result;

}

/**

* 发起http请求获取返回结果

* @param req_url 请求地址

* @return

*/

public static String httpRequest(String req_url) {

StringBuffer buffer = new StringBuffer();

try {

URL url = new URL(req_url);

HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();

httpUrlConn.setDoOutput(false);

httpUrlConn.setDoInput(true);

httpUrlConn.setUseCaches(false);

httpUrlConn.setRequestMethod("GET");

httpUrlConn.connect();

// 将返回的输入流转换成字符串

InputStream inputStream = httpUrlConn.getInputStream();

InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");

BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

String str = null;

while ((str = bufferedReader.readLine())http:// != null) {

buffer.append(str);

}

bufferedReader.close();

inputStreamReader.close();

// 释放资源

inputStream.close();

inputStream = null;

httpUrlConn.disconnect();

} catch (Exception e) {

System.out.println(e.getStackTrace());

}

return buffer.toString();

}

/**

* 发送http请求取得返回的输入流

* @param requestUrl 请求地址

* @return InputStream

*/

public static InputStream httpRequestIO(String requestUrl) {

InputStream inputStream = null;

try {

URL url = new URL(requestUrl);

HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();

httpUrlConn.setDoInput(true);

httpUrlConn.setRequestMethod("GET");

httpUrlConn.connect();

// 获得返回的输入流

inputStream = httpUrlConn.getInputStream();

} catch (Exception e) {

e.printStackTrace();

}

return inputStream;

}

/**

* 向指定URL发送GET方法的请求

*

* @param url

* 发送请求的URL

* @param param

* 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。

* @return URL 所代表远程资源的响应结果

*/

public static String sendGet(String url, String param) {

String result = "";

BufferedReader in = null;

try {

String urlNameString = url + "?" + param;

URL realUrl = new URL(urlNameString);

// 打开和URL之间的连接

URLConnection connection = realUrl.openConnection();

// 设置通用的请求属性

connection.setRequestProperty("accept", "*/*");

connection.setRequestProperty("connection", "Keep-Alive");

connection.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

// 建立实际的连接

connection.connect();

// 获取所有响应头字段

Map> map = connection.getHeaderFields();

// 遍历所有的响应头字段

for (String key : map.keySet()) {

System.out.println(key + "--->" + map.get(key));

}

// 定义 BufferedReader输入流来读取URL的响应

in = new BufferedReader(new InputStreamReader(

connection.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result += line;

}

} catch (Exception e) {

System.out.println("发送GET请求出现异常！" + e);

e.printStackTrace();

}

// 使用finally块来关闭输入流

finally {

try {

if (in != null) {

in.close();

}

} catch (Exception e2) {

e2.printStackTrace();

}

}

return result;

}

/**

* 向指定 URL 发送POST方法的请求

*

* @param url

* 发送请求的 URL

* @param param

* 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。

* @param isproxy

* 是否使用代理模式

* @return 所代表远程资源的响应结果

*/

public static String sendPost(String url, String param,boolean isproxy) {

OutputStreamWriter out = null;

BufferedReader in = null;

String result = "";

try {

URL realUrl = new URL(url);

HttpURLConnection conn = null;

if(isproxy){//使用代理模式

@SuppressWarnings("static-access")

Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));

conn = (HttpURLConnection) realUrl.openConnection(proxy);

}else{

conn = (HttpURLConnection) realUrl.openConnection();

}

// 打开和URL之间的连接

// 发送POST请求必须设置如下两行

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setRequestMethod("POST"); // POST方法

// 设置通用的请求属性

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

conn.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

conn.connect();

// 获取URLConnection对象对应的输出流

out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");

// 发送请求参数

out.write(param);

// flush输出流的缓冲

out.flush();

// 定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result += line;

}

} catch (Exception e) {

System.out.println("发送 POST 请求出现异常！"+e);

e.printStackTrace();

}

//使用finally块来关闭输出流、输入流

finally{

try{

if(out!=null){

out.close();

}

if(in!=null){

in.close();

}

}

catch(IOException ex){

ex.printStackTrace();

}

}

return result;

}

public static void main(String[] args) {

//demo:代理访问

String url = "http://api.adf.ly/api.php";

String para = "key=youkeyid&youuid=uid&advert_type=int&domain=adf.ly&url=http://somewebsite.com";

String sr=HttpRequestUtil.sendPost(url,para,true);

System.out.println(sr);

}

}

例3

/**

* 发送Http post请求

*

* @param xmlInfo

* json转化成的字符串

* @param URL

* 请求url

* @return 返回信息

*/

public static String doHttpPost(String xmlInfo, String URL) {

System.out.println("发起的数据:" + xmlInfo);

byte[] xmlData = xmlInfo.getBytes();

InputStream instr = null;

java.io.ByteArrayOutputStream out = null;

try {

URL url = new URL(URL);

URLConnection urlCon = url.openConnection();

urlCon.setDoOutput(true);

urlCon.setDoInput(true);

urlCon.setUseCaches(false);

urlCon.setRequestProperty("content-Type", "application/json");

urlCon.setRequestProperty("charset", "utf-8");

urlCon.setRequestProperty("Content-length",

String.valueOf(xmlData.length));

System.out.println(String.valueOf(xmlData.length));

DataOutputStream printout = new DataOutputStream(

urlCon.getOutputStream());

printout.write(xmlData);

printout.flush();

printout.close();

instr = urlCon.getInputStream();

byte[] bis = IOUtils.toByteArray(instr);

String ResponseString = new String(bis, "UTF-8");

if ((ResponseString == null) || ("".equals(ResponseString.trim()))) {

System.out.println("返回空");

}

System.out.println("返回数据为:" + ResponseString);

return ResponseString;

} catch (Exception e) {

e.printStackTrace();

return "0";

} finally {

try {

out.close();

instr.close();

} catch (Exception ex) {

return "0";

}

}

}

以上所述是给大家介绍的Java发送http get/post请求调用接口/方法详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，会及时回复大家的。在此也非常感谢大家对我们网站的支持！

版权声明：本文内容由网络用户投稿，版权归原作者所有，本站不拥有其著作权，亦不承担相应法律责任。如果您发现本站中有涉嫌抄袭或描述失实的内容，请联系我们jiasou666@gmail.com 处理，核实后本网站将在24小时内删除侵权内容。