使用apache 提供的httpclient方式向服务器提交数据-白红宇

使用apache 提供的httpclient方式向服务器提交数据

阅读量：5863 次

发布时间：2019-06-19

本文共 3841 字，大约阅读时间需要 12 分钟。

1、客服端：

其中 utils.java代码如下：

package com.zwh.httpclient;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;public class Utils {	public Utils() {		// TODO Auto-generated constructor stub	}		/**	 * 	 * @param path	 * @param map	 * @param encode	 * @return	 */		public static String sendHttpClientPost(String path,			Map
    
      map, String encode) {		List
     
       list=new ArrayList
      
       ();		for(Map.Entry
       
         entry:map.entrySet()){						list.add(new BasicNameValuePair(entry.getKey(),entry.getValue()));					}		try {			//实现将请求中的参数封装到请求参数中，请求体中			UrlEncodedFormEntity  entity=new UrlEncodedFormEntity(list,encode);			//使用post方式提交			HttpPost httpPost=new HttpPost(path);			httpPost.setEntity(entity);			//指定post方式提交数据			DefaultHttpClient client =new DefaultHttpClient();						HttpResponse httpResponse=client.execute(httpPost);			if(httpResponse.getStatusLine().getStatusCode()==200){				return changeInputStream(httpResponse.getEntity().getContent(),encode);							}					} catch (Exception e) {			// TODO: handle exception		}						return "";	}	/**	 * 	 * @param inputStream	 * @param encode	 * @return	 */	private static String changeInputStream(InputStream inputStream,			String encode) {		// TODO Auto-generated method stub		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();		int len = 0;		byte[] date = new byte[1024];		String result = "";		try {			while ((len = inputStream.read(date)) != -1) {				outputStream.write(date, 0, len);			}			result = new String(outputStream.toByteArray(), encode);						return result;		} catch (IOException e) {			// TODO Auto-generated catch block			e.printStackTrace();		}		return null;	}	public static void main(String[] args) {		String path="http://localhost:8080/httppost/LoginServlet";				Map
        
          params = new HashMap
         
          (); params.put("username", "admin"); params.put("password", "123"); String result=Utils.sendHttpClientPost(path, params, "utf-8"); System.out.println(result); }}

2、服务器端代码如下：

package com.zwh.http;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet {	public void destroy() {		super.destroy(); // Just puts "destroy" string in log		// Put your code here	}	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		this.doPost(request,response);	}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		response.setContentType("text/html;charset=utf-8");		response.setCharacterEncoding("utf-8");		request.setCharacterEncoding("utf-8");				PrintWriter out=response.getWriter();				String username=request.getParameter("username");		String password=request.getParameter("password");		System.out.println("---->username:"+username);		System.out.println("---->password:"+password);				if(username.equals("admin")&&password.equals("123")){			out.println("login is success ! ");		}else{			out.println("login is failure ! ");					}				out.flush();		out.close();		}	public void init() throws ServletException {		// Put your code here	}}

客服端执行结果为：