java发送http的get、post请求

作者: adm 分类: java 发布时间: 2021-06-03 13:59

java发送http的get、post请求

package wzh.Http;

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;

public class HttpRequest {
/**
* 向指定URL发送GET方法的请求
*
* @param url
* 发送请求的URL
* @param param
* 请求参数,请求参数应该是 name1=value1&name2=value2 的形式。
* @return URL 所代表远程资源的响应结果
*/
public static String sendGet(String url, String param) {
String result = "";
BufferedReader in = null;
try {
String urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map<String, List<String>> map = connection.getHeaderFields();
// 遍历所有的响应头字段
for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送GET请求出现异常!" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}

/**
* 向指定 URL 发送POST方法的请求
*
* @param url
* 发送请求的 URL
* @param param
* 请求参数,请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, String param)  {
    try {
        URL httpurl = new URL(url);
        HttpURLConnection httpConn = (HttpURLConnection) httpurl.openConnection();
        httpConn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; "
                + "Windows NT 5.1; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");
        httpConn.setConnectTimeout(8 * 1000);
        httpConn.setReadTimeout(10 * 1000);
        httpConn.setDoOutput(true);
        httpConn.setDoInput(true);
        httpConn.setUseCaches(false);
        httpConn.setRequestMethod("POST");
        httpConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
        httpConn.connect();
        OutputStream outputStream = httpConn.getOutputStream();
        PrintWriter out = new PrintWriter(outputStream);
        out.print(param);
        out.flush();
        out.close();
        InputStream inputStream = httpConn.getInputStream();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
        StringBuffer stringBuffer = new StringBuffer();
        String line = null;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuffer.append(line);
        }
        String resp = stringBuffer.toString();
        // System.out.println(resp);
        if (stringBuffer != null) {
            try {
                bufferedReader.close();
            } catch (IOException var18) {
                var18.printStackTrace();
            }
        }
        if (inputStream != null) {
            try {
                inputStream.close();
            } catch (IOException var17) {
                var17.printStackTrace();
            }
        }
        if (outputStream != null) {
            try {
                outputStream.close();
            } catch (IOException var17) {
                var17.printStackTrace();
            }
        }
        return resp;
    }catch (IOException e) {
        throw new RuntimeException(String.format("url:%s,param:%s,message:%s", url, param, e.getMessage()), e);
    }

public static String sendPostXml(String uri,String xml) {
    try {
        // 创建url资源
        URL url = new URL(uri);
        // 建立http连接
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        // 设置允许输出
        conn.setDoOutput(true);

        conn.setDoInput(true);

        // 设置不用缓存
        conn.setUseCaches(false);
        // 设置传递方式
        conn.setRequestMethod("POST");
        // 设置维持长连接
        conn.setRequestProperty("Connection", "Keep-Alive");
        // 设置文件字符集:
        conn.setRequestProperty("Charset", "UTF-8");
        //转换为字节数组
        byte[] data = xml.getBytes();
        // 设置文件长度
        conn.setRequestProperty("Content-Length", String.valueOf(data.length));
        // 设置文件类型:
        conn.setRequestProperty("contentType", "text/xml");
        // 开始连接请求
        conn.connect();
        OutputStream  out = conn.getOutputStream();
        // 写入请求的字符串
        out.write(data);
        out.flush();
        out.close();

        System.out.println(conn.getResponseCode());

        // 请求返回的状态
        if (conn.getResponseCode() == 200) {
            System.out.println("连接成功");
            // 请求返回的数据
            InputStream in = conn.getInputStream();
            String a = null;
            try {
                byte[] data1 = new byte[in.available()];
                in.read(data1);
                // 转成字符串
                a = new String(data1);
                return a;
            } catch (Exception e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
        } else {
            return  conn.getResponseMessage();
        }

    } catch (Exception e) {

    }
    return "";
}
}

调用方法:

public static void main(String[] args) {
//发送 GET 请求
String s=HttpRequest.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456");
System.out.println(s);

//发送 POST 请求
String sr=HttpRequest.sendPost("http://localhost:6144/Home/RequestPostString", "key=123&v=456");
System.out.println(sr);
}

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