模拟http请求工具类

「爱情、让人受尽委屈。」 2022-05-21 07:49 244阅读 0赞

package cartest;  
  
import java.io.BufferedReader;  
import java.io.IOException;  
import java.io.InputStreamReader;  
import java.io.PrintWriter;  
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
  
/\*\*  
 \* 用于模拟HTTP请求中GET/POST方式  
 \* @author landa  
 \*  
 \*/  
public class HttpUtils \{    
    /\*\*  
     \* 发送GET请求  
     \*    
     \* @param url  
     \*            目的地址  
     \* @param parameters  
     \*            请求参数，Map类型。  
     \* @return 远程响应结果  
     \*/    
    public static String sendGet(String url, Map<String, String> parameters) \{  
        String result="";  
        BufferedReader in = null;// 读取响应输入流    
        StringBuffer sb = new StringBuffer();// 存储参数    
        String params = "";// 编码之后的参数  
        try \{  
            // 编码请求参数  
            String full\_url = url;  
            if (parameters.size()==0) \{  
                  
            \} else\{  
                for (String name : parameters.keySet()) \{    
                    sb.append(name).append("=").append(    
                            java.net.URLEncoder.encode(parameters.get(name),    
                                    "UTF-8")).append("&");    
                \}  
                String temp\_params = sb.toString();    
                params = temp\_params.substring(0, temp\_params.length() - 1);    
                full\_url = url + "?" + params;  
            \}      
            System.out.println(full\_url);  
            // 创建URL对象    
            java.net.URL connURL = new java.net.URL(full\_url);    
            // 打开URL连接    
            java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL    
                    .openConnection();    
            // 设置通用属性    
            httpConn.setRequestProperty("Accept", "\*/\*");    
            httpConn.setRequestProperty("Connection", "Keep-Alive");    
            httpConn.setRequestProperty("User-Agent",    
                    "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");    
           
            // 建立实际的连接    
            httpConn.connect();    
           /\* // 响应头部获取    
            Map<String, List<String>> headers = httpConn.getHeaderFields();    
            // 遍历所有的响应头字段    
            for (String key : headers.keySet()) \{    
                System.out.println(key + "\\t：\\t" + headers.get(key));    
            \}  \*/  
            // 定义BufferedReader输入流来读取URL的响应,并设置编码方式    
            in = new BufferedReader(new InputStreamReader(httpConn    
                    .getInputStream(), "UTF-8"));    
            String line;    
            // 读取返回的内容    
            while ((line = in.readLine()) != null) \{    
                result += line;    
            \}    
        \} catch (Exception e) \{  
            e.printStackTrace();  
        \}finally\{  
            try \{    
                if (in != null) \{    
                    in.close();    
                \}    
            \} catch (IOException ex) \{    
                ex.printStackTrace();    
            \}    
        \}  
        return result ;  
    \}    
   
    /\*\*  
     \* 发送POST请求  
     \*    
     \* @param url  
     \*            目的地址  
     \* @param parameters  
     \*            请求参数，Map类型。  
     \* @return 远程响应结果  
     \*/    
    public static String sendPost(String url, Map<String, String> parameters) \{    
        String result = "";// 返回的结果    
        BufferedReader in = null;// 读取响应输入流    
        PrintWriter out = null;    
        StringBuffer sb = new StringBuffer();// 处理请求参数    
        String params = "";// 编码之后的参数    
        try \{    
            // 编码请求参数    
            if (parameters.size() == 0) \{    
                  
            \} else \{    
                for (String name : parameters.keySet()) \{    
                    sb.append(name).append("=").append(    
                            java.net.URLEncoder.encode(parameters.get(name),    
                                    "UTF-8")).append("&");    
                \}    
                String temp\_params = sb.toString();    
                params = temp\_params.substring(0, temp\_params.length() - 1);    
            \}    
            // 创建URL对象    
            java.net.URL connURL = new java.net.URL(url);    
            // 打开URL连接    
            java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL    
                    .openConnection();    
            // 设置通用属性    
            httpConn.setRequestProperty("Accept", "\*/\*");    
            httpConn.setRequestProperty("Connection", "Keep-Alive");    
            httpConn.setRequestProperty("User-Agent",    
                    "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");    
       
            // 设置POST方式    
            httpConn.setDoInput(true);    
            httpConn.setDoOutput(true);    
            // 获取HttpURLConnection对象对应的输出流    
            out = new PrintWriter(httpConn.getOutputStream());    
            // 发送请求参数    
            out.write(params);    
            // flush输出流的缓冲    
            out.flush();    
            // 定义BufferedReader输入流来读取URL的响应，设置编码方式    
            in = new BufferedReader(new InputStreamReader(httpConn    
                    .getInputStream(), "UTF-8"));    
            String line;    
            // 读取返回的内容    
            while ((line = in.readLine()) != null) \{    
                result += line;    
            \}    
        \} catch (Exception e) \{    
            e.printStackTrace();    
        \} finally \{    
            try \{    
                if (out != null) \{    
                    out.close();    
                \}    
                if (in != null) \{    
                    in.close();    
                \}    
            \} catch (IOException ex) \{    
                ex.printStackTrace();    
            \}    
        \}    
        return result;    
    \}    
   
    /\*\*  
     \* 主函数，测试请求  
     \*    
     \* @param args  
     \*/    
    public static void main(String\[\] args) \{    
        Map<String, String> parameters = new HashMap<String, String>();    
        parameters.put("name", "sarin");    
        String result =sendGet("http://www.baidu.com", parameters);  
        System.out.println(result);  
    \}    
\}