刚刚毕业，所以很多不懂。这是我做的一个例子。但是一直报500错误public static String addfriend(String ownerName,String friendName) throws IOException{

String url = https://a1.easemob.com/gzw-dem ... s2%3B

String body = ClientContext.sendPost(url, null);

return body;

}

public static String sendPost(String urlStr, String reqBody) throws IOException {

String token = ClientContext.getToken();

PrintWriter out = null;

BufferedReader in = null;

String result = "";

try {

URL realUrl = new URL(urlStr);

// 打开和URL之间的连接

URLConnection conn = realUrl.openConnection();

// 设置通用的请求属性

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

conn.setRequestProperty("Authorization", "Bearer " + token);

conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

// 发送POST请求必须设置如下两行

conn.setDoOutput(true);

conn.setDoInput(true);

// 获取URLConnection对象对应的输出流

out = new PrintWriter(conn.getOutputStream());

// 发送请求参数

if (reqBody != null) {

out.print(reqBody);

}

// flush输出流的缓冲

out.flush();

// 定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(new InputStreamReader(conn.getInputStream()));

String line;

while ((line = in.readLine()) != null) {

result += line;

}

} catch (Exception e) {

System.out.println("发送 POST 请求出现异常！" + e);

e.printStackTrace();

}

// 使用finally块来关闭输出流、输入流

finally {

try {

if (out != null) {

out.close();

}

if (in != null) {

in.close();

}

} catch (IOException ex) {

ex.printStackTrace();

}

}

return result;

}

报错为：

java.io.IOException: Server returned HTTP response code: 500 for URL: https://a1.easemob.com/gzw-dem ... s/zs2

at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1840)

at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)

at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)

at com.longcom.commmon.ClientContext.sendPost(ClientContext.java:141)

at com.longcom.service.UsersOperation.addfriend(UsersOperation.java:106)

at com.longcom.test.Test.main(Test.java:47)