java 模拟浏览器进行get和post请求

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本文详细介绍了如何使用Java进行网络请求，包括GET和POST两种常见方式的实现。通过具体代码示例，展示了如何设置请求头，发送参数，并接收响应结果。适合初学者和需要复习HTTP请求处理的开发者。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;
 
/**
 * Hello world!
 */
class GetPostTest {
    public static String sendGet(String url, String param) {
        String result = "";
        String urlName = url + "?" + param;
        try {
            URL realURL = new URL(urlName);
            URLConnection conn = realURL.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "");
            conn.connect();
            Map<String, List<String>> map = conn.getHeaderFields();
            for (String s : map.keySet()) {
                System.out.println(s + "-->" + map.get(s));
            }
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result += "\n" + line;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
 
    public static String sendPost(String url,String param){
        String result = "";
        try {
            URL realUrl = new URL(url);
            URLConnection conn = realUrl.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "");
            //post设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            PrintWriter out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));
            String line;
            while((line = in.readLine()) != null){
                result +="\n" + line;
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    public static void main(String[] args) throws Exception {
        String sendGet =GetPostTest.sendGet("http://yourUrl","param={name:'tom'}");
        System.out.println(sendGet );
        String sendPost =GetPostTest.sendPost("http://yourUrl","param={name:'tom'}");
        System.out.println(sendPost );
    }
}