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利用HttpUrlConnection发送http请求（实现）

利用HttpUrlConnection使用 

package test;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
/**
  * <p>Title: HttpUtil</p>
  * 描述: 通过HttpURLConnection封装http请求
  * @author:邢延明
  * @date: 2019年8月19日 下午3:52:34
 */
public class HttpUtil {
	static String BOUNDARY = java.util.UUID.randomUUID().toString();
	static String TWO_HYPHENS = "--";
	static String LINE_END = "\r\n";
	/**
	* 方法名: sendGet
	* 描述: 封装get请求
	* @param target
	* @return
	* @throws Exception String
	* 时间: 2019年8月19日 下午5:18:50
	 */
	public static String sendGet( String target) throws Exception {
		String httpresult = null;
		try{
			//1.设置请求的网址
			URL url = new URL(target);
			//2.获取连接
			HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
			//3.设置请求方法
			conn.setRequestMethod("GET");  
			//设置连接超时时间
			conn.setConnectTimeout(1000 * 60);  
			//设置读取超时时间
			conn.setReadTimeout(1000 * 60);
			//允许写出
			conn.setDoOutput(true);  
			//允许读入
			conn.setDoInput(true);
			conn.connect();
			 
			if(conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				InputStream inStream=conn.getInputStream(); 
				//将读入内容转换成字符串
				httpresult = new String(readInputStream(inStream), "UTF-8");
			}
			
		}catch(Exception e){
			throw e;
		}
		
		return httpresult;
	}
	
	/**
	* 方法名: sendPost
	* 描述: 正常post请求
	* @param message
	* @param target
	* @throws Exception String
	* 时间: 2019年8月19日 下午3:52:12
	 */
	public static String sendPost(String message, String target) throws Exception {
		String httpresult = null;
		try{
			//1.设置请求的网址
			URL url = new URL(target);
			//2.获取连接
			HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
			//3.设置请求方法
			conn.setRequestMethod("POST");  
			//设置连接超时时间
			conn.setConnectTimeout(1000 * 60);  
			//设置读取超时时间
			conn.setReadTimeout(1000 * 60);
			//允许写出
			conn.setDoOutput(true);  
			//允许读入
			conn.setDoInput(true);
			conn.connect();
			
			byte[] bypes = message.toString().getBytes("UTF-8");  
			conn.getOutputStream().write(bypes);   
			if(conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				InputStream inStream=conn.getInputStream(); 
				//将读入内容转换成字符串
				httpresult = new String(readInputStream(inStream), "UTF-8");
			}
			
		}catch(Exception e){
			throw e;
		}
		
		return httpresult;
	}
	/**
	* 方法名: sendPost
	* 描述: 发送json数据
	* @param message
	* @param target
	* @return
	* @throws Exception String
	* 时间: 2019年8月19日 下午4:03:24
	 */
	public static String sendPostJson(String message, String target) {
		String httpresult = null;
		try{
			//1.设置请求的网址
			URL url = new URL(target);
			//2.获取连接
			HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
			//3.设置请求方法
			conn.setRequestMethod("POST");  
			//设置连接超时时间
			conn.setConnectTimeout(1000 * 60);  
			//设置读取超时时间
			conn.setReadTimeout(1000 * 60);
			//设置请求头
			conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
			//允许写出
			conn.setDoOutput(true);  
			//允许读入
			conn.setDoInput(true);
			conn.connect();
			
			byte[] bypes = message.toString().getBytes("UTF-8");  
			conn.getOutputStream().write(bypes);   
			if(conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				InputStream inStream=conn.getInputStream(); 
				//将读入内容转换成字符串
				httpresult = new String(readInputStream(inStream), "UTF-8");
			}
			
		}catch(Exception e){
			e.printStackTrace();
		}
		
		return httpresult;
	}
	/**
	* 方法名: sendFile
	* 描述: 表单文件上传,可以自己通过两个循环完成多文件，多参数上传。
	* @param fileName
	* @param target
	* @return String
	* 时间: 2019年8月19日 下午5:19:30
	 */
	public static String sendFile(String fileName, String target) {
		String httpresult = null;
		try{
			//1.设置请求的网址
			URL url = new URL(target);
			//2.获取连接
			HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
			//3.设置请求方法
			conn.setRequestMethod("POST");  
			//设置连接超时时间
			//conn.setConnectTimeout(1000 * 60);  
			//设置读取超时时间
			//conn.setReadTimeout(1000 * 60);
			//设置请求头
			conn.setRequestProperty("Connection", "Keep-Alive");
		    conn.setRequestProperty("Charset", "UTF-8");
		    conn.setRequestProperty("Content-Type","multipart/form-data; BOUNDARY=" + BOUNDARY);
			//允许写出
			conn.setDoOutput(true);  
			//允许读入
			conn.setDoInput(true);
			conn.connect();
			
			File file = new File(fileName);
			//file.
			//此处使用一个循环就可完成多文件的上传
			StringBuffer strBufFile = new StringBuffer();
		    strBufFile.append(LINE_END);
		    strBufFile.append(TWO_HYPHENS);
		    strBufFile.append(BOUNDARY);
		    strBufFile.append(LINE_END);
		    strBufFile.append("Content-Disposition: form-data; name=\"uploadFile\"; filename=\"" + file.getName() + "\"");
		    strBufFile.append(LINE_END);
		    //strBufFile.append("Content-Type: " + "image/*" );
		    strBufFile.append(LINE_END);
		    strBufFile.append("Content-Lenght: "+file.length());
		    strBufFile.append(LINE_END);
		    strBufFile.append(LINE_END);

		    //OutputStream outputStream = conn.getOutputStream();
		    DataOutputStream outputStream = new DataOutputStream(conn.getOutputStream());
		    //此处使用一个循环就可以完成多个文件域的上传.
		    StringBuffer strBufparam = new StringBuffer();
		    strBufparam.append(TWO_HYPHENS);
		    strBufparam.append(BOUNDARY);
		    strBufparam.append(LINE_END);
		    strBufparam.append("Content-Disposition: form-data; name=\"name\"");
		    strBufparam.append(LINE_END);
		    strBufparam.append("Content-Type: " + "text/plain" );
		    strBufparam.append(LINE_END);
		    strBufparam.append("Content-Lenght: "+("1232").length());
		    strBufparam.append(LINE_END);
		    strBufparam.append(LINE_END);
		    strBufparam.append(""+1232);
		    //strBufparam.append(LINE_END);
		    outputStream.write(strBufparam.toString().getBytes());
		    outputStream.write(strBufFile.toString().getBytes());
			
		    FileInputStream fileInputStream = new FileInputStream(file);//把文件封装成一个流
		    int length = -1;
		    byte[] bytes = new byte[1024];
		    while ((length = fileInputStream.read(bytes)) != -1){
		        outputStream.write(bytes,0,length);//写的具体操作
		    }
		    //写入标记结束位
		    byte[] endData = (LINE_END + TWO_HYPHENS + BOUNDARY + TWO_HYPHENS + LINE_END).getBytes();//写结束标记位
		    outputStream.write(endData);
		    outputStream.flush();
		    fileInputStream.close();
		    outputStream.close();  
			//conn.getOutputStream().write(bypes);   
			if(conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				InputStream inStream=conn.getInputStream(); 
				//将读入内容转换成字符串
				httpresult = new String(readInputStream(inStream), "UTF-8");
			}
			
		}catch(Exception e){
			e.printStackTrace();
		}
		
		return httpresult;
	}
	public static void main(String[] args) throws Exception {
		/*String sendPostJson = sendPostJson("{\"subject\":\"CN=社保秘密什么的次数程度, OU=!人力资源和社会保障局420181130110140917, [email protected], L=沈阳, S=辽宁, C=CN\",\"certBody\":\"\",\"sn\":\"\",\"license\":\"10dfa8c6-9a4f-4d84-bffe-7bb5c5f1506c\"}","http://seal.gxaq.com.cn/get/stampByCert");
		System.out.println(123);
		System.out.println(sendPostJson);*/
		/*String sendFile = sendFile("E:/tmp/694.png", "http://192.168.1.150:8080/upload");
		System.out.println(sendFile);*/
		/*String sendGet = sendGet("http://www.baidu.com");
		System.out.println(sendGet);*/
	}
	
	
	
	/**
	* 方法名: readInputStream
	* 描述: 读取输入流中的字符串
	* @param inStream
	* @return 输入流中的字节数组
	* @throws Exception byte[]
	* 时间: 2019年8月19日 下午3:54:10
	 */
	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;    
	}
}
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