java 发送http请求返回字符串再进行解析（略）

港控/mmm° 2022-08-24 11:41 131阅读 0赞

package taobao.test;
    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.FileWriter;
    import java.io.InputStreamReader;
    import java.io.OutputStreamWriter;
    import java.net.URL;
    import java.net.URLConnection;
    import java.util.Map;
    import java.util.Set;
    
    /**
     * 
     * @author Administrator
     *
     */
    
    public class postUrlgetJson {
    
    	
    	public static String getDataFromURL(String strURL, Map<String, Object> param) throws Exception {
    		URL url = new URL(strURL);
    		URLConnection conn = url.openConnection();
    		conn.setDoOutput(true);
    
    		OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
    		final StringBuilder sb; 
    		if (param != null) {
    			sb = new StringBuilder(param.size() << 4);// 4次方
    			final Set<String> keys = param.keySet();
    			for (final String key : keys) {
    				final Object value = param.get(key);
    				sb.append(key); // 不能包含特殊字符
    				sb.append('=');
    				sb.append(value);
    				sb.append('&');
    			}
    			// 将最后的 '&' 去掉
    			sb.deleteCharAt(sb.length() - 1);
    		}else{
    			sb = new StringBuilder(100 << 4);
    		}
    		writer.write(sb.toString());
    		writer.flush();
    		writer.close();
    
    		InputStreamReader reder = new InputStreamReader(conn.getInputStream(), "utf-8");
    
    		BufferedReader breader = new BufferedReader(reder);
    
    		BufferedWriter w = new BufferedWriter(new FileWriter("d:/1.txt"));//获取内容输出到指定文件
    
    		String content = null;
    		String result = null;
    		while ((content = breader.readLine()) != null) {
    			result += content;
    		}
    		w.write(result);
    		w.flush();
    		w.close();
    		
    		return result;
    
    	}
    	
    	//main方法 
    	public static void main(String[] args) {
    		String strURL = "http://open.taobao.com/index.htm";
    		try {
    			//调用发送请求方法
    			String result = getDataFromURL(strURL, null);
    			//输出url返回内容 如上面的htm页面的源文件 返回结果
    			System.out.println("result:"+result);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    }